JPH03201664A - Manual picture reader and reading method - Google Patents

Abstract

PURPOSE:To enable accurate picture read while correcting position error even when there is fluctuation in a main scanning direction by arranging a position detecting means in the main scanning direction of a line sensor, calculating obtained position information for two components and setting the read pitch interval of the line sensor. CONSTITUTION:When frames designating addresses at prescribed pitch intervals are formed in a memory 26 in advance and an original image at an address position 26A corresponding to a frame 26B is inputted to the corresponding frame 26B position by dots based on the X-Y position information each time the original image is read by the line sensor, picture read is not overlapped. As the detecting means to obtain the position information of the X-Y components, a spherical turn roller, concretely, mouses 11A-11B are used and continuously turned without separating the above mentioned spherical body from the surface of an original from the starting position of picture read to the ending position at the time of manual scanning. Thus, the X-U address information is accurately obtained over the whole scanning block while being mutually related.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a manual image reading device used as a handy scanner or a portable copying machine, and a reading method therefor. The present invention relates to a manual image reading device that reads a document image guided onto a sensor at predetermined pitch intervals, and a reading method thereof.

``Prior art'' Unlike conventional image scanners and facsimile machines, there is no need to incorporate an automatic document feed mechanism into the device, and the image reading unit is manually moved to scan a stationary document surface to scan a predetermined width area. Handy scanners and portable copying machines that are capable of reading original images are well known, and the image reading section of these types of devices all use an illumination light source that irradiates the original surface with light, and an image-forming device that converts light reflected from the original surface into an image. a reading optical system consisting of an optical lens that causes the optical lens to move, a COD or other line sensor arranged at the imaging position of the optical lens, and a reading optical system that moves in a direction (sub-scanning direction) orthogonal to the main scanning direction of the line sensor. The moving member moves the reading optical system in the sub-scanning direction and reads the image guided onto the line sensor at predetermined pitch intervals, and stores the read signal in a memory. An image can be reproduced by supplying it to a computer and printing it.

``Technical Problems to be Solved by the Invention'' According to the prior art, miniaturization is achieved by omitting the so-called automatic document feeding mechanism and switching to manual scanning.
Since the amount of movement detected by manual scanning is generally performed using an encoder, only the amount of movement in the sub-scanning direction can be detected.

This requires that the reading optical system, like the document feed mechanism, always be accurately moved in the sub-scanning direction during manual scanning.
Not only does moving scanning require skill, but even if there is wobbling in the main scanning direction during moving scanning, this cannot be detected as position information; Since information cannot be synchronized and the reading pitch fluctuates, as a result, accurate image reading becomes impossible.

Also, the fact that only the movement information in the sub-scanning direction can be obtained by the encoder means that the image can only be read in the spatial area sandwiched between the pair of moving members that move and scan the document surface, so the reading width is is extremely limited, making it impossible to read documents over a wide range.

In view of the drawbacks of the prior art, the present invention provides a manual image reading device and a reading method thereof, which can read images with high precision while correcting positional errors even if there is wobbling in the main scanning direction during moving scanning. The purpose is to provide.

Another object of the present invention is to enable highly accurate image reading even when a wide area of the original surface is freely scanned, without being restricted by the spatial area sandwiched between a pair of moving members that move and scan the original surface. It is an object of the present invention to provide a manual image reading device and a reading method therefor.

"Technical means to solve problems" The present invention was made based on the following idea.

First, since the original image read by the line sensor is always a straight line image along the main scanning direction, the X-Y components at at least two points in the main scanning direction, as shown in FIG. If you can obtain the location information, Y=aX+b
It is possible to obtain the slope amount (a) and the constant (b) of a linear function consisting of, for example, B-4, which has been previously addressed at predetermined pitch intervals in the memory 26 shown in FIG.
A square of approximately the same size is formed, and an address position 26A corresponding to the square 26B is located based on the XY position information.
Each time the line sensor reads the original image, the corresponding square 26
It is preferable to input a dot at position B, since there will be no duplication of image reading.

Further, the pitch interval in this case may be configured such that the image is read when the distance Pi between the center points of the line sensor or the maximum separation distance P2 on either the left or right side thereof moves by a predetermined pitch.

The detection means for obtaining the positional information of the X-Y components is a spherical rolling roller, more specifically a mouse IIA.
-11B is preferably used.

That is, as shown in FIG. 5, the mouse IIA-11B was
By continuously rolling the sphere from the image reading start position to the end position during manual scanning without separating it from the document surface, it is possible to obtain accurate X-Y address information in the entire scanning area while correlating each other. .

Of course, the present invention is not limited to the above-mentioned mouse, and it is not necessary to use the detection member 4 that contacts the document surface, but simply detects the X at at least two points along the main scanning direction of the line sensor. If the position information of the -Y component can be obtained continuously or at predetermined pitch intervals, the feed amount and address position can be easily calculated, and the effects of the present invention can be smoothly achieved.

In the embodiment described later, a line sensor is configured using a reduction optical system consisting of a light source, a reduction lens, and a CD, but the present invention is not limited to this only, and includes an LED array, a lens array, and a light receiving system. It is also possible to use a close-contact type line sensor using a lens array consisting of a combination of an LED array and a light receiving section, or a completely close-contact type line sensor consisting of a combination of an LED array and a light receiving section, and the same effect can be obtained in this case as well.

"Embodiments" Hereinafter, embodiments of the present invention will be described in detail by way of example based on the drawings. However, unless otherwise specified, the dimensions, materials, shapes, and relative positions of the components described in this example are not intended to limit the scope of this invention, but are merely illustrative examples. Not too much.

Fig. 2 shows a handy scanner according to an embodiment of the present invention, in which the lower portions of both sides of a flat rectangular parallelepiped stand vertically, and the lower part of the case has a rectangular convex shape and extends in the main scanning direction. an illumination light source 12 that irradiates the document surface with light through the slit window 13, and an optical lens 1 that forms an image of the light reflected from the document surface l.
4. A control board 16 in which COD and other line sensors 15 are arranged at the image forming position of the optical lens 14, and various memories and control ICs are incorporated along the inner wall surface of the mounting body 10 surrounding them. is installed.

Since these are well known, detailed descriptions of their structures will be omitted.

A circular hole 101 for rolling the mouse balls IIA and IIB is bored in the bottom of the holder located on both sides of the slit window 13 in the longitudinal direction, and the center of the circular hole 101 is located at the center of the slit. It is configured to coincide with the main scanning line of the window 13.

and a case 10A for storing the ball 11AjlB.

The schematic structure of the casing 10B will be explained based on FIG.
A circular recess 103 is formed on the inner surface of the mounting body 10A facing the top so that the balls IA and JIB are not pressed against the document surface by more than a predetermined pressure, and the ball IIA is rotatably supported in the recess 103. An LED 105 is installed in the recess 103 via a spring 104, which lights up when the ball IIA is pressed against the document surface with a predetermined pressure, and transmits the signal to the control circuit 20 side, which will be described later. .

Further, as shown in FIG. 1, a pair of roller members 21Y and 21X are rotatably attached to the balls IIA and 11B at positions 90 degrees apart for detecting rolling displacement in the X-Y two-axis directions. and the roller member 21Y.

The amount of rotational displacement of 21X is detected through an encoder or other detection mechanism, and the detection signal is transmitted to the signal generation circuit 24 and the position information calculation circuit 25 for predetermined calculation processing.

Next, the operation of this embodiment will be explained based on FIGS. 4 and 3.

First, as shown in FIG. 3, after placing the handy scanner at the reading start position, both the balls IIA are placed.

When the pressure contact state of 11B is normal, the L E D 1
An ON signal is generated from 05, and AND circuits 28A, 2
8B, the ON signal and the energization signal from the switch SW are ANDed and the image reading operation is started.

If the pressure contact between the balls IIA and IIB separates during the reading operation, the positional information from the balls IIA and 11B becomes inaccurate, so the buzzer 29 is sounded to stop the image reading.

When the image reading operation starts again, the pair of circular holes 10 located on the main scanning line of the line sensor 15
In the control circuit 20, based on the positional information of the X-Y component at the center, the slope amount (
Calculate a) and constant (b).

The pitch movement amount P of the distance between the center points of the line sensor 15 is determined according to the function, and a synchronization signal for image reading is generated within the signal generation circuit 24 at each predetermined pitch interval.

Based on the synchronization signal, the image guided onto the line sensor 15 is read at predetermined pitch intervals.

Next, the position arithmetic circuit 25 performs arithmetic processing, which will be described later, based on the positional information of each dot position from the above-mentioned functional formula and the above-mentioned synchronization signal.

For example, when a video memory 26 with an XY address is provided in the control circuit 20, it is calculated at which address position 26A of the square 26B the line pixel is located based on the XY position information. The line pixels are dot-inputted for each corresponding address position.

As shown in FIG. 5, the handy scanner is moved parallel to the sub-scanning direction or the main scanning direction or rotated along the document surface to scan the entire document surface, thereby scanning a wide range of documents. The image information corresponding to the area is stored in a dot pattern in the video memory 26 having the squares 26B designated by the address 26A, as shown in FIG. 4(b).

The image information thus stored in the video memory can be integrated or transferred to another printer or OCR via a communication line, if necessary.

"Effect J" As described above, according to the present invention, even when the image reading device is moved freely in the , it is possible to read images with high precision.

Further, the present invention is not restricted by the spatial area sandwiched between a pair of moving members that move and scan the document surface, and can perform accurate image reading even when a wide area of the document surface is freely scanned.

It has various effects such as

[Brief explanation of drawings]

1 to 5 show a handy scanner according to an embodiment of the present invention, FIG. 2 is an overall perspective view, FIG. 3 is a perspective view of the main part of the mouse portion, FIG. 1 is a circuit block diagram thereof, and FIG. Diagram (a)
indicates the address positional relationship of the reading unit during manual scanning, and (
b) is a graph diagram showing the data storage state in the memory, No. 5
The figure is an action diagram showing a manual scanning state. Figure 2

Claims (1)

[Scope of Claims] 1) In a manual image reading device configured to be able to read a document image guided onto a line sensor at predetermined pitch intervals while manually scanning along the document surface, the main scanning direction of the line sensor is Position detecting means capable of acquiring X-Y component position information by following the manual scanning are arranged at at least two points, respectively, and the two-component position information respectively obtained from the position detecting means is calculated. 2) A manual image reading device characterized in that the reading pitch interval of the line sensor can be set by the manual image reading device 2) Reading the original image guided onto the line sensor at a predetermined pitch interval while manually scanning along the original surface. In the manual image reading device configured to be able to read the original, at positions on both sides in the main scanning direction of the original reading slit opening facing the original surface,
A manual image reading device having a positional information detecting means for X-Y components consisting of a sphere and configured so that the sphere can roll on the document surface following the manual scanning 3) Manual scanning along the document surface In a manual image reading method in which a document image guided onto a line sensor is read at predetermined pitch intervals, X-Y component position information at at least two points located in the main scanning direction of the line sensor is obtained. 4) An image reading method characterized by continuously acquiring an image from a reading start position to an end position during manual scanning, and setting a reading pitch interval of the line sensor based on the acquired position information. At least a pair of spheres are arranged so as to be able to roll on the document surface at positions on both sides in the main scanning direction of the facing document reading slit openings, and the spheres are separated from the document surface from the image reading start position to the end position during manual scanning. The image reading method according to claim 3), characterized in that the line sensor is caused to continuously roll and the reading pitch interval of the line sensor is set based on the positional information of the X-Y component detected by the rolling.