JP2004266655A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of further applying correction after elimination in the image forming apparatus equipped with a gummed-side printing eliminating function. <P>SOLUTION: The image forming device is equipped with a gummed-side printing eliminating part 3 for obtaining a gummed-side printing eliminated image data resulting from applying read gummed-side printing elimination processing to one side of an original with respect to the double-side printed original, a display editor 11 having an operation display part 5 for displaying an image after gummed-side printing elimination processing and a console panel 6 for inputting setting of correction processing to a gummed-side printing eliminated image displayed on the operation display part 5, and a correction part 7 for applying correction processing to the gummed-side printing eliminated image data in accordance with contents of correction processing inputted from the console panel 6. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image forming apparatus, and more particularly, to an image forming apparatus having a show-through removal function.
[0002]
[Prior art]
In image input of a document printed on both sides of paper, there is a problem in that so-called show-through occurs when an image of a single-sided document is input. For example, U.S. Pat. No. 5,932,137 discloses an image forming apparatus that removes show-through components at the time of inputting an image by scanning images on both front and back screens, making a comparison determination, and removing show-through components. ing. However, the method of scanning the screen image that causes show-through in this way and comparing the images requires a special input mechanism for accurately setting and reading the two-sided original accurately. There was a problem. In addition, there is a problem that a memory for storing image data of an extra screen is required, and additional software and hardware are required to compare the data stored in the extra memory.
[0003]
Japanese Patent Laying-Open No. 2001-169080 discloses a color image processing method that eliminates show-through from a color image using only one-sided image information of a paper without depending on a special input device. A method and a processing device thereof are disclosed. In the invention of the publication, the user can set the threshold value according to the degree of show-through and the paper quality.
[0004]
Japanese Patent Application Laid-Open No. 2001-313832 discloses an area in which a histogram is created from input image data, the most frequent luminance value in the histogram is determined, and a luminance value that is a candidate for a background is located near the mode. A method of automatically detecting and removing show-through by determining a background candidate luminance region is disclosed.
[0005]
[Patent Document 1]
U.S. Pat. No. 5,932,137
[Patent Document 2]
JP 2001-169080 A (pages 2, 7 to 9, FIGS. 1 to 5)
[Patent Document 3]
JP 2001-313832 A (pages 2, 5 to 8, FIGS. 1 to 6)
[0006]
[Problems to be solved by the invention]
However, according to the above-described methods, any of the above-described methods has an advantage of having a degree of freedom in which a user can select various thresholds for determining show-through. There is a problem that it is not clear whether the image is an image from which only show-through has been removed or whether an image originally drawn on a document together with show-through has been removed due to misrecognition of the apparatus.
[0007]
The present invention has been made in view of the above-described problems, and an object of the present invention is to improve the precision of show-through removal by performing correction processing even when the original image is mistakenly removed in show-through removal. It is an object of the present invention to provide an image forming apparatus capable of obtaining a document image more desired by a user.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 comprises a show-through removal means for performing show-through removal processing on image data obtained by reading one side of the original from a double-sided printed original; Display setting means for displaying the image data subjected to show-through removal processing by the removal means, and inputting the setting of the correction processing to the displayed image data; and the correction processing set by the display setting means, An image forming apparatus comprising: a show-through correction unit that applies to image data.
[0009]
According to the first aspect of the present invention, a show-through removal unit that performs a show-through removal process on image data obtained by reading one side of a document from a double-sided printed document, and the show-through removal process is performed by the show-through removal unit. Display setting means for displaying the image data and inputting the setting of the correction processing to the displayed image data, and show-through correction means for applying the correction processing set by the display setting means to the image data; With this arrangement, the operator can visually recognize the image from which show-through has been removed on the display setting unit, and can perform correction processing if necessary, thereby preventing erroneous determination at the time of show-through removal. An image forming apparatus having a show-through removal function that can obtain a desired image can be provided.
[0010]
According to a second aspect of the present invention, in the image forming apparatus according to the first aspect, the show-through correction unit performs show-through correction on the show-through removal image displayed on the display setting unit. Further, there is further provided an area designating means for adding and / or deleting.
[0011]
According to the second aspect of the present invention, there is further provided an area designating means for adding and / or deleting an area where the show-through correction means performs show-through correction with respect to the show-through removal image displayed on the display setting means. Accordingly, it is possible to partially correct erroneous determination at the time of show-through removal, so that it is possible to provide an image forming apparatus having a show-through removal function capable of obtaining a more desired image.
[0012]
According to a third aspect of the present invention, in the image forming apparatus according to the first or second aspect, the show-through correction process performed by the show-through correction unit on the image data displayed on the display setting unit is performed. The image processing apparatus further includes a correction level designating unit for designating a level, wherein the show-through correction unit performs a correction process according to the level designated by the correction level designating unit.
[0013]
According to the third aspect of the present invention, there is further provided a correction level designating means for designating a level of a show-through correction process performed by the show-through correction means on the image data displayed on the display setting means. By performing the correction processing according to the level specified by the correction level specifying means, it is possible to perform more precise correction on the erroneously determined image at the time of show-through removal on the show-through removal image. It is possible to provide an image forming apparatus having a show-through removal function capable of preventing erroneous determination at the time of removal of an image and obtaining a more desired image.
[0014]
According to a fourth aspect of the present invention, in the image forming apparatus according to any one of the first to third aspects, the image before the show-through removal unit performs the show-through removal processing on the image data. A show-through removal canceling unit for returning to data is further provided.
[0015]
According to the fourth aspect of the present invention, the show-through removing means further includes a show-through removal canceling means for returning the image data to the image data before performing the show-through removal processing on the image data. Even if the original image is accidentally removed as show-through, it is possible to return to a state where the original image has not been removed, so that erroneous determination at the time of show-through removal can be prevented and a more desired image can be obtained. An image forming apparatus having a reflection removal function can be provided.
[0016]
According to a fifth aspect of the present invention, in the image forming apparatus according to any one of the first to fourth aspects, the correction canceling means for returning to the image data before the show-through correcting means performs the correction processing, It is further characterized by being provided.
[0017]
According to the fifth aspect of the present invention, when the show-through correction means further includes a correction canceling means for returning to image data before performing the correction processing, the image quality is deteriorated by the correction processing by the show-through correction means. Since it is possible to return to an image before the correction processing is performed, it is possible to provide an image forming apparatus having a show-through removal function capable of obtaining a more desired image.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of an image forming apparatus according to the present invention will be described with reference to the accompanying drawings. Overall Configuration of Image Forming Apparatus] [2. Show-through removal unit] [3. Correction Unit and Correction Processing Operation].
[0019]
[1. Overall Configuration of Image Forming Apparatus]
FIG. 1 is a functional configuration diagram of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a hardware configuration diagram of the image forming apparatus according to the embodiment of the present invention. The image forming apparatus includes a scanner 1 for reading a document image, a conversion unit 2 for performing A / D conversion of an image read by the scanner 1 and performing correction such as γ correction, and detecting show-through in the converted image data to show-through. The show-through removal unit 3 that performs the removal process, the operation display unit 5 that displays the image that has undergone the show-through removal process, the show-through removal reprocessing and the correction process for the image displayed on the operation display unit 5, and the like. An operation panel 6 for inputting settings such as a region to be processed, a correction unit 7 for performing processing such as correction on image data in accordance with settings made from the input from the operation panel 6, and an image data processed by the correction unit 7 An image processing unit 8 that performs image processing for output and a printer 9 that outputs an image subjected to image processing are provided. Here, the operation display unit 5 and the operation panel 6 are configured as a display editor 11 which is one device.
[0020]
Here, the show-through removal unit 3 constitutes a show-through removal unit in the present invention. Similarly, the correction unit 7 constitutes show-through correction means. The display editor 11 having the operation display unit 5 and the operation panel 6 constitutes a display setting unit.
[0021]
The image forming apparatus according to the embodiment employs a configuration using a computer device that digitally processes an image input from the scanner 1. That is, the image forming apparatus includes a central processing unit (CPU) 21, a ROM (Read Only Memory) 22, a RAM (Random Access Memory) 23, a hard disk 10, an operation display unit 5, an intervening interface (not shown), and a bus 23. Including. The functions of the respective processing units are executed by the CPU 21 reading a program stored in the hard disk 8 or the ROM 22.
[0022]
FIG. 3 is a flowchart illustrating an outline of an operation flow of the show-through removal process performed on the input image by the image forming apparatus according to the embodiment. An original image is input by the scanner 1 (step S301), and the read image is A / D converted by the conversion unit 2 and subjected to correction such as γ correction. The show-through removal unit 3 performs show-through removal processing by detecting show-through and replacing the detected show-through part with the background color of the document (step S302). The image data that has undergone show-through removal processing is transmitted to the operation display unit 5, and the operation display unit 5 displays the image that has undergone show-through removal processing (step S303).
[0023]
Here, the user visually recognizes on the operation display unit 5 the image that has been read and subjected to the show-through removal processing. Then, whether the actual show-through has been removed normally, the show-through still remains, the necessary image other than the show-through has been removed, or the show-through processing with stronger strength is required. Judge whether there is. Then, the user operates the operation panel 6 based on the user's judgment and inputs necessary processing. The input setting content is output to the correction unit 7 (Step S304).
[0024]
The correction unit 7 sets various setting contents based on the input from the operation panel 6 and performs the set processing on the displayed image. Examples of the processing to be performed on an image include, for example, a show-through removal cancel processing for canceling the applied show-through removal processing, a show-through removal processing for further removing a show-through part that has not been sufficiently removed, and an erroneous recognition as a show-through. The processing includes reproducing the image of the portion that has been removed by the show-through removal unit 3 or executing the show-through processing by changing the level of the show-through removal processing (step S305).
[0025]
[2. Show-through removal section]
Here, as a method of the show-through removal processing by the show-through removal unit, a known method of removing show-through components, for example, Japanese Patent Application Laid-Open No. 2001-169080 (“Color Image Processing Method, Color Image Processing Apparatus, Recording medium ”). The show-through removal processing will be described below.
[0026]
FIG. 4 is a flowchart illustrating a show-through removal operation performed by the show-through removal processing unit of the image forming apparatus according to the embodiment. Before the show-through removal unit 3 performs the show-through removal processing, pre-processing such as A / D conversion and density correction by the conversion unit 2 is performed as usual, and thereafter, halftone processing and the like are performed.
[0027]
When a color image is input by the scanner 1 (step S401), first, the image is reduced (step S402). By processing an image created by reducing the original image, processing can be speeded up, the amount of working memory can be saved, and implementation can be simplified. Next, the color coordinate system is converted (step S403). In the RGB space, since the independence between components is low, it is difficult to increase the accuracy of edge detection, and it is easily affected by noise. Therefore, the coordinate system is converted to an appropriate one to improve the accuracy of edge detection, and Try to eliminate the effects of
[0028]
Subsequently, edge strength calculation is performed (step S404). By using the edge strength detection, as a result, a foreground portion of a color document such as a text or a line drawing or a background portion having a higher luminance (lighter color) than a show-through portion can be retained. Next, an edge is detected by performing a binarization process (step S405), and a color threshold process is performed on an area other than the edge (step S406). The show-through portion can be corrected without inputting / accumulating the back side image. By the color threshold processing, the surface and the show-through portion can be distinguished, and the color can be specifically estimated. The size of the show-through part to be removed can be explicitly specified by the size of the window to be set. Since the processing is based on local operations, the amount of working memory can be saved and the implementation can be simplified. Next, a show-through removal image is synthesized based on the background color image estimated by the color threshold processing (step S407).
[0029]
Subsequently, the edge strength of the show-through removed image is calculated (step S408), and an edge difference image is generated for the original image and the show-through removed image (step S409). By comparing an image generated as a processing result with the original image, a portion where the image has deteriorated due to inappropriate processing can be detected by a simple operation. By re-executing the process around the location, it is possible to prevent the image from deteriorating and improve the processing result. Next, the edge intensity difference is binarized (step S410), the processing scale (window size) is reduced, and a color threshold process is performed in the same manner as in step S406 to estimate a background color image (step S411). The reflected image is synthesized (step S412). For modified color thresholding using a small window size, the size of the show-through part to be removed depends on the local properties (such as complexity) of the image on the surface, but for complex parts it depends on the size of the window. By reducing the size of the show-through portion to be removed, it is possible to prevent deterioration of the image on the surface.
[0030]
Subsequently, the show-through portion is estimated (determined) by calculating the difference between the show-through removed image and the reduced original image (step S413). Finally, the show-through portion in the original image of the original resolution is removed (step S414). The show-through removal processing unit 3 executes each of the above-described processes by executing a program. The image from which the show-through portion has been removed in this way is displayed on the operation display unit.
[0031]
Next, some of the show-through removal processing methods will be described.
[0032]
(1) Use of color edge strength:
Since the show-through portion is input after being transmitted through the paper, the low-pass filter acts. Since the characteristics of the low-pass filter depend on the physical properties of the paper, it is difficult to specify quantitatively, but qualitatively assumes that the edge strength of the show-through part is weaker than that of the table image That is natural. In addition, in order to calculate the edge strength with high precision, the edge strength calculated by each component of RGB is not simply added, but the edge method by the vector method using a combination of three components together with an appropriate color coordinate system conversion. Detection "A. Cumani,""Edge detection in multispectral images," Graphical Models and Image Processing, vol. 53, no. 1, pp. 40-51, e. Cok, "Detecting boundaries in a vector field," IEEE Trans. Signal Processing, vol. 39, no. 5, pp. 1181-1194, 1991. " It is desirable to utilize. Further, by performing an appropriate threshold processing on the edge strength, it is possible to remove the edge of the show-through portion. The level of show-through removal can be changed by selecting the threshold value.
[0033]
In selecting the threshold value, the distribution of the edge strength is statistically analyzed and automatically set, or several threshold values are prepared in advance and set by the user according to the degree of show-through and paper quality. I do. Alternatively, a method may be used in which a plurality of show-through removal images as a result of processing by some preset threshold values are made to coexist on the screen, and a desired show-through removal image is selected from a plurality of types of images. . Alternatively, the threshold value may be set automatically by the paper thickness.
[0034]
(2) Background color estimation by region-selective local color threshold processing:
Among the show-through parts, consider removing high-frequency components such as characters and lines. Now, it is assumed that a window is set in the image such that no edge exists therein. In this window, (a) whether or not there is show-through, (b) a region where the surface image is composed of a single color, (c) a region where the color of the surface image is gradually changing, (d) 3) Since the important edges of the surface image have been removed by threshold processing, they can be classified based on the viewpoint of whether the region is composed of a plurality of different colors.
[0035]
When viewed locally, the show-through portion usually has lower brightness than the front image. Therefore, the inside of the window is classified into two colors, and the inside of the window is replaced with a color having a higher luminance (brighter). In addition, color clustering typically requires iterative calculations, but here a fast color thresholding algorithm "SC Pei and CM Cheng, based on the quaternion representation of the image and the principle of moment preservation. "The process of Color Image processing by using binary quaternion-moment-preserving thresholding technology," is based on IEEE Trans. . In addition, the maximum size S of the window is specified to determine the “scale” of the process. This operation removes show-through when the area in the window has the property (b) described above. However, when this operation is performed on an area having the above-described properties (c) and (d), if S is too large, image deterioration and distortion occur.
[0036]
(3) Image synthesis:
The show-through-removed image is synthesized by using the original image around the edge and using the background color estimated in (2) above for other portions.
[0037]
(4) Correction of show-through removal image by multi-scale edge difference analysis:
As is apparent from the operation (1), the edges included in the show-through removal image should be a subset of the edges of the original image. Looking at each pixel, the edge intensity in the show-through removal image cannot be stronger than that in the original image. If an edge that is not present in the original image is present in the show-through-removed image, this is a side effect caused by the processing scale (the maximum size S of the window) being too large in the operation (2). To correct this, the show-through removed image is corrected by redoing the background color estimation around the false edge at a smaller scale. It is desirable to adaptively determine an appropriate processing scale for each image, but this is actually difficult. Therefore, the scale is adaptively determined while comparing the processing result with the original image based on the edge information by the coarse-to-fine strategy.
[0038]
In addition, the algorithm relating to the color image processing method may be omitted because a known technique may be used (for example, the invention of Japanese Patent Application Laid-Open No. 2001-169080). Then, background color estimation is performed by local color threshold processing.
[0039]
Generally, the edge of the show-through part (off-set area) is weaker than the edge of the image of the table, and as a result of performing the threshold processing on the edge, the show-off part is included in the “region without edge”. Since the show-through part has a lower density (darker color) than the background color of the table, perform “two-color processing (calculate two representative colors in the area)” on the specified area, Is performed to replace the area with the color of. Thereby, the show-through portion in the designated area is removed.
[0040]
When the show-through removed image is generated, the color coordinate system is inversely transformed and returned to RGB. Finally, in the original image of the original resolution, a process of replacing pixels determined as show-through portions with colors in the show-through removed image is performed.
[0041]
[3. Correction Unit and Correction Processing Operation]
Next, a case will be described in which after the show-through-removed image is displayed on the operation display unit, the correction processing is further performed while the user views the displayed image. At that time, it may be sufficient to perform a correction process on a partial area in addition to the show-through check on the entire area of the image.
[0042]
FIG. 5 is a diagram illustrating an operation in which the correction unit of the image forming apparatus according to the embodiment performs a correction process on a displayed image. FIG. 6 is a flowchart illustrating an operation in which the correction unit of the image forming apparatus according to the embodiment performs a correction process on a displayed image. The processing operation of the correction unit of the image forming apparatus according to the embodiment will be described with reference to FIGS. The scanner 1 performs pre-scanning, inputs image data, and converts the image data by the conversion unit 2 (step S601). The converted image data is subjected to show-through removal processing by the show-through removal unit 3 (step S602). ). Then, after the resolution processing is performed by the resolution processing unit 25, the show-through removed image is displayed on the operation display unit 5 (step S603). At the same time, image data that is separately read from the show-through removal processing unit 3 and not show-through removed is stored in the image memory 31 by the image memory writing unit 30 (step S604). The image memory 31 uses the RAM 9.
[0043]
When an area to be corrected is specified on the operation display unit 5 of the display editor 11, the specification is output to the area identification code writing unit 33 and written to the area memory 32. The area identification code is an address corresponding to each pixel in the designated area. Here, the area memory 32 for reading the area identification code uses the RAM 9 and is provided in advance for the image size. That is, when an area for performing show-through correction is specified and input on the image displayed on the operation display unit 5 via the operation panel 6 (step S605), the area identification code writing unit 33 writes the area identification code to the area memory 32. Then, the area identification code corresponding to the designated area is written (step S606). By writing the area identification code into the area memory 32, the area where the correction section 7 performs show-through correction is specified, that is, added. The operation display unit 5, the operation panel 6, the area identification code writing unit 33, and the area memory 32 constitute an area designating unit in the present invention.
[0044]
For the area specified on the display editor 5, the correction processing content for the show-through removal image is input from the operation panel 6. The input setting content of the show-through correction processing is output to the show-through correction unit 7 (step S607).
[0045]
Next, the operation of the show-through correction unit 7 will be described. When the content of the correction process is input from the operation panel 6 and output to the show-through correction unit 7, the image data subjected to the show-through removal process is output from the image memory 31 to the correction unit 7 (step S608). At this time, the area identification code writing unit 33 reads the area identification code corresponding to the area specified on the operation display unit 5, that is, the address corresponding to the pixel of the specified area, from the area memory 32 (step S609). Then, the correction unit 7 reads the table 34 in which the processing corresponding to the area identification code is defined (step S610), and performs the processing defined by the table on the read area identification code (step S611). . The table 34 is stored in the hard disk 10 in advance. Alternatively, it is also possible to create by writing or correcting the processing content by input from the operation panel 6.
[0046]
Table 34 (FIG. 5) schematically shows an example of a table used by the image forming apparatus according to the embodiment. The area identification code is written on the left side of the table 34, and the corresponding processing content is written on the right side. In the table 34, the processing contents A, B, C,... Correspond to the identification codes 0, 1, 2,.
[0047]
Here, for example, the process A is a process of directly using the read pixel data, the process B is a process of replacing a pixel corresponding to the identification code with a background color, and the process C is an error diffusion process of a pixel corresponding to the identification code. Is performed. According to this table, for example, when the process A is performed, a process of outputting the read image data without performing the show-through process for the pixel corresponding to the area identification code (that is, the address) is performed. When the process B is performed, the pixel corresponding to the area identification code (that is, the address) is replaced with the background color, and the replacement process is performed based on the background color. Therefore, the show-through removal process is performed. When the processing of C is performed, the error diffusion processing is performed. The contents determined by the table 34 determine the correction in the designated area. Then, by selecting and using various tables, various correction processes can be selected and performed.
[0048]
If the contents determined by the table 34 are, for example, contents for determining a correction level in an area designated by selecting a pixel, the correction level for show-through processing can be changed. For example, when the B processing is increased for the pixel corresponding to the identification code, the number of pixels to be replaced with the background color increases, and as a result, show-through removal is enhanced. In addition, when the above-described A processing is increased for the pixel corresponding to the identification code, the pixel which is not replaced with the background color and is read is adopted, so that the number of pixels which are not subjected to show-through removal increases, and as a result, The setting to reduce the show-through removal level.
[0049]
Here, the operation display unit 5, the operation panel 6, the area identification code writing unit 33, the area memory 32, the table 34, and the correction unit 7 constitute a correction level designation unit of the present invention.
[0050]
Further, when the processing corresponding to the area identification code is all the processing of the above A, the table 34 is read to cancel the show-through removal processing in the area specified by the input on the operation panel 6. This is a process of returning to the original image data.
[0051]
Here, the operation display unit 5, the operation panel 6, the area identification code writing unit 33, the area memory 32, the table 34, and the correction unit 7 constitute a show-through removal canceling unit of the present invention.
[0052]
Here, when the image memory 31 is not provided, the image may be read again when outputting the image data, and may be compared with the area identification code and processed. As a result, even when there is no image memory, the same output result can be obtained as in the case where the image memory is provided and the correction processing is performed in area units using the image memory.
[0053]
When an image is first read by pre-scanning, show-through correction is performed on the entire surface of the image in the area memory 32 and the table 34. In this case, the same area identification code is written in the area memory 32 as an initial value, and the table 34 is set to perform show-through correction on the entire area identification code.
[0054]
When an image is first read by pre-scanning, image data without performing show-through removal is stored in the area memory 32. This is because it can also be used when canceling show-through removal over the entire surface. If necessary, the data in the area memory 32 and / or the image memory 31 may be stored on the hard disk 10.
[0055]
The show-through correction or the correction processing is performed, and the result is displayed on the display editor 5. If the user wants to cancel the processed image, the table before the processing used in the immediately preceding processing is used. If the processing is performed on the image data, the processing can be canceled. Here, the operation display unit 5, the operation panel 6, the area identification code writing unit 33, the area memory 32, the table 34, and the correction unit 7 constitute a correction canceling unit of the present invention.
[0056]
When the user partially cancels the show-through removal processing, the user specifies an area in which the show-through removal processing is canceled. When the area for canceling the show-through removal processing is specified, the area specified in the area memory 32 is set so that the area identification code is different from the area identification code of the entire area. Then, for the area identification code of the area for which cancellation is specified, the setting table for not performing show-through correction, that is, all processing contents corresponding to the area identification code in the specified area are set as the processing A. By doing so, it is possible to partially cancel the show-through removal processing.
[0057]
According to the present invention, by allowing the user to specify the correction area of the show-through part in this way, the erroneous determination of the show-through part can be visually recognized and the correction processing can be performed again. Misjudgment of removal can be reduced, and a more desired image can be obtained.
[0058]
Also, when the user specifies the area specification and the level specification for the area from the display editor, the area identification code of the area and the level at which the correction for the area is corrected are stored in the table as the processing contents, so that the data can be stored. At the time of output, show-through correction can be performed according to the show-through correction level of the table, so that correction processing can be performed at a specified level in a specified area, and a more desired image can be obtained for a user. You.
[0059]
【The invention's effect】
According to the first aspect of the present invention, the operator can visually recognize the show-through removal image on the display setting unit, and can perform correction processing if necessary, so that an erroneous determination at the time of show-through removal can be made. There is an effect that it is possible to provide an image forming apparatus having a show-through removal function by which a user can obtain a desired image by correcting.
[0060]
Further, according to the second aspect of the present invention, since the displayed image can be partially corrected, the user can correct the erroneously determined portion in the show-through removal. Therefore, it is possible to provide an image forming apparatus having a show-through removal function capable of obtaining a more desired image.
[0061]
Further, according to the third aspect of the invention, since a correction level can be set for the show-through removal image and more precise correction can be performed, the user can make an erroneous determination at the time of show-through removal by using the correction level. Is set, the effect is obtained that an image forming apparatus having a show-through removal function capable of obtaining a more desired image can be provided.
[0062]
According to the fourth aspect of the present invention, even if the original image is erroneously removed as show-through by the show-through removal means, the original image can be returned to a state where it has not been removed. Can be canceled by the user, and an image forming apparatus having a show-through removal function capable of obtaining a more desired image can be provided.
[0063]
Further, according to the invention, when the image quality is deteriorated by the correction processing by the show-through correction means, the user can return to the processed image before the correction processing. This makes it possible to provide an image forming apparatus having a show-through removal function that can more accurately correct the result of the erroneous determination and obtain a more desired image.
[Brief description of the drawings]
FIG. 1 is a functional configuration diagram of an image forming apparatus according to an embodiment of the present invention.
FIG. 2 is a hardware configuration diagram of the image forming apparatus according to the embodiment of the present invention.
FIG. 3 is a flowchart illustrating an outline of an operation flow in which the image forming apparatus according to the embodiment performs processing on image data.
FIG. 4 is a flowchart illustrating a show-through removal processing operation by a show-through removal processing unit of the image forming apparatus according to the embodiment;
FIG. 5 is a diagram illustrating an operation in which a correction unit of the image forming apparatus according to the embodiment performs a correction process on a displayed image.
FIG. 6 is a flowchart illustrating an operation in which a correction unit of the image forming apparatus according to the embodiment performs a correction process on a displayed image.
[Explanation of symbols]
1 Scanner
2 Conversion unit
3 show-through removal unit
5 Operation display
6 Operation panel
7 Correction unit
8 Image processing unit
9 RAM
10 Hard disk
11 Printer
21 CPU
23 Data bus
25 Resolution processing unit
30 Image memory writing unit
31 Image memory
32 area memory
33 Area identification code writing unit
34 table

Claims (5)

Show-through removal means for performing show-through removal processing on image data obtained by reading one side of the original for a double-sided printed original,
Display setting means for displaying image data subjected to show-through removal processing by the show-through removal means, and inputting a setting of a correction process for the displayed image data;
The show-through correction unit that performs the correction process set by the display setting unit on the image data,
An image forming apparatus comprising: An area designating means for adding and / or deleting an area where the show-through correction means performs show-through correction with respect to the show-through removal image displayed on the display setting means. Item 2. The image forming apparatus according to Item 1. Correction level designating means for designating a level of show-through correction processing to be performed by the show-through correction means on the image data displayed on the display setting means, wherein 3. The image forming apparatus according to claim 1, wherein a correction process is performed according to the level specified by a unit. 4. The apparatus according to claim 1, further comprising a show-through removal canceling unit that returns the image data to image data before the show-through removal unit performs the show-through removal processing on the image data. 5. The image forming apparatus according to claim 1. The image forming apparatus according to claim 1, further comprising a correction canceling unit that returns the image data before the show-through correction unit performs the correction process.

Images