JP2006165753A - System and method for image processing, storage medium, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of realizing magnification variation processing to be carried out during facsimile transmission, with picture quality suitable for a purpose at a higher speed and lower cost by judging image characteristics that a user requires from operation section setting contents at the time of transmission. <P>SOLUTION: An image processing system includes: a document type setting means for designating one of document types as choices for switching image processing for document data read by a document read means; a 1st digital image magnification variation processing means; a 2nd digital image magnification variation processing means; and a magnification variation processing method selecting means for judging which of the 1st digital image magnification variation processing means and 2nd digital image magnification variation processing means is applied according facsimile transmission resolution determined according to a negotiation result at the time of facsimile transmission and the document type set by the document type setting means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image processing system suitable for use in a digital copying apparatus, a digital multi-function peripheral, a facsimile machine, and the like, and more particularly to a technique for converting the resolution of a digital image.

Conventionally, when performing scaling processing according to the result of negotiation with a transmission destination during fax transmission, a scaling method in which high-speed processing is the highest priority is often taken due to communication time limitations (Patent Documents) 1). In this case, scaling processing can be realized at high speed by simple thinning processing and logical operation. In some cases, a processing algorithm capable of scaling with higher image quality than these processing methods can be realized at high speed by hardware.
Japanese Patent Registration No. 2973899

  The method of scaling the binary image is roughly divided into a method of simply padding or thinning out pixels, and a method of converting the number of pixels by interpolation after once converting to a multi-valued image. The former has the advantage that the processing is very fast, but generally has low image quality, such as low character visibility and impaired tone reproducibility. Although the latter generally has high image quality, there are cases in which the processing time is long, and even with low resolution, it is not possible to say high image quality for the characteristics of faxes where the reproducibility of black fine lines such as characters is regarded as important.

  On the other hand, hardware that realizes scaling processing is more expensive than software, and may not be profitable with respect to the frequency of use, that is, the importance of functions within the product.

  In the present invention, in view of such a problem, by determining the image characteristics desired by the user from the setting contents of the operation unit at the time of transmission, the scaling process performed at the time of fax transmission can be performed at a higher speed with an image quality suitable for the purpose. The purpose is to provide a method that can be realized at low cost.

  In order to solve the above-described problems, the present invention provides a document reading unit for scanning a document and generating digital image data in an image processing system having a fax transmission function, and a method for switching image processing after reading by a user. Type setting means for specifying one of the document types that are options of the first, first digital image scaling processing means, second digital image scaling processing means, and negotiation result at the time of fax transmission Whether to apply the first digital image scaling processing means or the second digital image scaling processing means is determined according to the fax transmission resolution determined from the above and the document type set by the document type setting means. Therefore, it is characterized by comprising a scaling processing method selection means.

  In the present invention, the first digital image scaling processing means is a binary image scaling method, and a weighting coefficient corresponding to a value of a plurality of pixels around the pixel of interest and a distance between the pixel of interest and each of the plurality of surrounding pixels. A means for generating intermediate data by an operation using, and in order to generate a binary image from the intermediate data, errors generated when the pixel value of interest is determined to be 1 or 0 are sequentially distributed to a plurality of peripheral pixels. And a means for implementing an error diffusion method.

  According to the present invention, the second digital image scaling processing means is a binary image scaling method, and the scaling in the sub-scanning direction is realized by a logical sum between a plurality of lines corresponding to the scaling ratio. The sub-scanning direction scaling means and the main-scanning direction scaling change run-length data indicating the binary data switching location according to the scaling factor, and also indicate the number of continuous black pixels after the change at the time of reduction. It is characterized in that it is provided with a main scanning direction scaling process means for performing a process of changing the data to 0 at a place where data becomes 0.

  According to the present invention, in the scaling processing method selection means, four types of fax transmission resolutions and 3 are specified in order to designate application conditions of the first digital image scaling processing means and the second digital image scaling processing means. It is further characterized by further comprising means for setting from the operation unit using various types of document types as parameters.

  The intermediate data generating means included in the first digital image scaling processing means may further comprise means for setting coefficients from the operation unit to change the weights of the black pixels and white pixels of the original image. It is characterized by.

  As described above, according to the present invention, according to the image processing system having the fax transmission function, the fax transmission resolution determined from the negotiation result at the time of fax transmission and the document type set by the document type setting unit are used. Since a means for determining which one of the digital image scaling processing means and the second digital image scaling processing means is applied is provided, the scaling processing having two different characteristics is switched according to the image characteristics required by the user. It becomes possible.

  Further, the first digital image scaling processing means generates intermediate data by calculation using a value of a plurality of surrounding pixels of the target pixel and a weighting factor according to the distance between the target pixel and each of the plurality of surrounding pixels; In order to generate a binary image from the intermediate data, there is provided means for performing an error diffusion method in which an error generated when the target pixel value is determined to be 1 or 0 is sequentially distributed to a plurality of peripheral pixels. Scaling processing with excellent density preservation and gradation reproducibility is possible, and the second digital image scaling processing means is the logical sum between multiple lines according to the scaling ratio. The sub-scanning direction scaling means for realizing the above and the scaling in the main scanning direction change the run-length data indicating the switching point of the binary data according to the scaling factor, and further change the black pixel after reduction. De representing the number of consecutive With respect to portions where data is 0 to with the main scanning direction magnification processing means for performing processing to change 1, it is possible scaling process to prevent very lack of fast and the thin black line.

Example 1
Hereinafter, the image processing system according to the first embodiment of the present invention will be described for each component.

  FIG. 1 shows an overview of a digital multi-function peripheral suitable for applying this embodiment.

<Image input unit (scanner)>
In FIG. 1, a scanner unit 200, which is an image input device, illuminates an image on paper as a document, scans a CCD line sensor (not shown), and converts it into an electrical signal as raster image data. The manuscript paper is set on the tray 202 of the manuscript feeder 201, and when the user gives an instruction to start reading from the operation unit 400, the controller CPU 103 gives an instruction to the scanner 200. Perform a read operation.

<Image output unit (printer)>
In FIG. 1, a printer unit 300, which is an image output device, is a part that converts raster image data into an image on paper. The method is an electrophotographic method using a photosensitive drum or a photosensitive belt, or ink from a micro nozzle array. There is an ink jet method that prints an image directly on a sheet by discharging the ink, but any method may be used. Activation of the printing operation is started by an instruction from the controller CPU 103. The printer unit 300 has a plurality of paper feed stages so that different paper sizes or different paper orientations can be selected, and paper cassettes 302, 303, 304, and 305 corresponding to the paper feed stages are mounted. A paper discharge tray 306 receives paper that has been printed.

<Digital MFP control system configuration>
FIG. 2 shows a control system configuration of a digital multi-function peripheral that is suitable for applying this embodiment.

  The controller unit 100 is a controller for inputting / outputting image information and device information by connecting to a scanner 200 as an image input device and a printer 300 as an image output device, and connecting to a LAN 500 or a telephone line 600. is there.

  The CPU 103 functions as a controller that controls the entire digital multi-function peripheral.

  A RAM 107 is a system work memory for the CPU 103 to operate, and is also used as an image memory for temporarily storing image data.

  The ROM 108 is used as a boot ROM, and stores a boot program for the digital multifunction peripheral.

  An HDD 109 is a hard disk drive and stores system software, image data, and the like. The HDD 109 may store information such as an image output speed and an installation position related to a node connected to the network (LAN 500) for each address.

  The operation unit I / F 104 is an interface unit with the operation unit 400 and outputs image data to be displayed on the operation unit 400 to the operation unit 400. Also, it plays a role of transmitting information input by the user from the operation unit 400 to the CPU 103.

  A network I / F 105 is connected to the LAN 500 and inputs / outputs information. The modem 106 is connected to the public line 600 and performs modulation / demodulation processing for data transmission / reception.

  The above devices are arranged on the system bus 101.

  The image bus I / F 110 is a bus bridge that connects the system bus 101 and the image bus 102 that transfers image data at high speed, and converts the data structure.

  The image bus 102 is a high-speed bus such as a PCI bus or IEEE1394.

  The following devices are arranged on the image bus 102. A raster image processor (RIP) 111 expands a PDL code into a bitmap image. The device I / F unit 112 connects the scanner 100 and the printer 300, which are image input / output devices, to the controller 100, and performs synchronous / asynchronous conversion of image data. A scanner image processing unit 700 corrects, processes, and edits input image data. The printer image processing unit 800 performs correction, resolution conversion, and the like according to the printer on the print output image data. The transmission image processing unit 900 performs rotation, resolution conversion, color conversion, compression processing, and the like for image data transmission.

<Scanner image processing unit>
The configuration of the scanner image processing unit 700 is shown in FIG.

  The image bus I / F controller 701 is connected to the image bus 102 and controls the bus access sequence, and generates control and timing of each device in the scanner image processing unit 700. The table processing unit 702 performs table conversion in order to convert data read by the scanner into an image signal in a standard color space. The image area separation processing unit 703 determines an image area by detecting a character part from the input image, and generates an image area signal used for subsequent image processing. The filter processing unit 704 performs a convolution operation with a digital spatial filter according to a purpose such as edge enhancement. A background level detection unit 705 counts the frequency of pixel values in one page of an image, and detects a background level to be removed when image data or the like obtained by reading a document having an unnecessary light color in the background is sent. . For example, the editing unit 706 recognizes a closed area surrounded by a marker pen from the input image data, and performs image processing such as shading, shading, and negative / positive inversion on the image data in the closed area.

  The processed image data is transferred to the image bus 102 via the image I / F bus controller 701 again.

<Printer image processing unit>
The configuration of the printer image processing unit 800 is shown in FIG.
The image bus I / F controller 801 is connected to the image bus 102 and controls the bus access sequence and generates control and timing of each device in the printer image processing unit 800. The background removal processing unit 802 removes unnecessary light background color such as yellowish paper from the image data according to the setting from the operation unit or the result obtained by the background level detection unit 705. A color conversion processing unit 803 performs color conversion in accordance with the output characteristics of the printer. A resolution conversion unit 804 performs resolution conversion for converting image data received from the LAN 500 or the telephone line 600 into the resolution of the printer 300. The smoothing processing unit 805 performs a process of smoothing jaggy (image roughness appearing at a black and white border such as an oblique line) of the image data after resolution conversion.

<Image processing unit for transmission>
The configuration of the transmission image processing unit 900 is shown in FIG.

  The image bus I / F controller 901 is connected to the image bus 102 and controls the bus access sequence and generates control and timing of each device in the transmission image processing unit 900. The rotation processing unit 902 rotates the entire image in a direction suitable for transmission. The resolution conversion processing unit 903 converts the image into a resolution according to the setting from the operation unit. The background removal processing unit 904 removes unnecessary light background color such as yellowish paper from the image data according to the setting from the operation unit or the result obtained by the background level detection unit 705. A color conversion processing unit 905 converts the color space and color characteristics suitable for image transmission. The compression processing unit 906 performs processing for compressing the image.

<Operation unit>
FIG. 6 shows an operation unit 400 of a digital multi-function peripheral suitable for applying the present embodiment. The liquid crystal operation panel 401 is a combination of a liquid crystal and a touch panel, and displays setting contents, soft keys, and the like. A start key 402 is a hard key for instructing start of a copying operation and the like, and green and red LEDs are incorporated therein. The green LED is lit when the start is possible and the red LED is lit when the start is impossible. A stop key 403 is a hard key used to stop the operation. The hard key group 404 is provided with a numeric keypad, a clear key, a reset key, a guide key, and a user mode key.

  FIG. 7 shows a state in which a normal transmission screen is displayed on the liquid crystal operation panel 401. Function selection buttons 420 to 423 are used to select a function to be used among copy, transmission, box operation, and extended functions. FIG. 7 shows a state where the transmission function is selected. In the destination display area 424, the currently set transmission destination is displayed. The search from destination table button 425 is pressed to select a transmission destination from a destination table stored in advance in the device or a destination table stored in a place that can be referred to on the network. When the detailed information button 426 is pressed after selecting one of the destinations displayed in the destination display area 424, the detailed information of the destination is displayed. When the delete button 427 is pressed after selecting one of the destinations displayed in the destination display area 424, the selected destination is deleted. The call button 428 is used to call the setting of the transmission function that has been operated before. Only one of the new destination button 429, the routine work button 437, and the one-touch button 436 can be selected, and FIG. 7 shows a state where a new destination is selected. When the fax button 430, the e-mail button 431, the I-fax button 432, the file button 433, the save in box button 434, and the electronic paper button 435 are each pressed, the screen is switched to a screen where the destination setting can be directly input, and the destination is set on the screen. When the OK button is pressed, the set destination is added to the destination display area 424. The reading setting display area 438 displays the currently set reading resolution, color mode, and document type. The file format display area 439 displays the currently set file format for transmission. The transmission setting button 440 is used when performing detailed transmission settings. When the transmission setting button 440 is pressed, a screen for detailed transmission settings is displayed. Detailed settings at the time of transmission include scanning resolution, color mode (monochrome binary, monochrome multivalue, color, automatic color), document type (character photo, text, photo), file format (TIFF, PDF, MMR), image quality Settings (density adjustment, under color removal level setting, sharpness adjustment) and page settings (double-sided original, enlargement / reduction, page layout) are included.

<Image data transmission processing>
Here, as an example, a series of processing will be described with respect to the case of reading a document with the following settings and transmitting the image data.

Destination: E-mail address and fax number are specified one by one Original type: Character mode Resolution: 150 x 150 dpi
Color mode: Color Other default settings.

  FIG. 8 shows a transmission processing flow until image data is temporarily stored in the hard disk. When the start key 402 of the operation unit 400 is pressed, the scanner 200 starts scanning a document. The luminance data of RGB 3 channels is generated by the scanner, and is corrected to a standard color space by table conversion 702. Thereafter, an edge enhancement filter for the character mode is applied by the filter processing unit 704, and the background level is determined at 705. Up to this point, the processing content executed by the scanner image processing unit 700 has been described. Thereafter, the image data is subjected to the following processing in the transmission image processing unit 900. The rotation processing unit 902 rotates the image in a certain direction for transmission, and the resolution conversion processing unit 903 converts the resolution to 150 × 150 dpi specified by the operation unit at the start. The background removal processing unit 904 performs background color removal according to the setting from the operation unit or the result obtained by the background level detection unit 705. Thereafter, in order to generate two types of color data and black and white data for the same image, a color conversion processing unit 905 performs color conversion to color data suitable for image transmission, and a compression processing unit 906 performs JPEG compression, and a color conversion unit In 905, after conversion into black and white data suitable for image transmission, the compression processing unit 906 performs two systems of processing, including MMR compression. Both the color image data and monochrome binary image data thus created are temporarily stored in the hard disk 109.

  For e-mail transmission, color image data temporarily stored in the hard disk 109 is transmitted as it is attached to the e-mail. On the other hand, the processing shown in FIG. 9 is performed for fax transmission. The original image data is monochrome binary image data temporarily stored in the hard disk 109. The temporary storage image development 11 is performed before the transmission destination information acquisition 12 here. Depending on the case, it may be performed immediately before zooming 13 or may be performed immediately before compression 14. The transmission destination information is acquired at 12, and the scaling factor is determined from the resolution of the temporarily stored image (here 150 × 150 dpi), the document size, and the actual transmission resolution and the paper size determined from the acquired information. Is calculated. At the same time, the mode (any one of Standard, Fine, SuperFine, and UltraFine) that is the acquired destination information is stored in the RAM 107. Thereafter, the scaling process 13 is performed, details of which will be described later. The compression process is performed at 14 to generate transmission data, and the transmission data is transmitted at 15.

  FIG. 10 is a flowchart showing the scaling process 13 described above, and shows a characteristic part in this embodiment. Here, processing for determining which of the scaling method A and the scaling method B is applied is performed. First, in step S10-1, it is determined whether or not the document type designated by the operation unit is the character mode. If Yes, the process proceeds to step S10-2. In step S10-2, the fax mode to be transmitted, which is determined from the transmission destination information acquired in 12 of FIG. 9 and the resolution of the temporarily stored image, is used for determination. Here, the scaling method B is applied when the fax mode is Standard or Fine, and the scaling method A is applied otherwise. When it is determined No in step S10-1, the process proceeds to step S10-3, and it is determined whether or not the document type designated by the operation unit is the character / photo mode. Here, when the determination is No, that is, when the document type is the photo mode, the scaling method A is applied. If the determination is Yes, the process proceeds to step S10-4, and the fax mode to be transmitted, which is determined from the transmission destination information acquired in 12 of FIG. 9 and the resolution of the temporarily stored image, is used for the determination. Here, the scaling method B is applied when the fax mode is Standard, and the scaling method A is applied otherwise. FIG. 11 is a table showing the relationship between the transmission destination fax mode, the operation unit designated original type, and the scaling method determined in this way. In this embodiment, the method A is effective when the resolution after zooming is high to some extent or the document type is the photo mode, and the method B is suitable for the low resolution and character mode. Details of the scaling methods A and B will be described later. After the scaling method is determined as described above, the monochrome binary image temporarily stored at 150 × 150 dpi is subjected to scaling processing to a resolution corresponding to the fax mode to be transmitted and the paper size.

<Variation processing A>
FIG. 12 is a diagram for explaining the outline of the scaling process A. In order to determine the pixel value of the shaded portion that is the pixel after scaling from the pixels a, b, c, and d of the original image, an operation based on the linear interpolation method is performed.

  In a general linear interpolation method, the pixel values of the pixels a, b, c, and d are Va, Vb, Vc, and Vd, respectively, and the position of the pixel to be obtained is a distance (Wx, Wy from the pixel a as shown in FIG. ), The obtained pixel value is expressed by the following equation.

((1-Wx) ^* (1-Wy) ^* Va + Wx ^* (1-Wy) ^* Vb + (1-Wx) ^* Wy ^* Vc + Wx ^* Wy ^* Vd) (1)
In this embodiment, in order to particularly control the lack of black pixel information in the original image, a function for specifying the weight of the black pixel is added to this scaling method. The weight (Wblack) of the black pixel is defined by a decimal number from 0 to 1, and it corresponds to normal linear interpolation when this weight is 0.5. Wblack is a coefficient (black pixel: Pb, white pixel: Pw) determined by the following equation depending on how many black pixels (Nblack: 0 to 4) of the four pixels of the original image referred to by linear interpolation. ) Is applied to each pixel.

Black pixel coefficient
Pb = Wblack ^* 4 / (Nblack ^* Wblack + (4-Nblack) ^* (1-Wblak)) (2)
White pixel coefficient
Pw = (1-Wblack) ^* 4 / (Nblack ^* Wblack + (4-Nblack) ^* (1-Wblack)) (3)
As shown in FIG. 12, when the pixels a, b, and d are white (pixel value: W) and the pixel c is black (pixel value: B), the value of the pixel after zooming indicated by diagonal lines is given by the following equation. expressed.

((1-Wx) ^* (1-Wy) + Wx ^* (1-Wy) + Wx ^* Wy) ^* Pw ^* W + (1-WX) ^* Wy ^* Pb ^* B (4)
After the values corresponding to the number of pixels after scaling are obtained in this way, an operation based on a general error diffusion process is performed in order to determine each pixel value. In this embodiment, the error when the value of the pixel at the position indicated by * in the figure is determined is distributed to the peripheral pixels at a ratio as shown in FIG.

  The scaling process A is realized through the above process.

<Variation processing B>
FIG. 14 is a flowchart when a reduction process of a binary image is performed in the scaling process B. First, data is generated in a form in which the line is skipped in the sub-scanning direction according to the magnification and the magnification is changed only in the sub-scanning direction. Referring to the line skipped at this time, the scaled data is determined depending on whether or not there is black in the pixel at the same position in the main scanning direction. In this embodiment, the number of skipped lines is classified into four types of 0, 1, 2, 3 or more, and the target line is copied as it is, and if there is one black pixel with reference to two lines, the position thereof Is processed for black, similarly for 3 lines and 4 lines. Steps S14-1 to S14-3 represent classification in this case, and steps S14-4 to S14-7 represent a data generation method in each case. By performing this process, pixel data that is highly likely to contain important information such as black pixels or characters is prevented from being lost. Thereafter, reduction in the main scanning direction is performed. In step S14-8, the run-length data of the data subjected to scaling in the sub-scanning direction is reduced according to the scaling factor in the main operation direction. As a result, when the run-length data indicating black is 0 (when determined to be Yes at step S14-9), a process of changing to 1 is added at step S14-10. This processing also prevents the loss of pixel data that is likely to contain important information such as black pixels, that is, characters.

  FIG. 15 shows a processing example of this method. (A) is an original image, which is reduced to 60% in the main scanning direction and 50% in the sub-scanning direction. (B) shows the result of OR processing of two lines in the sub-scanning direction (if there is even one black pixel, it is black). (C) shows the run length data of (b) stored in black pixels. This is a result of reduction.

(Example 2)
In the above-described first embodiment, it is assumed that the application conditions of the scaling method A and the scaling method B are fixed. On the other hand, a system in which the device administrator can set the application conditions according to the user's use of fax will be described here.

  FIG. 16 shows a fax scaling method setting screen that can be handled only by a device administrator. The twelve toggle keys 450 are keys that are switched between the states A and B each time they are pressed. Here, the scaling method A or B is set depending on the destination fax mode and the document type set at the time of transmission. An OK key 451 is a button for saving the setting contents of this screen and closing the screen, and a cancel key 452 is a button for closing the screen without saving the setting contents on this screen. In the case of the setting as shown in FIG. 16, the conditional branch of the flowchart shown in FIG. 10 is changed, and the process shown in FIG. 17 is performed.

(Example 3)
In the first embodiment, it is assumed that the black pixel weight Wblack used in the scaling method A is designated as a fixed value. In contrast, a system in which the device administrator can adjust the black pixel weight Wblack in accordance with the user's use of fax will be described here.

  FIG. 18 is a detailed screen for setting a fax scaling method that can be handled only by a device administrator. The black pixel weight Wblack is displayed in the column 453, and the value is adjusted by the up and down arrow keys 454. The value that can be set here is from 0 to 1, and as the value approaches 1, the storability of black pixels increases, but depending on the characteristics of the image, the image is converted into a blackish image as a whole. An OK key 451 is a button for saving the setting contents of this screen and closing the screen, and a cancel key 452 is a button for closing the screen without saving the setting contents on this screen.

  By using the Wblack set on this screen in the equations (2) and (3), it is possible to adjust the image characteristics after scaling.

Overview of digital multi-function peripheral suitable for application of this embodiment Control system configuration diagram of a digital multi-function peripheral suitable for applying this embodiment Configuration diagram of the scanner image processing unit Configuration diagram of the printer image processing unit Configuration diagram of image processing unit for transmission Operation unit of digital multi-function peripheral suitable for applying this embodiment Liquid crystal display panel display example in the operation unit of FIG. Block diagram of transmission processing Block diagram of fax transmission processing Fax transmission time scaling process flow chart Applicable conditions for the 2 zooming method Illustration of zooming method A Illustration of zooming method A Flow chart of scaling method B Explanatory drawing of scaling method B Setting screen example used in the second embodiment Flow chart of processing applied in the second embodiment Setting screen example used in the third embodiment

Explanation of symbols

100 Controller unit 103 CPU
107 RAM
108 ROM
200 Scanner 300 Printer 400 Operation Unit 700 Scanner Image Processing Unit 800 Printer Image Processing Unit 900 Transmission Image Processing Unit

Claims (8)

  An image processing system having a fax transmission function, which includes a document reading unit for scanning a document and generating digital image data, and a document type as an option for switching image processing after scanning by a user. Document type setting means for designating one, first digital image scaling processing means, second digital image scaling processing means, fax transmission resolution determined from a negotiation result at the time of fax transmission, and the document A scaling processing method selection means for determining which of the first digital image scaling processing means and the second digital image scaling processing means is applied according to the document type set by the type setting means An image processing system comprising:   The first digital image scaling processing unit according to claim 1 is a binary image scaling method according to a value of a plurality of surrounding pixels of a target pixel and a distance between the target pixel and each of the plurality of surrounding pixels. Means for generating intermediate data by calculation using a weighting factor, and in order to generate a binary image from the intermediate data, errors generated when the target pixel value is determined to be 1 or 0 are sequentially distributed to a plurality of peripheral pixels An image processing system comprising: means for performing an error diffusion method.   The second digital image scaling processing unit according to claim 1 is a binary image scaling method, wherein the scaling in the sub-scanning direction is realized by a logical sum between a plurality of lines corresponding to the scaling ratio. The sub-scanning direction scaling means and the scaling in the main scanning direction change the run-length data indicating the switching point of the binary data according to the scaling factor, and at the time of reduction, the number of continuous black pixels after the change An image processing system comprising a main-scanning direction scaling process means for performing a process of changing the data representing 0 to 0 for a portion where the data representing 0 becomes 0.   4. The scaling processing method selecting means according to claim 1, wherein four types of fax transmission resolutions and 3 are selected in order to designate application conditions of the first digital image scaling processing means and the second digital image scaling processing means. An image processing system, further comprising means for setting from the operation unit, using various types of document types as parameters.   3. The intermediate data generating means included in the first digital image scaling processing means according to claim 2, further comprising means for setting coefficients from the operation unit in order to change the weights of the black pixels and white pixels of the original image. An image processing system. An image processing method having a fax transmission function, from among a document reading step for scanning a document and generating digital image data, and a document type as an option for switching image processing after scanning by a user A document type setting step for designating one, a first digital image scaling process step,
According to the second digital image scaling processing step, the fax transmission resolution determined from the negotiation result during fax transmission, and the document type set in the document type setting step, the first digital image scaling processing step and the first An image processing method comprising: a scaling processing method selection step for determining which of the two digital image scaling processing steps is applied.   A computer program for controlling an image processing system having a fax transmission function, an original reading step for scanning an original and generating digital image data, and an option for switching image processing after reading by a user The document type setting step for designating one of the document types, the first digital image scaling processing step, the second digital image scaling processing step, and the negotiation result at the time of fax transmission are determined. For determining whether to apply the first digital image scaling process step or the second digital image scaling process step in accordance with the fax transmission resolution and the document type set in the document type setting step. And a scaling processing method selection step. System control program.   A storage medium for storing the computer program according to claim 7.

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