JPH04207756A - Original stationary type reader - Google Patents

Abstract

PURPOSE:To automatically discriminate the read effective area of a transmitted original by making the reflection of the upper surface part of an original platen different from the reflection of the original and calculating effective length in the main scanning direction of the original based on the state of white data and black data out of the image data of one line. CONSTITUTION:A master control part 1 controls a mechanism control part 23 to move the scanner part 21 of an original stationary type reading part 2 in a subscanning direction so as to perform a maximum width reading action in the main scanning direction, and the image data obtained in such a way is stored in a line memory 3. Since the upper surface of the original platen 1 is made of a member which is difficult to optically reflect, the master control part 1 recognizes the state of the white data and the black data out of the image data inputted in the line memory 3 and calculates the effective width (b) of the original 10 by noticing a part where the black data is consecutively obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Industrial Field of Application) The present invention relates to a stationary document reading device installed in a facsimile machine that can read and transmit a document while it is stationary.

(Prior Art) In the conventional stationary document reading device installed in this type of facsimile machine, when a document is placed face up on a document table, a scanner section moves over the stationary document in the sub-scanning direction.
Image data can be obtained by reading the contents of the document. However, conventional static document reading devices of this type do not have a function to automatically determine the effective reading area of the scanned document. had to be set in the department.

For example, if the size of the document to be read is A4, the operator sets the document reading area to A4 on the stationary document reading section by pressing a button on the operation panel section that specifies the A4 size. do. As a result, the stationary document reading unit reads the specified width and length range of the A4 size document and obtains image data.

1- However, in the method described above in which the operator sets the effective scanning area of the scanned original, the wrong size may be set, and in such cases, a part of the scanned original may not be sent, or This method has the disadvantage that unnecessary portions are read and sent away during transmission, resulting in a longer transmission time.

As mentioned above, if the scanning effective area of the scanned document is set to only standard format, the width of the scanned document may be A4 depending on the document.
However, the length of the document to be read may be longer than A4 size, and in such cases, if A4 size is set as the effective reading area on the static reader, a part of the document in the longitudinal direction may not be read. There was a drawback that the original would be sent with this part missing.

Therefore, it is conceivable to set a large number of valid reading areas of the scanned document other than the standard sizes mentioned above, but this requires registering the valid reading areas of many sizes in the device in advance, which requires a lot of time and effort. In addition, there are drawbacks such as the need to increase the memory capacity of the registration destination.

(Problems to be Solved by the Invention) As described above, in a facsimile machine having a stationary document reading device, the operator does not have to set the effective reading area of the transmitted document to the reading section from the operation panel section etc. for each transmitted document. This poses a disadvantage that not only does this place an operational burden on the operator, but also that if an operational error occurs, part of the document to be sent will not be sent.

SUMMARY OF THE INVENTION The present invention aims to eliminate the above-mentioned drawbacks, and aims to provide a stationary document reading device that can automatically determine the effective reading area of a transmitted document and read the document.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a stationary document reading device in which a scanner unit scans a stationary document to obtain image data, in which an upper surface portion on which the document is placed has a reflectance of the document. a document table having a reflectance different from that of the document table, and a storage means for holding one line of image data obtained by scanning the document placed on the document table with a maximum width in the main scanning direction with the scanner unit; a calculation means for calculating the effective length of the document in the main scanning direction from the state of white data and black data of the one line of image data held in the storage means; and a calculation means that moves in the sub scanning direction together with the scanner section. a sensor means for receiving reflected light from the document table and the document, and a detection means for detecting the effective length of the document in the sub-scanning direction based on a change in the light reception level of the sensor means; It has a configuration that outputs image data of an area determined by the effective length of the document detected and calculated by the calculation means.

(Function) In the stationary document reading device of the present invention, the upper surface portion of the document table on which the document is placed has a reflectance different from that of the document. The storage means stores image data corresponding to one in, which is obtained by scanning the document placed on the document table with a maximum width in the main scanning direction using a scanner section. The calculation means calculates the effective length of the document in the main scanning direction from the state of white data and black data of the one line of image data held in the storage means. The sensor means moves in the sub-scanning direction together with the scanner section and receives reflected light from the document table and the document. The detection means detects the effective length of the document in the sub-scanning direction based on a change in the level of light received by the sensor means. Image data of an area determined by the effective length of the document detected and calculated by the detection means and the calculation means is output.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a block diagram showing an embodiment of a facsimile machine equipped with a stationary document reading device of the present invention. Reference numeral 1 denotes a main control unit that controls individual controls such as transmission/reception control and the overall control of the apparatus; 2 a stationary document reading unit that reads a transmitted document, etc. and converts it into image data; a scanner unit 21; a reflection sensor 22; and a mechanism. A line memory 3 stores the image data read from the static manuscript reading section 2 line by line, and 4 stores the image data read by the scanner section 21 in an image format suitable for a facsimile machine. or an image converting section for converting into linear density; a code/decoding section for encoding and decoding the image data; 6 an input section for inputting a dial number or various mode settings; 7 a dial number or various operation data, etc. 8 is a recording section that records received image data on paper, and a transmission section that captures a line (not shown) and modulates or demodulates the image data and transmits or receives the image data.

Here, the line memory 3 constitutes a storage means, the main control section 1 constitutes a calculation means and a detection means, and the reflection sensor 22 constitutes a sensor means.

Here, the scanner section 21 scans a stationary document to obtain image data, and the reflection sensor 22 scans the document table together with the scanner section 21 and receives light reflected from the document table. The mechanism control section 23 controls the drive of the scanner section 21 and the like, and controls the blinking of the light source for optical reading. Note that the stationary document reading section 2, the main control section 1, and the line memory 3 constitute a stationary document reading device.

FIGS. 2A and 2B are diagrams showing a detailed side view and a top view of the stationary document reading section 2. FIG. A reflective sensor 21 is attached to the scanner section 21.

The scanner unit 21 moves in the sub-scanning direction (in the direction of the arrow in the figure) over the original 10 placed face up on the original platen 11, photoelectrically converts the written contents of the original into image data.

Next, the operation of this embodiment will be explained. First, the operator places the transmission document 10 on the document table 11 shown in FIG. Thereafter, when the same operator inputs destination dial information from the input section 6, the transmission section 9 sends a dial signal corresponding to the input dial information onto a line (not shown). During this time, the main control section 1 controls the mechanism control section 23 to operate the scanner section 21 of the stationary document reading section 2 in the sub-scanning direction, and the reflection sensor 22 receives the reflected light as shown in FIG. When the camera reaches position 1, which is a little closer to the document side than position A, the maximum reading operation is performed in the main scanning direction, and the image data obtained thereby is stored in the line memory 3.

Here, as shown in FIG. 4, since the upper surface of the document table 11 is made of a material that does not reflect optically as shown by diagonal lines, image data as shown in FIG. 3 is input to the line memory 3. . The main control unit 1 controls the third
The effective width of the document 10 is calculated by recognizing the state of white data and black data of the image data as shown in the figure and focusing on the part where black data is continuously obtained as shown in part a. do. That is, since the width d of the document table 11 is known, b=d−a. In reality, the scanner unit 21 performs the above operation over several lines, calculates the effective width for each line of image data obtained each time, and selects the largest effective width among them as the actual width of the original 10. As the width,
Remember this.

After that, when the destination and the line are connected by the transmission section 9,
The main control unit 1 activates the mechanism control unit 23 of the stationary document reading unit 2 to start reading the document 10.
First, the scanner section 21 is moved to the left. At this time,
The level of the light reception signal input from the reflection sensor 22 is the fourth level.
As shown in Figure (B), it has a characteristic that it is initially low, becomes high at the document 10 portion, and then becomes low again after passing the document 10 portion.

Therefore, the mechanism control section 23 controls the scanner section 21 to move only in the sub-scanning direction corresponding to the period when the light reception signal inputted from the reflection sensor 22 is high. Of the image data read from the line memory 3 through the line memory 3, only the portion corresponding to the above-mentioned effective width is made valid and sent to the image conversion section 4.

The image converter 4 converts the document width and line density of the input image data into values suitable for facsimile transmission and outputs them to the encoder/decoder 5. The encoder/decoder 5 encodes the input image data. When the encoded data is then sent to the transmission section 9, the transmission section 9 modulates the input encoded data and sends it out on a line not shown.

According to this embodiment, by utilizing the difference in optical reflection characteristics between the original 10 portion placed on the original table 11 and the original table 11,
Since the effective range of the original 10 in the main scanning direction and the sub-scanning direction can be automatically detected and the written contents of the original 10 can be read, it is possible to prevent scandals such as a part of the original 10 not being read and not being sent. can. Further, unlike the conventional method, it is not necessary for the operator to manually set the effective area of the document, thereby reducing the burden on the operator and improving the operability of the apparatus.

Incidentally, when the original 10 is placed on the original platen 11 as shown in FIG. 5, image data as shown in FIG. 6 is held in the line memory 3. In such a case, the main control unit 1 sets b=d
-(a=-c) can be calculated to calculate the effective reading base of the original 10 in the main scanning direction, so the degree of freedom in the placement of the original 10 is higher than before, and the [Effects of the invention J that can improve the operability of the device] As described above, according to the static manuscript reading device of the present invention, it is possible to automatically determine the effective reading area of a transmitted manuscript and read the manuscript. I can finish it.

[Brief explanation of the drawing]

Fig. 1 is a professional drawing showing an embodiment of a facsimile machine equipped with a stationary original reading device of the present invention, and Fig. 2 shows a detailed example of the stationary original reading section shown in Fig. 1. 3 is a diagram showing an example of image data held in the line memory shown in FIG. 1, and FIG. 4 is an example of placing an original on the stationary manuscript reading section shown in FIG. Figure 5 is a diagram showing an example of light reception data of the sensor, Figure 5 is a diagram showing another example of document placement in the stationary document reader shown in Figure 1, and Figure 6 is a diagram showing an example of document placement in the stationary document reader shown in Figure 5. FIG. 2 is a diagram showing an example of image data held in the line memory shown in FIG. 1 when the line memory is installed. 1... Main control section 2... Original stationary reading section 3... Line memory 4... Image converting section 5... Code decoding section 6... Input section 7... Display section 8 ...Recording section 9...Transmission section 21...Scanner section 22...Reflection sensor 23...Mechanism control section agent Patent attorney Book 1) Takashi 1st figure 22 斥J←訃hindsa ? 141 and 744 in Figure 2←-d. Figure 3 A Figure 4

Claims (1)

[Claims] In a stationary original type reading device in which a scanner unit scans a stationary original to obtain image data, the original is placed on an original stand, the top surface of which the original is placed on, having a reflectance different from that of the original; storage means for holding one line of image data obtained by scanning the placed original in the main scanning direction with the maximum width; and a white space of the one line of image data held in the storage means calculation means for calculating the effective length of the document in the main scanning direction from the state of data and black data; and sensor means that moves in the sub-scanning direction together with the scanner section and receives reflected light from the document table and the document. , a detecting means for detecting the effective length of the original in the sub-scanning direction based on a change in the light reception level of the sensor means, and the effective length of the original is determined by the effective length of the original detected and calculated by the detecting means and the calculating means. What is claimed is: 1. A stationary document reading device that outputs image data of a captured area.