JPH0851527A - Image reader - Google Patents

Abstract

PURPOSE:To keep the resolution in the sub scanning direction properly by reading a stripe pattern tilted in the main scanning direction so as to adjust the moving speed of a scanning section in the sub scanning direction corresponding to precise or rough state of an original. CONSTITUTION:A table sheet 1 having a transparent text area 2 and an opaque stripe pattern 5 provided obliquely in the main scanning direction is overlapped on an original 4 and a scanner 10 including an image sensor unit 11 is moved in the sub scanning direction to read the original 4. A stripe pattern 5 is scanned electrooptically in the main scanning direction and a stripe pattern signal is generated. A stripe analysis circuit 15 analyzes the stripe pattern signal to detect a moving quantity of the scanner 10 in the sub scanning direction. Image data are stored in a buffer memory for each main scanning period and a sub scanning direction correction circuit 17 generates correction data corresponding to a relative moving distance in the sub scanning direction from the image data in response to a moving detection signal. Thus, the reading subscanning resolution is increased/decreased depending on a slow/fast moving speed in the sub scanning direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus, and more particularly, by moving a solid-state image sensor such as a CCD linear array that electro-optically scans in a main scanning direction in a sub scanning direction orthogonal to the main scanning direction. The present invention relates to a line scanner type image reading device for reading a target image such as a document.

[0002]

2. Description of the Related Art An image of the orthogonal scanning system, that is, a line scanner system, which reads an image by moving a reading head using a one-dimensional photoelectric conversion element such as a CCD linear array sensor relative to a target image such as a document. Readers are widely used for image data input devices such as fax machines and computers.

In this type of image reading apparatus, in order to reproduce an accurate image, the read head photoelectrically converts the image data for one line in the main scanning direction, which is the main scanning direction, and the relative movement in the sub scanning direction. It is necessary to have a control means for making accurate correspondence with the amount of movement in the direction. As a first example of a conventional image reading device, a line code for positioning which is relatively fixed to an image and moves relative to a reading head is provided as the control means, and the reading movement of the line code is detected by the reading head. There is an image reading / recording device described in JP-A-60-233974.

Referring to FIG. 18A showing the image reading / recording apparatus of the first conventional example in blocks and FIG. 18B showing the cylinder portion of FIG. 18A in detail, these FIG. The image reading / recording apparatus shown in (A) and (B) has a recording cylinder 101 mounted with a photosensitive material 102 and rotating at a constant speed in an arrow direction, and a main scanning feed screw 105 parallel to a rotation axis of the recording cylinder 101. Recording head 10 that moves at a constant speed
4, an input device 110, a memory 109 for storing image data from the input device 110, and a controller 108.
A code cylinder 121 having a line code composed of a plurality of parallel lines which are fixedly arranged coaxially to the cylinder 101 and are inclined at a specific angle φ with respect to the axial direction on the peripheral surface; and a recording head 104 in a direction along the feed screw 124. The code reading head 122 includes a sensor 152 that moves at a constant speed at a constant speed and irradiates the line code with a light beam 151 to receive the reflected light.

This line code is composed of one main line corresponding to one rotation pulse generated once per one rotation of the cylinder 101 and N sub lines corresponding to N pulses generated N times per one rotation. Since the code reading head 122 moves in the direction of the feed screw 124 in synchronization with the rotations of the cylinder 101 and the code cylinder 121 as described above, the one rotation pulse and the N pulse for each one rotation of the code cylinder 121. The generation phase of is gradually advanced in the rotation direction. When the ratio of the feeding speed of the recording head 104 and the feeding speed of the code reading head 122 is n: 1, while the recording head 104 advances a distance L in the axial direction of the cylinder 101 as shown in FIG. The code reading head 122 advances by L / n. Therefore, when the direction perpendicular to the recording direction Y of the combined recording head 104 on the cylinder 101 is X, the angle formed by X and the axial direction of the cylinder 101. The following equation is established between θ and the inclination angle φ of the line code with respect to the axial direction of the code cylinder 121.

Tan φ = ntan θ Therefore, φ = tan ⁻¹ (ntan θ), similarly, the sub-line is also decided accordingly.

The one rotation pulse thus obtained and N
The pulse causes the controller 108 to control the rotation speeds of the recording cylinder 101 and the feed screw 105 to the motor controllers 112 and 111 and the motors 103 and 106.
Control through.

An image reading device disclosed in Japanese Patent Publication No. 3-34713, which is a second example of the conventional image reading device, is a flat plate-shaped device for performing sub-scanning by reciprocating in the sub-scanning direction with respect to the image scanning unit. A document table is provided, and a striped pattern provided at one end of the document table and having a set inclination angle with respect to the main scanning direction is used for generating a reference signal for movement control in the sub scanning direction.

Referring to FIG. 19 showing an external view of a document scanning section which is a main constituent element of the image reading apparatus of the second conventional example, the document scanning section shown in this figure is formed by printing on the lower surface of one end. A flat glass document table 201 including a striped pattern reference mark 205 and a document area 202 on which the original document 204 is placed, a lamp 206 for illuminating the original document 204 and the reference mark 205, a mirror 207, a lens 208 and a 2048 element. An image scanning unit including a linear array type CCD unit 209.

Referring to FIG. 20, which is a perspective view of the document table 201 from the upper surface to the lower surface, the marks 205 are striped patterns inclined by 45 ° with respect to the main scanning direction. A part (128 elements) of the CCD unit is assigned for light detection corresponding to the reference mark 205. The 192 element on the opposite side of the mark 205 is assigned for margin detection.

Referring to FIG. 21, which shows a block diagram of the circuit of the image scanning unit, the image scanning unit includes a timing generator 25 for generating a data clock and a scanning start signal.
1 and an automatic gain control circuit 252 for amplifying data from each element of the CCD unit 209 and supplying analog data.
And a threshold circuit 250 for outputting binary data corresponding to the set threshold level of the analog data, and fringe analysis by receiving the supply of the binary data and outputting a valid video data line signal, a valid data clock and a valid line. A fringe analysis circuit 254 and a gate circuit (G) 25 which gates binary data by a valid video data line signal.
3 and 3.

The operation will be described. First, the original document 204 and the reference mark 205 on the document table 201.
The reflected light from is projected onto 2048 CCD elements of the CCD unit 209 via the mirror 207 and the lens 208. In response to the data clock and the scan start signal from the timing generator 251, the CCD unit 20
9 performs a sequential data read operation from the 0th to 2047th CCD elements, and supplies the read data to the automatic gain control circuit 252. The automatic gain control circuit 252 amplifies this data and supplies analog data, and the threshold circuit 2
Reference numeral 50 is a binary value composed of binary values of a white signal “0” that is equal to or higher than the threshold level and a black signal “1” that is equal to or lower than the threshold level by comparing the sequentially supplied analog data with a set threshold level. Generate value data. The binary data is supplied to the gate circuit 253, and the gate circuit 253 responds to a valid video data line signal, which will be described later, of the binary data, and 128-2 corresponding to the document area 202 and the margin.
The 047th element data is gated and output to the video data line.

On the other hand, the fringe analysis circuit 254 is first generated at the time of detecting the leading edge of a document and a stripe sample-on signal for instructing the operation of the fringe analysis circuit from a control circuit (not shown) composed of an external microprocessor. The first scan line signal indicating the arrival of the scan line of
The 27th element data is analyzed to detect whether the document table 201 and the original document 204 have moved a predetermined distance.

Referring to FIGS. 22A and 22B showing the details of the reference mark 205 and the analysis operation of the fringe analysis circuit 254, the reference mark 205 is a white fringe 205A and a black fringe 2.
05B and the main scanning direction, that is, CC as described above.
It is a striped pattern inclined by 45 ° with respect to the scanning direction of the D unit 209, and includes the left dummy area 241 and the detection area 24.
2 and a right side dummy area 243. Here, the resolution is 8 pixels / mm in the main scanning direction, and therefore,
8 pixels / mm even in the sub-scanning direction, that is, 8 pixel lines / m
Let m be. Therefore, the size of each pixel is 1 / 8m
It is m × 1/8 mm. If the speed in the sub-scanning direction is an appropriate speed, that is, the nominal feed speed, the distance between pixel lines is 1
Maintained at / 8 mm. However, when the speed in the sub-scanning direction becomes lower than the nominal feed speed, the distance between pixel lines becomes 1
/ 8 mm or less, and the pixel lines overlap each other. The fringe analysis circuit 254 sets a detection position DP consisting of a detection window of one pixel size, and when the document table 201 is moved relative to the image scanning unit in the sub-scanning direction, the interval between scanning lines becomes one pixel size, that is, 1/8 mm. Check if it has arrived.

The initial position of the detection position DP can be set at any pixel position within the detection area 242. Here, for convenience of explanation, the pixel position 48 is set.

Referring to FIG. 23, which is a processing flowchart of the second conventional example, following step 271 of setting the initial position of the detection position DP, in the next step 272, black or black is detected at the detection position DP of the pixel position 48. Check to see if a pixel was found. Since the scan lines L1 to L3 in FIG. 22A do not have a black pixel at the pixel position 48, NO is output in this step 272, and the image data corresponding to these scan lines L1 to L3 are discarded, that is, , And is not supplied to the buffer memory (step 273). Detection position DP at scan line L4
Detects a black pixel and produces a fringe detection pulse SD. Here, YES is output in step 272, and step 27
In 3, the current scan line L4 is handled as a new scan line, and the image data of this scan line L4 is supplied to the buffer memory. The acquisition of the image data is performed by gated the gate circuit 253 by the valid video data line signal as described above (step 274). When the black stripe is detected, the detection position DP is shifted to the next pixel position 49 (step 275).

Referring also to FIG. 22B, here, the procedure returns to step 272 again, and the next scanning line L5 is similarly examined with the pixel position 49 as the detection position DP, and the stripe detection pulse is detected by the detection of the black stripe. SD is generated, image data is taken in, and pixel position 5 of detection position SD is detected.
Shift to 0.

If the same operation is performed for the next scanning line L6, the distance between the scanning lines L5 and L6 is narrower than the nominal distance 1/8 mm due to the decrease in the relative movement speed of the document table 201 with respect to the image scanning portion, and therefore detection is performed. No black stripe is detected at the position DP (pixel position 50), and therefore, no stripe detection pulse SD is generated and image data is not captured. For the same reason, the scan line L7 is not loaded with image data. On the scanning line L8, a black stripe is detected at the detection position DP (pixel position 50), and image data is captured by the stripe detection pulse SD and the detection position DP is shifted to the pixel position 51.

As described above, in this image reading apparatus, the image of the scanning line in which the mutual distance reaches the nominal distance of 1/8 mm, following the change in the relative moving speed of the document table 201 with respect to the visual field of the image scanning unit, that is, the CCD unit 209. Capture data.

The detection position DP is gradually shifted to the right, and when it reaches the pixel position 63 at the right end of the detection area 242, it returns to the pixel position 32 at the left end as shown by the positions of the detection position DP of the scanning lines Ln to Ln + 2. To be made.

A third example of the conventional image reading apparatus is a hand scanner type image reading apparatus described in Japanese Patent Laid-Open No. 62-61182, which is a light transmission type in which position information is partially recorded by a bar code or the like. A sheet is placed on an original document, and a hand scanner that reads the original document through a light-transmitting sheet, a detection unit that detects the positional information from the read image information, and a correction coefficient are calculated from the positional information detected by the detection unit. The present invention is provided with a processing device having a calculation means and a conversion means for converting image information by a correction coefficient obtained by the calculation means, and enables accurate image input of a large original by a small sensor by a simple operation.

Referring to FIG. 24, which is a perspective view showing the image reading state of the third conventional image reading apparatus, this image reading apparatus is similar to the second conventional image reading apparatus in the original 301.
A light-transmitting sheet 302 in which position information is recorded in the form of a bar code on both ends of the transparent sheet, a hand scanner 303 having a built-in sensor for obtaining image information, and a processing device 304 for processing the image information. .

The operation will be described. First, the manuscript 30.
The light transmission type sheet 302 is overlaid on the sheet 1, and then the hand scanner 303 is pressed against the light transmission type sheet 302 for scanning.
The image information on the original 301 and the position information on the light-transmissive sheet 302 are read by a sensor built in the hand scanner 303 and sent to the processing device 304.

Referring to FIG. 25 showing the concept of image information read by the hand scanner 303, the hand scanner 303 is moved in the direction of arrow X on the original 301 and the light transmission type sheet 302 as shown in FIG. By scanning, the image information including the image information portions 305 and 306 at both end portions of the light transmissive sheet 302 can be read as shown in FIG. This image information is processed by the processor 304.
The position information is detected from these image information portions 305 and 306. The position information detected from each of the image information portions 305 and 306 is used as P1 and P2, respectively, and the light transmission type sheet 3
If the interval between the left and right position information recorded on 02 is l, the scanning tilt angle θ of the hand scanner 303 is expressed by the following equation.

Θ = tan ^-1 {(P2-P1) / 1} The processing unit 304 performs this calculation to obtain the angle θ, and performs conversion scanning in which the image information read by the above scanning is tilted by the angle θ. By this conversion scan, FIG.
As shown in (C), the image information input by the tilted scanning as shown in FIGS. (A) and (B) is also restored to the original image information. By repeating this input several times, the original 301
The image information of can be read.

A fourth example of the conventional image reading device, a hand scanner type image reading device described in Japanese Patent Publication No. 64-55053, is located at a position arranged on a page containing printed text or other information. Scan across this page through a light-transmissive sheet containing identification marks. The position identification mark is printed across the light transmissive sheet in a different color than the information on the page, while the information on the page is printed in black, for example. Thus, the second sensor, which is sensitive to the second color or black, while the position sensor, which is sensitive to the color of the identification mark, measures the position of the image reading device associated with that page. Reads the desired information from the page.

Referring to FIG. 26A showing a block diagram of a fourth conventional image reading apparatus, a hand scanner 314 including a line sensor 316 and an optical mouse mechanism 319 for scanning a book to be read, and an optical character recognition unit. (OC
RU) 322, a storage unit 323 including a RAM, and a computer 324.

FIG. 26 showing the bottom of the hand scanner 314.
Referring to (B), the hand scanner 314 includes a line sensor 316 composed of a CCD or the like similar to the above-described conventional second and third image reading devices, and an optical mouse mechanism 31.
9 and the light source 321 of the optical mouse mechanism 319.

The hand scanner 314 is used as the light transmission sheet 31.
Referring to FIG. 26C showing scanning a predetermined page of the book 310 to be read via 8, the book 310 shown in this figure includes a page 311 on which the text 312 to be read is printed.

The light transmission sheet 318 has, for example, a set of red horizontal lines at equal intervals and a set of green vertical lines at equal intervals. When the hand scanner 314 crosses the green and red lines, the sensor in the mouse mechanism 319 senses. The number of lines traversed during the read scan is then added, and the image reading device 314 with respect to the light transmissive sheet 318.
Measure the position of. The light source 321 at the bottom of the hand scanner 314 alternately emits red and green light, and the mouse mechanism 319
Allows the red and green lines to be detected separately.

The operation will be described with reference to FIGS. 26A, 26B and 26C.
The text 312 above is sensed and in response generates electrical signals and sends them to the OCRU 322. Further, the OCRU 322 receives a signal indicating the position of the hand scanner 314 from the optical mouse mechanism 319. CORU
322 implements any of a number of optical character recognition algorithms to identify the character being scanned. OCRU32
When 2 receives not only a signal indicating the presence of printing at a specific point on page 311, but also information indicating the position of that point, this information is used to form a bitmap in storage unit 322.

Because hand scanner 314 is a small device, it may scan information on page 311 while tilting at an angle to text 312. Then, as compared with the case where the hand scanner 314 is held at the correct angle such that the line sensor 316 is vertically aligned with respect to the text 312, the position of the specific information of the text 312 provided at the end of the line sensor 316 is reduced. It will be perceived with a shift depending on the angle. As a result,
The computer 324 stores the incorrect bitmap in the storage unit 322.

In the fourth conventional image reading apparatus,
Instead of the hand scanner 314 for detecting the tilt of the hand scanner, a hand scanner 314A whose bottom portion is shown in FIG. 26D can be used. Referring to FIG. 26D, the hand scanner 314A includes a line sensor 316, an optical mouse mechanism 319, a light source 321, a second mouse information 320, and a second light source 322. Information indicating the inclination of the scanner 314A is added to the computer 324.

Mouse mechanism 319 and mouse mechanism 320
Gives an electric pulse indicating the movement of the light transmission sheet 318 every time it crosses the position identification line. in this way,
Computer 324 tracks the position of mouse mechanisms 319 and 320, resulting in hand scanner 314A.
Track the holding angle of. In this way, the line sensor 31
When 6 outputs a signal indicating the light received by the photoelectric conversion element, computer 324 more accurately calculates which bitmap position the signal corresponds to.

[0035]

The above-described conventional image reading apparatus moves because the resolution of the original reading in the sub-scanning direction is constant even if the relative moving speed of the original in the sub-scanning direction changes. There is a drawback in that the original cannot be read if the speed is increased above a certain limit value. Further, there is a drawback that the read image quality is not improved even if the moving speed is reduced.

Further, there is a drawback in that the moving direction in the sub-scanning direction is one direction, and reading is impossible in the opposite direction.

Further, the conventional moving speed detecting means using the striped pattern is large and complicated, and it is difficult to apply it to a small image reading apparatus such as a hand scanner.

Further, the light transmission sheet in which the position information of the conventional third and fourth image reading devices of the hand scanner type is stored uses a bar code or a highly accurate scale as the position information, and the detection accuracy is high. There is a drawback that the light-transmitting sheet is expensive in order to secure detection accuracy if it is rough.

The object of the present invention is to eliminate the above-mentioned drawbacks of the conventional image reading apparatus and to adjust the moving speed of the scanning unit in the sub-scanning direction in accordance with the fineness of the original so that the scanning unit in the sub-scanning direction can be adjusted. It is an object to provide at low cost an image reading apparatus that can appropriately retain the resolution and can reverse the moving direction of the sub-scan.

[0040]

In order to achieve the above object, a first image reading apparatus of the present invention uses a plurality of photoelectric conversion elements arranged in a linear array so that an original is arranged along the direction of the linear array. Electro-optical conversion in which an image of a document is converted into an image data signal by scanning electro-optically in a main scanning direction at a predetermined main scanning period, and is moved with respect to the document in a sub-scanning direction orthogonal to the main scanning direction. A scanning unit including the device, and a transparent original area which is superposed on the original and allows the original to be seen through,
A table sheet having a pattern area which is arranged parallel to one side of the original area in the sub-scanning direction and has a stripe pattern of black and white stripes having a predetermined inclination and width with respect to the main scanning direction. A pattern signal generating means for electronically scanning the striped pattern in the main scanning direction to generate a pattern signal having a predetermined resolution corresponding to the striped pattern, and in response to the supply of the pattern signal,
A movement detecting unit that detects that the striped pattern has moved in the main scanning direction by a distance corresponding to the relative movement of the scanning unit with respect to the document in the sub scanning direction by a predetermined distance, and a movement detecting unit. A storage control unit that stores an image data signal in a buffer memory for each main scanning cycle, and a sub-scan of the scanning unit from the image data signal stored in the buffer memory in response to a movement detection signal output from the movement detection unit. Correction data generation means for generating correction data corresponding to the relative movement distance in the direction.

A second image reading apparatus of the present invention is an electro-optical device that uses a plurality of photoelectric conversion elements arranged in a linear array to electro-optically scan an original in a main scanning direction along the linear array at a predetermined main scanning period. Scans the document to convert the image of the document into image data signals, and moves the document in the sub-scanning direction orthogonal to the main scanning direction. A striped pattern consisting of a transparent original area for see-through and black and white stripes arranged parallel to one side of the original area in the sub-scanning direction and having a predetermined inclination and width with respect to the main scanning direction. A table sheet having a pattern area composed of a pattern, and a pattern signal for electro-optically scanning the striped pattern in the main scanning direction to generate a pattern signal having a predetermined resolution corresponding to the striped pattern. In response to the forming means and the supply of the pattern signal, it is possible to detect that the striped pattern has moved in the main scanning direction by a distance corresponding to the relative movement of the scanning unit with respect to the document by a predetermined distance in the sub scanning direction. A movement detection unit that detects the movement, generates a movement detection signal, and generates, as sub-scanning data, the number of main scanning lines of the image data included in the relative movement range of the scanning unit in the sub-scanning direction for a predetermined distance, A buffer memory that stores an image data signal and sub-scanning data for each main scanning cycle is provided.

A third image reading apparatus of the present invention is an electro-optical device which uses a plurality of photoelectric conversion elements arranged in a linear array to electro-optically scan an original in a main scanning direction along the linear array at a predetermined main scanning period. Scans the document to convert the image of the document into image data signals, and moves the document in the sub-scanning direction orthogonal to the main scanning direction. A transparent original area for seeing through, and black and white stripes arranged parallel to at least one side of the original area in the sub-scanning direction and having a predetermined inclination and width with respect to the main scanning direction. 1
A striped pattern, and a table sheet having a pattern region including at least two second striped patterns each of which is composed of black and white stripes having a predetermined width and is parallel to the sub-scanning direction; A pattern signal generating unit that electro-optically scans the second striped pattern in the main scanning direction to generate a pattern signal having a predetermined resolution corresponding to the first and second striped patterns, and a pattern signal. Detecting that the first striped pattern has moved in the main scanning direction by a distance corresponding to the relative movement of the scanning unit with respect to the document by a predetermined distance in the sub scanning direction in response to the supply of
First movement detection means for generating a first movement detection signal;
In response to the supply of the pattern signal, when the movement of the scanning unit deviates from the sub-scanning direction and the relative movement with respect to the document occurs in the main scanning direction by a predetermined distance or more, the second striped pattern in the main scanning direction. Second movement detection means for detecting a corresponding movement of the pattern to generate a second movement detection signal, and a pattern spacing between the plurality of second striped patterns in response to the supply of the pattern signal. Is detected to detect the inclination of the linear array with respect to the main scanning direction to generate an inclination signal, storage control means for storing an image data signal in a buffer memory for each main scanning cycle, and first and second Correction data generating means for generating correction data corresponding to the relative movement distances in the sub-scanning direction and the main scanning direction from the image data signal stored in the buffer memory in response to the movement detection signal of 2.

A fourth image reading apparatus of the present invention is an electro-optical device which uses a plurality of photoelectric conversion elements arranged in a linear array to scan an original in a main scanning direction along the linear array at a predetermined main scanning period. Scans the document to convert the image of the document into image data signals, and moves the document in the sub-scanning direction orthogonal to the main scanning direction. A transparent original area for seeing through, and at least one first striped pattern formed of black and white stripes arranged in the original area and having a predetermined inclination and width with respect to the main scanning direction, A table sheet having a pattern area including black and white striped patterns having a predetermined width and including at least two second striped patterns parallel to the sub-scanning direction;
Pattern signal generating means for electro-optically scanning the first and second striped patterns in the main scanning direction to generate pattern signals having a predetermined resolution corresponding to the first and second striped patterns; In response to the supply of the pattern signal, it is possible to confirm that the first striped pattern has moved in the main scanning direction by a distance corresponding to the relative movement of the scanning unit with respect to the document by a predetermined distance in the sub scanning direction. A predetermined distance in the main scanning direction in which the movement of the scanning unit is deviated from the sub-scanning direction in response to the supply of the pattern signal and the first movement detecting means for detecting and generating the first movement detection signal. When the relative movement with respect to the document occurs as described above, the second movement detection means for detecting the corresponding movement of the second striped pattern in the main scanning direction and generating the second movement detection signal, and the pattern signal. Multiple in response to supply of The inclination between the second striped patterns is measured to detect the inclination of the linear array with respect to the main scanning direction to generate an inclination signal, and the image data signal is stored in the buffer memory at each main scanning cycle. Storage control means and correction data generation for generating correction data corresponding to relative movement distances in the sub-scanning direction and the main scanning direction from image data signals stored in the buffer memory in response to the first and second movement detection signals. And means.

A fifth image reading apparatus of the present invention is an electro-optical device which uses a plurality of photoelectric conversion elements arranged in a linear array to scan an original in a main scanning direction along the direction of the linear array at a predetermined main scanning period. Scans the document to convert the image of the document into image data signals, and moves the document in the sub-scanning direction orthogonal to the main scanning direction. A transparent original area for seeing through, and at least two first striped patterns, which are arranged in the original area and are composed of black and white stripes having a predetermined inclination and width with respect to the main scanning direction, A table sheet having a pattern area including black and white striped patterns having a predetermined width and including at least one second striped pattern parallel to the sub-scanning direction;
Pattern signal generating means for electro-optically scanning the first and second striped patterns in the main scanning direction to generate pattern signals having a predetermined resolution corresponding to the first and second striped patterns; In response to the supply of the pattern signal, it is possible to confirm that the first striped pattern has moved in the main scanning direction by a distance corresponding to the relative movement of the scanning unit with respect to the document by a predetermined distance in the sub scanning direction. A predetermined distance in the main scanning direction in which the movement of the scanning unit deviates from the sub-scanning direction in response to the supply of the pattern signal and the first movement detecting means for detecting and generating the first movement detection signal. When the relative movement with respect to the document occurs as described above, the second movement detection means for detecting the corresponding movement of the second striped pattern in the main scanning direction and generating the second movement detection signal, and the pattern signal. In response to the supply of By measuring the spacing between the stripe pattern cross detecting the inclination of the linear array with respect to the main scanning direction,
Inclination detection means for generating an inclination signal, storage control means for storing an image data signal in a buffer memory for each main scanning cycle, and image data stored in the buffer memory in response to the first and second movement detection signals. Correction data generating means for generating correction data corresponding to the relative movement distances in the sub-scanning direction and the main scanning direction from the signal.

[0045]

Embodiments of the present invention will now be described with reference to the drawings.

Referring to FIG. 1A showing the external appearance of the first embodiment of the image reading apparatus of the present invention, the image reading apparatus shown in this figure has a table sheet 1 superposed on an original 4 to be read. And a hand-type scanner 10 for scanning the table sheet 1.

The table sheet 1 has a transparent document area 2 formed of a transparent plastic film having a thickness of 50 to 75 μm, and a pattern area 5 having an oblique stripe pattern.
It has black invalid areas 6 at both ends.

Referring to FIG. 1B, the scanner 10
Is an image sensor unit 11 including a linear array type CCD in which an LED light source for illuminating the original 4 and the pattern area 5 and 1728 photoelectric conversion elements (hereinafter referred to as elements) are linearly arranged, and a lens system, and an image sensor. The AGC circuit 12 that controls the gain in response to the magnitude of the output signal of each element of the unit 11, the black reference and the white reference in advance, and the correction value for each element is calculated to calculate the illuminance variation due to the LED light source and the sensitivity of the element. A black-and-white correction circuit 13 that corrects variations and converts the output signal of the AGC circuit 12 from analog to digital, and a black-and-white correction circuit 13 by a comparator circuit.
A binarization circuit 14 which binarizes the digitized image data from and outputs the binarized image data, and based on the binarized image data corresponding to the pattern area 5, the amount of movement in the main scanning direction to the sub scanning direction of the scanner 10. The fringe analysis circuit 15 which calculates the amount of movement of
And a buffer memory 16 for temporarily storing the binary image data corresponding to the document area 2, and an image sensor signal in contact with a constant number of scanning lines per unit length in the sub-scanning direction in response to the calculation result of the fringe analysis circuit 15. A sub-scanning correction circuit 17 and a timing generation circuit 18 for converting read data by sub-scanning are provided.

Referring to FIG. 2, which is a perspective view of the table sheet 1 from the upper surface to the lower surface, the pattern of the pattern area 5 is in the main scanning direction, that is, in the direction of the CCD array of the image sensor unit 11 of the scanner 10. It is a striped pattern composed of black stripes 5A and white stripes 5B inclined by about 30 °. Of the 1728 elements of the CCD, 128 elements from the left end are assigned for photodetection corresponding to the pattern area 5. The remaining 1600 of the above CCD elements
The elements are assigned to read the original 4 through the document area 2.

The pattern area 5 has a left dummy area 21, a detection area 22 and a right dummy area 23.
The 28th to 0th to 31st elements and the 96th to 127th elements are arranged in the left and right dummy regions 21 and 23, respectively.
~ The 95th element is assigned to each of the detection regions 22.

Next, the operation of the present embodiment will be described with reference to FIGS. 10 and 11. First, the reflected light of the image of the original 4 which has passed through the table sheet 1 and the pattern area 5 is tilted by about 30 °. The reflected light from the striped pattern is received by the image sensor unit 11 and projected onto each of 1728 via the lens system. In response to the data clock pulse and the scan start signal from the timing generation circuit 18, the image sensor unit 11 performs the sequential data read operation of the 0th to 1727th photoelectric conversion elements and outputs the analog read data signal to the AGC circuit. 1
Supply to 2. The read data signal amplified by the AGC circuit 12 is sequentially corrected by the black-and-white correction circuit 13 for the illuminance variation of the LED light source and the element sensitivity variation, and is analog-digital converted and supplied to the binarization circuit 14. The binarization circuit 14 compares the supplied digital signal with a set threshold value, and outputs a black signal "1" corresponding to the threshold value or more.
And binary data consisting of a white signal "0" corresponding to a threshold value or less is generated. As a result, the 1728 digital data signals are sequentially converted into binary data.

160 of the document area 2 of the above binary data
The data for 0 pixels is stored in the buffer memory 16.
Data of 128 pixels of the pattern area 5 among the binary data is supplied to the fringe analysis circuit 15, and the fringe analysis circuit 1
Reference numeral 5 analyzes the data for 128 pixels to generate a sub-scanning timing pulse SD, which is supplied to the sub-scanning correction circuit 17. The sub-scanning correction circuit 17 uses the sub-scanning timing pulse S.
Each time D is supplied, the binary data stored in the buffer memory 16 during the period from the previous sub-scanning timing pulse to the current sub-scanning timing pulse is read, and the binary data is read as an image scan line (hereinafter referred to as a scan line). (Referred to)), a plurality of scanning lines are averaged for each pixel. On the other hand, in the period for one scanning line of binary data in the buffer memory 16, the sub-scanning timing pulse S
If a plurality of Ds are generated, 2 of the scanning lines in the vicinity
Data corresponding to each sub-scanning timing pulse SD is estimated from the value data. As a result, the corrected binary data is output from the sub-scanning correction circuit 17 for each sub-scanning timing pulse SD.

Next, the details of the stripe pattern and the operation timing of the stripe analysis circuit 15 will be described with reference to FIGS.

The resolution of the image reading apparatus of this embodiment is 8 pixels / mm in the main scanning direction and 8 scanning lines / mm in the sub-scanning direction, as in the second conventional image reading apparatus described above.
Suppose The field of view of each element of the image sensor unit 11 is one pixel, that is, 1/8 mm × 1/8 mm.
Is.

3 to 5 show main scanning lines L1 to L.
21 shows the movement of the elements of the image sensor unit 11 based on the relative movement of the scanner 10 and the table sheet 1 in the direction 21. The element data read sampling operation which is the main scanning is performed at a constant sampling speed for each scanning start signal. Repeated. Here, if the moving speed of the scanner 10 in the sub-scanning direction orthogonal to the main scanning direction is maintained at a constant speed synchronized with the sampling, the main scanning is performed as shown in the scan lines L1 to L5. The process is repeated at regular intervals every 1/8 mm in the sub-scanning direction. Scan lines L1 to L21 in the drawing indicate sub-scan positions on the table sheet 1 at the start of the scan lines read by the scanner 10. That is, the scan of the scan line Ln is performed at the position between the n-th scan line Ln and the next scan line Ln + 1 by the movement in the sub-scanning direction. On the other hand, every time the sub-scanning timing pulse SD is generated, that is, the scanner 1
Every time 0 moves by 1/8 mm in the sub-scanning direction, the corrected binary data of the read scanning lines l _{1 to} l ₂₂ is output. Therefore, the scan lines L2-L3, L3-L4, L4-L5
The moving speed in the sub-scanning direction between each of them is synchronized with the reading sampling speed, and the moving amount is 1/8 mm in all, and the scanning of each scanning line L2, L3, L4 is executed between them, and the reading scanning is performed. The lines l ₁ , l ₂ and l ₃ are output. When the moving speed of the scanner 10 in the sub-scanning direction becomes lower than the reading sampling speed, the scanning lines L5 to
The movement amount in the sub-scanning direction is shorter than 1/8 mm like L9. Since the amount of movement in the sub-scanning direction between the scanning lines L5 to L7 and L7 to L9 is 1/8 mm, the scanning lines L5 to L5
The scanning of the scanning lines L5 and L6 is executed at the position of L7,
The reading scan line l ₄ obtained by averaging the two lines for each pixel is performed, and the scan lines L7 and L8 are scanned at the positions of the scan lines L7 to L9, and the average of the two lines for each pixel is obtained. The read scanning line l ₅ is output.

On the contrary, when the moving speed of the scanner 10 becomes higher than the sampling speed, the main scanning is repeated at intervals longer than ⅛ mm like the scanning lines L10 to L13. Here, scan lines L10 and L11, L11 and L
The distance between 12, L12 and L13 is 2/8 mm. Accordingly readout scanning lines of the scanning line L10 is l _7, l _8, readout scanning lines of the scanning line L11 is l
₉ , l ₁₀ and the scanning scanning line of scanning line 12 are l ₁₁ , l
₁₂ are output respectively.

In order to detect the moving distance in every 1/8 mm which is the nominal scanning line interval, the stripe pattern of the pattern area 5 is tilted by about 30 ° with respect to the main scanning direction as described above.
The detection position DP is set by the fringe analysis circuit 15. The fringe analysis circuit 15 checks whether or not the interval between the scanning lines has reached 1/8 mm in response to the relative movement of the scanner 10, and generates the sub-scanning timing pulse SD. The detection position DP is a detection window corresponding to the size of one pixel, that is, 1/8 mm. The initial position of the detection position DP can be set to any pixel position within the detection area 22. For convenience of explanation, here,
The detection position DP is set to the pixel position 50.

Referring also to FIG. 7 which is an operation flowchart of this image reading apparatus, the above-mentioned initial setting operation is shown by step S41. Next, it is checked whether or not a black stripe, that is, a black pixel is detected at this detection position DP (step S42). Referring to FIG. 12, the scan line L1 does not have a black pixel at the detection position corresponding to the pixel position 50. In step S42, the output is NO, and in step S43, the image data of the scanning line L1 is taken into the buffer memory 16. At the scanning line L2, the detection position DP detects a black pixel. This state is indicated by the YES output in step S42. In step S44, the image data of the scanning line L2 is captured in the buffer memory 16, one sub-scanning timing pulse SD is generated, and step S4
At 5, the detection position DP is shifted to the pixel position 52 on the right by two pixels. The operation is returned to step S42, and the black pixel on the scan line L3 is detected at a new detection position, that is, the pixel position 52.
Is detected at. This result YE
Since it is S, the process proceeds to step S44, the image data of the scanning line L3 is taken into the buffer memory 16, one sub-scanning timing pulse SD is generated, and the next step S44.
At 45, the detection position DP is shifted by 2 pixels to the pixel position 54 on the right side.

Similarly, steps S42, S44 and S45 are repeated for the scanning line L4, and the image data is taken into the buffer memory 16, the sub-scanning timing SD is generated and the detection position DP is shifted to the pixel position 56. . In the next scanning line L5, no black pixel is detected at the pixel position 56 of the detection position DP, so step S
In step 43, when the image data of the scanning line L5 is taken into the buffer memory 16, the process returns to step S42. Similarly, the scan lines L6, L7, L8, and L9 are scanned.

Next, in the scan of the scan line L10,
In step S42, it is checked whether or not a black pixel on the scanning line L10 is detected at the pixel position 62 of the detection position DP. Although the result is YES, a black pixel is also detected at the pixel position 63 one pixel to the right. Therefore, in the next step S44, the image data is stored in the buffer memory 1
Two sub-scanning timing pulses SD are taken in 6 and generated. That is, when N black pixels are detected on the right side of the detection position DP corresponding pixel, the sub-scanning timing pulse SD is 1+.
N pieces are generated. Similarly, sub-scanning timing pulse SD
Is two in the scan lines L11, L12, L18 and L19 and 1 in the scan lines L13, L14 and L20.
0 in the scanning lines L15 and L17, and 3 in the scanning line L16.

Table 1 shows the scan lines L1 to L20 of FIGS.
3 is a table showing the relationship among the scanning of, the number of sub-scanning timing pulses, the reading scanning line and the correction data of the reading scanning line.

[0062]

[Table 1] Every time the sub-scanning timing pulse SD is generated, the corrected binary data of the read scanning lines l _{1 to} l ₂₂ is output. L
When the amount of movement in the sub-scanning direction from the start of scanning to the start of the next scanning is small as in the case of scanning 5, 5, SD is not output in the scan of L5, and one SD is output in the scan of L6. That is, the movement amount in the sub-scanning direction becomes 1/8 mm in the scanning of L5 and L6. Therefore, the correction data of the reading scanning line l ₄ is the image signal DATA (L5) of the scanning of L5 and L
The average of the image signals DATA (L6) of 6 scans, that is,
It becomes {DATA (L5) + DATA (L6)} / 2.

On the other hand, when the amount of movement in the sub-scanning direction from the start of scanning to the start of the next scanning is large as in the scanning of L10, two SDs are output in the scanning of L10. That is, L1
The amount of movement in the sub-scanning direction in 0 scanning is 2/8 mm.
Therefore, the correction data of the read scanning lines l ₇ and l ₈ is the same for both lines, and the image signal DATA (L1
0).

In the case of scanning L15 and L16, SD is not output in the scanning of L15, but three SDs are output in the scanning of L16. Therefore, the correction data of the reading scan line l ₁₅ is (DATA (L15) + DATA (L16)) /
2. The correction data of the read scanning lines l ₁₆ and l ₁₇ is the same for both lines and is DATA (L16).

Table 2 shows image signals corresponding to the read scan lines l _{1 to} l ₂₂ . However, the detection position D is not
Since the black pixel is detected by P,
That is, the read scan line l _{2 and the} subsequent lines are used as valid data.

[0066]

[Table 2] The read image signals DATA (L1) to DATA (L20) of the scanning lines L1 to L20 are written in the buffer memory 16, and the sub-scanning correction circuit 17 sets the sub-scanning lines according to the sub-scanning timing pulse SD from the fringe analysis circuit 15. l ₁ ~
The image signal corresponding to l ₂₂ is calculated from Table 2, and the corrected binary data is output together with the enable signal indicating the image signal effective section.

In the fringe analysis circuit 15, the detection position DP is shifted by 2 pixels to the right every time one sub-scanning timing pulse SD is output, and the pixel position 94 at the right end of the detection region 22 (the pixel position at the right end is an odd number). Therefore, when it reaches the detection position candidate disqualified), the detection position DP is returned to the pixel position 32 at the left end of the detection area 22. This return operation is shown by the detection positions DP of the scanning lines Ln, Ln + 1, Ln + 2 in FIG.

Next, the image reading operation when the scanner 10 is moved in the reverse direction opposite to the forward direction indicated by the arrow in FIG. 1 to scan the original will be described.

Scanner 1 in scan lines L1 to L9
Referring to FIG. 8 showing the movement of the field of view of the elements of the image sensor unit 11 based on the relative movement of 0 and the table sheet 1 in the opposite direction, the detection position DP is set by the fringe analysis circuit 15 as in FIG. The fringe analysis circuit 15 corresponds to the relative movement of the scanner 10, and the interval between scanning lines is 1
It is checked whether or not it has reached / 8 mm, and the sub-scanning timing pulse SD is generated.

When the scanner 10 is stopped before moving the original 4 in the sub-scanning direction and the position corresponding to the scanning line L1A of the original 4 is read by main scanning, the scanning line L1A has black pixels at pixel positions 45 to 60. . Therefore, the detection position DP
That is, the pixel positions 43 and 62 are used to identify whether the initial position of the detection window is the reverse direction of the movement of the scanner 10.
Set in two places. The scanner 10 is moved in the opposite direction to start scanning the original 4. In the scanning line L2A, the detection position DP detects a black pixel at the pixel position 43. Since the moving direction of the scanner 10 is determined by this, only one detection position DP is set thereafter, and the pixel position 41 on the left side by two pixels is set.
Is shifted to. After that, the document 4 is scanned similarly to the case of the forward direction, and the image data of the scanning lines L1A to L9A is taken into the buffer memory 16. However, when reading image data from the buffer memory 16,
The reading order in the scan line is performed in the reverse order of the reading order.

Referring to FIG. 9, FIG. 9A shows the positional relationship between the scanning lines L1, L2 and L3 when the scanner 10 is moved in the forward direction to scan the original. The image data of the scanning lines L1, L2, L3 ... Are taken into the buffer memory 16 in the order from left to right for each scanning line as shown in FIG. 9B, and as shown in FIG. 9C. Similar to the time, each data is read from the buffer memory 16 in the order from left to right. On the other hand, FIG. 9D shows the scanner 10 in the reverse direction.
Line L1 for moving the document to scan the document 4
The positional relationship of A, L2A, and L3A is shown. The image data of these scanning lines L1A, L2A, L3A ... Are taken into the buffer memory 16 in the order from left to right for each scanning line as shown in FIG. 9 (E), and as shown in FIG. 9 (F). On the contrary to the time of loading, each data is buffer memory 1 in order from right to left.
6 is read. As a result, the scanner directions in FIGS. 9D and 9F are the same, and correct image data is reproduced.

FIG. 1 is a block diagram of the second embodiment of the present invention.
0 is shown. The difference from the first embodiment shown in FIG. 1 is that, instead of the fringe analysis circuit 15, sub-scanning data showing the correspondence between the image data from the binarization circuit 14 and the movement amount of the scanner 10 in the sub-scanning direction. And a buffer memory 16A for storing the sub-scanning data from the fringe analysis circuit 15 in addition to the image data in place of the buffer memory 16 and the sub-scanning correction circuit 17, and stored in the buffer memory 16A. A coder 24 for converting the compressed image data and the sub-scanning data into compressed encoded data.
A memory 23 for storing the coded data; a decoder 19 for decoding the coded data stored in the memory 23 and re-converting it into decoded data corresponding to the original image and sub-scanning data; and storing the decoded data. Buffer memory 20, an image reproducing circuit 21 for reproducing image data of the original 4 as reproduced image data from the decoded data read from the buffer memory 20, and a printer 22 for recording the reproduced image data.

The operation will be described. First, the constituent elements 11 to 14 of the present embodiment are the same as those of the above-described first embodiment and the operation is also the same, so that the description thereof will be omitted.

Next, of the binary data from the binarization circuit 14, the data of 1600 pixels corresponding to the document area 2 is directly stored in the buffer memory 16A. Further, the 128 pixel signal corresponding to the pattern area 5 is supplied to the fringe analysis circuit 15A, and the fringe analysis circuit 15A analyzes the 128 pixels to show the correspondence between the data of 1600 pixels of the document area 2 and the movement amount in the sub scanning direction. Scan data is created and stored in the buffer memory 16A.

Next, the data format of the buffer memory 16A will be described. For convenience of explanation, the scan line L
Read image signals DATA (L2) to DATA of 1 to L20
It is assumed that the relationship between (L20) and the sub-scanning lines l _{1 to} l ₂₂ is as shown in Table 2 as in the first embodiment. Table 3 shows the first data format of the buffer memory 16A in this case. The sub-scanning data indicating the correspondence between the image data and the movement amount in the sub-scanning direction at this time is the number of sub-scanning timing pulses in Table 1.

[0076]

[Table 3] Table 4 shows the second data format of the buffer memory 16A. The difference from the first data format is that a plurality of lines of the data signal correspond to one sub-scanning line. For example, the data signal DATA (L
5) and DATA (L6) corresponding to one sub-scanning line in two lines, the same pixels in the main scanning direction of the image signals DATA (L5) and DATA (L6) of the scanning lines L5 and L6. Data signal {DATA (L
5) Insert 1 immediately after + DATA (L6)} / 2.

[0077]

[Table 4] Further, the data signals DATA (L15), DATA (L
2) of 6) corresponds to 1 sub-scanning line,
Since one line of the data signal DATA (L6) corresponds to two sub-scanning lines, the data signal {DAT
1, immediately after A (L15) + DATA (L16)} / 2,
Immediately after the data signal DATA (L16), 2 is temporarily stored in the buffer memory 16A. The image data stored in the buffer memory 16A is compressed by the coder 24, converted into encoded image data composed of a code such as MH or MR which is a compression code format, and stored in the memory 23. The data signal can be encoded as it is by using the compression code format MH or MR, but the correspondence between the data signal and the detection signal can be stored as it is in Tables 3 and 4. As described above, the scanner 10 stores the data signal of the original 4 and the correspondence between the data signal and the detection signal in the memory 23 in the form of encoded image data. When the image read by the scanner 10 needs to be reproduced, the coded image data stored in the memory 23 is read out by the decoder 19 and is decoded by the decoder 19 to obtain the data shown in Table 3 or Table 4.
To the original data format, and the image reproducing circuit 21 converts the image data of the original 4 into the data format of Table 2, and the printer 22 records the image data of the original 4.

FIG. 11 is a block diagram showing the external appearance of a third embodiment of the image reading apparatus of the present invention, in which components common to those in FIG. 1 are designated by common reference characters / numerals.
Referring to FIGS. 11A and 11B, the difference between the image reading apparatus of the present embodiment shown in this figure and the first embodiment described above is that the table sheet 1 is replaced by right and left end portions as described later. Table areas 1A having further partial pattern areas 105 and 106, a start line 8 indicating the start of sub-scanning, and a central line 7 orthogonal to the main scanning direction, and 1024 corresponding table sheets 1A instead of the scanner 10. Image sensor unit 11 of photoelectric conversion element (hereinafter referred to as element)
And a scanner 10A including A.

Referring to FIG. 12, which is a perspective view of the table sheet 1A from the upper surface to the lower surface, the table sheet 1A is a transparent plastic film having a thickness of 50 to 75 μm, like the table sheet 1 of FIG. The formed document area 2A, which is transparent like the document area 2, and the pattern areas 105 and 10 having diagonal striped patterns at both ends.
6, a black invalid area 6 on the outside thereof, a center line 7 composed of black stripes 7A and white stripes 7B orthogonal to each other in the central portion in the main scanning direction, and a black start line 8.

The patterns of the pattern areas 105 and 106 are in the main scanning direction, that is, C of the image sensor unit 11A.
Black stripes 105A, 106A inclined about 30 ° with respect to the CD
And the white stripes 105B, 106B, and the black stripes 105C, 106C that are located inside the above-mentioned oblique stripe pattern and are orthogonal to the main scanning direction.
And a vertical stripe pattern including D and 106D.

The width of the table sheet 1A in the main scanning direction should be read by the CCD of the image sensor unit 11A.
It is composed of a width of 872 pixels and a width of the black invalid areas 6 at both ends. The width of the inclined striped pattern inside each invalid area 6 is 128 pixels, and the vertical striped pattern inside the invalid area 6 is 8 pixels each of black stripes 105C and 106C and 10 white stripes.
5D and 106D for each 8 pixels, the center line 7 is a black stripe 7A,
Each white stripe 7B corresponds to 4 pixels. Therefore, the width of the transparent document area of the table sheet 1A is 1584 pixels, but the central 4 pixels is an opaque invalid area.

Some of the 1024 elements of the CCD are
These are allocated for the photodetection of the pattern areas 105 and 106 and the center line 7. The remaining CCD elements are assigned to read the original 4 through the document area 2A.

Referring to FIG. 11B, the scanner 10A of this embodiment has the same A as the scanner 1 of the first embodiment.
In addition to the GC circuit 12, the black-and-white correction circuit 13 and the binarization circuit 14, 1024 in place of the image sensor unit 11
An image sensor unit 11A of the element, a movement detection circuit 25 for calculating the movement amount of the scanner 10A in the sub-scanning direction from the movement amount in the main scanning direction from the pattern area 105 and outputting a corresponding sub-scanning timing pulse SD,
Black and white vertical stripe patterns (hereinafter referred to as sub-scanning lines) 105C, 105D, 106C, 106D in the sub-scanning direction orthogonal to the main scanning direction of the pattern areas 105, 106 and the main scanning direction of the scanner 10A from the center line 7. Of the sub-scanning lines 105C and 105 and the movement detection circuit 26 that calculates the movement amount of
From the distance between two points at which the sensor line of the scanner 10A intersects the boundary line of D or the boundary line of the sub-scanning lines 106C and 106D and the boundary line of the black stripe 7A and the white stripe 7B of the center line, the main line of the sensor line is detected. A tilt detection circuit 28 that calculates a tilt with respect to the scanning direction and generates a tilt signal SK.
A buffer memory 16B for temporarily storing the binary image data corresponding to the document area 2A, and the image data stored in the buffer memory 16B in response to the sub-scanning timing pulse SD, the line synchronization signal SH and the tilt signal SK, A data correction circuit 27 for generating correction data corresponding to the relative movement distances in the sub-scanning direction and the main scanning direction,
And a timing generation circuit 18A.

Next, referring to FIGS. 11 and 12, the operation of this embodiment will be described. The number of pixels of the CCD of the image sensor unit 11A of the scanner 10A is 1024, which is smaller than that of the first embodiment. Since the width of the original 4 is 1600 pixels as in the first embodiment, the original 4
To read the whole, read it in two times on the left and right. Since the left and right reading operations of the document are the same, the reading operation of the left half of the document 4 will be described here.

First, as shown in FIG. 11A, the scanner 10A is placed on the left half of the table sheet 1A overlaid on the original 4. At this time, the left edge of the pattern area 105 on the left side is made to coincide with the left edge of the reading area having a width of 1024 elements (pixels) of the scanner 10A. At this time, the scanner 10
The right end of the reading area of A is a position separated by about 80 pixels from the right side of the center line 7.

The reflected light of the image of the original 4 which has passed through the table sheet 1A and the reflected light from the striped pattern of the pattern area 105 which is tilted by about 30 ° are received by the image sensor unit 11A, and the CCD 10 through the lens system.
It is projected on each of the 24 elements. Similar to the first embodiment, in response to the data clock pulse and the scan start signal from the timing generation circuit 18A, the image sensor unit 11A performs the sequential data read operation of the 0th to 1023th photoelectric conversion elements. Then, the analog read data signal is supplied to the AGC circuit 12. AGC circuit 1
The read data signal amplified by 2 is used as the black and white correction circuit 13
Then, the variation of the illuminance of the LED light source and the variation of the sensitivity of the element are sequentially corrected, and the analog-digital conversion is performed and the binary signal is supplied to the binarization circuit 14. The binarization circuit 14 compares the supplied digital signal with a set threshold value, and the output signal is binary data composed of a black signal “1” corresponding to the threshold value or more and a white signal “0” corresponding to the threshold value or less. To generate. As a result, the 1024 digital data signals are converted into binary data.

The binary data of 1024 pixels is stored in the buffer memory 16B. Further, data of 128 pixels of the inclined stripe pattern corresponding to the black stripes 105A and the white stripes 105B of the pattern area 105 in the binary data is supplied to the movement detection circuit 25, and the movement detection circuit 25 outputs the data of 128 pixels. Is analyzed to generate a sub-scanning timing pulse SD, which is supplied to the data correction circuit 27. Black stripes 105C and white stripes 10 in the pattern area 105 of the binary data
The data of 80 pixels including the data of 16 pixels of the vertical stripe pattern corresponding to 5D and the data of 32 pixels before and after the vertical stripe pattern is supplied to the movement detection circuit 26, and the movement detection circuit 26 outputs the data of
Data for 0 pixels is analyzed to generate a line synchronization signal SH, which is supplied to the data correction circuit 27. Of the binary data, the data of 8 pixels of the center line 7 and the data of 32 pixels before and after it are combined, and the data of 72 pixels and the data of 16 pixels of the vertical stripe pattern and the data of 32 pixels each before and after it are combined. The data for 80 pixels is supplied to the inclination detection circuit 28, and the inclination detection circuit 28 analyzes these data to generate the inclination signal SK and supplies it to the data correction circuit 27.

The operation of the movement detection circuit 25 is similar to that of the fringe analysis circuit 15 of the first embodiment.

Here, it is assumed that the image reading apparatus of the present embodiment has a resolution of 8 pixels / mm in the main scanning direction and 8 scanning lines / mm in the sub-scanning direction, as in the first embodiment. The field of view of each element of the image sensor unit 11A is one pixel, that is, 1/8 mm × 1/8 mm.

Next, the movement of the visual field of the element of the image sensor unit 11A based on the relative movement of the scanner 10A with respect to the table sheet 1A in the main scanning lines L1 to L9 and the line synchronization signal which is the output of the movement detection circuit 26 at that time. The operation of the movement detection circuit 26 will be described with reference to FIG. 13 showing SH in the same manner as in the first embodiment. In the same manner as in the first embodiment, the element data read sampling operation of main scanning is performed at a constant sampling speed for each scanning start signal. Repeated. Similarly, each of the scan lines L1 to L9 indicates the scanning start position of these scan lines. That is, the scan of the scan line Ln is performed at the position between the n-th scan line Ln and the next scan line Ln + 1 by the movement in the sub-scanning direction. The movement detection circuit 26 is a pixel position 96-1 of the CCD of the image sensor unit 11A of the scanner 10A.
The binary data of 75 80 pixels is sampled to detect the position of the start line and the main scanning direction.

Prior to reading the original 4, the scanner 10
A is placed on the start line 8 of the table sheet 1A and scanning is started from here. The hatched portions of the scanning lines L1 to L3 in FIG. 13 indicate the reading of the start line 8.
Since the position in the main scanning direction is not determined in this section, the line synchronization signal SH is not generated, that is, it remains at the L level. Alternatively, as indicated by the dotted line, the line synchronization signal SH is output to the pixel position 136 which is the standard position. After the scanning of the start line 8 is completed, the scanning from the scanning line L4 to the document area 2
The scan of A is started. When the scanning of the document area 2A is started, the scanning of the vertical stripe pattern of the table sheet 1A, that is, the black stripes 105C and the white stripes 105D is started. At this time, at the standard position, the boundary point between the black stripes 105C and the white stripes 105D is the pixel position 136. However, if the deviation is within ± 32 pixels, the boundary point between the black stripe 105C and the white stripe 105D can be detected.
The movement detection circuit 26 detects a boundary point between the black stripes 105C and the white stripes 105D and generates a line synchronization signal SH. That is, the line synchronization signal SH corresponding to one pixel at the boundary point is set to H
To level.

As a method for preventing the malfunction of the movement detection in the main scanning direction, the continuation of the black stripes 105C and the continuation of the white stripes 105D before and after the boundary point between the black stripes 105C and the white stripes 105D is checked, or the previous scan line and the current scan are performed. There is a method of detecting that the line shift is within a certain pixel.

Next, referring to FIG. 14 showing the positional relationship when the scanner 10A is placed on the left half of the table sheet 1A, the operation of the inclination detection circuit 28 will be described. The sensor line SLN of the scanner 10A has vertical stripes. At the boundary line between the black stripes 105C and the white stripes 105D of the circular pattern and the point V,
The black line 7A and the white line 7B of the center line 7 intersect with the boundary line at a point W, respectively. When the distance between the point V and the point W is m, the angle θ at which the sensor line, SLN and the main scanning direction of the table sheet 1A intersect is expressed by the following equation.

Mcos θ = 800 (pixel) θ = cos ⁻¹ (800 / m) (1) The point V is detected by the position detection circuit 26 as described above. The point W is also detected by the inclination detection circuit 28 in the same manner as the point V. The distance m between the points V and W is obtained from the positions of the points V and W on the sensor line SLN. Therefore,
From the equation (1), the sensor line SLN and the table sheet 1
An angle θ at which the main scanning direction A intersects is obtained. In this embodiment, the offset angle of the sensor line SLN is Θ = 5.
If the angle is 7 °, the allowable range of the angle θ in the reading scan is about 0 to 10 °, m = 800 pixels when θ = 0 °, m = 804 pixels when θ = Θ = 5.7 °, and θ = 10 pixels.
When the angle is °, m = 812 pixels. Further, the same data is obtained when the direction of the angle θ is opposite to the direction indicated by the arrow, but which direction can be easily determined by the operator.

Next, the operation of the data correction circuit 27 will be described. The data correction circuit 27 corrects the binary image data temporarily stored in the buffer memory 16B in the following procedure.

First, the pixel of the eighth pixel from the position of the line synchronization signal SH is set as the first pixel of each scanning line. In the example of FIG. 13, since the line synchronization signal SH of the scanning lines L4 and L5 is at the pixel position 132, the pixel position 140 is changed to L4 and L5.
Is the first pixel of the scan.

Then, similarly to the second embodiment, the movement in the sub-scanning direction is corrected based on the detection result of the movement detection circuit 25. Finally, the inclination is corrected by the inclination signal SK.
When the left half of the original 4 is read by the scanner 10A as described above, the scanner 10A is placed on the right half of the table sheet 1A. At this time, the right edge of the right pattern area 106 is made to coincide with the right edge of the reading area 1024 element of the scanner 10A. Further, prior to reading the right half of the original 4, the scanner 10A is placed on the start line 8 of the table sheet 1A, and scanning is started from here. By doing so, the right half of the original can be read in the same way as the left half.

Here, the original for four pixels of the center line 7 of the table sheet 1A cannot be read, but this portion can be corrected by the data correction circuit 27 from the information on the left and right thereof.
For example, it may be determined that two pixels each on the left side and two pixels on the right side of the black stripe 7A are the same as the two pixels adjacent to each other.

Next, the table sheet 1B featuring the fourth embodiment of the present invention is seen through from the upper surface to the lower surface, and the scanner 10A is attached to the left half of the table sheet 1B.
FIG. 15 is a diagram showing the positional relationship when the keys are placed at the same time.
Referring to FIG. 3, the difference between the table sheet 1B of the present embodiment and the table sheet 1A of the third embodiment is that the transparent document area 2 surrounded by the start line 208 and the invalid area 6 is used.
Black stripes, white stripes 205A, 205B and black stripes, white stripes 206A, 206B, which are inclined stripe patterns each having a width in the main scanning direction of 2 pixels, and black stripes, white stripes 105A,
Instead of 105B, 106A, and 106B, the width in the main scanning direction is 2 pixels each, and the vertical stripe pattern black stripes and white stripes 205 are orthogonal to the main scanning direction and cut the start line 208.
C, 205D and black stripes, white stripes 206C, 206D,
Instead of the center line 7, the width in the main scanning direction is 2 pixels each, and the center line 207 is formed by vertical stripe-shaped patterns black stripes and white stripes 207A and 207B that cut the start line 208, and the start line 8 is replaced by the main scanning direction. White stripes 205D, 20 in black stripes
Start line 20 with each end of 6D and 207B
8 and.

In the reading operation of this embodiment, the document placed under the table sheet 1B is read by the scanner 10A in two times, right and left, as in the third embodiment.

Referring to FIGS. 15 and 11B, the reading operation of the left half will be described as in the third embodiment.
First, the scanner 10A is placed on the start line 208 of the table sheet 1B, and scanning is started from here. The difference from the third embodiment is that, as described above, the black start line 2
Since the white stripes 205D, 207B, and 206D also exist within 08, the position in the main scanning direction can be detected by reading the start line 208.

The image signal read by the image sensor unit 11A of the scanner 10A is converted into binary data through the AGC circuit 12, the black-and-white correction circuit 13, and the binarization circuit 14, stored in the buffer memory 16B, and moved. The operation up to the supply to the detection circuit 25 is the same as the operation of the third embodiment.

Referring also to FIG. 16 showing the movement of the field of view of the elements of the image sensor unit 11A based on the relative movement of the scanner 10A and the table sheet in the main scanning lines L1 to L9, the element data read sampling operation which is the main scanning is performed. It is repeated at a constant sampling rate for each scanning start signal.

As described above, in order to detect the moving distance for each 1/8 mm which is the nominal scan line interval, the document area 2 is detected.
The inclined striped patterns on both sides of A are about 3 in the main scanning direction.
It is tilted by 0 °, and the black and white boundary point detection position DPP is set by the movement detection circuit 25. The movement detection circuit 25 checks whether or not the interval between the scanning lines has reached 1/8 mm in response to the relative movement of the hand scanner 10A, and generates the sub-scanning timing pulse SD. The black-and-white boundary point detection position DPP is a detection window corresponding to the size of one pixel, that is, 1/8 mm. The initial position of the black-and-white boundary point detection position DPP is set to the pixel position 136.

Initial position setting of the black-and-white boundary point detection position DPP, sub-scanning timing pulse SD corresponding to each scanning line
Is basically the same as the operation of the fringe analysis circuit 15 of the first embodiment, the black pixel is at the black-white boundary point, the detection position DP is at the detection position DPP,
The buffer memory 16 is stored in the buffer memory 16B, and the pixel positions 50, 52, 54, and 56 are respectively stored in the pixel position 13
6, 138, 140 and 142, respectively, are shown by the flowchart of FIG. 7 of the first embodiment and its description.

Since there is a stripe pattern in the document area 2A of the table sheet, the content of the document may be erroneously detected as a black-white boundary point. To prevent this, the width of the black stripes and the white stripes in the main scanning direction in this embodiment is two pixels, but this width can be increased. However, in that case, it becomes difficult to correct the content of the original document under the striped pattern from the surrounding data. Another method for preventing erroneous detection is to use a plurality of stripe patterns.

Next, the operation of the movement detection circuit 26 is similar to that of the third embodiment, but the position in the main scanning direction can be detected by reading the start line 208, so that the control is easier than in the third embodiment. .

The operation of the inclination detection circuit 28 is similar to that of the third embodiment, and the inclination is obtained from the boundary point between the black stripes 205C and the white stripes 205D and the boundary point between the black stripes 207A and the white stripes 207B.

Since the pattern areas 105 and 106 of the third embodiment are unnecessary in the fourth embodiment, the readable original width can be increased correspondingly.

Next, the table sheet 1C featuring the fifth embodiment of the present invention is seen through from the upper surface to the lower surface, and the scanner 10A is attached to the left half of the table sheet 1C.
FIG. 17 is a diagram showing a positional relationship at the same time when the
Referring to FIG. 5, the difference between the table sheet 1C of the present embodiment and the table sheet 1B of the fourth embodiment is that the parallel striped patterns 305A, 305B, 3 used for inclination detection are used.
05C, 305D, 306A, 306B, 306C, 3
06D is tilted by an angle θ ₁ instead of being parallel to the sub-scanning direction. By doing this, the scanner 1
The 0A sensor line SLN can be aligned with the main scanning direction. The sensor line SLN is the boundary line between the black stripe 305C and the white stripe 305D and the point V, and the black stripe 305 of the striped pattern is formed.
The line A and the white stripe 305B intersect with each other at a point W. Set the distance between lines formed by the black and white boundary points of the parallel striped pattern to 5
00 pixels.

When the distance between the point V and the point W is n, the angle θ at which the sensor line SLN and the table sheet 1C intersect is expressed by the following equation.

Ncos θ = 500 (pixel) θ = cos ⁻¹ (500 / n) (2) The points V and W are the movement detection circuit 26 and the inclination detection circuit 28.
Are detected in the same manner as in the third embodiment. Next, the distance n between the points V and W is obtained from the positions of the points V and W on the sensor line SLN. Therefore, the angle θ at which the sensor line SLN and the main scanning direction of the table sheet 1C intersect is obtained from the equation (2). In FIG. 17, when θ = θ ₁ , the sensor line SLN coincides with the main scanning direction as indicated by the solid line. Further, as shown by the alternate long and short dash line, when the sensor line SLN is inclined with respect to the main scanning direction,
The inclination angle θ is obtained by the equation (2), and the angle between the sensor line SLN and the main scanning direction is θ−θ ₁ .

In the third and fourth embodiments, the inclination direction of the scanner is determined by the operator's judgment. In the fifth embodiment, however, if the inclination angle θ is within the angle θ ₁ , the direction with respect to the main scanning direction is set. It is possible to detect tilts in both directions.

In the scanning of the start line 308, it is possible to detect whether the scanning is on the left side or the right side of the table sheet 1C based on the position of the striped pattern, and the operator can detect the left side of the image reading apparatus of the present embodiment. It is also possible to instruct which of the right and left scans. Further, the scanning is further divided into three or more times instead of two times on the left and right, so that the scanner 10
The size of A can be reduced.

[0115]

As described above, in the image reading apparatus of the present invention, the reading resolution in the sub-scanning direction changes in response to the change in the relative moving speed in the sub-scanning direction. In the part where the image is fine, the moving speed is reduced to increase the resolution to improve the image quality.
There is an effect that the image reading speed can be improved by increasing the moving speed in the portion where the characters and images are coarse.

Further, the moving direction in the sub-scanning direction can be both forward and reverse directions, which is advantageous in that it is convenient and the reading efficiency can be improved.

Furthermore, since the table sheet including the striped pattern for detecting the moving speed is separately provided, the scanner body can be made smaller and lighter.

Furthermore, since the relative position is recorded by the striped pattern as the position information to be recorded on the table sheet, the cost of the table sheet is low and the position detection accuracy can be improved.

[Brief description of drawings]

1A is an external view showing a first embodiment of an image reading apparatus of the present invention, and FIG. 1B is a block diagram showing the configuration of the scanner in FIG. 1A.

FIG. 2 is a partial plan view showing details of the table sheet shown in FIG.

FIG. 3 is a first diagram showing a time chart of signals corresponding to a relationship between a stripe pattern and a scanning line due to relative movement of a scanner and a table sheet at a variable speed.

FIG. 4 is a second diagram showing a time chart of signals corresponding to a relationship between a stripe pattern and a scanning line due to relative movement of a scanner and a table sheet at a variable speed.

FIG. 5 is a third diagram showing a time chart of signals corresponding to the relationship between the stripe pattern and the scanning line due to the relative movement of the scanner and the table sheet at a variable speed.

FIG. 6 is a fourth diagram showing a time chart of signals corresponding to the relationship between the stripe pattern and the scanning line due to the relative movement of the scanner and the table sheet at a variable speed.

FIG. 7 is a flowchart showing the operation of the image reading apparatus of this embodiment.

FIG. 8 is a diagram showing a time chart of signals corresponding to a relationship between a stripe pattern and a scanning line due to relative movement of a scanner and a table sheet in opposite directions.

9A to 9F are views for explaining the relationship between the scanning direction and the reading and reading of the buffer memory.

FIG. 10 is a block diagram showing a configuration of a scanner showing a second embodiment of the image reading apparatus of the invention.

FIG. 11 is an external view showing a third embodiment of the image reading apparatus of the present invention and a block diagram showing the configuration of a scanner.

12 is a partial plan view showing details of the table sheet in FIG. 11. FIG.

FIG. 13 is a diagram showing a time chart of a line synchronization signal and a relationship between a stripe pattern and a scanning line by relative movement of a scanner and a table sheet of this embodiment at a variable speed.

FIG. 14 is a diagram showing a positional relationship when a scanner is placed on the left half of the table sheet of this embodiment.

FIG. 15 is a partial plan view showing details of a table sheet according to a fourth embodiment of the present invention.

FIG. 16 is a diagram showing a time chart of signals corresponding to the relationship between the stripe pattern and the scanning line due to the relative movement of the scanner and the table sheet of this embodiment at a variable speed.

FIG. 17 is a partial plan view showing details of the table sheet according to the fifth embodiment of the present invention.

FIG. 18 (A) shows a conventional first image reading device.
Is a block diagram showing its configuration, FIG. 6B is a diagram showing details of the cylinder, and FIG. 4C is a diagram showing a relationship between a line code inclination angle φ and a lead angle θ.

FIG. 19 is a schematic external view showing main components of a conventional second image reading apparatus.

20 is a partial plan view showing details of the document table of FIG.

FIG. 21 is a block diagram showing the configuration of the image reading apparatus shown in FIG.

22 is a diagram showing a time chart of signals corresponding to the relationship between the stripe pattern and the scanning line due to the relative movement of the document and the CCD unit of FIG.

23 is a flowchart showing the operation of the image reading apparatus shown in FIG.

FIG. 24 is a perspective view of an image reading state of a third conventional image reading apparatus.

25A is a diagram showing an image read by the hand scanner shown in FIG. 24 in an inclined state of an angle θ, FIG. 25B is a diagram showing read image information, and FIG. 25C is a diagram showing the image information shown in FIG. It is a figure restored to the state of.

FIG. 26A is a block diagram showing a configuration of a conventional fourth image reading device, FIG. 26B is a bottom view of a hand scanner,
(C) is a diagram showing a state in which the hand scanner scans a page of text covered with a light-transmitting sheet, and (D) is a bottom view of another type of hand scanner.

[Explanation of symbols]

1, 1A, 1B, 1C Table sheet 2, 2 Document area 4 Manuscript 5, 105, 106, 205, 206, 305, 30
6,406 Pattern area 6 Invalid area 7, 107, 207, 307 Center line 8, 108, 208, 308 Start line 10, 10A Scanner 11, 11A Image sensor unit 12 AGC circuit 13 Black-and-white correction circuit 14 Binarization circuit 15 Stripe Analysis circuit 16, 16A, 16B, 20 Buffer memory 17 Sub-scanning correction circuit 18, 18A Timing generation circuit 19 Decoder 21 Image correction circuit 22 Printer 23 Memory 24 Coder 25, 26 Movement detection circuit 27 Data correction circuit 28 Tilt detection circuit

Claims (15)

[Claims] 1. An image of an original is imaged by electro-optically scanning an original with a predetermined main scanning period in a main scanning direction along the direction of the linear array by a plurality of photoelectric conversion elements arranged in a linear array. A scanning unit including an electro-optical conversion device, which is converted into a data signal and moves with respect to the original in a sub-scanning direction orthogonal to the main scanning direction; and a transparent portion which is superimposed on the original and allows the original to be seen through. A manuscript area and a striped pattern composed of black and white stripes arranged parallel to one side of the manuscript area along the sub-scanning direction and having a predetermined inclination and width with respect to the main scanning direction. A table sheet having a pattern area, and a pattern for electro-optically scanning the striped pattern in the main scanning direction to generate a pattern signal having a predetermined resolution corresponding to the striped pattern. In response to the supply of the pattern signal and the pattern signal, the striped pattern is formed by a distance corresponding to a relative movement of the scanning unit with respect to the document by a predetermined distance in the sub-scanning direction. A movement detection unit that detects movement in the main scanning direction and generates a movement detection signal; a storage control unit that stores the image data signal in a buffer memory at each main scanning cycle; and an output from the movement detection unit. Image reading including a correction data generation unit that generates correction data corresponding to the relative movement distance of the scanning unit in the sub-scanning direction from the image data signal stored in the buffer memory in response to the movement detection signal. apparatus. 2. The movement detecting means includes a detection window of the size of a unit pixel corresponding to the resolution that can be set at an arbitrary pixel position in the main scanning direction of the pattern area, and when the pattern area is scanned in the main scanning direction. , The movement detection signal is generated by coincidence of the detection window and the black stripe, and at least one detection window is preset in the main scanning direction by the sub-scanning timing signal generated in response to the movement detection signal. The image reading apparatus according to claim 1, wherein the image reading apparatus repeats the next main scanning period by shifting the number of pixels. 3. The time between generations of the first and second movement detection signals successively by the correction data generating means.
When the image data signals stored in the buffer memory at the detection intervals are signals of a plurality of main scanning lines corresponding to the plurality of main scanning periods, pixels of the same position of the plurality of main scanning lines are associated with each other. An average value of data is generated as the correction data in response to the second movement detection signal, and the image data signal stored in the buffer memory at the one detection interval is an image data signal of less than one cycle. In this case, the image reading apparatus according to claim 1, wherein an image data signal corresponding to the immediately preceding main scanning period is generated as the correction data in response to the movement detection signal. 4. A hand scanner comprising the scanning unit including the pattern signal generating unit, the movement detecting unit, the storage control unit, and the correction data generating unit, the hand scanner performing relative movement in the sub-scanning direction by hand. The image reading apparatus according to claim 1, further comprising the table sheet. 5. An image of the original document is imaged by electro-optically scanning the original document in a main scanning direction along the direction of the linear array at a predetermined main scanning period by a plurality of photoelectric conversion elements arranged in a linear array. A scanning unit including an electro-optical conversion device, which is converted into a data signal and moves with respect to the original in a sub-scanning direction orthogonal to the main scanning direction; and a transparent portion which is superimposed on the original and allows the original to be seen through. A manuscript area and a striped pattern composed of black and white stripes arranged parallel to one side of the manuscript area along the sub-scanning direction and having a predetermined inclination and width with respect to the main scanning direction. A table sheet having a pattern area, and a pattern for electro-optically scanning the striped pattern in the main scanning direction to generate a pattern signal having a predetermined resolution corresponding to the striped pattern. In response to the supply of the pattern signal and the pattern signal, the striped pattern is formed by a distance corresponding to a relative movement of the scanning unit with respect to the document by a predetermined distance in the sub-scanning direction. The movement of the main scanning direction is detected, a movement detection signal is generated, and the number of main scanning lines of the image data included in the relative movement range of the scanning unit in the sub scanning direction for the predetermined distance is set. An image reading apparatus including: a movement detecting unit that generates sub-scanning data; and a buffer memory that stores the image data signal and the sub-scanning data for each main scanning cycle. 6. The image reading apparatus according to claim 5, further comprising an image reproducing unit that reproduces an image of the original from the image data signal read from the buffer memory and the sub-scanning data. 7. An image of the document is imaged by electro-optically scanning the document in a main scanning direction along the direction of the linear array at a predetermined main scanning period by a plurality of photoelectric conversion elements arranged in a linear array. A scanning unit including an electro-optical conversion device, which is converted into a data signal and is moved with respect to the original in a sub-scanning direction orthogonal to the main scanning direction; And a first stripe of black and white stripes arranged parallel to at least one side of the original area along the sub-scanning direction and having a predetermined inclination and width with respect to the main scanning direction. A pattern sheet and a table sheet having a pattern region including black and white stripes having a predetermined width and at least two second stripe patterns parallel to the sub-scanning direction, Pattern signal generating means for electro-optically scanning the first and second striped patterns in the main scanning direction to generate pattern signals having a predetermined resolution corresponding to the first and second striped patterns. And in response to the supply of the pattern signal, the first striped pattern is moved by the main scanning by a distance corresponding to a relative movement of the scanning unit with respect to the document by a predetermined distance in the sub-scanning direction. The movement of the scanning unit is displaced from the sub-scanning direction in response to the supply of the pattern signal, the first movement detecting unit detecting a movement in the direction and generating a first movement detection signal. When the relative movement with respect to the original document occurs over a predetermined distance in the main scanning direction,
A second movement detecting means for detecting a corresponding movement of the second striped pattern in the main scanning direction and generating a second movement detection signal; Of the second stripe-shaped patterns to detect the inclination of the linear array with respect to the main scanning direction to generate an inclination signal, and the image data signal for each main scanning cycle. Storage control means for storing in a buffer memory, and a relative movement distance in the sub-scanning direction and the main scanning direction from the image data signal stored in the buffer memory in response to the first and second movement detection signals An image reading apparatus including a correction data generation unit configured to generate correction data. 8. A hand scanner comprising the scanning unit including the pattern signal generating unit, the movement detecting unit, the storage control unit, and the correction data generating unit, and performing a relative movement in the sub-scanning direction by hand. The image reading apparatus according to claim 7, further comprising the table sheet. 9. The table sheet is one of the second striped patterns, and is arranged in parallel with a center line arranged in the central portion of the original area in advance in the main scanning direction. It has one black stripe of a predetermined width, and has a start line used as a reference line for starting sub-scanning,
Further, one of the first striped pattern and one of the second striped pattern are arranged on both sides of the center line,
The hand scanner includes a scanning unit having a length sufficient to scan the first striped pattern and the second striped pattern on the left side or the right side of the center line including the center line during main scanning. Item 8. The image reading device according to item 8. 10. An image of an original is imaged by electro-optically scanning an original in a main scanning direction along the direction of the linear array at a predetermined main scanning period by a plurality of photoelectric conversion elements arranged in a linear array. A scanning unit including an electro-optical conversion device, which is converted into a data signal and moves with respect to the original in a sub-scanning direction orthogonal to the main scanning direction; and a transparent portion which is superimposed on the original and allows the original to be seen through. A predetermined original area, and at least one first striped pattern composed of black and white stripes arranged in the original area and having a predetermined inclination and width with respect to the main scanning direction; A table sheet having a pattern region including black and white striped patterns having a width and at least two second striped patterns parallel to the sub-scanning direction; and the first and second table sheets. Pattern signal generating means for electro-optically scanning a striped pattern in the main scanning direction to generate a pattern signal having a predetermined resolution corresponding to the first and second striped patterns; and the pattern signal. In response to the supply of the first stripe pattern in the sub-scanning direction, the first striped pattern is moved in the main scanning direction by a distance corresponding to a relative movement of the scanning unit with respect to the document. And a first movement detecting unit that generates a first movement detection signal, and the movement of the scanning unit deviates from the sub-scanning direction in response to the supply of the pattern signal. When a relative movement with respect to the original occurs over a predetermined distance,
Second movement detecting means for detecting a corresponding movement of the second striped pattern in the main scanning direction to generate a second movement detection signal; Of the second stripe-shaped patterns to detect the inclination of the linear array with respect to the main scanning direction to generate an inclination signal, and the image data signal for each main scanning cycle. Storage control means for storing in a buffer memory, and a relative movement distance in the sub-scanning direction and the main scanning direction from the image data signal stored in the buffer memory in response to the first and second movement detection signals An image reading apparatus including a correction data generation unit configured to generate correction data. 11. A hand scanner comprising the scanning unit including the pattern signal generating unit, the movement detecting unit, the storage control unit, and the correction data generating unit, the hand scanner performing relative movement in the sub-scanning direction by hand. The image reading apparatus according to claim 10, further comprising the table sheet. 12. The table sheet is one of the second striped patterns, and is arranged in parallel with a center line arranged in the center of the document area in advance in the main scanning direction. It has one black stripe of a predetermined width, and has a start line used as a reference line for starting sub-scanning. Further, the first stripe pattern and the second stripe are provided on both sides of the center line. And the striped patterns are arranged one by one, and the hand scanner scans the first striped pattern and the second striped pattern on the left side or the right side of the center line including the center line in the main scanning. The image reading device according to claim 11, further comprising a scanning unit having a length sufficient for the scanning. 13. An image of the original is imaged by electro-optically scanning the original in a main scanning direction along the direction of the linear array at a predetermined main scanning period by a plurality of photoelectric conversion elements arranged in a linear array. A scanning unit including an electro-optical conversion device, which is converted into a data signal and is moved with respect to the original in a sub-scanning direction orthogonal to the main scanning direction; A manuscript area, and at least two first striped patterns each of which is arranged in the manuscript area and is composed of black and white stripes having a predetermined inclination and width with respect to the main scanning direction. A table sheet having a pattern area including black and white striped patterns having a width and at least one second striped pattern parallel to the sub-scanning direction; and the first and second table sheets. Pattern signal generating means for electro-optically scanning a striped pattern in the main scanning direction to generate a pattern signal having a predetermined resolution corresponding to the first and second striped patterns; and the pattern signal. In response to the supply of the first stripe pattern in the sub-scanning direction, the first striped pattern is moved in the main scanning direction by a distance corresponding to a relative movement of the scanning unit with respect to the document. And a first movement detecting unit that generates a first movement detection signal, and the movement of the scanning unit deviates from the sub-scanning direction in response to the supply of the pattern signal. When a relative movement with respect to the original occurs over a predetermined distance,
Second movement detection means for detecting a corresponding movement of the second striped pattern in the main scanning direction to generate a second movement detection signal; and Inclination detecting means for measuring an interval between the two striped patterns and detecting an inclination of the linear array with respect to the main scanning direction to generate an inclination signal; Storage control means for storing the image data signal stored in the buffer memory in response to the first and second movement detection signals, and a correction corresponding to a relative movement distance in the sub-scanning direction and the main scanning direction. An image reading apparatus including a correction data generation unit that generates data. 14. A hand scanner comprising the scanning unit including the pattern signal generating unit, the movement detecting unit, the storage control unit, and the correction data generating unit, and a hand scanner that performs relative movement in the sub-scanning direction by hand. The image reading apparatus according to claim 13, further comprising the table sheet. 15. The table sheet is the second striped pattern, and has a predetermined width that is arranged in parallel with a center line arranged in the center of the document area. And a start line used as a reference line for starting sub-scanning, and further, two first striped patterns are arranged on both sides of the center line. 9. The image reading apparatus according to claim 8, wherein the hand scanner has a scanning unit having a length sufficient to scan the first striped pattern on the left side or the right side of the center line in the main scanning. .