JPH0530286A - Picture reader - Google Patents

Abstract

PURPOSE:To obtain a read original whose length is equal to the actual length of an original by outputting the binarized picture signal of a preceding line in a line memory storing tentatively the output of a read section when the subscanning speed of the read section exceeds a specified speed. CONSTITUTION:A read section 1 reads picture information of an original with line scanning and outputs a picture signal corresponding to the picture information in the unit of lines, a picture processing binarizing section 2 implements picture processing to the picture signal and binarizes the signal and outputs it. The output is fed to a line memory 3, in which the signal is stored in the unit of lines. A subscanning speed of the read section 1 monitored by a speed monitor section 4 is fetched by a control section 50, which controls the write/ read of the binarizing picture signal of the line memory 3. When the subscanning speed of the read section 1 exceeds a specified speed and the subscanning distance within the main scanning time exceeds two lines, the write of the binarizing picture signal to the line memory 3 is not implemented but the binarized picture signal of the preceding line stored in the line memory 3 is read.

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 for performing sub-scanning by manually moving an image reading unit on a document, and more particularly to eliminating line omission when the moving speed of the image reading unit is faster than a predetermined speed. The present invention relates to an image reading device that is designed to prevent the above.

[0002]

2. Description of the Related Art Conventionally, an apparatus shown in FIG. 3 has been known as an image reading apparatus for performing sub-scanning by manually moving an image reading unit on a document. This device is configured such that the reading device 11 can be removed from the facsimile main body 10, and the reading device 11 capable of line scanning is used as the original document 1.
The sub-scanning is performed by manually scanning the scanning device 2 to obtain read image information to be input from the reading device 11 to the facsimile main body 10.

By the way, in such a device, since the sub-scan is manually performed, if the moving speed of the reading device 11 is slower than the main scanning speed of the reading device 11, the same line is read twice. Therefore, the length of the read document becomes longer than the actual length of the document. Therefore, in the conventional apparatus, the reading device 11 is provided with a roller 11a for detecting the moving speed of the reading device 11, and the moving speed of the reading device 11 is monitored from the rotation speed of the roller 11a.
If the reading device 11 does not reach the specified movement amount, for example, 7.7 mm when reading one line per 7.7 mm in the specified one-line main scanning time of 1, the movement amount of the reading device 11 will be 7 mm. It is configured so that the output of the read image information of the next line from the reading device 11 is prohibited until it reaches 0.7 mm.

FIG. 4 shows an example of an image information processing circuit of a conventional apparatus having such a configuration. In FIG. 4, the reading unit 1 corresponds to the reading device 11 shown in FIG. 3, and is composed of, for example, a CCD that reads image information of a document by line scanning, and outputs an image signal corresponding to this image information on a line-by-line basis. To do. This image signal is applied to the image processing binarization unit 2, where image processing such as shading correction and enhancement correction is performed and binarized.

On the other hand, the sub-scanning speed of the reading unit 1, that is, the moving speed of the reading device 11 is monitored by the speed monitoring unit 4 based on the rotation speed of the roller 11a arranged in the reading device 11, and the sub-scanning of the reading unit 1 is performed. When the speed is equal to or lower than the specified moving speed, the control unit 5 detects this, the gate 6 is closed, and the output of the image processing binarization unit 2 is set so that the sub-scanning distance of the reading unit 1 reaches the specified distance. Configured to stop until.

As described above, in the conventional apparatus, when the sub-scanning speed by the reading unit 1 is slower than the specified speed, double reading of the same line is prohibited, and a read original having the same length as the actual original is obtained. Be done.

However, in such a conventional device,
When the sub-scanning speed by the reading unit 1, that is, the moving speed of the reading device 11 is too high compared to the main scanning speed of the reading device 11, a line of missing reading occurs, which causes a line omission and the length of the read original. However, the length of the original becomes shorter than the actual length of the original.

[0008]

As described above, in the conventional image reading apparatus, no problem occurs when the moving speed of the image reading unit is slower than the specified speed, but the moving speed of the image reading unit is specified. When the speed exceeds the speed and is too fast, a line is missed, which causes a line omission, which causes the length of the read document to be shorter than the actual length of the document.

Therefore, the present invention provides an image reading apparatus capable of obtaining a read original having the same length as the actual original even when the moving speed of the image reading unit exceeds the prescribed speed and is too high. The purpose is to

[0010]

In order to achieve the above object, the present invention provides an image reading apparatus for reading an image on a document by sub-scanning by manually moving the image reading unit on the document. A storage unit for temporarily storing image information read by the image reading unit is provided, and when the moving speed of the image reading unit is faster than a certain speed determined corresponding to the main scanning time of the image reading unit, the storage is performed. The image information of the previous line stored in the means is output.

[0011]

When the moving speed of the image reading unit is faster than the constant speed determined in correspondence with the main scanning time of the image reading unit, the image information of the previous line stored in the storage means is output. As a result, even if the moving speed of the image reading unit is too fast, a read original having the same length as the actual original can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of an image reading apparatus according to the present invention. 1, the reading unit 1, the image processing binarization unit 2, and the speed monitoring unit 4 have the same functions as the reading unit 1, the image processing binarization unit 2, and the speed monitoring unit 4 of the conventional apparatus shown in FIG. For the sake of convenience of explanation, the same reference numerals as those used in FIG. That is, the reading unit 1 corresponds to the reading device 11 shown in FIG. 3, and is composed of, for example, a CCD that reads image information of a document by line scanning, and outputs an image signal corresponding to this image information on a line-by-line basis. .. Also,
The image processing binarization unit 2 inputs the image signal output from the reading unit 1, performs image processing such as shading correction and enhancement correction on the image signal, and binarizes and outputs the image signal. The speed monitoring unit 4 detects the moving speed of the reading device 11 based on the rotation speed of the roller 11a arranged in the reading device 11 shown in FIG. 3, and thereby monitors the sub-scanning speed of the reading unit 1. ..

The binarized image signal output from the image processing binarization unit 2 is added to the line memory 3 and stored in line units. Here, the line memory 3 has a storage capacity for one line.

On the other hand, the reading unit 1 monitored by the speed monitoring unit 4
The sub-scanning speed of 1 is taken into the control unit 50, which controls the writing and reading of the binary image signal of the line memory 3. That is, the sub-scanning speed of the reading unit 1 is substantially equal to the specified speed, and the reading unit 1 has a speed of 7.7 m
When reading one line per m, the sub-scanning distance of the reading unit 1 within the main scanning time of the reading unit 1 is 1 line to 2 lines, that is, 7.7 mm to 7.
In the case of 7 × 2 mm, the binarized image signal output from the image processing binarization unit 2 is written in the line memory 3, and at the same time, the binarized image signal is read from the line memory 3. When the sub-scanning speed of the reading unit 1 is lower than the specified speed and the sub-scanning distance of the reading unit 1 within the main scanning time of the reading unit 1 does not reach one line, that is, 7.7 mm, the reading unit 1 It is prohibited to write the binarized image signal output from the image processing binarization unit 2 into the line memory 3 until the sub-scanning distance of 7 reaches 7.7 mm, and the binarized image signal is not written into the line memory 3. When it is started, the reading of the binarized image signal from the line memory 1 is started. If the sub-scanning speed of the reading unit 1 exceeds the specified speed and the sub-scanning distance of the reading unit 1 within the main scanning time of the reading unit 1 exceeds 2 lines, that is, 7.7 × 2 mm, 2 Writing the binarized image signal to the line memory 3 is not performed,
The binarized image signal of the previous line stored in the line memory 3 is read.

This control will be further described with reference to the flowchart of FIG.

When the reading unit 1 completes reading of one line (step 101), the reading unit 1 reaches the specified amount, that is, 7.7 mm when reading one line per 7.7 mm. (Step 102), it is checked whether the read line is the first line (Step 103), and if it is the first line, the contents of the line memory 3 are updated by the output of the image processing binarization unit 2 (Step 106). The updated contents of the line memory 3 are output (step 10
7).

Then, it is checked whether the page is finished (step 10
8) If it is not the end of the page, the process returns to step 101 to read the next line, and when the sub-scan amount reaches the specified amount in the reading unit 1 (step 102), the reading line is set to 1 next.
It is checked whether it is the line (step 103). In this case 1
Since it is not on the line, the sub-running speed of the reading unit 1 is monitored (step 104), and from the output of the speed monitoring unit 4, the sub-running speed of the reading unit 1 is the specified speed, that is, the main scanning time of the reading unit 1. It is checked whether or not the sub-scanning distance of the reading unit 1 exceeds the speed of 2 lines (step 105). here,
When the sub-running speed of the reading unit 1 is within the specified speed, the contents of the line memory 3 are updated by the output of the image processing binarization unit 2 (step 106), and the updated contents of the line memory 3 are output ( Step 107).

However, if it is determined in step 105 that the secondary running speed of the reading unit 1 exceeds the specified speed, the contents of the line memory 3 are not updated by the output of the image processing binarization unit 2, and the process proceeds to step 107. After the shift, the binarized image signal of the previous line stored in the line memory 3 is output.

This operation is repeated until it is determined in step 108 that the page has ended, and when it is determined in step 108 that the page has ended, this image reading process ends.

As described above, in this embodiment, the binarized image signal of the previous line stored in the line memory 3 is output when the sub-running speed of the reading unit 1 exceeds the specified speed. It is possible to output an image signal of a fixed number of lines regardless of the sub-running speed, and it is possible to obtain a read original having the same length as the actual original.

In the above embodiment, 7.7 mm
I mentioned the case of reading one line per
It goes without saying that the same applies to other scanning line densities.

[0023]

As described above, according to the present invention, the image information of the preceding line is output when the sub-running speed of the image reading unit exceeds the specified speed. Regardless of the running speed, it is possible to obtain a certain number of lines of image information, and it is possible to obtain a read document having the same length as the actual document.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an image reading apparatus of the present invention.

FIG. 2 is a flowchart for explaining the operation of the embodiment shown in FIG.

FIG. 3 is an explanatory diagram showing a schematic configuration of an image reading apparatus to which the present invention is applied.

FIG. 4 is a block diagram showing a conventional image reading device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 reading unit 2 image processing binarizing unit 3 line memory 4 speed monitoring unit 5 control unit 6 gate 10 facsimile main body 11 reading device 11a roller 12 original document 50 control unit

Claims (1)

Claim: What is claimed is: 1. An image reading apparatus for reading an image on an original by performing sub-scanning by manually moving the image reading unit on the original, and image information read by the image reading unit. When a moving speed of the image reading unit is faster than a certain speed determined corresponding to the main scanning time of the image reading unit, the image of the previous line stored in the storing unit is provided. An image reading device characterized by outputting information.