JP2004289671A - Image processing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image processing apparatus in which a processing load of correction processing can be reduced. <P>SOLUTION: A control part 1 separates line drawing portion image data and pattern portion image data from image data of a processing target, separates the line drawing portion image data into a line drawing color plane including color information contained in the line drawing portion image data and a selection plane representing a form corresponding to a line drawing portion, detects a correction parameter associated with correction on the basis of the selection plane, and applies predetermined correction processing to at least one of the line drawing color plane, the selection plane and the pattern portion image data on the basis of the detected correction parameter. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image processing apparatus that performs a predetermined process on image data when transmitting the image data via a network such as a public line or a LAN.
[0002]
[Prior art]
In recent years, many office machines have been digitized, and digital data has been mutually communicated with a control device such as a personal computer, and processing using the digital data has been performed. For example, a digitized copying machine (digital copying machine) includes a scanner unit for reading a document, a printer unit for generating a copied document, and further includes a network card for transmitting and receiving digital data to and from a personal computer. (Scan to PC function) and an operation as a printer. Some digital copiers have a built-in modem and function as a facsimile.
[0003]
This digital copying machine transmits and receives digital data to and from another digital copying machine via a network. For example, image data read by one digital copying machine is transmitted to the other digital copying machine for printing. It is also possible to realize a so-called network copy function.
[0004]
Most office equipment represented by such digital copying machines exchange image data with each other or with a personal computer or the like. However, since image data is generally large in size, it is necessary to reduce the network load. The compressed image data is transmitted after being compressed on the transmission side, and the compressed image data is expanded on the reception side. The original image data (in the case of irreversible compression, the image data is close to the original image data, Here, it is referred to as original image data) and processed.
[0005]
In this compression processing, it is known that the compression efficiency can be further improved by performing compression processing using different compression methods on a line image portion such as a character portion and a photographic image portion.
[0006]
That is, with respect to the image data to be processed, so-called T / I separation for separating the image data into a line drawing portion and a photograph portion is performed, and the line drawing partial image data (character image plane) and the photograph partial image data (picture pattern) And image planes). Then, the line image partial image data and the photograph partial image data are subjected to compression processing using a compression method with a relatively high compression ratio for each of the partial image data.
[0007]
On the receiving side, each of the partial image data compressed by the different compression methods is received, and for each of the partial image data, decompression processing corresponding to the respective compression method is performed, and the line drawing partial image data and the photograph partial image data are converted. Then, these are combined to generate original image data.
[0008]
Further, for the line image partial image data, a line image color plane including the color information of each line image and a selection plane including the shape information of each line image may be generated, and compression may be performed on the respective lines using different compression methods. Good. Specifically, as shown in FIG. 8A, in the image data in which the characters “ABC” are represented in red and the characters “123” are represented in blue, the line drawing color plane of the line drawing partial image data is , A red rectangle including the character area of “ABC” and a blue rectangle including the character area of “123” (FIG. 8B), and the selection data includes the shape of the character “ABC”. And the shape of the character "123" are included as a black and white binary image (FIG. 8C). If pixels corresponding to black pixels in the partial image data of FIG. 8C are selectively extracted from the partial image data of FIG. 8B, the partial image data of FIG. (Line drawing partial image data) is to be reproduced.
[0009]
Here, the figure included in the line drawing color plane is only a rectangle, but may be another primitive (a basic figure such as a circle or another polygon).
[0010]
As described above, in the method in which the line drawing color plane, the selection plane, and the photograph partial image data (picture image plane) are separated and compressed, the resolution conversion processing and the compression processing suitable for the partial image included in each plane are performed. Since each of the above image processings can be applied, the compression ratio can be improved while suppressing the deterioration of the image quality.
[0011]
On the other hand, a document read by a scanner or the like is accompanied by image deterioration unique to optical reading. For example, the image data as a whole may be included due to noise as a so-called artifact (such as a group of dots isolated from a surrounding image, hereinafter referred to as an “isolated point”), or the original may be inclined with respect to the scanning direction of the scanner. In some cases, such as tilting, processing for noise removal or tilt correction is required. Further, there is a case where a process (erecting process) such as rotation by 90 degrees or the like is desired in view of the relationship between the portrait and landscape orientation of the document.
[0012]
2. Description of the Related Art Conventionally, various types of image data including color image data are subjected to processes such as noise removal, for example, based on G (green) pixel value data among RGB-expressed full-color image data. There is a method in which a point is detected, and when an isolated point is detected, each pixel value of RGB for the isolated point is replaced with a predetermined density level (Patent Document 1).
[0013]
[Patent Document 1]
JP 2002-325180 A
[0014]
[Problems to be solved by the invention]
However, the above-described conventional image processing method has a problem that a processing load is generally large when correction processing such as noise removal processing is performed on color image data.
[0015]
The present invention has been made in view of the above circumstances, and has as its object to provide an image processing apparatus capable of reducing the processing load of correction processing such as noise removal for image data to be subjected to compression processing.
[0016]
[Means for Solving the Problems]
The present invention for solving the problems of the above conventional example is an image processing apparatus, comprising: means for separating character and line image data and picture image data from image data to be processed; Means for separating image data into character line drawing color image data including color information included in the character line drawing image data, and selected image data representing a shape corresponding to the character line drawing portion, based on the selected image data, Means for detecting a correction parameter related to the correction, based on the detected correction parameter, means for performing a predetermined correction process for at least one of the character line image color image data, the selected image data, and the picture image data, Means for individually compressing the character line image color image data, the selected image data, and the pattern image data after the correction process. That.
[0017]
As described above, according to the present invention, the processing load of the correction processing such as noise removal can be reduced by performing the correction processing based on the selected plane.
[0018]
The present invention for solving the problems of the above-mentioned conventional example is an image processing apparatus, which separates character and line image data and pattern image data from image data to be processed, From the data received from the device that performs compression processing by separating the character line drawing color image data including the color information included in the character line drawing image data and the selected image data representing the shape corresponding to the character line drawing portion, Means for acquiring individual compression processing results of the character line image color image data, selected image data, and picture image data; means for detecting a correction parameter related to correction based on the obtained selected image data; A predetermined correction process is performed on at least one of the character line image color image data, the selected image data, and the pattern image data based on the corrected correction parameters. Characterized in that it comprises a stage, a.
[0019]
Here, a pixel value changing means for changing the pixel value of at least a part of the pixel value on the picture image data corresponding to the pixel set as corresponding to the character / line image portion on the selected image data May be further included. In addition, the predetermined correction process is a process of removing a noise pixel that is an isolated point from the selected image data, and the pixel value changing unit is configured to remove the picture image data corresponding to the removed pixel. The upper pixel value may be changed.
[0020]
Further, the pixel value changing means may change the pixel value to be changed based on the pixel value of a pixel adjacent to the pixel to be changed.
[0021]
The present invention for solving the problems of the conventional example described above separates character / line image data and pattern image data from image data to be processed, and converts the character / line image data into the character / line image data. Is separated into character / line image color image data including the color information included in the image data and selected image data representing a shape corresponding to the character / line image portion, and the character / line image color image data, the selected image data, and the pattern image data are individually separated. An image processing method using an image processing device for performing a compression process or an expansion process, wherein a predetermined correction is performed on at least one of the character line image color image data, the selected image data, and the pattern image data based on the selected image data. Processing is performed.
[0022]
Further, an image processing program according to another aspect of the present invention separates character / line image data and pattern image data from image data to be processed, and converts the character / line image data into the character / line image data. Is separated into character / line image color image data including the color information included in the image data and selected image data representing a shape corresponding to the character / line image portion, and the character / line image color image data, the selected image data, and the pattern image data are individually separated. An image processing apparatus for performing a compression process or a decompression process performs a predetermined correction process on at least one of the character / line image color image data, the selected image data, and the picture image data based on the selected image data. .
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the image processing apparatus according to the embodiment of the present invention includes a control unit 1, a storage unit 2, and an interface unit 3, and is realized by a general computer. .
[0024]
The control unit 1 operates according to a program stored in the storage unit 2 and performs preliminary correction processing, plane separation processing, correction processing, compression processing, and wrapping processing on image data input via the interface unit 3. , And outputs the image data after each of the above processes via the interface unit 3. The specific processing contents of the control section 1 will be described later in detail.
[0025]
The storage unit 2 includes a computer-readable storage medium such as a hard disk device storing a program executed by the control unit 1 and the like, and a driver that reads a program and the like from the storage medium and outputs the program and the like to the control unit 1. Further, the storage unit 2 includes a storage element such as a RAM (Random Access Memory) and operates as a work memory that holds various data generated in the process of the control unit 1.
[0026]
The interface unit 3 outputs image data input from the outside to the control unit 1. The interface unit 3 outputs image data to an external device according to an instruction input from the control unit 1.
[0027]
Specifically, the image processing apparatus according to the present embodiment is built in a digital copying machine, performs predetermined image processing on image data input from a control device inside the digital copying machine, and performs image processing on the control device side. Output the subsequent image data. In the following description, an example in which a process of removing noise at an isolated point is performed as a correction process will be described.
[0028]
Here, the specific contents of the processing of the control unit 1 will be described. FIG. 2 is a functional block diagram illustrating a processing example in the control unit 1. As shown in FIG. 2, the processing performed by the control unit 1 includes an image input unit 10, a preliminary correction unit 11, a selection plane extraction unit 12, a line drawing color plane generation unit 13, a picture image plane generation unit 14, A line drawing color plane resolution conversion section 15, a picture image plane resolution conversion section 16, a noise removal section 17, a line drawing color plane compression section 18, a picture image plane compression section 19, a selection plane compression section 20, a wrapping process It comprises a unit 21 and an image output unit 22.
[0029]
The image input unit 10 stores image data input from the interface unit 3 in the storage unit 2 as image data to be processed. The pre-correction unit 11 converts the image data to be processed from a color space representation of an external device (for example, an input device such as a scanner) to an internal color space representation (for example, from RGB to L * a * b). Then, predetermined filter processing such as edge enhancement processing is performed.
[0030]
The selection plane extraction unit 12 extracts an image portion (character and line drawing image data) such as a character or a line drawing from the image data after the preliminary correction, binarizes it, and generates the image data of the selected plane. That is, the image data of the selected plane includes image data representing the shape of a portion such as a character or a line drawing. Here, as a method for the selected plane extracting unit 12 to extract a portion such as a line drawing from image data, for example, a method based on edge detection or the like can be used. Here, the noise at the isolated point has a pixel value independent of the surrounding pixels as in the case of a character or the like, and is included in the image data of the selected plane as a line image or the like. In the present embodiment, the selection plane extraction unit 12 extracts an image portion such as a character or a line drawing as a binary black and white image.
[0031]
The line drawing color plane generation unit 13 includes a part such as a line drawing based on the image data subjected to the preliminary correction processing and the image data of the selected plane, and includes a figure painted in the color of the line drawing of the part. The image data of the line drawing color plane (character line drawing color image data) is generated. That is, the line drawing color plane includes color information used in the image data of the line drawing portion.
[0032]
The picture image plane generation unit 14 generates, as the picture image plane image data, image data obtained by removing the portion represented by the selected plane image data from the image data subjected to the preliminary correction processing.
[0033]
The image data of each plane generated by the selected plane extracting unit 12, the line drawing color plane generating unit 13, and the picture image plane generating unit 14 are specifically as shown in FIG. That is, as shown in FIG. 8A, an image in which a character string of “ABC” is described in red, an image in which a character string of “123” is described in blue, and a photographic image The selected plane extracting unit 12 generates a selected plane (FIG. 8C) from the processing target image data including The image data of the selected plane is image data representing an image having the same size as the image data to be processed, and corresponds to a portion where the image of the character string “ABC” or “123” exists on the image data to be processed. The black and white image of the character string of “ABC” and “123” is included in the position where the character string is displayed.
[0034]
The line drawing color plane generation unit 13 extracts, for example, a portion of the image data to be processed, which has an image on the selected plane, based on the image data to be processed and the image data of the selected plane. Of the pixels, a figure that includes a part having a common color and that is filled with the color is drawn over the image data obtained by extraction. Then, the line drawing color plane generating unit 13 generates the image data of the line drawing color plane as shown in FIG. The image data of the line drawing color plane is also image data representing an image of the same size as the image of the image data to be processed. As the processing of the line drawing color plane generation unit 13, a widely known processing can be used.
[0035]
The picture image plane generating unit 14 generates picture image plane image data as shown in FIG. 8D by removing the image data portion of the selected plane from the image data to be processed. Therefore, the image data of the picture image plane includes the background image and the photographic image.
[0036]
The line drawing color plane resolution conversion unit 15 performs a process of converting the resolution of the image data of the selected plane. Similarly, the picture image plane resolution conversion unit 16 converts the resolution of the image data of the picture image plane. These resolution conversion processes are not always necessary, but are generally employed for the purpose of reducing the resolution in order to reduce the data size.
[0037]
The noise removing unit 17 detects noise included in the image data of the selected plane, and removes the detected noise portion from the image data of the selected plane. The noise removing unit 17 may be any unit as long as it performs a process of removing an isolated point from binary black and white image data. An example of the process will be described below.
[0038]
Each pixel of the image data of the selected plane is sequentially selected in the raster scan direction as a pixel of interest, and a window matrix of 3 × 3 pixels as shown in FIG. As shown in FIG. 3B, when only the target pixel is black and all the other pixels are white pixels, the matrix determines that the target pixel is an isolated point and replaces the target pixel with a white pixel, as shown in FIG. . In this example, the position of the target pixel and the pattern of the pixels in the 3 × 3 window matrix correspond to the correction parameter, and the process of replacing the pixel determined as an isolated point corresponds to the correction process.
[0039]
By this processing, when noise occurs at the lower right of the character "F" as shown in FIG. 4A, this noise is processed as an isolated point and removed. Although a 3 × 3 pixel window matrix is used here to detect a noise portion, the window size is not limited to this. For example, a 5 × 5 window matrix may be used. In this case, an image having a size smaller than 3 × 3 pixels around the target pixel may be determined as a noise image. Further, the user may specify the size of the window matrix for this detection.
[0040]
The line drawing color plane compression section 18 performs a compression process using a predetermined first compression method on the image data output from the line drawing color plane resolution conversion section 15, and outputs the image data after the compression processing. The picture image plane compression section 19 performs a compression process using a predetermined second compression method on the image data output from the picture image plane resolution conversion section 16 and outputs the image data after the compression processing. The selected plane compression unit 20 performs a compression process using a predetermined third compression method on the image data of the selected plane after the noise removal, which is output from the noise removal unit 17, and converts the image data after the compression process. Output.
[0041]
The wrapping processing unit 21 wraps the image data output by the line drawing color plane compression unit 18, the picture image plane compression unit 19, and the selected plane compression unit 20 into a predetermined image format. This wrapping can be performed, for example, by generating one data file including each image data as image data of the TIFF-FX format which is an image format for Internet facsimile. The image output unit 22 outputs the image data wrapped by the wrapping processing unit 21 to an external device via the interface unit 3.
[0042]
When a plurality of image data are to be processed, the wrapping processing unit 21 generates and outputs data including a compression processing result of a line drawing color plane, a picture image plane, and a selection plane for each image data. .
[0043]
As a third compression method for the selected plane, a compression method such as MH (Modified Huffman), MR (Modified Read), or MMR (Modified Modified Read), which is lossless compression for 1-bit images, may be used. In addition, since the first and second compression methods for the line drawing color plane and the picture image plane are color data, multi-valued data processing can be easily realized using a general-purpose image processing chip. JPEG method or the like, which is lossy compression for images, may be applied. However, these are merely examples, and, for example, any of the first and second compression schemes may be any compression scheme applicable to color image data.
[0044]
The image processing apparatus according to the present embodiment is configured as described above, and operates as follows. As shown in FIG. 4A, when the processing target image data input from the interface unit 3 includes a noise portion (N) that is an isolated point, a line drawing color plane, a selection plane, A picture image plane is extracted as shown in FIGS. 4B to 4D. What is characteristic in the present embodiment is that the selected plane is separated so that the noise image is included in the selected plane, and that the image data of the selected plane is black and white binary image data. . The control unit 1 performs a noise removal process on the image data of the selected plane (FIG. 4E). In this noise removal processing, only processing relating to black and white binary image data needs to be performed, so that the processing load is reduced.
[0045]
As described above, in the present embodiment, the separation of the noise image portion included in the color image is performed together with the separation process of the line drawing portion for the compression process, and the black and white binary noise image after the separation is removed. Thus, the efficiency of the entire processing is improved.
[0046]
Incidentally, when synthesizing the image data of each of these planes, a selecting unit for selecting the pixel values on the selected plane in the raster scan order, and if the selected pixel value is “white”, a picture corresponding to the selected pixel A reproducing unit that outputs a pixel value on the image data of the image plane and outputs a pixel value on the image data of the line drawing color plane corresponding to the selected pixel if the selected pixel value is “black”; The original image data is generated using an image generation unit that arranges the pixel values sequentially output by the unit in the scan line order in an image data storage area of the same size as the image data of the selected plane (FIG. f)). Here, since noise has been removed from the image data of the selected plane, the result of synthesizing the image data of each of these planes is such that noise has been removed as shown in FIG.
[0047]
Note that, depending on the processing described so far, as shown in FIG. 4F, a portion after noise removal remains as a blank (default pixel value, for example, a white pixel). Therefore, as shown in FIG. 5A, when the picture image plane generating unit 14 generates the picture data of the picture image plane, it corresponds to a portion having a black pixel value on the picture data of the selected plane. The pixel values of the pixels on the image data of the picture image plane are changed and set to values based on the pixel values adjacent thereto. For example, it may be selectively set to any one of adjacent pixel values, or may be set to an average pixel value of a plurality of adjacent pixel values.
[0048]
Further, in this process, as shown in FIG. 5B, only the pixel value of the pixel on the image data of the picture image plane corresponding to the position of the pixel removed as noise by the noise removing unit 17 is changed. It may be performed. In this case, the noise removing unit 17 outputs information for specifying the position of the pixel removed as noise.
[0049]
As described above, the picture image plane generating unit 14 sets the pixel value of a blank portion of the image data of the picture image plane based on the pixel values of the pixels adjacent to the blank portion. The image data of the picture image plane shown in ()) is as shown on the right side of FIG. 5 (a) or as shown in FIG. 5 (b), and the synthesis result corresponding to FIG. 4 (f) is shown in FIG. It will be as shown.
[0050]
Further, in the example described so far, the case where noise that is an isolated point is removed as the correction processing is described as an example. However, the correction processing in the image processing apparatus according to the present embodiment is not limited to this. For example, a process of correcting the inclination of the image may be performed. Also in this case, the inclination is detected by applying a widely known method such as Hough transform to the image data of the selected plane, and the image data of the line drawing color plane and the image data of the pattern image plane are detected using the inclination detection result. The rotation of each of the image data and the image data of the selected plane is corrected.
[0051]
Specifically, as shown in FIG. 7, the processing of the control unit 1 includes an image input unit 10, a preliminary correction unit 11, a selection plane extraction unit 12, a line drawing color plane generation unit 13, and a picture image plane generation unit. 14, a tilt detection unit 31, a selection plane correction unit 32, a line drawing color plane correction unit 33, a picture image plane correction unit 34, a line drawing color plane resolution conversion unit 15, a picture image plane resolution conversion unit 16, It includes a line drawing color plane compression section 18, a picture image plane compression section 19, a selection plane compression section 20, a wrapping processing section 21, and an image output section 22. The inclination detection unit 31 calculates an inclination angle value θ as a correction parameter based on the image data of the selected plane output from the selected plane extraction unit 12 by using a Hough transform or the like. The selected plane correction unit 32 performs a process of rotating the image data of the selected plane output by the selected plane extraction unit 12 by (−θ) with reference to the inclination angle value θ output by the inclination detection unit 31. To erect the image data of the selected plane. The line drawing color plane correcting section 33 and the picture image plane correcting section 34 also perform the same processing to erect the image data of the line drawing color plane and the image data of the picture image plane. In these rotation processes, the number of pixels in the horizontal and vertical directions of each plane after the rotation process is adjusted as necessary. That is, before and after the rotation processing, adjustment is made so that the number of pixels in each plane in the horizontal and vertical directions is equal.
[0052]
The other units perform the same processing as in the example of performing the noise removal correction described above, and a detailed description thereof will be omitted.
[0053]
In this case as well, the Hough transform process, which needs to be applied after performing processes such as normal edge detection, is performed on the selected plane generated in the process of the compression process, thereby being an intermediate product of the compression process. The processing efficiency of correction is improved by effectively utilizing the image data of the selected plane.
[0054]
Further, as another example of the correction processing, in addition to the noise removal and the inclination correction described above, the same processing is performed in the direction correction (adjustment of the vertical and horizontal arrangement) and the combination of the noise removal and the inclination correction. be able to.
[0055]
Further, the image processing apparatus of the present invention is not limited to the embodiments described above. In the description so far, for example, when image data is transmitted, an example in which correction processing is performed before compression processing has been described. However, on the transmission side, compression processing is performed after dividing into planes as in the conventional case. The image data of each plane may be expanded and extracted on the receiving side, and then the correction processing may be performed.
[Brief description of the drawings]
FIG. 1 is a configuration block diagram of an image processing apparatus according to an embodiment of the present invention.
FIG. 2 is a functional block diagram of the image processing apparatus according to the embodiment of the present invention.
FIG. 3 is an explanatory diagram illustrating an example of an isolated point detection process.
FIG. 4 is an explanatory diagram illustrating an example of a state of noise removal processing.
FIG. 5 is an explanatory diagram illustrating an example of a process of changing a pixel value of a picture image plane performed during a noise removal process.
FIG. 6 is an explanatory diagram illustrating an example of a result of a noise removal process.
FIG. 7 is a functional block diagram illustrating another example of the image processing apparatus according to the embodiment of the present invention.
FIG. 8 is an explanatory diagram illustrating an example of a state in which image data is separated into data of each plane.
[Explanation of symbols]
1 control unit, 2 storage unit, 3 interface unit, 10 image input unit, 11 preliminary correction unit, 12 selection plane extraction unit, 13 line drawing color plane generation unit, 14 picture image plane generation unit, 15 line drawing color plane resolution conversion unit, 16 picture image plane resolution conversion section, 17 noise removal section, 18 line drawing color plane compression section, 19 picture image plane compression section, 20 selection plane compression section, 21 wrapping processing section, 22 image output section, 31 inclination detection section, 32 selection Plane correction unit, 33 line drawing color plane correction unit, 34 picture image plane correction unit.

Claims (7)

Means for separating character and line image data and pattern image data from the image data to be processed;
Means for separating the character / line image data into character / line image color image data including color information included in the character / line image data, and selected image data representing a shape corresponding to the character / line image portion;
Means for detecting a correction parameter for correction based on the selected image data,
Means for performing a predetermined correction process on at least one of the character line image color image data, the selected image data, and the pattern image data based on the detected correction parameter;
After the correction processing, means for individually compressing the character line image color image data, the selected image data, and the pattern image data,
An image processing apparatus comprising: From the image data to be processed, character / line image data and picture image data are separated, and the character / line image data is converted to character / line image color image data including color information included in the character / line image data; From the data received from the device that separates and compresses the selected image data representing the shape corresponding to the line drawing portion,
Means for acquiring individual compression processing results of the character line image color image data, the selected image data, and the pattern image data,
Means for detecting a correction parameter for correction based on the acquired selected image data,
Means for performing a predetermined correction process on at least one of the character line image color image data, the selected image data, and the pattern image data based on the detected correction parameter;
An image processing apparatus comprising: The image processing apparatus according to claim 1, wherein:
On the selected image data, for at least a part of the pixel values on the picture image data corresponding to the pixels set as corresponding to the character and line drawing portions, further including a pixel value changing means for changing the pixel value. An image processing apparatus comprising: The image processing device according to claim 3,
The predetermined correction process is a process of removing noise pixels that are isolated points from the selected image data,
The image processing device, wherein the pixel value changing means changes a pixel value on the picture image data corresponding to the removed pixel. The image processing device according to claim 3, wherein:
The image processing apparatus according to claim 1, wherein the pixel value changing unit changes the pixel value to be changed based on a pixel value of a pixel adjacent to the pixel to be changed. From the image data to be processed, character / line image data and picture image data are separated, and the character / line image data is converted to character / line image color image data including color information included in the character / line image data; Separated into selected image data representing a shape corresponding to a line drawing portion, using an image processing apparatus that separately provides the character line drawing color image data, the selected image data, and the pattern image data to compression processing or decompression processing,
An image processing method, comprising: performing a predetermined correction process on at least one of the character / line drawing color image data, the selected image data, and the picture image data based on the selected image data. From the image data to be processed, character / line image data and picture image data are separated, and the character / line image data is converted to character / line image color image data including color information included in the character / line image data; Separated into selected image data representing a shape corresponding to a line drawing portion, the image processing device for subjecting the character line drawing color image data, the selected image data, and the pattern image data to compression processing or decompression processing individually,
An image processing program for causing a predetermined correction process to be performed on at least one of the character line drawing color image data, the selected image data, and the picture image data based on the selected image data.

Images