JP4027508B2 - Image data processing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrophotographic image forming apparatus using digital image data, such as an optical printer such as a laser printer, a digital copying machine, or a plain paper facsimile apparatus, or an image data processing apparatus applied to an image display apparatus.
[0002]
[Prior art]
An image forming apparatus that prints out image data and an image display apparatus that displays image data on a display are character image data obtained by converting character code data using font data, or image image data read by an image scanner or the like. Is quantized and developed in a bitmap (dot matrix) form as binary data in a memory area on a memory (RAM), which is sequentially read out and sent as video data to an image forming unit (engine) for paper, etc. An image is formed on this recording medium, or a video signal is sent to a display to display the image on the screen.
In this type of image forming apparatus or image display apparatus, the digital image data in the form of a bitmap that has been quantized and developed on a memory (RAM) is sequentially read out and printed or displayed. The direction can only be changed stepwise in units of one dot. For this reason, jaggies in which straight lines or smooth curves that are inclined with respect to the orthogonal direction of the dot matrix are expressed in a staircase shape are produced, and characters and images (especially contour lines) are made as the original image or in a desired shape. It was difficult to form.
Therefore, in the image data processing apparatus described in Japanese Patent Application Laid-Open No. 5-207282, a window for extracting data of each dot in a predetermined area centering on a target dot of image data developed in a bitmap shape, A plurality of bits representing the feature of the line segment shape recognized for the target dot by recognizing the line segment shape of the boundary between the black dot region and the white dot region of the image data by the image data extracted through A pattern recognition unit that generates the code information, a determination unit that determines whether or not the dot needs to be corrected using at least a part of the code information, and a dot that is determined to be corrected by the determination unit Read out the correction data stored in advance using the code information generated by the pattern recognition means as an address and output it. That and a correction data memory.
[0003]
Here, the pattern recognition means includes code information indicating whether the dot to be recognized is a black dot or a white dot as code information representing the feature of the line segment shape recognized for each required dot. Code information including the code information indicating the inclination direction of the line segment, the code information indicating the degree of inclination, and the code indicating the position from the dot at the end of the line segment continuous in the horizontal or vertical direction of the target dot Is generated.
According to the image data processing device, the line segment shape of the boundary portion (the contour line of characters, etc.) between the black dot region and the white dot region of the image data expanded in a bitmap shape is recognized, and each required dot Is replaced with multi-bit code information, and at least a part of the code information is used to determine whether or not the dot needs to be corrected. Therefore, it is not necessary to create all feature patterns that need correction in advance as a template and store them in the memory, and it is possible to identify the dots that need correction and determine the correction data for the dots that need correction. It has become possible to use information easily and in a short time.
[0004]
[Problems to be solved by the invention]
Using the technique described in the above publication, when correcting the jaggy of the contour line for the image data developed in the form of a bitmap and improving the image quality, all the feature patterns that need to be corrected in advance are created as templates. It is no longer necessary to store the dots, and it is possible to easily determine the dot that needs to be corrected and determine the correction data for the dot that needs to be corrected using the above-described code information.
However, for dots that are determined not to require correction as the boundary between the black dot area and the white dot area of the image data, correction is performed regardless of what image the dot forms. Therefore, there is a problem that it is not possible to cope with the case where correction is required for these dots under conditions different from those of the boundary portion. For example, the bitmap of image data that represents halftone dots in the image data is mainly formed by isolated dot groups. In this case, since the dots in the halftone dots are isolated dots, the boundary portion In the pattern recognition for the target, it is not recognized as the target dot, and in the conventional technique, it was not the correction target. However, there is a case where it is desired to correct the halftone part at the same time as the correction of the boundary part.
Accordingly, the present invention provides an image data processing apparatus for improving image quality by correcting contour line jaggies for image data developed in the form of a bitmap, and at the same time as correcting contour lines such as characters. It is an object of the present invention to make it possible to perform correction on dots in the peripheral area of the contour line.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that a window for extracting data of each dot in a predetermined area centering on a target dot of image data expanded in a bitmap shape, and through the window Recognizing the line segment shape of the boundary between the black dot region and the white dot region of the image data based on the extracted image data, a plurality of bits representing the feature of the line segment shape recognized for the target dot A pattern recognition unit that generates code information, a determination unit that determines whether or not the dot needs to be corrected using at least a part of the code information, and a dot that is determined to be corrected by the determination unit A memory block that reads out and outputs correction data stored in advance with the code information generated by the pattern recognition means as an address; , In the image data processing apparatus comprising: the black dot of the image data expanded in the bitmap shape, the black dot is located at the right end with respect to the main scanning direction of the image data, the left end The black dot located in the main scanning direction, the black dot independent of the main scanning direction, or any other black dot. For each white dot, each white dot is relative to the main scanning direction of the image data. Edge peripheral discrimination means for discriminating between white dots located on the left side of black dots and white dots located on the right side, A part of the correction data to be output is determined according to the determination result of the edge periphery determination unit, only for the dots that are determined to be unnecessary as the dot of the boundary portion of the image data by the determination unit. thing It is characterized by.
According to a second aspect of the present invention, in the image data processing apparatus according to the first aspect, correction data to be output can be arbitrarily set in accordance with a determination result of the edge periphery determination means.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration example of a laser printer equipped with an image data processing apparatus of the present invention. As shown in the figure, the laser printer 2 includes a controller 3, an engine driver 4, a printer engine 5, and an internal interface (I / F) 6. The laser printer 2 receives print data transferred from the host computer 1, and the controller 3 receives page data. The data is developed into bitmap data, converted into video data which is dot information for driving the laser, sent to the engine driver 4 via the internal interface 6, and the printer engine 5 is sequenced to form a visible image on the paper. To do. The internal interface 6 is provided with a dot correction unit 7 which is an image data processing apparatus of the present invention, and image quality is improved by performing dot correction on the video data sent from the controller 3.
The controller 3 includes a microcomputer (hereinafter referred to as “MPU”) 31 that is a main control unit, a ROM 32 that stores programs, constant data, character fonts, and the like required by the MPU 31, and general data, dot patterns, and the like. It comprises a RAM 33 that temporarily stores, an I / O 34 that controls data input / output, and an operation panel 35 that is connected to the MPU 31 via the I / O 34. These components are connected to each other via a data bus, an address bus, a control bus, and the like.
An internal interface 6 including the host computer 1 and the dot correction unit 7 is also connected to the MPU 31 via the I / O 34.
[0007]
The engine driver 4 includes a microcomputer (hereinafter referred to as “CPU”) 41 that is a sub-control unit, a ROM 42 that stores programs and constant data required by the CPU 41, a RAM 43 that temporarily stores data, and data The I / O 44 controls the input / output of these, and these components are connected to each other via a data bus, an address bus, a control bus, and the like.
The I / O 44 is connected to the internal interface 6 and inputs video data from the controller 3 and various switch states on the operation panel 35, and outputs status signals such as an image clock (WCLK) and a paper end to the controller 3. To do.
The I / O 44 is also connected to a writing unit 26 and other sequence device group 27 constituting the printer engine 5 and various sensors 28 including a synchronization sensor described later.
The controller 3 receives commands such as a print command and print data such as character data and image data from the host computer 1, edits them, and if it is a character code, it is necessary for writing an image using a character font stored in the ROM 32. The data is converted into a dot pattern, and bitmap data of those characters and images (hereinafter collectively referred to as “images”) is developed in a video RAM area in the RAM 33 in units of pages.
[0008]
When the image clock WCLK is input together with the ready signal from the engine driver 4, the controller 3 converts the bitmap data (dot pattern) developed in the video RAM area in the RAM 33 as video data synchronized with the image clock WCLK. And output to the engine driver 4 via the internal interface 6. As will be described later, dot correction according to the present invention is performed on the video data by the dot correction unit 7 in the internal interface 6.
On the operation panel 35, there are provided a switch and a display (not shown) to control data according to an instruction from the operator, transmit the information to the engine driver 4, and display the status of the printer on the display. You can do that.
The engine driver 4 uses a video data input after dot correction via the internal I / F from the controller 3, and a writing unit 26 of the printer engine 5 and a sequence device group 27 such as a charging charger and a developing unit described later. And video data required for image writing are input via the internal I / F 6 and output to the writing unit 26, and signals indicating the state of each part of the engine are input from the synchronous sensor and other sensors 28. Or a status signal of a necessary information error situation (for example, a paper end) is output to the controller 3 via the internal I / F 6.
[0009]
FIG. 2 is a schematic configuration diagram showing the mechanism of the printer engine 5 in the laser printer 2.
In this laser printer 2, the paper 11 is fed from one of the upper and lower two-stage paper feeding cassettes 10a and 10b, for example, from the paper stack 11a of the upper paper feeding cassette 10a by the paper feeding roller 12, and the paper 11 is registered. The timing is adjusted by the roller 13 and the sheet is conveyed to the transfer position of the photosensitive drum 15.
The surface of the photosensitive drum 15 that is rotationally driven by the main motor 14 in the direction indicated by the arrow is charged by the charging charger 16 and scanned with the PWM modulated laser beam L from the writing unit 26 so that the electrostatic latent image is formed on the surface. An image is formed.
This latent image is visualized by the adhesion of the toner supplied from the developing unit 17, and the toner image is transferred onto the paper 11 conveyed by the registration roller pair 13 by the action of the transfer charger 18 and transferred. The sheet thus separated is separated from the photosensitive drum 15, sent to the fixing unit 20 by the conveying belt 19, pressed against the fixing roller 20b by the pressure roller 20a, and fixed by the pressure and heat of the fixing roller 20b.
The sheet that has passed through the fixing unit 20 is discharged by a discharge roller 21 to a discharge tray 22 provided on the side surface of the printer main body. On the other hand, the toner remaining on the photosensitive drum 15 is removed and collected by the cleaning unit 23. A plurality of printed circuit boards 24 constituting a controller 3, an engine driver 4 and an internal I / F 6 are mounted above the laser printer 2.
[0010]
FIG. 3 is a perspective view showing a principal part of a configuration example of the writing unit 26 shown in FIG.
The writing unit 26 includes an LD unit 50, a first cylinder lens 51, a first mirror 52, an imaging lens 53, a disk type motor 54, and a polygon mirror 55 rotated thereby in the direction of arrow A. A rotation deflector 56, a second mirror 57, a second cylinder lens 58 and a third mirror 60, a condensing lens 61 composed of a cylinder lens, and a synchronization sensor 62 composed of a light receiving element.
The LD unit 50 incorporates therein an LD and a collimator lens that converts a divergent beam emitted from the LD into a parallel light beam.
The first cylinder lens 51 functions to shape the parallel light beam emitted from the LD unit 50 in the sub-scanning direction on the photosensitive drum 15, and the imaging lens 53 reflects the parallel light reflected by the first mirror 52. The beam is converted into a convergent beam and is incident on the mirror surface 55 a of the polygon mirror 55.
The polygon mirror 55 is an R polygon mirror formed by curving each mirror surface 55a, and is a post-object type that does not use an fθ lens that has been disposed between the mirror mirror 55a and the second mirror 57. The rotating polarizer 56 of the type in which the device is arranged) is configured.
The second mirror 57 reflects the beam (scanning beam) reflected and deflected by the rotating polarizer 56 toward the photosensitive drum 15. The scanning beam reflected by the second mirror 57 passes through the second cylinder lens 58 and forms an image as a sharp spot on the main scanning line 15 a on the photosensitive drum 15.
The third mirror 60 is disposed outside the scanning area on the photosensitive drum 15 by the light beam reflected by the rotary polarizer 56 and reflects the incident light beam toward the synchronization sensor 62 side. The light beam reflected by the third mirror 60 and collected by the condenser lens 61 is converted into a synchronization signal for keeping the scanning start position constant by a light receiving element such as a photodiode constituting the synchronization sensor 62.
[0011]
FIG. 4 is a block diagram showing a schematic configuration of the dot correction unit 7 in FIG. 1, and FIG. 5 is a diagram showing a specific configuration example of the main parts (FIFO memory 72 and window 73).
As shown in FIG. 4, the dot correction unit 7 includes a parallel / serial converter (hereinafter referred to as “P / S converter”) 71, a FIFO memory 72, a window 73, a pattern recognition unit 74, a memory block 75, and a video data output unit 76. And a timing control unit 77 that controls them synchronously.
When the video data transferred from the controller 3 shown in FIG. 3 is parallel (8-bit) data, the P / S converter 71 is provided to convert the video data into serial (1-bit) data and send it to the FIFO memory 72. It is basically not involved in dot correction. When the video data transferred from the controller 3 is serial data, the P / S converter 71 is not necessary.
The FIFO memory 72 is a first-in first-out memory, and stores video data for a plurality of lines (six lines in the example of this embodiment) sent from the controller 3 as shown in FIG. Line buffers 72a to 72f to be connected are serially connected.
[0012]
As shown in FIG. 5, the window 73 includes one line of serial video data sent from the controller 3 via the P / S converter 71 and six lines outputted from the line buffers 72a to 72f of the FIFO memory 72. 11 bits of shift registers 73a to 73g are serially connected to a total of 7 lines of data and constitute a pattern detection window (sample window: an example of its shape is shown in FIG. 6). is doing.
The middle bit (indicated by x in FIG. 5) of the center shift register 73d is the storage position of the target dot of interest. Of the shift registers 73a to 73g constituting the window 73, 7 bits are sufficient for the shift registers 73a and 73g, and 8 bits are sufficient for the shift registers 73b and 73f. Therefore, the portion indicated by the broken line in FIG.
As the video data is sequentially shifted one bit at a time in the line buffers 72a to 72f constituting the FIFO memory 72 and the shift registers 73a to 73g constituting the window 73, the noticed dots change sequentially. The video data in the center window 73 can be extracted continuously.
Based on the dot information extracted from the window 73, the pattern recognizing unit 74 sets the target dot (target dot) and its surrounding information, particularly the line segment shape of the boundary between the black dot and the white dot of the image data. The feature is recognized, and the recognition result is output as code information in a predetermined format. This code information becomes the address code of the memory block 75.
[0013]
FIG. 7 is a block diagram showing the internal configuration of the pattern recognition unit 74 and the relationship with the window 73. A window 73 as a sample window includes a central 3 × 3 bit core area (Core) 73C, an upper area (Upper) 73U, a lower area (Lower) 73D, a left area (Left) 73L, and a right area (Right). ) 73R. The pattern recognition unit 74 includes a core region recognition unit 741, a peripheral region recognition unit 742, multiplexers 743 and 744, a gradient calculation unit 745, a position calculation unit 746, a determination unit 747, and a gate 748. The peripheral region recognition unit 742 is further configured by an upper region recognition unit 742U, a right region recognition unit 742R, a lower region recognition unit 742D, and a left region recognition unit 742L.
In this embodiment, the area division of the window for matching and its detection pattern and use area, each output signal from each block 741 to 748 constituting the pattern recognition unit 74, each block in the pattern recognition unit 74 Since the operation and the dot correction method are the same as those of the image data processing apparatus described in Japanese Patent Laid-Open No. 5-207282 cited as the prior art, description thereof is omitted here.
[0014]
FIG. 9A is a block diagram showing the relationship between the pattern recognition unit 74 and the memory block 75. The memory block 75 is configured as a pattern memory, and the memory block 75 reads correction data (10 bits) stored in advance using the code information of the code information (12 bits) output from the pattern recognition unit 74 as an address. Output video data for driving. This is a corrected dot pattern.
The correction data output from the memory block 75 is an integral multiple of a value obtained by dividing the normal width, that is, the laser emission time, into a plurality of dots for each dot of video data sent from the controller 3 (the maximum value in the case of 10 divisions). Is output in parallel as 10 times) information.
The video data output unit 76 serializes the parallel information output from the memory block 75 and sends it to the printer engine 4 to turn on / off the laser diode of the LD unit 50 that is a light source provided in the writing unit 26. A signal source.
However, the ON / OFF control of the laser diode of the LD unit 50 in the above description assumes control based on binary data. However, if control based on multi-value data is assumed, the video data output unit 76 described above. It is not necessary to serialize the parallel information output from the memory block 75 and send it to the printer engine 4, and the parallel information from the memory block 75 is used as it is in the LD unit 50 (in this case, the multi-value control LD unit is shown). Writing by the writing unit 26 is performed by corresponding to the multi-value image data related to ON / OFF of the laser diode and power control.
[0015]
Assuming the above device configuration, Of the present invention The configuration and operation will be described. Figure 8 The first of the present invention FIG. 7 is a block diagram of a dot correction unit 7 showing an embodiment, and is obtained by adding an edge periphery determining means 78 to the configuration of FIG. The edge periphery determination means 78 receives either serial data converted from parallel data by the P / S converter 71 or serial data directly transferred from the controller 3. Based on the input serial data, the edge periphery discriminating means 78 has a black dot at the right end, a black dot at the left end with respect to the main run direction of the image data, a black dot isolated with respect to the main scanning direction, and the like. A total of seven different states are determined as to whether the black dot is a white dot on the left side of the black dot with respect to the main scanning direction, a white dot on the right side, or another white dot. Bit decode signals (ED0, ED1, ED2) are output to the pattern recognition unit 74. Then, in the pattern recognition unit 74, as shown in FIG. 10, 3 is the discrimination result of the edge periphery discrimination means 78 for the multi-bit code information representing the feature of the line segment shape recognized for the target dot. Code information is generated again by the bit decode signals (ED0, ED1, ED2).
[0016]
In FIG. 10, the decode signals (ED0, ED1, ED2) input to the pattern recognition unit 74 are input to the inclination calculation unit 745 and the position calculation unit 746, and represent the characteristics of the line segment shape recognized for the target dot. By using the total 8 bits of G0-3 and P0-3 among the multiple bits of code information as parameters for generating code information, the discrimination result of the edge periphery discrimination means 78 is added to the correction data determination condition. It becomes possible. More than The first of the present invention It is an example of an embodiment. FIG. The second of the present invention It is a block diagram which shows the internal structure of the pattern recognition part 74 which shows embodiment, and the relationship with the window 73, and is provided with the edge condition selection hand throw 749 in addition to the structure of FIG. In this case, the decode signals (ED0, ED1, ED2) input to the pattern recognition unit 74 are first input to the edge condition selection hand throw 749. The edge condition selection hand throw 749 selects whether to input a decode signal to the slope calculation unit 745 and the position calculation unit 746 based on the NO-MATCH signal from the determination unit 747. In other words, as a result of the NO-MATCH signal recognizing the line segment shape of the boundary between the black dot area and the white dot area for each target dot, the dot determined to be unnecessary for correction as the dot at the boundary part of the image data. Only when it is shown, decode signals (ED0, ED1, ED2) are input to the inclination calculation unit 745 and the position calculation unit 746, and code information of a plurality of bits representing the feature of the line segment shape recognized for the target dot is displayed. The total 8 bits of G0-3 and P0-3 are used as parameters for generating code information. As a result, the discrimination result of the edge periphery discrimination means 78 can be added to the determination condition of the correction data, and each black dot and the white dot adjacent to the black dot are arranged at any position with respect to the main scanning direction of the image data. Based on the result of the determination of whether or not the correction has been made, the correction data can be individually replaced. More than The second of the present invention It is an example of an embodiment.
[0017]
FIG. 9 (b) The third of the present invention It is a block diagram which shows the relationship between the pattern recognition part 74 and memory block 75 which show embodiment. In FIG. 9B, the pattern recognition unit 74 in FIG. 7, FIG. 10, and FIG. 11 causes each dot of interest to correspond to the rightmost black dot, the leftmost black dot, and the main scanning direction with respect to the main scanning direction of the image data. The memory block 75 based on the code information when the code information including the information of the total of four states, such as the isolated black dot and other white or black dots, can be output to the memory block 75. It is the figure which showed the example of allocation of the address. In FIG. 9B, the memory block 75 is roughly classified into two areas, and stores correction data as a result of recognizing the line segment shape of the boundary between the black dot area and the white dot area for each target dot. There are a boundary line correction area to be corrected, and a main scanning edge correction area for storing correction data as a recognition result of the position of each dot of interest with respect to the main scanning direction. Further, in the latter case, each target dot corresponds to the rightmost black dot, the leftmost black dot, the isolated black dot in the main scanning direction, the other black dots, the main scanning direction in the main scanning direction of the image data. In order to store correction data unique to seven states including white dots on the left side of the black dots, white dots on the right side of the black dots in the main scanning direction, and other white dots, seven correction data can be stored. The address is numbered separately from the area for storing correction data as a result of recognizing the line segment shape at the boundary between the black dot area and the white dot area for each of the noted dots. Accordingly, since the user can set the correction data output according to the determination result for each target dot to an arbitrary value, the degree of freedom when selecting the correction data can be improved and the correction data selection time can be shortened. . More than The third of the present invention It is an example of an embodiment.
[0018]
FIG. 13 shows the effect of image correction including the boundary portion (edge portion) and the peripheral portion of the image according to the above embodiment. FIG. 13A shows original image data developed in a bitmap shape, and FIG. 13B shows a region recognized as a boundary portion between a black dot region and a white dot region, and other regions. A case where image correction is performed on an area recognized as an isolated dot in the main scanning direction is illustrated.
In the above, the timing control unit 77 includes an FGATE signal that defines a writing period for one page from the engine driver 4, an LGATE signal that defines a writing period for one line, an LSYNC signal that indicates the writing start and end timing of each line, An image clock WCLK and a RESET signal that take a reading and writing cycle for each dot are input, and a clock signal and the like necessary for synchronizing the operation are generated for each of the above-described unit blocks 71 to 76.
The correction data in the pattern memory 75 can be selectively loaded from the ROM 32 or the ROM 42 by the MPU 31 of the controller 3 or the CPU 41 of the engine driver 4 or downloaded from the host computer 1. It is possible to easily change the correction data for the pattern to be corrected.
In the above embodiment, the case where the dot correction unit 7 as the image data processing apparatus according to the present invention is provided in the internal interface 5 connecting the controller 3 of the laser printer 2 and the engine driver 4 has been described as an example. The dot correction unit 7 may be provided on the controller 3 side or the engine driver 4 side.
Further, the present invention is not limited to a laser printer, and various image forming apparatuses that form an image by developing it into a bitmap, such as an LED printer or other various optical printers, a digital copying machine, a plain paper facsimile, and the image formed thereby. The present invention can be similarly applied to an image display device that displays.
[0019]
【The invention's effect】
As described above, the present invention has the following excellent effects. Book According to the invention, for each black dot in the image data developed in the form of a bitmap, each black dot is the rightmost black dot, the leftmost black dot, the main scanning direction with respect to the main scanning direction of the image data. For each white dot, each white dot is a white dot on the left side of the black dot with respect to the main scanning direction of the image data, Since it is determined which white dot is on the right side, and a part of the correction data to be output as image data is determined based on the determination result, each dot of interest is simultaneously corrected as a contour line of characters, etc. On the other hand, it is possible to replace the correction data for each discrimination result.
Also book According to the invention, each black dot of the image data developed in a bitmap shape that is not recognized as a dot (particularly a contour line of a character or the like) of the image data but is determined to be unnecessary as a contour line, and With respect to white dots adjacent to black dots, the determination result of each black dot and the white dot adjacent to the black dot is arranged with respect to the main scanning direction of the image data. A replacement can be made.
Also book According to the invention, the correction data output according to the determination result for each target dot can be set to an arbitrary value by the user, so that the degree of freedom in selecting correction data is improved and the correction data selection time is shortened. Can be achieved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration example of a laser printer equipped with an image data processing apparatus of the present invention.
2 is a schematic configuration diagram showing a mechanism of a printer engine mounted on the laser printer shown in FIG. 1; FIG.
3 is a perspective view of a principal part showing a configuration example of a writing unit shown in FIG. 1. FIG.
4 is a block diagram showing a schematic configuration of a dot correction unit shown in FIG. 1; FIG.
FIG. 5 is a diagram illustrating a specific configuration example of a main part of the dot correction unit illustrated in FIG. 4;
6 is an explanatory diagram showing an example of the shape of the window shown in FIG. 5. FIG.
7 is a block diagram showing an internal configuration of a pattern recognition unit in FIG. 5 and a relationship with a window. FIG.
FIG. 8 is a block diagram of a dot correction unit as an image data processing apparatus showing an embodiment of the present invention.
FIGS. 9A and 9B are block diagrams illustrating the relationship between a pattern recognition unit and a memory block according to an embodiment of the present invention.
FIG. 10 is a block diagram showing a relationship between an internal configuration of a pattern recognition unit and a window in an embodiment corresponding to claim 1;
11 is a block diagram showing the internal configuration of a pattern recognition unit and the relationship with windows in an embodiment corresponding to claim 2. FIG.
12 is an explanatory diagram illustrating the operation content of the edge periphery determination unit shown in FIG. 10;
13A and 13B are diagrams illustrating the effect of image correction according to the embodiment of the present invention, in which FIG. 13A illustrates an original image before correction, and FIG. 13B illustrates an image after correction;
[Explanation of symbols]
7 dot correction unit (image data processing device), 72 FIFO memory, 72a to 72f line buffer, 73 window, 73a to 73g shift register, 74 pattern recognition unit (pattern recognition unit, discrimination unit), 75 memory block, 76 video data An output unit, 77 a timing control unit, 78 an edge periphery discrimination means;

Claims (2)

A window for extracting data of each dot in a predetermined area centering on a target dot of image data developed in a bitmap shape;
By recognizing the line segment shape of the boundary between the black dot region and the white dot region of the image data by the image data extracted through the window, the feature of the recognized line segment shape is expressed for the target dot. Pattern recognition means for generating multi-bit code information;
A discriminating means for discriminating whether or not the dot needs to be corrected using at least a part of the code information;
A memory block that reads out and outputs correction data stored in advance with the code information generated by the pattern recognition unit as an address for the dots determined to be corrected by the determination unit ;
In an image data processing apparatus comprising:
For each black dot in the image data developed in the bitmap form, each black dot is located at the right end with respect to the main scanning direction of the image data, the black dot located at the left end, and the main scanning direction. For each white dot, the white dot is located on the left side of the black dot with respect to the main scanning direction of the image data. An edge periphery discrimination means for discriminating between a dot and a white dot located on the right side;
A part of the correction data to be output is determined according to the determination result of the edge periphery determination unit, only for the dots that are determined to be unnecessary as the dot of the boundary portion of the image data by the determination unit. An image data processing apparatus. Image data processing apparatus according to claim 1, characterized in that a arbitrarily set the correction data to be output according to the determination result of the edge around the discriminating means.

Images