JPH04319862A - Method for correcting original image for distorted original - Google Patents

Abstract

PURPOSE:To evade a case where an original surface edge or a background surface is printed by reading directly an original surface part set in a reference area of the original width and replacing an protruding part with the same data as that on the background surface. CONSTITUTION:An original 1 is sequentially scanned and read in the horizontal direction toward the lower side from the upper side even if the original 1 is set in the distorted state to the reference areas E' and E of the vertical and horizontal widths accordant with the vertical and horizontal dimensions of the original 1. Then the parts protoruding from both areas E' and E are replaced with the same data as that on a backgroud surface when the original 1 is sequentially and horizontally scanned and read at the prescribed intervals. Meanwhile the original surface parts stored in the areas E' and E are directly processed as the effective original data. At the same time, the original surface parts omitted in the areas E' and E are replaced with the full white data equal to the background information on the original surface.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for correcting a document image to prevent edges and background surfaces from appearing when a document is set in an image reading section or the like in a distorted state and the read document is printed. .

0002

[Prior Art] When transmitting original data or copying by facsimile, it is necessary to correctly set the original in an image reading section so that the horizontal scanning line is perpendicular to the edge of the original. If the setting position is distorted diagonally, not only will the original characters printed on the recording paper be printed diagonally, but also black streaks will occur due to the edges of the original in the printed image obtained by printing the original. Alternatively, if the background surface of the document is black, as shown in FIG. 4, the black background surface B is included in the recording paper P on which the document characters A are printed, causing a reduction in image quality during printing. .

0003

[Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a simple method for printing images even when the original is read and scanned without being set in the correct position. It is an object of the present invention to provide a method for correcting an original image that prevents the occurrence of black streaks or background surfaces due to the edges of the original surface.

0004

[Means for Solving the Problems] The method of the present invention proposed to achieve the above object adopts a method of horizontally scanning a document at predetermined intervals and processing the document data read for each line. The processing procedure is to replace the missing parts of the document surface located within the standard area of the document width with all-white data that is the same as the background information of the document surface, out of the document surface data read line by line. The document surface portion located within the width reference area is read as is, and the document surface portion extending outside the document width reference area is replaced with the same data as the background surface.

[0005]

[Operation] According to the method of the present invention, when a document is horizontally read and scanned line by line, the missing portion of the document surface located within the reference area of the document width is filled with all-white data that is the same as the background information of the document surface. The part of the original data that protrudes from the standard area of the original width is replaced with the same data as the background surface, so even if the original is set in the image reading unit in a distorted state, the printed image of the original will be replaced with the same data as the background. Black lines caused by the edges of the document surface and images on the background surface are removed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be explained below with reference to the accompanying drawings. Figure 1 shows that the document 1 with the letter "A" is placed in the appropriate document position indicated by the dashed line according to the dimensions of the document 1, that is, in the reference area E with the length and width according to the length and width dimensions of the document 1.
This is to explain the reading scan when the document 1 is set in a distorted state with respect to ' and E, and the document 1 is read by being sequentially scanned in the horizontal direction from the top to the bottom. That is, the document 1 is read and scanned by the horizontal scanning line Lo starting from the portion that protrudes above the vertical reference width area E', and then read and scanned in the horizontal direction at predetermined intervals.
The part located in the reference area E' with the vertical width is sequentially horizontally scanned and read as shown by the horizontal scanning lines La to Lc, and finally the part that protrudes below the reference width area E' in the vertical direction is read. Scanning is performed as shown by the horizontal scanning line Le, and reading of one document is completed.

In the method of the present invention, the original 1 is
When reading and scanning horizontally from top to bottom at predetermined intervals, the parts of the document surface that protrude from the reference areas E' and E are replaced with the same data as the background surface, and
The portion of the document surface that exists within ', E is processed as valid document data as is, while the missing portion of the document surface within reference areas E', E is replaced with all-white data that is the same as the background information of the document surface. Ru. In the method of the present invention, in order to process such document data, the upper and lower edges PT, PB of the document surface are extracted from each line of document data read sequentially by horizontally scanning the document surface. and left and right edges PL, P
R, the upper and lower edges ET and EB of the reference areas E' and E, and the left and right edges EL and ER are extracted, and these document surface edges PT, PB, PL, PR and the upper and lower ends of the reference area ET
, EB and the left and right edges EL and ER are detected, it is determined whether the document surface is within the reference areas E and E' or whether it protrudes from the reference areas E and E'. Data processing is being performed. Here, if the background surface is black, the edge of the document surface is
When entering from a background surface with no original surface to the original surface, the image data changes from black to white, and when entering from the original surface to a background surface with no original surface, the image data changes from white to black. Therefore, it can be detected by distinguishing these differences.

In the method of the present invention, as a result of processing the image data for each horizontal scanning line, the recording paper P has black streaks due to the edge of the document surface and the background surface B as shown in FIG. A removed print image is obtained. 3a), b), and c) show the horizontal scanning lines La, Lb, and the horizontal scanning lines La, Lb of the original surface shown in FIG. FIG. 7 is an explanatory diagram showing a processing procedure for document data in Lc. Horizontal scanning line La
~Lc is within the vertical reference area E', so only the positional relationship between the document surface edge and the horizontal reference area E is determined, and especially in the horizontal scanning line La, the left edge PL of the document surface and the reference The part sandwiched between the left edge EL of area E is regarded as a part A that protrudes from the reference area E of the document surface, and is replaced with the same black color as the background surface, and the right edge PR of the document surface and the right edge ER of the reference area E are replaced with the same black color as the background surface. The sandwiched portion is regarded as a missing portion A of the document surface and replaced with all-white data that is the same as the background information of the document surface, and the document surface within the reference area E is processed as is as valid document data. In addition, in the horizontal scanning lines Lb and Lc, the part sandwiched between the left edge EL of the reference area E and the left edge PL of the document surface is regarded as the missing part A of the document surface, and is filled with all-white data that is the same as the background information of the document surface. is replaced with
The part sandwiched between the right edge ER of the reference area E and the right edge PR of the document surface is regarded as a part A that protrudes from the reference area E of the document surface, and is replaced with the same black as the background surface, and the reference area E
The original surface within is stored as valid original data in the buffer of the print output section, and then one line of printing is performed.

[0009]

According to the method of the present invention, as explained above, even if a distorted original is set in the image reading section and sent or copied, black spots due to the edges of the original surface can be avoided. You can obtain an easy-to-read and beautiful printed image with streaks and background surfaces removed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a method for reading and scanning a document according to the method of the present invention.

FIG. 2 is a diagram illustrating the principle of image processing in the method of the present invention when the background surface is black.

FIG. 3 is an example diagram of a printed image corrected by the method of the present invention.

FIG. 4 is an example of a print image obtained by a conventional method when a document is set in a distorted manner.

[Explanation of symbols]

1... Manuscript E, E’・・・Reference area for document width

Claims (1)

[Claims] Claim 1: A method for correcting the read original image by processing the original data read by horizontally scanning the original surface line by line. The missing parts of the document surface located within the standard area of the document are replaced with completely white data, the parts of the document surface located within the standard area of the document width are read as is, and the parts of the document surface that protrude from the standard area of the document width are replaced with the background. A method of correcting an original image for a distorted original, characterized by performing a process of replacing the image with the same data as the side.