JPH1188654A - Original deviation correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an output image without protruding an image from a copying paper, even when an original is placed while being deviated in a copying area on contact glass by centering and correcting a read image so as to be settled within the copying area. SOLUTION: An image area detecting means 104 investigates an image memory 103 and detects an image area by detecting first and final positions of pixels which are existent in respective X-axis and Y-axis directions. A copy area designating means 106 calculates the copy area in the image memory 103 from the size of paper set by a paper setting means 105 and the image area detected by the image area detecting means 104. Based on a value found by the copy area designating means 106, an image output means 107 reads image data from the image memory 103 and outputs them. Thus, the image is centered to the paper set by the paper-setting means 105, and then output.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine, and more particularly to an apparatus for detecting whether a document is out of alignment with an image reading means and correcting the original.

[0002]

2. Description of the Related Art FIG. 7 shows a system diagram of a conventional digital copying machine.

A conventional copier includes a scanner unit 701, a laser writing unit 702, a polygon mirror 703, and a photosensitive drum 704. Image data read by the scanner unit 701 is electrically processed and then processed by a laser oscillator. An image is formed on the photoconductor 704 via a polygon mirror or the like. As the image forming means, various systems such as an LED system other than the laser can be considered. The image on the photoconductor 704 is developed, transferred to a sheet fed from a sheet feeding device 705, and finished as a copy.

In a conventional copying machine, when performing a copying process, an original is set at a predetermined position by using an original scale (printed on a paper size or the like) disposed at the end of a contact glass, and a copying operation is performed. I was doing.

FIG. 4A shows a scan area 411 on a contact glass, a copy area 412, and a document 413.
It is an example showing the positional relationship of. The original 413 must be aligned with the copy area 412. However, when the original is set quickly or when the original cover is closed, the original shown in FIG.
It is often the case that the image is shifted from the copy area 412 as shown in FIG. If the copying is performed without noticing such a shift of the original, a copy as shown in FIG.

If an original 811 as shown in FIG. 8A is to be copied onto a sheet larger than the original,
It is common to copy as shown in FIG. 8C when enlarging as shown in FIG. 8B, and it is very difficult to copy in the center as shown in FIG. 8D.

Japanese Patent Application Laid-Open No. 4-32 discloses an image forming apparatus in which a document is displaced from a contact glass.
Japanese Patent Application Laid-Open No. 9755 is not always able to use a sheet size desired by an operator as a copy sheet.

[0008]

In the case of FIG. 4B described in the background art, not all of the original is copied, and the larger the displacement of the original, the greater the loss of the original image. Become.

[0009] Depending on the size of the defect, there is a problem that copying is wasted, and there is a loss in both economical and temporal aspects.

The present invention has been made in view of the above circumstances, and detects whether or not a document to be copied is shifted with respect to a copy area.
The first purpose is to set a copy area according to the deviation, the second purpose is to obtain a copy of FIG. 8D from the original 811 in FIG. 8A, and the paper size desired by the operator is output. The third purpose is to use as paper.

Further, when the entire image cannot be copied only by setting the copy area, for example, when an A4 original is to be copied on B5 paper, the image stored in the storage means is processed and the image is stored in the copy area. The purpose is to correct it to fit.

[0012]

According to a first aspect of the present invention, there is provided a document misalignment correction apparatus, comprising: an image reading unit; an image processing unit configured to process an image read by the image reading unit; and storing the processed image. Storage means, an image area detection means for detecting an image area from the storage means, a paper setting means for setting a paper size, and a copy area designation for designating a copy area by an output of the image area detection means and the paper setting means Means for correcting a document misalignment, wherein the read image is centered in a copy area and corrected to fit.

According to a second aspect of the present invention, in the document deviation correcting apparatus, second image processing means for performing image processing on the image stored in the storage means so as to match a sheet size is added. Item 2 is a document misalignment correction device.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an example of a block diagram for solving the problem of the first aspect. FIG. 2 is a PAD diagram showing the flow of processing in the block diagram of FIG.

The operator places the original 413 in the copy area 4
At this time, it is assumed that the original is shifted as shown in FIG. 4A for some reason.

The image reading means 101 reads all the images in the scan area 411 on the contact glass (202), and outputs the images to the image processing means 102.

The image processing means 102 processes the image (shading correction, error diffusion, etc.) (203), and
Value and output the image to the image memory 103 (20
4). The image area detecting means 104 examines the image memory 103, detects the positions of the first and last pixels in each of the X-axis and Y-axis directions (205), and outputs the detection result to the copy area specifying means 106.

The detection method of the image area detecting means 104 will be described below.

FIG. 3 is a PAD diagram for detecting an image area.

After the initial setting (301), the image memory 10
3 is scanned from the 0th row to the last row in the Y-axis direction (302), during which scanning is performed from the 0th column to the last column in the X-axis direction (304), and furthermore, pixels in the memory are detected during that time (304). 306) If a pixel is detected and a pixel is detected for the first time in the X-axis direction (308), the current column is substituted for Xs (311). Also, the current column is substituted for Xe every time it is detected (310). Substitution is performed in exactly the same way for Ys and Ye. As a result, the positions of the first and last pixels appearing in both the X-axis direction and the Y-axis direction are known, and the image area can be detected.

The copy area designating means 106 designates a copy area of the image memory 103 from the size of the paper set by the paper setting means 105 and the image area detected by the image area detecting means 104 (206). Is output to the image output means.

Hereinafter, a method of specifying a copy area by the copy area specifying means 106 will be described. When the operator sets the size of the output paper in the paper setting means 105, the width (Xs, Xe, Y obtained earlier) that can be output to the image output means 107 in the X-axis and Y-axis directions of the image memory from the paper size.
s and Ye). This width is expressed in the X-axis direction X
Let L and Y directions be YL. On the other hand, the image area is also detected by the image area detecting means 104 as described above. Here, the copy area designation means 106 calculates the following equation: XMs = Xs − ((XL− (Xe−Xs)) / 2)... Expression 2 YMs = Ys-((YL- (Ye-Ys)) / 2) Expression 3 YMe = Ye + ((YL- (Ye-Ys)) / 2) Expression 4 The copy area of the memory 103 is calculated and output to the image output unit 107.

The image output means 107 reads image data from the image memory 103 based on the value obtained by the copy area designation means 106 and outputs it (207).

The output result of the image output means 107 is shown in FIG.
(C) and FIG. 8 (D).

Copy area 4 on conventional contact glass
4A and 8A, the image is set by the paper setting means 105 as shown in FIGS. 4C and 8D. It can be output centered on paper.

(Embodiment 2) With respect to Formulas 1 to 4 described in Embodiment 1, at least one of XL <(Xe-Xs) ... Formula 5 YL <(Ye-Ys) ... Formula 6 When the condition is satisfied, that is, when the image read by the image reading unit 101 is
Consider a case where the paper set in step 5 does not fit.

In this case, it can be easily inferred from Expressions 1 to 4 that an image output result cannot be obtained correctly. Hereinafter, this case will be described.

FIG. 5 is a diagram in which the image reducing means 501 is added to FIG. 1, and FIG. 6 is a PAD diagram showing the flow.
The image reduction means 501 rewrites the image memory so as to satisfy XL = (Xe−Xs) + α (Equation 7) YL = (Ye−Ys) + β (Equation 8) Where α, β
Is an arbitrary number, and represents how much margin is left at the edge of the sheet, and has the following relationship: α <XL... Equation 9 β <YL.

The reduction processing performed by the image reduction means 501 includes a primary interpolation method.

The percentage by which the image reduction means 501 must reduce the image is as follows: reduction ratio in the X direction = ((XL−α) / (Xe−Xs)) × 100% formula 11Y Reduction ratio in direction = ((YL−β) / (Ye−Ys)) × 100% Reduction is performed according to the smaller reduction ratio of Expression 12. However, this does not apply unless the output image needs to be similar to the document image.

In this embodiment, the image reduction processing means 501 rewrites the image memory 103 (604), but inserts the image reduction processing means 501 while the image memory 103 sends image data to the image output means 107. A similar result is obtained.

[0033]

According to the first aspect of the present invention, even if the original is shifted with respect to the copy area on the contact glass corresponding to the conventional copy sheet, the copy sheet set by the operator can be used. The image does not protrude, and the centering is further performed to obtain an output image.

According to the second aspect of the present invention, even when the copy paper set by the operator is smaller than the original image, the image is reduced by the image reduction means so as to fit on the set paper and the image is output. Thus, the image does not fit on the setting paper.

[Brief description of the drawings]

FIG. 1 is a block diagram of the present invention (claim 1).

FIG. 2 is a PAD diagram of the present invention (claim 1).

FIG. 3 is a PAD diagram of image area detection.

FIG. 4A illustrates a positional relationship among a scan area, a copy area, and a document. FIG. 6B is a diagram illustrating an example of a copy failure. (C) is a diagram showing a relationship between a copy success example and a coefficient.

FIG. 5 is a block diagram of the present invention (claim 2).

FIG. 6 is a PAD diagram of the present invention (claim 2).

FIG. 7 is a schematic diagram of a digital copying machine.

FIG. 8A illustrates a positional relationship among a scan area, a copy area, and a document. FIG. 6B is a diagram (part 1) illustrating an example of copying in the related art. FIG. 2C is a diagram (part 2) illustrating an example of copying in the related art. (D) is a diagram showing a copying example according to the present invention.

[Explanation of symbols]

 101 Image reading means 102 Image processing means 103 Image memory 411 Scan area 412 Copy area 413 Original

Claims (2)

[Claims] 1. An image reading means, an image processing means for processing an image read by the image reading means, a storage means for storing the processed image, and an image for detecting an image area from the storage means Area detecting means, paper setting means for setting a paper size, and copy area designating means for designating a copy area based on the output of the image area detecting means and the paper setting means, wherein the read image is centered on the copy area. An original misalignment correction device that corrects to fit. 2. An image stored in the storage means,
2. The apparatus according to claim 1, further comprising a second image processing means for performing image processing so as to match a sheet size.