JP5195340B2 - Image processing apparatus, image processing method, image processing program, and recording medium - Google Patents

Description

  The present invention relates to an image processing apparatus, an image processing method, an image processing program, and a recording medium. The present invention relates to a method, an image processing program, and a recording medium.

  In an image processing apparatus that performs predetermined image processing on image data, for example, a copying apparatus including an electrophotographic image forming unit, the image data is transferred from the image processing unit to the electrophotographic image forming unit. The image forming unit forms an image on a sheet or the like based on the image data. In an image forming apparatus including such an electrophotographic image forming unit and an image processing unit, the image processing unit is a main controller including a CPU (Central Processing Unit) that controls the entire image forming apparatus and the like. Since it is necessary to frequently send and receive various commands and data, it can be mounted on the main controller board with this main controller, or it can be mounted on a board other than the main controller board with its own board or other circuit components. Located near the main controller board. On the other hand, an electrophotographic image forming unit performs laser diode lighting control on the basis of a laser diode (Laser Diode: LD) that emits a laser beam and image data transferred from the image processing unit. A laser drive unit that emits a laser beam modulated according to the optical unit such as a polygon mirror and a lens that forms an electrostatic latent image by scanning the laser beam from a laser diode onto a uniformly charged photosensitive member. A developing unit that supplies toner to the electrostatic latent image on the photosensitive member to develop the toner image, a transfer unit that transfers the toner image on the photosensitive member from the paper feeding unit to the paper conveyed by the conveying unit, and a toner image The toner image is transferred by heating and pressurizing the paper to fix the toner image, and then discharged to the paper output tray. -A cleaning / static discharge unit that cleans and discharges the photoreceptor after image transfer and a charging unit that uniformly charges the cleaned photosensitive member for image formation again, and so on. Therefore, as the component arrangement of the internal configuration of the image forming apparatus, it is arranged at a position relatively distant from the image processing unit, and the degree of freedom of the arrangement is required. Particularly, in a wide-width image forming apparatus that forms an image on A0 size paper, an image processing unit and an image forming unit, in particular, an image processing unit and a laser driving unit of an image forming unit to which image data is transferred from the image processing unit. Is, for example, arranged at a distance of 3 m or more, and image data is transferred between the image processing unit and the image forming unit arranged at a predetermined distance.

  In recent years, image forming apparatuses have been demanded to increase the processing speed, and color image data has been processed more and more, and it has become necessary to transfer image data at high speed. . Therefore, in recent years, in an image forming apparatus, in image transfer with a relatively long distance, such as between the image processing unit and the image forming unit, in order to transfer image data at high speed, LVDS (Low Image data has been transferred at high speed using a small-amplitude high-speed differential signal (clock) such as voltage differential signaling.

  However, in data transfer using a high-speed differential signal such as LVDS, there is a possibility that a transfer error may occur although there is very little probability, and a high-speed differential signal such as PCI (Peripheral Component Interconnect) -Express In a data transfer technique using a connection bus, a recovery system such as data retransmission is mounted when a transfer error occurs. It is said that the probability of occurrence of errors in this LVDS transmission line is a low probability of 10-12 or less. For example, this probability of occurrence is 1 page A3 1200 dpi image (2 bits, 8000 pixels x 10000 line) on 50000 pages, This is the probability of occurrence of an abnormal value at one location.

  Conventionally, when image data is transferred from a hard disk to a RAM (Random Access Memory), and image data is transferred from the RAM to the image forming unit, an estimated transfer time is obtained in advance, and the estimated transfer time Based on this, there is proposed a technique for controlling the start of image data transfer from the RAM to the image forming unit when it is determined that an error has occurred in data transfer from the hard disk to the RAM (see Patent Document 1).

  In other words, this conventional technique limits the start of image data transfer from the RAM to the image forming unit when a transfer error occurs when image data is transferred from the hard disk to the RAM that transfers the image data to the image forming unit. Thus, an attempt is made to prevent the occurrence of an abnormal image in the printing result.

  Conventionally, an image forming apparatus has a front / back scaling function for scaling an image in order to correct the difference in size of images formed on the front and back sides of the paper in accordance with the shrinkage / expansion of the paper. In this front / back scaling function, the number of lines transferred from the image processing unit to the image forming unit is changed at a predetermined line cycle. For example, in the copy mode, normally, for one scan, 10 lines of data are transferred from the image processing unit to the image forming unit at a cycle of 11 lines, and the image forming unit is based on the transferred image data. The image is formed, but at the time of reduction or enlargement, the data transfer amount is changed to perform image reduction processing or image enlargement processing. That is, at the time of image reduction, 11 lines of data are transferred from the image processing unit to the image forming unit in an 11-line cycle to reduce the image data of 11 lines to 10 lines, and image formation is performed. Data transfer for 9 lines within the cycle is performed from the image processing unit to the image forming unit, and image formation is performed by enlarging the 9 lines of image data to 10 lines.

JP 2008-078725 A

  However, in the above-described prior art, when an error occurs in the transfer of image data, the transfer image data is lost on a line-by-line basis, or it becomes difficult to determine the transfer line, an appropriate action is taken. Therefore, it is necessary to improve the image quality.

  That is, according to the prior art described in the publication, when a transfer error occurs in the data transfer from the hard disk to the RAM, the image quality is improved by controlling the transfer of the image data from the RAM to the image forming unit. As shown, a transfer error that occurs when image data is transferred from the RAM to the image forming unit by high-speed transfer is not dealt with and needs to be improved.

  As described above, the image processing unit provided with such a RAM or the like and the image forming unit are relatively distant from each other as an arrangement distance in the image forming apparatus. When image data is transferred from the image processing unit to the image forming unit using high-speed transfer technology such as Image formation is performed sequentially based on the data.

  Therefore, when image data is transferred from the image processing unit to the image forming unit by the high-speed transfer technology, even if an error occurs in the transfer of the image data, the image forming unit sequentially forms an image based on the image data. There is a need for a technique for dealing with transfer errors that occur with respect to image data transmitted from the image processing unit to the image forming unit. Further, there is a demand for a technique that appropriately copes with the occurrence of a transfer error in image data transfer for realizing the above-described front / back scaling function.

  Therefore, the present invention provides an image processing apparatus, an image processing method, an image processing program, and an image processing apparatus capable of optimizing a transmission image even when a transmission error occurs in image data transmitted from the image transmission side to the image reception side. The object is to provide a recording medium.

  In order to achieve the above object, the present invention provides an image transmission side unit that performs high-speed transfer of line image data from an image transmission side unit to an image reception side unit and performs predetermined image processing on the image reception side unit. A head code and a rear end code are added to the head and rear end of the line image data and transmitted, and the image receiving unit determines whether the line image data is valid or invalid based on the head code and the rear end code. When the predetermined image processing is executed for the effective line image data with the predetermined number of reference processing lines as the reference image processing unit, if the line image data is invalid, the invalid line image data is discarded and the image An invalid notification is sent to the transmission side, and a complementary label is generated based on a predetermined number of line image data in the reference image processing unit to which the line image data for which the image transmission side has been notified belongs. And generates an emission image data transmitted to the image receiving side, the image receiving side has the complementary line image data and executes image processing by performing a data interpolation process to the line image data the destroyed.

  According to the present invention, the image receiving side applies to the line image data of the number of lines between the maximum number of processing lines greater than the number of reference processing lines and the minimum number of processing lines smaller than the number of reference processing lines in the reference image processing unit. A unit processing start signal is transmitted to the image transmission side when processing the first line image data of the reference image processing unit, and each time the unit processing start signal is transmitted, the image transmission side transmits the unit processing start signal. The complementary line image data may be generated from line image data belonging to an image processing unit, and when the invalidity notification signal is sent, the complementary line image data is transmitted to the image receiving side.

  Further, in the present invention, the image receiving side transmits the invalidity notification signal and the unit processing start signal using the same signal line as the data transfer start signal, and as the invalidity notification signal and the unit processing start signal, A signal obtained by changing the signal form of the data transfer start signal may be used.

  Further, according to the present invention, as the number of lines processed by the image receiving side in the reference image processing unit, the number of reference processing lines, the maximum number of processing lines larger than the reference processing line number, or the maximum number of processing lines or the number of reference processing lines In addition, the number of lines between the minimum number of processing lines of a predetermined number of lines is designated as the number of designated processing lines, the line image data processing of the designated number of processing lines is executed, the data transfer start signal is output for each processing line, and When the processing of the first line image data of the reference image processing unit is started, the unit processing start signal is output, and when the designated processing line number of the reference image processing unit in which the invalid line image data is generated is the maximum processing line number, The number of lines increased by one line to the maximum number of processed lines is set as the number of designated processing lines in the reference image processing unit, and the complementary line image data. Processing and allow the next specified processing line in the reference image processing unit not occur in the invalid line image data may be characterized in that reducing one line.

  According to the present invention, it is possible to optimize the transmission image even when a transmission error occurs in the image data transmitted from the image transmission side to the image reception side.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, since the Example described below is a suitable Example of this invention, various technically preferable restrictions are attached | subjected, However, The range of this invention is unduly limited by the following description. However, not all the configurations described in the present embodiment are essential constituent elements of the present invention.

  1 to 10 are diagrams illustrating a first embodiment of an image processing apparatus, an image processing method, an image processing program, and a recording medium according to the present invention. FIG. 1 illustrates an image processing apparatus, an image processing method, 1 is a schematic front view of a digital composite apparatus 1 to which a first embodiment of an image processing program and a recording medium is applied.

  In FIG. 1, the digital multi-function apparatus 1 has a configuration in which a paper feeding unit 100, a printer unit 200, and a scanner unit 300 are sequentially stacked. On the scanner unit 300, an automatic document feeder (hereinafter referred to as ADF). .) 400 is mounted.

  The printer unit (image forming unit) 200 includes four process cartridges 210C, 210M, 210Y, and 210K for forming images of each color of cyan (C), magenta (M), yellow (Y), and black (K). (Hereinafter, referred to as process cartridges 210C to 210K as appropriate), optical writing unit 230, intermediate transfer unit 240, secondary transfer unit 250, registration roller pair 260, belt fixing type fixing unit 270, and A paper reversing unit 280 and the like are provided.

  As will be described later, the optical writing unit 230 converts the laser beam bundle modulated based on the image data of each color into the photoconductors 211C, 211M, 211Y, and 211K (hereinafter, the photoconductor 211C) of the process cartridges 210C to 210K of each color. To 211K) to form electrostatic latent images of images of the respective colors on the photoreceptors 211C to 211K. The process cartridges 210C to 210K include drum-shaped photoconductors 211C to 211K, a charger, a developing device, a drum cleaning unit, a static eliminator, and the like. The printer unit 200 uniformly charges the surfaces of the photoconductors 211C to 211K with the chargers of the process cartridges 210C to 210K, and converts the image data of each color from the optical writing unit 230 onto the surfaces of the photoconductors 211C to 211K. The laser beam bundle modulated and deflected based on the laser beam is irradiated to form an electrostatic latent image for each color. The printer unit 200 supplies toner of each color from the developing unit to the photoconductors 211C to 211K of the process cartridges 210C to 210K of each color, develops the electrostatic latent image, and forms a toner image of each color. The printer unit 200 transfers the toner images formed on the photoconductors 211C to 211K of the process cartridges 210C to 210K to the intermediate transfer belt 241 of the intermediate transfer unit 240, and remains on the surfaces of the photoconductors 211C to 211K after the transfer. The transfer residual toner to be cleaned is cleaned by a drum drum cleaning unit, and the cleaned photoconductors 211C to 211K are discharged by a charge eliminator and uniformly charged by a charger to be used for image formation again.

  In the intermediate transfer unit 240, an intermediate transfer belt 241 is stretched around a plurality of rollers, and an intermediate transfer roller is disposed at a position facing each of the photoreceptors 211C to 211K across the intermediate transfer belt 241. Yes. The intermediate transfer belt 241 is formed in an endless belt shape, and is rotated and moved in a clockwise direction indicated by an arrow in FIG. The printer unit 200 applies an intermediate transfer voltage to each intermediate transfer roller to sequentially superimpose and transfer the toner images on the photoconductors 211C to 211K, thereby forming a color toner image on the intermediate transfer belt 241. To do. The printer unit 200 transfers the color toner image on the intermediate transfer belt 241 to a sheet (recording medium) conveyed between the secondary transfer unit 250 and the intermediate transfer belt 241 from the paper feeding unit 100. Then, the sheet is secondarily transferred and the sheet on which the color toner image is transferred is conveyed to the fixing unit 270.

  In the printer unit 200, a registration roller pair 260 is disposed on the upstream side of the nip portion between the secondary transfer unit 250 and the intermediate transfer belt 241 in the sheet conveyance direction. A sheet is conveyed from the sheet feeding unit 100 into the printer unit 200. The printer unit 200 feeds the sheet with the color toner image on the intermediate transfer belt 241 while adjusting the timing by the registration roller pair 260, and sends the color toner image on the intermediate transfer belt 241 to the secondary transfer unit 250 and the intermediate transfer belt 241. Secondary transfer is performed on the paper at the nip portion. The printer unit 200 transports the paper on which the full-color image is formed in this way to the fixing unit 270 by the secondary transfer unit 250, and heats and presses the paper while transporting the paper by the fixing unit 270, so that the color toner Fix the image on the paper.

  The printer unit 200 transports the paper that has passed through the fixing unit 270 by switching the claw 201 to the paper discharge unit outside the apparatus and the paper reversing unit 280, and the paper reversing unit 280 flips the fed paper upside down. After that, the sheet is conveyed again between the intermediate transfer belt 241 and the secondary transfer unit 250 of the intermediate transfer unit 240 through the registration roller pair 260.

  The paper feed unit 100 includes a multi-stage paper feed cassette 101, a paper transport unit 102, and the like. Each paper feed cassette 101 can store a plurality of sheets of different paper sizes and types. The sheet feeding unit 100 separates the sheets in the sheet feeding cassette 101 one by one and sends them to the sheet conveying unit 102, and the sheets fed from the sheet feeding cassette 101 are conveyed to the printer unit 200 by the sheet conveying unit 102.

  The scanner unit 300 includes a contact glass 301 and a document reading unit 302 that reads a document on the contact glass 301. An ADF 400 is disposed on the contact glass 301 so as to be openable and closable. When the ADF 400 is opened, the upper surface of the contact glass 301 is opened so that a document can be set on the contact glass 301. When the document is closed on the contact glass 301, the ADF 400 contacts the document. It functions as a pressing plate that is pressed onto the glass 301. The ADF 400 includes a document table 401, a document conveyance unit 402, and the like. A plurality of documents set on the document table 401 are separated one by one by the document conveyance unit 402 and conveyed onto the contact glass 301. Eject the scanned document. The scanner unit 300 reads an image of a document on the contact glass 301 by the document reading unit 302.

  As shown in FIG. 2, the digital composite apparatus 1 includes a board such as a main controller board (not shown), an image processing controller board (image transmission side unit) 1000, and an LD board (image reception side unit) 1200. The image processing controller board 1000 is arranged near a main controller board (not shown) that controls each part of the digital multifunction peripheral 1, but the LD board 1200 is optically written as shown in FIG. In order to control the operation of the unit 230, it is disposed near the optical writing unit 230. The image processing controller board 1000 and the LD board 1200 are installed at positions distant from each other in the digital composite apparatus 1, and in order to transfer the image data at a high speed, the image processing controller board 1000 and the LD board 1200 communicate with the high-speed differential signal LVDS at high speed. Are connected by a SATA cable (high-speed transmission means) 1300 capable of high-speed transfer. The SATA cable 1300 has a length of about 3 m, and the degree of freedom in arrangement of the image processing controller board 1000 and the LD board 1200 is improved.

  Note that when the main / sub resolution on the LD board 1200 side and the main / sub resolution on the image processing controller board 1000 side are different, the digital multifunction device 1 is configured on the LD board 1200 side to reduce the transfer amount of image data. Perform data conversion. For example, when the main / sub scanning resolution in the optical writing unit 230 on the LD board 1200 side is 4800 dpi and the main / sub scanning resolution on the image processing controller board 1000 side is 1200 dpi, secondary image processing is performed on the LD board 1200 side. 4 times dense data conversion is performed. Also, the digital multi-function apparatus 1 sets the predetermined reference transfer line number m from the image processing controller board 1000 to the LD board 1200 as one scan period (image processing period), and sets the reference transfer line number m during the one scan period. Transfer of "m-1" lines (lines with the minimum number of processing lines), which is one line less than that, transfer of "m + 1" lines (lines with the maximum number of processing lines), which is one line greater than the reference transfer line number m, I do. For example, when the number of simultaneous writing lines (the number of light emitting elements) of the LD array 231 of the optical writing unit 230 is 40 lines and the conversion is performed four times densely on the LD board 1200 side, the reference transfer line number m is 10 lines. On the LD board 1200 side, 40 lines of 4800 dpi line image data are generated from 1200 dpi line image data for 10 lines. On the image processing controller board 1000 side, the write cycle of the LD array 231 is set to 1 line, 10 lines. The image writing process is performed in units of. The LD board 1200 side has a front / back scaling function for finely adjusting the front / back writing image data of the paper according to the shrinkage of the paper. That is, the digital multi-function apparatus 1 requests the image processing controller board 1000 side to transfer 11 lines, which is the maximum processing line, once every several scans from the LD board 1200 side, and the 11 lines on the LD board 1200 side. By generating 40 lines of 4800 dpi line image data from 1,200 dpi line image data, the front / back scaling process for fine reduction is performed, and transfer of 9 lines, which is the minimum processing line, is performed from the LD board 1200 side. By requesting the processing controller board 1000 side, the LD board 1200 side generates 40 lines of 4800 dpi line image data from 1200 dpi line image data for 9 lines, thereby performing front / back scaling processing for fine enlargement. .

  As shown in FIG. 2, the image processing controller board 1000 converts the RGB image data of the document read by the scanner unit 300 from C (cyan), M (magenta), Y (yellow), and K (black) image data. An image processing LSI (Large Scale Integrated circuit) (not shown) that performs image processing such as conversion processing, 256-value / quaternary (2-bit) conversion processing, error diffusion processing, and the like is mounted, and a serializer 1100 is mounted. The serializer 1100, which will be described in detail later, has serializers 1100C, 1100M, 1100Y, and 1100K (hereinafter referred to as the serializer 1100C as appropriate) for each color (CMYK color in this embodiment) that is a plate (channel). ~ 1100K)) and serializers 1100C ~ 1100K Is, (in the case of 1 pixel 2bit, are 4 pixels packing.) 8bit data is converted into 10bit, and serial converts the line image data of 10bit, and outputs to the LD board 1200 by LVDS differential signal.

  The LD board 1200 includes LD boards 1200C, 1200M, 1200Y, and 1200K (hereinafter referred to as LD boards 1200C to 1200K as appropriate) for the number of channels, that is, CMYK. The LD controllers 1210C, 1210M, 1210Y, and 1210K (hereinafter, appropriately referred to as LD controllers 1210C to 1210K) for each channel (each color) are mounted, and the LD arrays 231C, 231M, 231Y, and 231K (hereinafter, appropriately). , LD arrays 231C to 231K).

  As shown in FIG. 3, the LD board 1200 is disposed near the optical writing unit 230, and the LD boards 1200C to 1200K of each color (each channel) are modulated based on the image data of each color. LD arrays 231C to 231K for emitting a laser beam are mounted. 3 shows the LD board 1200C for cyan (C) and the optical writing unit 230C for cyan (C), the other colors (channels) have the same configuration.

  As shown for cyan (C) in FIG. 3, the optical writing unit 230 emits laser diodes 231C to 231K and collimating lenses 232C and 232M that emit laser beams modulated according to image data. 232Y, 232K (hereinafter, appropriately referred to as collimating lenses 232C to 232K), apertures 233C, 233M, 233Y, 233K (hereinafter, appropriately referred to as apertures 233C to 233K), cylindrical lenses 234C, 234M, 234Y, 234K (hereinafter, referred to as “aperture lenses”). As appropriate, the cylindrical lenses 234C to 234K), the polygon mirrors 235C, 235M, 235Y, 235K (hereinafter, appropriately referred to as the polygon mirrors 235C to 235K) and the polygon mirrors 235C to 235K are tilted. WTL (barrel toroidal lens: lens for tilting correction) 236C, 236M, 236Y, 236K (hereinafter referred to as WTL 236C-236K as appropriate), folding mirrors 237C, 237M, 237Y, 237K (hereinafter referred to as folding mirror 237C as appropriate) ~ 237K), dust-proof glass 238C, 238M, 238Y, 238K (hereinafter referred to as dust-proof glass 238C-238K as appropriate) and synchronization detection sensors 239C, 239M, 239Y, 239K (hereinafter referred to as synchronization detection sensors 239C-239K as appropriate). YMCK LD arrays 231C to 231K correspond to photoconductors 211C, 211M, 211Y, 211K (hereinafter referred to as 211C as appropriate) corresponding to laser bundles modulated based on the image data of each color. It is called ~ 211K. ). In the LD arrays 231C to 231K, a large number of light emitting elements are arranged in a row (array form) in the sub-scanning direction, and each light emitting element is lit and blinked under the control of the LD controllers 1210C to 1210K, and image data A laser beam modulated corresponding to is emitted. In the LD arrays 231C to 231K, for example, 40 light emitting elements are arranged in a row in the sub-scanning direction, and 40 lines are simultaneously optically written.

  The laser beams emitted from the LD arrays 231C to 231K pass through the collimating lenses 232C to 232K, the apertures 233C to 233K, and the cylindrical lenses 234C to 234K, are shaped into laser beams having a predetermined shape, and are formed on the polygon mirrors 235C to 235K. Irradiated. The polygon mirrors 235C to 235K continuously rotate at a predetermined high speed, reflect (deflect) the incident laser beam in the direction of the folding mirrors 237C to 237K, and are in the main scanning direction (the axial direction of the photoconductors 211C to 211K). ) Is repeatedly moved and scanned. The laser beams reflected by the polygon mirrors 235C to 235K are subjected to surface tilt correction by the WTLs 236C to 236K, then incident on the folding mirrors 237C to 237K, and the angles thereof are changed by the folding mirrors 237C to 237K. Images are formed in a spot shape with a predetermined beam diameter on the surfaces 211C to 211K.

  The laser beam reflected by the polygon mirror 235 and immediately before main scanning on the photoconductors 211C to 211K is main scan outside the main scanning writing area (outside a predetermined main scanning width) on the surface of the photoconductors 211C to 211K. The laser beam is incident on synchronization detection sensors 239C to 239K provided on the scanning of the laser beam on the starting point side, and the synchronization detection sensors 239C to 239K detect the incident laser beam, generate a synchronization detection signal, and generate an LD controller 1210C. Output to ~ 1210K.

  As described above, the serializer 1100 and the LD controller 1210 are provided with CMYK channels (colors), and the serializers 1100C to 1100K and the LD controllers 1210C to 1210K of each channel are cyan (C). As shown in FIG. Although FIG. 4 shows the serializer 1100C and the LD controller 1210C, the serializers 1100M to 1100K and LD controllers 1210M to 1210K of other colors (channels) have the same configuration. Therefore, in the description of FIG. 4 below, description will be made assuming that the serializers 1100C to 1100K and the LD controllers 1210C to 1210K are drawn.

  As shown in FIG. 4, serializers 1100C to 1100K mounted on the image processing controller board 1000 include line memories 1101C, 1101M, 1101Y, and 1101K (hereinafter referred to as line memories 1101C to 1101K as appropriate) and an image output control unit. 1102C, 1102M, 1102Y, 1102K (hereinafter, appropriately referred to as image output control units 1102C to 1102K), STP / END code adding units 1103C, 1103M, 1103Y, 1103K (hereinafter, appropriately, STP / END code adding units 1103C to 1103K) 8b / 10b converters 1104C, 1104M, 1104Y, 1104K (hereinafter referred to as 8b / 10b converters 1104C-1104K as appropriate), serial converters 1105C, 1105M, 1105Y. 1105K (hereinafter referred to as serial conversion units 1105C to 1105K as appropriate), LVDS I / O 1106C, 1106M, 1106Y, 1106K (hereinafter referred to as LVDS I / O 1106C to 1106K as appropriate) and the like. The mounted LD controllers 1210C to 1210K include LVDS I / O 1211C, 1211M, 1211Y, and 1211K (hereinafter referred to as LVDS I / O 1211C to 1211K as appropriate), parallel conversion units 1212C, 1212M, 1212Y, and 1212K (hereinafter referred to as parallel as appropriate). Converters 1212C to 1212K), 10b / 8b converters 1213C, 1213M, 1213Y, and 1213K (hereinafter, appropriately referred to as 10b / 8b converters 1213C to 1213K), STP · E. ND code interpretation units 1214C, 1214M, 1214Y, 1214K (hereinafter referred to as STP / END code interpretation units 1214C-1214K as appropriate), synchronization detection units 1215C, 1215M, 1215Y, 1215K (hereinafter referred to as synchronization detection units 1215C-1215K as appropriate) Image input control units 1216C, 1216M, 1216Y, 1216K (hereinafter referred to as image input control units 1216C-1216K as appropriate), line memories 1217C, 1217M, 1217Y, 1217K (hereinafter referred to as line memories 1217C-1217K as appropriate). Image processing units 1218C, 1218M, 1218Y, 1218K (hereinafter referred to as image processing units 1218C-1218K as appropriate) and PWM (Pulse Wide modulation) modulation units 1219C, 1219M, 1219Y. 1219K (hereinafter referred to as PWM modulation unit 1219C～1219K. ) Etc.

  The serializers 1100C to 1100K convert RGB image data read by the scanner unit 300 into CMYK image data by an image processing LSI on the image processing controller board 1000, and 256-value / 4-value (2 bit) conversion. Image data of 1 pixel and 2 bits subjected to image processing such as processing and error diffusion processing is input to the line memories 1101C to 1101K from an 8 bit × 75 MHz bus.

  The line memories (data storage means) 1101C to 1101K are, for example, a line memory in which one line is 8 bits × 2000 words (words), and at least two sets, i.e., 2m Line memory for one line and complementary line memories 1101Ch to 1101Kh for one line are provided. The serializers 1100C to 1100K toggle the line memories 1101C to 1101K for each group, and m lines input from the image processing LSI Image data is stored in each group of line memories 1101C to 1101K. When the line image data is accumulated in one set of line memories 1101C to 1101K, the serializers 1100C to 1100K receive the next-stage image output control units 1102C to 1102K from the line memories 1101C to 1101K in which the line image data is accumulated. The image data is sequentially output to the image data, and the next line image data from the image processing LSI is stored in another set of line memories 1101C to 1101K, and input and output of the line image data are performed in parallel with the toggle. The image output control units 1102C to 1102K store line image data in the line memories 1101C to 1101K that are targets to be output to the image output control units 1102C to 1102K among the two sets of line memories 1101C to 1101K. Complementary line image data is generated based on line image data of a predetermined line in the line memories 1101C to 1101K of the set (reference transfer unit), for example, line image data of all lines, and stored in the complementary line memories 1101Ch to 1101Kh. As described later, when a transfer error notification is sent from the LD controllers 1210C to 1210K, the complementary line image data in the complementary line memories 1101Ch to 1101Kh is read and output to the STP / END code adding units 1103C to 1103K. To do. In addition, when the output of the line memories 1101C to 1101K of the output target set is completed, the image output control units 1102C to 1102K may generate the corresponding sets and complement the complemented line memories 1101Ch to 1101Kh. When no transfer error notification is sent from the LD controllers 1210C to 1210K in the reference transfer unit, the line images of the next set of line memories 1101C to 1101K are output without outputting the complementary data of the complementary line memories 1101Ch to 1101Kh. The process of generating the complementary line image data for the data and complementing the complementary line memory 1101Ch to 1101Kh is repeatedly performed. In the above description, one line memory 1101C to 1101K is provided with one complementary line memory 1101Ch to 1101Kh, and the complementary line image data is complemented using the one complementary line memory 1101Ch to 1101Kh for each output target. However, complementary line memories 1101Ch to 1101Kh may be provided for each set of line memories 1101C to 1101K.

  Image output control units (data reading means, data generation means) 1102C to 1101K are sub-scanning transfer start signals (FSYNC) input from LD controllers 1210C to 1210K, which will be described later, and main scanning transfer start signals (data transfer start signals). LSYNC), the image data stored in the line memories 1101C to 1101K is read line by line, and transferred to the STP / END code adding units 1103C to 1103K in the subsequent stage. Further, as described above, the image output control units 1102C to 1102K generate complementary line image data for at least the line image data of the line memories 1101C to 1101K to be output based on the line image data of the line memories 1101C to 1101K. When the complementary line memories 1101Ch to 1101Kh are complemented and a transfer error notification is received from the LD controller 1210C to 1210K, the complementary line image data is read from the complementary line memories 1101Ch to 1101Kh at the end of the line image data of the set. It outputs to the code | symbol addition part 1103C-1103K. The image output control units 1102C to 1102K create complementary line image data, for example, by averaging all line image data of the set of line memories 1101C to 1101K. The image data is not limited to the line image data obtained by averaging the set of line image data, and may be line image data that appropriately reflects the image status of the set of line image data.

  STP / END code adding units (code adding means) 1103C to 1103K add a START symbol (four 8-bit symbols) to the head of the line image data received from the image output control units 1102C to 1101K as the head code. In addition, an END symbol (four symbols of 8 bits) is added to the rear end of the line image data as a rear end code, and is output to the 8b / 10b conversion units 1104C to 1104K. In this embodiment, the START symbol (first code) and the END symbol (rear code) are composed of four different types of symbols (codes), and a line to which the START symbol and the END symbol are added. When the LD controllers 1210C to 1210K, which are image data receiving partners, detect at least two of four START symbols and END symbols added to one line of image data (line image data). Assuming that the start position and end position of the line image data are detected, the line image data is processed to increase the error resistance of the START symbol and the END symbol. Although the number of symbols constituting the START symbol and the END symbol is four in the above description, it is not limited to four, and appropriate error resistance of the START symbol and the END symbol can be ensured. Any number may be used.

  The 8b / 10b converters 1104C to 1104K convert the 8-bit line image data to 10 bits and output the serial data to the serial converters 1105C to 1105K. The serial converters 1105C to 1105K serially convert the 10-bit line image data. , LVDS I / O 1106C to 1106K. The LVDS I / O 1106C to 1106K outputs serial line image data to the LVDS I / O 1211C to 1211K of the LD controllers 1210C to 1210K as a 750 MHz differential signal through the SATA cable 1300.

  The LD controllers 1210C to 1210K receive serial (1 bit × 750 MHZ) line image data transferred by the SATA cable 1300 by the LVDS I / O 1211C to 1211K, and the parallel conversion units 1212C to 1212K receive the 10 bit × 75 MHZ parallel data. Is converted to the line image data and passed to the 10b / 8b converters 1213C to 1213K.

  The LVDS I / O 1106C to 1106K, the SATA cable 1300, and the LVDS I / O 1211C to 1211K function as high-speed transmission means as a whole.

  The 10b / 8b converters 1213C to 1213K convert the 10-bit line image data into 8-bit line image data, and pass the converted data to the STP / END code interpreters 1214C to 1214K.

  The STP / END code interpretation units (code detection means) 1214C to 1214K interpret the START symbol added to the head of the 8-bit line image data and the END symbol added to the rear end of the line image data. The head and rear end of the main scan are detected. In the interpretation of the START symbol and the END symbol, as described above, if at least two START symbols can be interpreted, the head of the line image data can be detected, and if at least two END symbols can be interpreted, This means that the trailing edge of the line image data has been detected. The STP / END code interpretation units 1214C to 1214K pass the detection result of the START symbol and the END symbol and the image data to the image input control units 1216C to 1216K. A main scanning transfer start signal (LSYNC) is input from 1215K.

  The synchronization detection units 1215C to 1215K generate and issue a sub-scan transfer start signal (FSYNC) based on the sheet transfer start timing on the photoconductors 211C to 211K, and issue the image transfer start timing of one page as serializers 1100C to 1100K. Notify The synchronization detection units 1215C to 1215K also detect synchronization input from the synchronization detection sensors 239C to 239K based on the rotation speeds of the polygon mirrors 235C to 235K that control the irradiation of the photoconductors 211C to 211K of the LD arrays 231C to 231K. By generating and issuing a main scan transfer start signal (LSYNC) from the signal, the serializers 1100C to 1100K are notified of the image data transfer start timing of one line, and output to the image input control units 1216C to 1216K.

  The main scan transfer start signal (LSYNC) is periodically issued, and during the transfer of one page of image data, the serializers 1100C to 1100K transfer image data for one line during the main scan transfer start signal (LSYNC). If this is not possible, a timing error will occur and cause an abnormal image. Therefore, in the digital multifunction peripheral 1, the serializers 1100C to 1100K output one line of image data between the main scan transfer start signal (LSYNC) and the main scan transfer start signal (LSYNC), and the LD controllers 1210C to 1210K. Is designed to complete the imaging of one line of image data by the LD arrays 231C to 231K. The main scanning transfer start signal (LSYNC) issued from the synchronization detection units 1215C to 1215K is also notified to the image input control units 1216C to 1216K of the LD controllers 1210C to 1210K, and the image input control units 1216C to 1216K By receiving this main scanning transfer start signal (LSYNC), it is possible to grasp the transfer start timing of the next line. This main scan transfer start signal (LSYNC) is a data transfer start signal indicating the start of transfer of line image data for each line, and a transfer error notification for notifying that there is a transfer error in the line image data, as will be described later. The serializers 1100C to 1215K from the synchronization detectors 1215C to 1215K of the LD controllers 1210C to 1210K pass through the same signal lines as the signal (invalidity notification signal) and the signal unit processing start signal indicating the first line of the reference image processing unit (set). 1100k image output control units 1102C to 1102K.

  Image input control units (valid / invalid control means, image processing execution means) 1216C to 1216K are line image data, START symbol and END symbol detection results from the STP / END code interpretation units 1214C to 1214K, and synchronization detection units 1215C to 1215C. Based on the main scanning transfer start signal (LSYNC) from 1215K, it is determined whether the line image data has been normally received from the serializers 1100C to 1100K (determination of validity / invalidity of the line image data), and the received line image Control of writing data to the line memories 1217C to 1217K and output control of transfer error notification signals (invalidity notification signals) to the image output control units 1102C to 1102K of the serializers 1100C to 1100K via the synchronization detection units 1215C to 1215K I doThat is, when the image input control units 1216C to 1216K determine that the line image data transfer error is invalid, the image input control units 1216C to 1216K stop writing the invalid line image data to the line memories 1217C to 1217K, and a transfer error occurs. Only the valid line image data determined to be valid is written in the line memories 1217C to 1217K. Further, as will be described later, the image input control units 1216C to 1216K send a transfer error notification (invalid notification) to the serializers 1100C to 1100K, and the transfer error has occurred from the serializers 1100C to 1100K. When complementary line image data is transmitted as line image data of a line located next to line image data (invalid line image data) (hereinafter, referred to as next line image data as appropriate), the complementary line image data is Then, complementary image processing is performed in which error line image data (invalid line image data) is written to the line memories 1217C to 1217k to be written, and the next line image data is written to the line memories 1217C to 1217k.

  When the serializers 1100C to 1100K receive a transfer error notification from the image input control units 1216C to 1216K of the LD controllers 1210C to 1210K, the image output control units 1102C to 1102K add the line error data to the line image data in which the transfer error has occurred. Based on this, the complementary line image data generated in advance and supplemented to the complementary line memories 1101Ch to 1101Kh is transmitted to the LD controllers 1210C to 1210K. Note that the image output control units 1102C to 1102K of the serializers 1100C to 1100K perform the generation of the complementary line image data in advance, but may generate them when a transfer error notification is received from the LD controllers 1210C to 1210K.

  Further, when the image input control units 1216C to 1216K determine that a transfer error has occurred in one color of CMYK, as described above, the writing of the line image data of the error occurrence line to the line memories 1217C to 1217K is stopped. And canceling transfer error notification to the image output control units 1102C to 1102K of the serializers 1100C to 1100K, and transferring the complementary line image data transferred from the serializers 1100C to 1100K to the transfer error occurrence line and the next line In addition to performing complementary image processing to be written in the line memories 1217C to 1217K as image data, the position of the transfer error occurrence line is stored, for example, in an internal error history memory, and the error is also detected for other colors. Line position stored in history memory Discard the line image data, it may perform error handling processing regarded executes transfer error notification and complementary image processing. For example, when a transfer error occurs in cyan (C) line image data, the same line position as cyan (C) for magenta (M), yellow (Y), and black (K) is as follows. Even if no transfer error has occurred, it is assumed that a transfer error has occurred. Whether or not to perform error handling processing for other colors is also determined based on the color of the line image data in which the transfer error has occurred and whether or not to perform error handling processing for other colors. You may make it do. For example, as shown in FIG. 1, in the digital multifunction apparatus 1, the image formation order (processing order) in the printer unit 200 is the order of cyan (C), magenta (M), yellow (Y), and black (K). When a transfer error occurs in cyan (C) or magenta (M), there are a plurality of remaining color processes, and the error handling process is executed with regard to the remaining colors. Is generated in yellow (Y) or black (K), the remaining colors are small or absent, so that the error handling process may not be performed for the remaining colors. Further, when a transfer error occurs in line image data of one color, whether or not to perform error handling processing with regard to other colors is selected by operating the operation display unit of the digital composite apparatus 1 or the like It may be possible.

  In this embodiment, the line memories 1217C to 1217K (line memory means) are obtained by adding one line to the line number m of the reference transfer unit (reference image processing unit) from the line memory of 2 bits × 8000 words (word) ( m + 1) are set as one set, and two sets are provided, and the image input control units 1216C to 1216K write line image data by using the two sets of line memories 1217C to 1217K as toggles. Note that the line memories 1217C to 1217K have two lines (m + 1) as one set because the line image data of (m + 1) lines as the maximum number of processed lines from the serializers 1100C to 1100K at the time of front / back scaling processing. This is because the line image data of this (m + 1) number of lines can be stored in the line memories 1217C to 1217K. At this time, the image input control units 1216C to 1216K divide the 8-bit line image data (2-bit × 4-pixel packing) into 2 bits, and toggle one of the two sets of line memories 1217C to 1217K to one set of line memories 1217C to 1217K. Store with. That is, the line image data transferred in the reference transfer unit and written to the line memories 1217C to 1217K has a maximum processing line because the line image data in which the transfer error has occurred is discarded when a transfer error occurs. The (m + 1) number of lines is the maximum number of lines.

  The digital multifunction device 1 has a front / back magnification function as a processing function on the LD board 1200C to 1200K side. In order to realize this magnification function, according to a request from the LD board 1200C to 1200K side. When the reference transfer line number (reference processing line number) is “m”, the predetermined transfer line number is one scan period (reference image processing period), which is one line less than the reference transfer line number m. The transfer of the “m−1” line (the line with the minimum number of processing lines) and the transfer of the “m + 1” line (the line with the maximum number of processing lines), which is one more than the reference transfer line number m, are performed. For example, if the number of simultaneous writing lines (number of light emitting elements) of the LD array 231 of the optical writing unit 230 is 40 lines, the reference transfer line number m is 10 lines, and the LD board 1200 side has 10 lines worth. Forty lines of 4800 dpi line image data are generated from the 1200 dpi line image data. Therefore, on the image processing controller board 1000 side, image processing is performed in units of 10 lines, which is the number of simultaneous writing lines of the LD array 231. Furthermore, since the LD board 1200 performs fine adjustment of the image data written on the front and back sides of the paper according to the shrinkage of the paper by the front and back scaling process, the scaling in the sub-scanning direction is performed once every several scans. , 11 line transfer, 9 line transfer is requested to the image processing controller board 1000 side, and 4800 dpi line image data is generated for 40 lines from 1200 dpi line image data for 11 lines. By generating 40 lines of line image data of 4800 dpi from 1200 dpi for 9 lines, front / back scaling processing for fine enlargement is performed.

  When the digital multifunction apparatus 1 determines that a transfer error has occurred in the LD controllers 1210C to 1210K as the image receiving side units, the digital controller 1 sends a transfer error notification from the LD controllers 1210C to 1210K to the serializers 1100C to 1100K as the image transmitting side units. The image output control units 1102C to 1102K of the serializers 1100C to 1100K generate complementary line image data reflecting all the line image data of the group to which the error occurrence line belongs, and the generated complementary line image data is LD It transmits to the controllers 1210C-1210K.

  The digital composite apparatus 1 utilizes the fact that the main scanning transfer start signal (LSYNC) and the sub-scanning transfer start signal (FSYNC) are output from the synchronization detection units 1215C to 1215K to the image output control units 1102C to 1102K. By changing the signal content of the main scan transfer start signal (LSYNC), transfer errors are notified from the LD controllers 1210C to 1210K to the serializers 1100C to 1100K. That is, in the normal line image data request, the synchronization detection units 1215C to 1215K use, for example, a main scanning transfer start signal (LSYNC) that becomes three times low as shown in FIG. In the first scan line image data request for requesting the number (m + 1), as shown in FIG. 5B, a main scan transfer start signal (LSYNC) that becomes twice low is used to notify transfer error of the line image data. Sometimes, as shown in FIG. 5C, a main scanning transfer start signal (LSYNC) that goes low once is used.

  The image processing units 1218C to 1218K read line image data from the line memories 1217C to 1217K in which the line image data to be read of the processing target group is stored out of the two sets of line memories 1217C to 1217K, and perform PWM in the next stage. The data is output to conversion units 1219C to 1219K. Further, the image processing units 1218C to 1218K add one line to the reference transfer line number (for example, 10 lines in the above example) once every several scans in order to perform the front / back scaling process according to the shrinkage of the paper. When (m + 1) lines (11 lines in the above example) are transferred, line image data corresponding to the number m of reference transfer lines is generated from the line image data of the (m + 1) lines, and the PWM modulation section in the next stage Output to 1219C to 1219K.

  The PWM modulation units 1219C to 1219K generate LD drive signals that are PWM-modulated based on the image data input from the image processing units 1218C to 1218K, and PWM drive the LD arrays 231C to 231K.

  The optical writing units 230C to 230K form an electrostatic latent image on the photoconductors 211C to 211K by PWM driving the LD arrays 231C to 231K with an LD driving signal modulated based on image data, thereby forming an image. I do.

  The image input control units 1216C to 1216K function as valid / invalid determination means, and the image input control units 1216C to 1216K, line memories 1217C to 1217K, image processing units 1218C to 1218K, PWM modulation units 1219C to 1219K, and optical writing The units 230C to 230K function as image processing means as a whole.

  The digital composite apparatus 1 of this embodiment includes a ROM (Read Only Memory), an EEPROM (Electrically Erasable and Programmable Read Only Memory), an EPROM, a flash memory, a flexible disk, a CD-ROM (Compact Disc Read Only Memory), a CD. The image processing method of the present invention recorded on a computer-readable recording medium such as RW (Compact Disc Rewritable), DVD (Digital Video Disk), SD (Secure Digital) card, MO (Magneto-Optical Disc), etc. Image processing that appropriately improves the image quality of a transmission image when a transfer error occurs in high-speed transfer of image data, which will be described later, by loading an image processing program to be executed and introducing it into a ROM or hard disk of a main controller (not shown) Constructed as an image processing device (image forming device) for executing the method . This image processing program is a computer-executable program written in a legacy programming language such as assembler, C, C ++, C #, Java (registered trademark) or an object-oriented programming language, and is stored in the recording medium. Can be distributed.

  Next, the operation of this embodiment will be described. The digital composite apparatus 1 according to the present embodiment is provided between the serializers 1100C to 1100K on the image processing controller board 1000 and the LD controllers 1210C to 1210K of the LD boards 1200C to 1200K, which are arranged at separate positions and connected by the SATA cable 1300. Data quality of line image data in high-speed differential transfer is ensured appropriately.

  That is, the digital multi-function apparatus 1 sends image data obtained by reading an image of a document by the scanner unit 300 to the image processing controller board 1000, performs the above-described various image processing by the image processing LSI on the image processing controller board 1000, and performs 8-bit processing. Image data is sequentially stored in the line memories 1101C to 1101K in one of the two sets of serializers 1100C to 1100K. As shown in FIG. 6, the serializers 1100 </ b> C to 1100 </ b> K output images based on sub-scanning transfer start signals (FSYNC) and main-scanning transfer start signals (LSYNC) from the synchronization detection units 1215 </ b> C to 1215 </ b> K of the LD controllers 1210 </ b> C to 1210 </ b> K. The control units 1102C to 1102K sequentially read out the image data for each line from the other set of line memories 1101C to 1101K, transfer them to the subsequent STP / END code adding units 1103C to 1103K, and the STP / END code adding units 1103C to 1103C to 1103C. At 1103K, four types of START symbols are added to the head of the line image data, and four types of END symbols are added to the rear end of the line image data, and output to the 8b / 10b converters 1104C to 1104K. The sub-scan transfer start signal (FSYNC) is generated by the synchronization detectors 1215C to 1215K based on the transfer start timing (sheet transfer start timing of one page) of the photoconductors 211C to 211K, and the main scan transfer start signal ( LSYNC) is periodically performed by the synchronization detection units 1215C to 1215K based on the image data transfer start timing of one line from the rotation speed of the polygon mirrors 235C to 235K that controls the irradiation of the photoconductors 211C to 211K of the LD arrays 231C to 231K. Is generated.

  The serializers 1100C to 1100K convert the 8-bit line image data to 10 bits with the 8b / 10b conversion units 1104C to 1104K, serially convert the 10-bit line image data with the serial conversion units 1105C to 1105K, and the LVDS I / O 1106C LVDS transfer from ˜1106K to LVDS I / O 1211C to 1211K of LD controllers 1210C to 1210K through a SATA cable 1300 as a differential signal of 750 MHz.

  The LD controllers 1210C to 1210K of the LD board 1200 receive serial (1 bit × 750 MHZ) line image data transferred through the SATA cable 1300 with the LVDS I / O 1211C to 1211K, and the parallel conversion units 1212C to 1212K receive 10 bits. Converted to parallel line image data of x75 MHZ and passed to 10b / 8b converters 1213C to 1213K. The 10b / 8b conversion units 1213C to 1213K convert the 10-bit line image data into 8-bit line image data, and the STP / END code interpretation units 1214C to 1214K are added to the head of the 8-bit line image data. The START symbol and the END symbol added to the rear end thereof are interpreted, and the head and the rear end of the main scanning of the line image data of one line are detected. If the STP / END code interpretation units 1214C to 1214K can interpret at least two START symbols as described above in the interpretation of the START symbol and the END symbol, the head of the line image data can be detected. If the END symbols can be interpreted, the detection result of the START symbol and the END symbol and the line image data are passed to the image input control units 1216C to 1216K, assuming that the rear end of the line image data can be detected. The image input control units 1216C to 1216K are based on the main scan transfer start signal (LSYNC) from the synchronization detection units 1215C to 1215K and the line image data, START symbol, and END symbol detection results from the STP / END code interpretation units 1214C to 1214K. Then, it determines whether or not the line image data has been normally received from the serializers 1100C to 1100K (valid / invalid determination), controls the writing of the received image data to the line memories 1217C to 1217K, and also detects the synchronization detection unit 1215C. The transfer error notification signal is output to the image output control units 1102C to 1102K through ˜1215K. At this time, the image input control units 1216C to 1216K divide the 8-bit image data into 2 bits, and the number of lines (m + 1) obtained by adding one line to the reference transfer line number m is two sets. The data is sequentially stored in the memories 1217C to 1217K by toggle.

  When the image input control units 1216C to 1216K complete the storage of the line image data for one set (for the standard transfer unit) in the line memories 1217C to 1217K, the image input control units 1216C to 1216K A reference transfer unit storage completion signal indicating that the storage is completed is output to the image processing units 1218C to 1218K. When the reference transfer unit storage completion signal is input, the image processing units 1218C to 1218K receive the set of line image data of the set. The line image data (valid line image data) is read from the stored line memories 1217C to 1217K, subjected to necessary image processing, and then output to the PWM conversion units 1219C to 1219K. The PWM modulation units 1219C to 1219K Line image data input from the image processing units 1218C to 1218K Based on generates an LD drive signal PWM modulation, the LD array 231C~231K by PWM driving, forming an image on paper by the optical writing unit 230C～230K.

  When the serializers 1100C to 1100K receive a main scanning transfer start signal (LSYNC) indicating a transfer error notification signal from the synchronization detection units 1215C to 1215K, the image output control units 1102C to 1102K have already generated complementary line image data. Alternatively, the newly generated complementary line image data is read from the complementary line memories 1101Ch to 1101Kh of the line memories 1101C to 1101K and output to the STP / END code adding units 1103C to 1103K, and the STP / END code adding units 1103C to 1103K A START symbol and an END symbol are added to this complementary line image data, and serial high-speed transfer is performed to the LD controllers 1210C to 1210K as described above.

  That is, as shown in FIG. 7, when the main scanning transfer start signal (LSYNC) is input, the image output control units 1102 </ b> C to 1102 </ b> K have the number of assertions as shown in FIG. It is checked (step S101), and when the number of assertions is not one, it is checked whether the number of assertions as shown in FIG. 5B is two (step S102). If the number of assertions is two in step S102, the image output control units 1102C to 1102K indicate the main scan transfer start signal when the first line image data is requested for the main scan transfer start signal of one scan (reference transfer unit). It is determined that there is, and the complementary line memories 1101Ch to 1101Kh are cleared to generate complementary line image data for the reference transfer unit and stored in the complementary line memories 1101Ch to 1101Kh, or the complementary line memories 1101Ch to 1101Kh are cleared. Without generating the complementary line image data for the reference transfer unit and overwriting the complementary line memories 1101Ch to 1101Kh, and reading the first line image data for the reference transfer unit from the line memories 1101C to 1101K for serial high-speed transfer. Go (Step S 03), to check whether the end of the page (step S106). If it is not the end of the page in step S106, the image output control units 1102C to 1102K return to step S101, and check the number of assertions with respect to the next main scanning transfer start signal (steps S101 and S102). In step S102, as shown in FIG. 5A, when the number of assertions is not 2 (when 3), the image output control units 1102C to 1102K indicate that the main scan transfer start signal is a normal line image. It is determined that it is the main scanning transfer start signal at the time of the data transfer request, and normal line image data is transferred (step S104), and it is checked whether the page is finished (step S106).

  In step S101, if the number of assertions is 1, the image output control units 1102C to 1102K determine that the main scanning transfer start signal is a transfer error notification signal, and use the complementary line image data 1101Ch that has already been generated. Read from ~ 1101Kh, or generate complementary line image data and complement it to the complementary line memories 1101Ch to 1101Kh, then read from the complementary line memories 1101Ch to 1101Kh and transfer to the controllers 1210C to 1210K at high speed serial as described above (Step S105). In step S106, if it is the end of the page, the line image data transfer process is terminated.

  Then, the image output control units 1102C to 1102K transmit the complementary line image data for each set, that is, after transferring the last line image data of the reference transfer unit, the line image data next to the final line image data Send as.

  Note that the timing adjustment for making the complementary line image data the line following the last line of the reference transfer unit is not limited to the case where the image output control units 1102C to 1102K perform as described above. For example, the LD controller 1210C Image input control units 1216C to 1216K of ˜1210K may perform this.

  In this case, as shown in the flowchart of the transfer error notification and complementary line image data transfer process in FIG. 8, the digital multi-function apparatus 1 transfers line image data from the serializers 1100C to 1100K to the LD controllers 1210C to 1210K (steps). S201), the STP / END code interpretation units 1214C to 1214K detect the START symbol and the END symbol, and the image input control units 1216C to 1216K determine whether there is a transfer error in the line image data based on the detection result. (Step S202). If there is no transfer error in the line image data in step S202, the digital multi-function apparatus 1 ends the transfer of the line image data (step S203), and transfers the specified number of processing lines in the set (reference transfer unit). It is checked whether or not the transfer has been completed (step S205). If transfer of the designated processing line number has not been completed, the process returns to step S201 to perform the same processing as described above.

  If there is an error in the transfer of the line image data in step S202, the digital composite apparatus 1 causes the image input control units 1216C to 1216K to send a transfer error notification signal to the images of the serializers 1100C to 1100k via the synchronization detection units 1215C to 1215K. Output to the output control units 1102C to 1102K to notify a transfer error (step S204), end the transfer of the line image data (step S203), and check whether the transfer of the designated processing line number is completed (step S205). ).

  When the digital composite apparatus 1 completes the transfer of the designated number of processing lines in step S205, the image output control units 1102C to 1102K receive transfer error notifications from the image input control units 1216C to 1216K via the synchronization detection units 1215C to 1215K. Whether a transfer error has occurred is checked (step S206). If no transfer error has occurred, the process is terminated. When a transfer error has occurred in step S206, the digital composite apparatus 1 causes the image output control units 1102C to 1102K to read the complementary line image data from the complementary line memories 1101C to 1101K and transfer it to the LD controllers 1210C to 1210K. (Step S207).

  The LD controllers 1210C to 1210K receive the complementary line image data transmitted from the serializers 1100C to 1100K in the same manner as described above, and interpret the START symbol and the END symbol in the STP / END code interpretation units 1214C to 1214K. When the image input control units 1216C to 1216K determine that the supplemental line image data is valid from the interpretation result of the START symbol and the END symbol by the STP / END code interpretation units 1214C to 1214K, the supplementary line image data is discarded first. The invalid line image data is stored in the line memories 1217C to 1217K as line image data.

  The image input control units 1216C to 1216K determine that the line image data is invalid when the STP / END code interpretation units 1214C to 1214K cannot detect either the START symbol or the END symbol. That is, a transfer error occurs in the line image data that is transferred at high speed from the serializers 1100C to 1100K of the image processing controller board 1000 to the LD controllers 1210C to 1210K of the LD board 1200 through the SATA cable 1300 via the SATA cable 1300. As shown in the lower part of the enlarged main scanning transfer start signal (LSYNC) and LDVS transfer data shown in the upper part of FIG. 6, the timing Ta, which is the timing of the START symbol added to the head of the line image data for one line, The timing is one of timing Tb, which is any timing of the line image data, and timing Tc, which is the timing of the END symbol added to the rear end of the line image data. Among these transfer error occurrence timings Ta, Tb, and Tc, the error at the timing Tb of the line image data is only a loss of image data of 8 bits (2 bits × 4 pixels) due to one error, For example, in the case of A3 size 1200 dpi image data, there are 8000 pixels per line, and even if 4 pixels are missing, the line image data transfer error has an effect on the image quality for one line image. Can be ignored. Therefore, in the digital composite apparatus 1 of the present embodiment, only the transfer error at the timing Ta and the timing Tc is determined based on the detection results of the STP / END code interpretation units 1214C to 1214K for the START symbol and the END symbol, Processing for handling a transfer error.

  First, a case where a transfer error occurs at timing Tc will be described. When a transfer error occurs at timing Tc, one line of the END symbol is lost. Therefore, when line image data of the corresponding line is transferred from the serializers 1100C to 1100K to the LD controllers 1210C to 1210K, the receiving side LD controllers 1210C to 1210K The STP / END code interpretation units 1214C to 1214K cannot correctly detect the end of the line image data. That is, the image input control units 1216C to 1216K of the LD controllers 1210C to 1210K perform the START symbol processing on the line image data transferred from the STP / END code interpretation units 1214C to 1214K by using the STP / END code interpretation units 1214C to 1214K. Is detected, the head position of the line image data can be grasped, and the storage of the line image data in the line memories 1217C to 1217K can be started. However, when a transfer error occurs at the timing Tc, the STP / END code interpretation units 1214C to 1214K cannot detect the END symbol, and cannot normally detect the end of the line image data. Therefore, the image input control units 1216C to 1216K do not know the end position of the line image data, and continue the operation of writing the line image data to the line memories 1217C to 1217K after the end position of the line image data. If it continues, the line image data cannot be properly written to the line memories 1217C to 1217K, and appropriate image formation cannot be performed.

  Therefore, the digital multi-function apparatus 1 of the present embodiment also inputs the main scanning transfer start signal (LSYNC) output from the synchronization detection units 1215C to 1215K to the image input control units 1216C to 1216K, and the next main scanning transfer start signal ( When the main scanning transfer start signal (LSYNC) issues the synchronization detection units 1215C to 1215K at the output timing of (LSYNC), the image input control units 1216C to 1216K cause the main scanning transfer start signal (LSYNC) to It is understood that the transfer timing of line image data has come. When the main scanning transfer start signal (LSYNC) is input from the synchronization detection units 1215C to 1215K without the STP / END code interpretation units 1214C to 1214K detecting the END symbol, the image input control units 1216C to 1216K It is determined that the transfer of the line image data of the previous line is completed, the writing of the line image data of the previous line in which the END symbol is not detected to the line memories 1217C to 1217K is forcibly stopped, and the next line image data Move on to processing.

  Then, the image processing units 1218C to 1218K do not detect the END symbol in this way, and the line image data of the line memories 1217C to 1217K that have been written by the input of the next main scanning transfer start signal (LSYNC). Are read from the line memories 1217C to 1217K by the required data amount, that is, the data amount of one line, and output to the PWM modulation units 1219C to 1219K. As described above, the image processing units 1218C to 1218K read the line image data from the line memories 1217C to 1217K by the amount of data of one line, so that appropriate image formation can be performed.

  Next, a case where a transfer error occurs at timing Ta will be described. When a transfer error occurs at timing Ta, the START symbol of the LD controller 1210C to 1210K is lost even if the data transfer of the line image data starts because the START symbol of one line of line image data is lost. The heads of the line image data cannot be detected correctly, and the image input control units 1216C to 1216K do not write the line image data to the line memories 1217C to 1217K, and the STP / END code interpretation units 1214C to 1214K Will wait for a notification that the START symbol at the head of the line has been detected. When the image input control units 1216C to 1216K are in this waiting state and the transfer cycle of one line has passed and the main scanning transfer start signal (LSYNC) for the next line is input from the synchronization detection units 1215C to 1215K, It is determined that all the line image data cannot be written to the line memories 1217C to 1217K, and invalid line image data for one line has been generated, and the line image data is appropriately written to the line memories 1217C to 1217K. The transfer error notification signal indicating that the transfer error notification signal has been lost cannot be transmitted to the image output control units 1102C to 1102K of the serializers 1100C to 1100k through the synchronization detection units 1215C to 1215K. When the transfer error notification signal is input from the image input control units 1216C to 1216K, the image output control units 1102C to 1102K output the complementary line image data next to the line image data of the line located at the end of the reference transfer unit to the LD controller. Transfer to 1210C-1210K.

  Then, as described above, in order to realize the front / back scaling function, the digital multifunction apparatus 1 sets the number of lines in the reference transfer unit (hereinafter referred to as the reference transfer line number as appropriate) to “m”. With a predetermined number of transfer lines as one scan line period (image processing period), transfer of “m−1” lines (lines with the minimum number of process lines), which is one line less than the reference transfer line number m, and reference transfer lines The line image data is transferred with the number of “m + 1” lines (the number of the maximum number of processing lines) that is one line greater than the number m being designated as the number of processing lines. For example, if the number of simultaneous writing lines (number of light emitting elements) of the LD array 231 of the optical writing unit 230 is 40 lines, the reference transfer line number m is 10 lines, and the LD board 1200 side has 10 lines worth. Forty lines of 4800 dpi line image data are generated from the 1200 dpi line image data. Therefore, on the image processing controller board 1000 side, image processing is performed in units of 10 lines as a set, with the write start cycle of the LD array 231 being one line. Furthermore, since the LD board 1200 performs fine adjustment of the image data written on the front and back sides of the paper according to the shrinkage of the paper by the front and back scaling process, the scaling in the sub-scanning direction is performed once every several scans. , 11 line transfer, 9 line transfer is requested to the image processing controller board 1000 side, and 4800 dpi line image data is generated for 40 lines from 1200 dpi line image data for 11 lines. By generating 40 lines of line image data of 4800 dpi from 1200 dpi for 9 lines, front / back scaling processing for fine enlargement is performed.

  The image input control units 1216C to 1216K determine whether the current scan is a scan with the maximum number of transfer lines (m + 1) or the maximum number of transfer lines (m + 1) with respect to the maximum number of transfer lines (m + 1). ) To determine whether the number of transfer lines is less than m or the number of transfer lines (m-1) from the front / back magnification, and when a transfer error occurs, the transfer error is sent from the serializers 1100C to 1100K. In order to perform image processing by writing to the line memories 1217C to 1217K in order to complement invalid line image data in which writing to the line memories 1217C to 1217K is stopped by invalidating the line in which the transfer error has occurred in the coming complementary line image data, The signal width of the memory toggle signal is one signal of the main scan transfer start signal (LSYNC). That is, by performing the expansion process of increasing one line performs image processing. That is, as shown in FIG. 9, the transfer line in the reference transfer cycle is the maximum transfer line (m + 1), for example, 11 lines, and if a transfer error occurs during this 11-line transfer, The image input control units 1216C to 1216K send a transfer error notification signal to the image output control units 1102C to 1102K of the serializers 1100C to 1100k, and send a memory toggle signal to one main scanning transfer start signal as shown in FIG. When the complement line image data is transmitted from the serializers 1100C to 1100K on the 12th line, the invalid line image data generated due to the transfer error is to be stored in the line memories 1217C to 1217k. Write the complementary line image data to the line memory, and then To perform image processing in the processing unit of the image processing unit 1218C~1218K later.

  The image input control units 1216C to 1216K then specify that the number of designated processing lines in the next reference transfer unit in which the transfer error has been eliminated is less than the maximum transfer line number (m + 1) (m, m−1). As shown in FIG. 9B, the expanded memory toggle signal is reduced by one line.

  That is, as shown in FIG. 10, the image input control units 1216C to 1216K check whether the designated processing line number is 11 lines which is the maximum transfer line number (step S301). It is checked whether an error has occurred (step S302). When a transfer error occurs in step S302, the image input control units 1216C to 1216K extend the toggle cycle by one main scan transfer start signal (LSYNC) as shown in FIG. 9A. Then, the 11-line transfer error flag is turned on (step S303), and the memory toggle signal expansion / contraction process is terminated. If no transfer error has occurred in step S302, the image input control units 1216C to 1216K end the memory toggle signal expansion / contraction process without expanding the memory toggle signal.

  In step S301, if the designated processing line number is the maximum transfer line number, the image input control units 1216C to 1216K indicate that the 11 line transfer error flag is ON and a transfer error occurs in the transfer of the current line image data. Is checked (step S304). If both conditions are satisfied (YES) in step S304, the image input control units 1216C to 1216K perform toggle cycle reduction processing for reducing the extended toggle signal by one line, resulting in an 11-line transfer error. The flag is turned off (step S305), and the memory toggle signal expansion / contraction process is terminated. In step S304, when one or both of the conditions are not satisfied, that is, at least one of the condition that the 11-line transfer error flag is ON and the transfer error has not occurred. When the condition is not satisfied, the image input control units 1216C to 1216K end the memory toggle signal enlargement / reduction processing without performing the toggle reduction processing and the 11-line transfer flag OFF setting.

  As described above, the digital composite apparatus 1 according to the present embodiment performs high-speed transfer of line image data from the serializers 1100C to 1100k to the LD controllers 1210C to 1210K through the SATA cable 1300, and performs image formation as image processing with the LD controllers 1210C to 1210K. In this case, the serializers 1100C to 1100k add a START symbol (head code) and an END symbol (rear end code) to the head and rear ends of the line image data, and transmit them to the LD controllers 1210C to 1210K. Then, the validity / invalidity of the line image data is determined based on the START symbol and the END symbol. For the effective line image data, the image processing is executed with the number of reference processing lines as a reference image processing unit, If it is determined that that sends a forward error notification signal to the serializer 1100C～1100k. The serializers 1100C to 1100k generate complementary line image data based on the line image data of a predetermined number of lines in the reference image processing unit to which the line image data for which the transfer error is notified belong, and transfer the complementary line image data to the LD controllers 1210C to 1210K. Then, the LD controllers 1210C to 1210K perform image processing by performing data complement processing that uses the complemented line image data as discarded line image data.

  Therefore, an abnormality occurs in the high-speed transfer of the line image data from the serializers 1100C to 1100K of the image processing controller board 1000 arranged at a distant position in the digital composite apparatus 1 to the LD controllers 1210C to 1210K of the LD boards 1200C to 1200K. Even if invalid line image data that cannot be properly transmitted is generated, complementary line image data is generated by the serializers 1100C to 1100K, transferred to the LD controllers 1210C to 1210K, and the LD board 1200C to 1200K side performs the complementing. Line image data can be subjected to image processing as the invalid line image data, and appropriate image processing can be performed.

  Also, in the digital multifunction peripheral 1 of this embodiment, the image output control units 1102C to 1102K of the serializers 1100C to 1100k are based on all the line image data of the reference image processing unit to which the line image data for which the transfer error notification has been made belongs. Complementary line image data is generated.

  Therefore, it is possible to generate complementary line image data reflecting an image of the reference image processing unit and complement it as invalid line image data, thereby improving the image quality.

  Further, in the digital multifunction peripheral 1 of this embodiment, the image input control units 1216C to 1216K perform main scanning transfer from the synchronization detection units 1215C to 1215K to the image output control units 1102C to 1102K of the serializers 1100C to 1100k for each line image data. A data transfer start signal which is a start signal (LSYNC) is transmitted, and the image output control units 1102C to 1102K receive line image data for each line from the line memories 1101C to 1101K based on the main scan transfer start signal (LSYNC). Reading and transferring.

  Therefore, it is possible to transfer the line image data and process the complementary line image data based on the main scanning transfer start signal (LSYNC), and to perform the image processing easily and appropriately.

  Further, in the digital composite apparatus 1 of this embodiment, the image input control units 1216C to 1216K have a reference image processing unit between a maximum processing line number that is larger than the reference processing line number and a minimum processing line number that is smaller than the predetermined processing line number. While processing the line image data of a certain number of lines, the main scanning transfer start signal (LSYNC), which is a unit processing start signal when processing the first line image data of the reference image processing unit, is output from the serializers 1100C to 1100k. The reference image processing units stored in the line memories 1101C to 1101K are sent to the output control units 1102C to 1102K and the image output control units 1102C to 1102K each receive a main scanning transfer start signal (LSYNC). Generate complementary line image data from the line image data belonging to When the transfer error notification signal (disable notification signal) is sent, and transfers the complementary line image data to the LD controller 1210C～1210K.

  Therefore, it is possible to appropriately generate and transfer complementary line image data when performing image processing for each of a plurality of lines in the reference image processing unit and performing front / back scaling processing.

  Further, in the digital composite apparatus 1 of the present embodiment, the image input control units 1216C to 1216K receive the transfer error signal that is a transfer error notification signal and the first line image data request signal in one scan that is a unit processing start signal. This signal is transmitted using the same signal line as the main scanning transfer start signal (LSYNC), and the signal form of the main scanning transfer start signal (LSYNC) is changed as the transfer error notification signal and the unit processing start signal. Signals with different number of assertions are used.

  Therefore, it is possible to appropriately perform image transfer while performing error processing and front / back scaling processing with a simple configuration.

  Further, in the digital multi-function apparatus 1 according to the present embodiment, the number of lines processed by the image input control units 1216C to 1216K within the reference image processing unit is the maximum number of reference processing lines and a maximum number of processing that is greater than the reference processing line number. The number of lines or the number of lines between the minimum number of processing lines that is a predetermined number of lines less than the number of reference processing lines is set as the number of specified processing lines, and the processing of the line image data of the specified number of processing lines is executed, and data transfer is performed for each processing line A main scanning transfer start signal (LSYNC) that is a start signal is output, and a main scanning transfer start signal (LSYNC) that is a unit processing start signal is output when processing of the first line image data of the reference image processing unit is started, If the specified number of processing lines in the reference image processing unit in which invalid line image data is generated is the maximum number of processing lines, the maximum processing The complementary line image data can be processed with the number of lines increased by one in the number of INs as the designated processing line number in the reference image processing unit, and then in the reference image processing unit in which invalid line image data did not occur. The designated processing line is reduced by one line.

  Therefore, it is possible to appropriately perform the invalid line image data complementing process using the complement line image data by effectively utilizing the micro scaling function.

  The invention made by the present inventor has been specifically described based on the preferred embodiments. However, the present invention is not limited to that described in the above embodiments, and various modifications can be made without departing from the scope of the invention. It goes without saying that it is possible.

  The present invention relates to an image processing apparatus and an image processing method such as a copying apparatus, a facsimile apparatus, and a composite apparatus that perform image processing such as image formation by transferring image data from an image transmitting side to an image receiving side by high-speed differential transfer. It can be used for an image processing program and a recording medium.

1 is a schematic front view of a digital composite apparatus to which an embodiment of the present invention is applied. FIG. 2 is a block diagram of a main part of the digital composite apparatus in FIG. 1. FIG. 2 is a perspective view of a principal block configuration and an optical writing unit of the digital composite apparatus of FIG. 1. The block diagram of a serializer and LD controller. Explanatory drawing of the main scanning transfer start signal including the transfer error notification of line image data. The figure which shows the transfer timing of image data. 5 is a flowchart showing an operation control process based on a main scanning transfer start signal by an image output control unit. 6 is a flowchart showing a transfer error notification / complementary line image data transfer process. The timing diagram of each signal at the time of enlarging / reducing a memory toggle signal. The flowchart which shows the expansion / contraction process of a memory toggle signal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Digital compound apparatus 100 Paper feed part 200 Printer part 211C, 211M, 211Y, 211K Photoconductor 230 Optical writing part 231C, 231M, 231Y, 231K LD array 300 Scanner part 1000 Image processing controller board 1100C, 1100M, 1100Y, 1100K Serializer 1101C 1101M 1101Y 1101K Line memory 1102C 1102M 1102Y 1102K Image output control unit 1103C 1103M 1103Y 1103K STP / END code addition unit 1104C 1104M 1104Y 1104K 8b / 10b conversion unit 1105C 1105M 1105Y 1105K serial conversion unit 1106C, 1106M, 1106Y, 1106K LVDS I / O
1200 LD board 1210C, 1210M, 1210Y, 1210K LD controller 1211C, 1211M, 1211Y, 1211K LVDS I / O
1212C, 1212M, 1212Y, 1212K Parallel conversion unit 1213C, 1213M, 1213Y, 1213K 10b / 8b conversion unit 1214C, 1214M, 1214Y, 1214K STP / END code interpretation unit 1215C, 1215M, 1215Y, 1215K Synchronization detection unit 1216C, 1216M , 1216K Image input control unit 1217C, 1217M, 1217Y, 1217K Line memory 1218C, 1218M, 1218Y, 1218K Image processing unit 1219C, 1219M, 1219Y, 1219K PWM modulation unit

Claims (13)

  In an image processing apparatus in which an image transmission side unit and an image reception side unit are connected by high-speed transmission means, the image transmission side unit stores data for a predetermined line in which image data is written in units of lines. A data reading means for reading out image data from the data storage means for each line at a predetermined reading timing; and line image data of a predetermined number of lines read by the data reading means or controlled by the data reading means Data generation means for generating complementary line image data from the data, line image data read by the data reading means, and a head code and a rear end code are assigned to the beginning and the rear end of the complementary line image data generated by the data generation means, respectively. And a code providing means for passing to the high-speed transmission means, The image receiving side unit includes code detection means for detecting the head code and the rear end code from line image data transmitted through the high-speed transmission means, and the line image data based on the detection result of the code detection means. The valid line image data is determined, and for the valid line image data, predetermined image processing is executed with a predetermined number of reference processing lines as a reference image processing unit. For invalid line image data, the line image data is discarded and discarded. Image processing execution means for transmitting an invalidity notification signal indicating invalidity to the image transmission side unit, and when the invalidity notification signal is sent to the image transmission side unit, the data generation means, The complementary line image data is generated based on a predetermined number of line image data within the reference image processing unit to which the invalid notified line image data belongs. , The image receiving side unit, the image processing apparatus to which the image processing execution unit, characterized in that the complementary line image data to perform the image processing performed data interpolation processing to the line image data the destroyed.   2. The image according to claim 1, wherein the data generation unit generates the complementary line image data based on all line image data of the reference image processing unit to which the line image data notified of the invalidity belongs. Processing equipment.   The image processing execution means transmits a data transfer start signal to the image transmission side unit for each line image data, and the data reading means is sent from the data storage means for each line based on the data transfer start signal. 3. The image processing apparatus according to claim 1, wherein line image data is read out.   The image processing execution means performs processing on line image data having a number of lines between a maximum number of processing lines that is greater by a predetermined number of lines than the number of reference processing lines and a minimum number of processing lines that is less than the predetermined number of lines in the reference image processing unit. In addition, a unit processing start signal is transmitted to the image transmission side unit when processing the first line image data of the reference image processing unit, and the data generation unit is configured to transmit the unit processing start signal each time the unit processing start signal is transmitted. The complementary line image data is generated from the line image data belonging to the reference image processing unit stored in the data storage means, and when the invalidity notification signal is sent, the complementary line image data is sent to the sign providing means. The image processing apparatus according to claim 2, wherein the image processing apparatus outputs the image.   The image processing execution means transmits the invalidity notification signal and the unit processing start signal using the same signal line as the data transfer start signal, and uses the data transfer as the invalidity notification signal and the unit processing start signal. The image processing apparatus according to claim 4, wherein a signal obtained by changing a signal form of the start signal is used.   The image processing execution means is configured to set the number of lines to be processed in the reference image processing unit as the number of reference processing lines, the maximum number of processing lines greater than the number of reference processing lines, or a predetermined number of lines greater than the number of reference processing lines. The line image data of the designated number of processing lines is processed with the number of lines between the minimum number of processing lines as the designated number of processing lines, the data transfer start signal is output for each processing line, and the reference image processing When the processing of the first line image data of the unit is started, the unit processing start signal is output, and when the designated processing line number of the reference image processing unit in which the invalid line image data is generated is the maximum processing line number, The number of lines increased by one line to the number is designated as the number of processing lines in the reference image processing unit, and the complementary line image data is processed. Enabling and was, then the invalid line image data the image processing apparatus according to claim 4 or claim 5, wherein the specified processing line in the reference image processing unit, characterized in that reducing one line has not occurred.   An image processing method executed by an image processing apparatus in which an image transmission side unit and an image reception side unit are connected by high-speed transmission means, and image data is written in line units as processing steps in the image transmission side unit A data read processing step for reading image data line by line at a predetermined read timing from data storage means for storing image data for a predetermined line, and controlling or controlling the line image data read in the data read processing step A data generation processing step for generating complementary line image data from line image data of a predetermined number of lines read in the data reading processing step, line image data read in the data reading processing step, and the data generation processing step. Start and end of the generated supplemental line image data A code addition processing step for giving a head code and a rear end code to be passed to the high-speed transmission means, respectively, and as a processing step of the image receiving side unit, from line image data transmitted through the high-speed transmission means A code detection processing step for detecting the head code and the rear end code, and the validity / invalidity of the line image data is determined based on the detection result in the code detection processing step. Predetermined image processing is executed using the number of reference processing lines as a reference image processing unit, and invalid line image data is discarded and an invalidity notification signal indicating that the line image data is invalid is transmitted to the image transmission side unit. An image processing execution processing step, and the data generation processing step receives the invalidity notification signal when the invalidity notification signal is sent. The complementary line image data is generated based on a predetermined number of line image data within the reference image processing unit to which the line image data belongs, and the image processing execution processing step discards the complementary line image data. An image processing method, wherein the image processing is executed by performing a data complementing process for line image data.   The said data generation process step produces | generates the said complementary line image data based on all the line image data of the said reference image processing unit to which the line image data with which the said invalid notification was carried out. Image processing method.   The image processing execution processing step transmits a data transfer start signal to the image transmission side unit for each line image data, and the data read processing step performs a line transfer from the data storage means based on the data transfer start signal. 9. The image processing method according to claim 7, wherein line image data is read every time.   The image processing execution processing step processes line image data having a number of lines between a maximum number of processing lines larger than the reference processing line number and a minimum processing line number smaller than the reference processing line number in the reference image processing unit. And a unit processing start signal is transmitted to the image transmission side unit when processing the first line image data of the reference image processing unit, and the data generation processing step is performed each time the unit processing start signal is sent. Generating the complementary line image data from the line image data belonging to the reference image processing unit stored in the data storage means, and adding the complementary line image data when the invalidity notification signal is sent The image processing method according to claim 8, wherein the image processing method outputs to a processing step.   In the image processing execution processing step, as the number of lines to be processed in the reference image processing unit, the number of reference processing lines, the maximum number of processing lines larger by a predetermined number than the number of reference processing lines, or a predetermined number more than the number of reference processing lines The number of lines between the minimum number of processing lines is set to the number of designated processing lines, the line image data of the designated number of processing lines is executed, the data transfer start signal is output for each processing line, and the reference image When the processing of the first line image data of the processing unit is started, the unit processing start signal is output. The number of lines increased by one line to the number of lines is set as the number of designated processing lines in the reference image processing unit, and the complementary line image data is displayed. To allow the processing of data, then image processing method according to claim 10, wherein the reducing one line specified processing line in the reference image processing unit not occur in the invalid line image data.   An image processing program installed in an image processing apparatus in which an image transmission side unit and an image reception side unit are connected by high-speed transmission means, and image data is processed in units of lines in the computer as processing in the image transmission side unit A data read process for reading image data line by line from a data storage means for storing image data for a predetermined line written at a predetermined read timing, and controlling line image data read by the data read process or Data generation process for generating complementary line image data from line image data of a predetermined number of lines read in the data read process, line image data read in the data read process, and complement generated in the data generation process A head code and rear end code are assigned to the head and rear end of line image data, respectively. A code for detecting the leading code and the trailing code from line image data transmitted through the high-speed transmission means as processing of the image receiving unit. Validity / invalidity of the line image data is determined based on the detection process and the detection result in the code detection process. For the effective line image data, a predetermined image with a predetermined reference processing line number as a reference image processing unit And executing the image processing execution processing for discarding the invalid line image data and transmitting the invalidity notification signal indicating that the line image data is invalid to the image transmission side unit. When the invalidity notification signal is sent, a line image having a predetermined number of lines in the reference image processing unit to which the line image data for which the invalidity notification has been sent belongs. Generating the complementary line image data based on data, and performing the image processing by performing a data complementing process using the complementary line image data as the discarded line image data in the image processing execution process. Image processing program.   A computer-readable recording medium on which the image processing program according to claim 12 is recorded.

Images