JP5293028B2 - Image forming apparatus, image forming control method, image forming control program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image formation device, an image formation control method, an image formation control program, and a recording medium for line image formation diverting a system of a page image formation device. <P>SOLUTION: In a complex device 1, a skip control unit 23 reads image data of a skip memory 22, at the same time, detects white of the image data, discards white pixels when there are continuous white pixels, counts the number of the continuous white pixels, outputs a skip notification when the number of the continuous white pixels corresponds to two bands, stops main scanning movement of a head part 4, and carries out a skipping operation of conveying only paper for the length corresponding to the two bands. When the complex device 1 detects an effective pixel after the continuous white pixels in the image data read from the skip memory 22, the reading of the image data from the skip memory 22 is temporarily stopped, the image data of the discarded white pixels from the top pixel to the effective pixel of the next line of the skip notification line is generated from the number of continuous white pixels, and the data is transmitted to a head-side image processing unit 16. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an image forming apparatus, an image forming control method, an image forming control program, and a recording medium. Specifically, when there is continuous blank dot image data, until there is next non-blank image data. The present invention relates to an image forming apparatus, an image forming control method, an image forming control program, and a recording medium that improve the printing speed by changing the image forming process.

  2. Description of the Related Art Conventionally, in image forming apparatuses such as printers, copiers, facsimile machines, and composite apparatuses, a page image forming apparatus such as a laser printer that performs image forming processing in units of pages and an ink jet printer that performs image forming processing in units of lines. Line image forming apparatus. In a page image forming apparatus, a system controller that performs image processing receives image data from an image processing unit that processes read image data obtained by reading a document by a scanner unit or received image data received from an external computer, and stores one page in a memory. When the image data is accumulated, the necessary image processing is performed, and then the image data is transferred to the engine controller that controls image formation. When the engine controller receives the image data for one page, the necessary image processing is performed. The image data for one page is output at an appropriate timing to an image forming engine that actually forms an image and forms an image on a page basis.

  In the line image forming apparatus, when the system controller receives image data from an image processing unit that processes read image data and received image data and accumulates a predetermined amount of image data in a memory, the image controller performs necessary image processing, and then performs image processing. The image data is transferred to the engine controller that controls the formation, and the engine controller outputs the received image data to the image forming engine at appropriate timing in band units (line units or multiple line units) to form images in band units. Let

  Since the line image forming apparatus can form a seamless long size image as long as the image forming medium such as paper or cloth continues, image formation of a large size or a long size such as a banner or a banner is possible. An image is formed on a medium. The line image forming apparatus is desired to form a high-quality image at a higher speed in forming an image on such a large or long image forming medium, particularly on a long image forming medium. However, since the image data becomes a large size according to the line size, when printing on a wide and long image forming medium having a large line size, the processing time of the image data becomes longer as the line size becomes larger. . However, the conventional line image forming apparatus always sends data from the system controller to the engine controller at a constant speed regardless of the image data pattern for image formation on the image forming medium. However, since the image forming medium is always transported at a constant speed, the image forming speed is low, and it is desired to increase the image forming speed.

  Therefore, conventionally, when printing is performed while reciprocating the print head in the main scanning direction for each pixel based on the image data, if there is image data of continuous blank dots of one line or more, the image other than the blank is next. A technique has been proposed in which the reciprocation of the print head is stopped until data exists, and so-called skip processing, in which paper is conveyed for blank lines, is performed to increase the image forming speed (Patent Document 1). , See Patent Document 2).

Japanese Patent Publication No. 6-36546 No. 2000-127510

  However, since the above-described conventional technology is premised on an image forming apparatus in which hardware and software have been developed exclusively as a line image forming apparatus, it lacks versatility, and hardware dedicated to the line image forming apparatus. Developing software increases development costs. That is, today, not only the line image forming apparatus but also the page image forming apparatus is widely used in the image forming apparatus, and the development cost is to divert the hardware and software of the page image forming apparatus to the line image forming apparatus. This is important in reducing the generality and improving versatility. Accordingly, the system controller of the page image forming apparatus is applied to the line image forming apparatus, connected to the engine controller of the line image forming apparatus, and read by the image reading unit and subjected to necessary image processing (hereinafter referred to as image data). If necessary, it is referred to as scanner image data) and image data that has been received and subjected to necessary image processing (hereinafter referred to as received image data if necessary) is temporarily stored in the memory of the system controller. After performing the necessary image processing, it is sent to the engine controller. After the necessary image processing is performed by the engine controller, image data is sent to the engine, and the engine forms an image on the image forming medium line by line based on the image data. Then, when transferring image data from the system controller memory of the applied page image forming apparatus to the engine controller memory of the line image forming apparatus, if there is a free space in the engine controller memory, the image data is transferred from the system controller memory to the engine. It is necessary to transfer to the controller memory.

  However, when hardware of a page image forming apparatus, in particular, when a system controller is applied to a line image forming apparatus, the system controller usually only has a memory for several lines as a memory for image data. Therefore, when applied to a line image forming apparatus that forms an image on a long image forming medium, scanner image data and received image data are continuously input as long as the image forming medium continues. The data is temporarily stored in a large-capacity memory such as a hard disk and sequentially transferred to the memory of the system controller. The system controller performs processing to transfer the image data in the memory in response to a transfer request from the engine controller. .

  In the line image forming apparatus, skip processing is performed in order to improve the image forming speed, in particular, in order to improve the image forming speed when forming an image on a wide image forming medium. However, since the page image forming apparatus forms an image on a page basis and does not perform skip processing as described above, the system controller of the page image forming apparatus has a skip processing function as hardware and software. Not. Therefore, in order to perform the skip process in the line image forming apparatus to which the system controller of the page image forming apparatus is applied, the engine controller performs the skip process at the stage of processing the image data transferred from the system controller, and the engine controller It is necessary to control.

  In addition, when skip processing is performed on image data transferred from the system controller by the engine controller, the line image data transferred from the system controller and stored in the memory of the engine controller is used for lines with continuous blank data. If processing that discards and does not generate image data is performed, the processing speed can be improved. In this case, it is necessary to transfer the image data from the memory of the system controller to the memory of the engine controller at high speed in accordance with the image data to be discarded.

  However, as described above, when image data is transferred from a large-capacity memory such as a hard disk to the system controller memory and the image data transferred to the memory is transferred in response to a transfer request from the engine controller, the engine controller There is a possibility that the image data transfer request from will precede the image data transfer to the memory of the system controller. When such a situation occurs, the next image data is not written from the large-capacity memory to the system controller memory, and in response to a transfer request of the image data from the engine controller, the memory from the system controller to the engine controller memory. Therefore, there is a possibility that an abnormal situation such as an abnormal image occurs due to transfer of defective image data from the system controller to the engine controller.

  In this case, for example, a skip memory for several bands is installed on the engine controller side so that image data transfer requests from the engine controller to the system controller and white detection for skip processing are performed independently. This can be dealt with by controlling, but in this case, in the case of an image forming apparatus that reads a wide document, a large-capacity memory is required, and there is a problem that the cost is high.

  Therefore, the present invention is an image forming apparatus, an image forming control method, an image forming control program, and a recording that perform line image forming processing at high speed and at low cost by appropriately performing skip processing by applying the system controller of the page image forming apparatus. The purpose is to provide a medium.

  In order to achieve the above object, the present invention reads the image data in the image data storage means for storing the image data, and simultaneously performs white detection for each pixel to determine whether or not the image data is a white pixel. When white pixels continue, the white pixels are discarded and the number of continuous white pixels is counted, and when the number of continuous white pixels reaches a predetermined number of skip bands, a skip notification is output, and the main scanning movement of the recording head is stopped. When a skip control operation for conveying only the image forming medium in the sub-scanning direction for the skip band is performed, and effective pixels other than white are detected after continuous white pixels from the image data read from the image data storage unit, the image data Image data of the discarded white pixels from the first pixel of the next line of the line outputting the skip notification to the effective pixel is temporarily stopped from reading the image data from the storage means. The data generated and output based on the number of continuous white pixels is characterized by forming an image.

  Further, in the skip control operation, the present invention reads the image data of the image data storage means and simultaneously performs white detection of the image data to discard the detected white pixels and count the number of consecutive white pixels and the skip notification. An input control operation for temporarily stopping reading of image data from the image data storage means by detecting the effective pixel, restarting reading of the image data, and restarting white detection, and detecting by the input control operation The effective pixel storing operation for storing the effective pixel in the effective pixel storing means, and generating and outputting the image data of the white pixel discarded until the effective pixel is detected when the effective pixel is detected by the input control operation. And an output control operation for outputting an effective pixel stored in the effective pixel storage means.

  According to the present invention, by applying the system controller of the page image forming apparatus, it is possible to appropriately perform skip processing even on a wide and long image and perform line image forming processing at high speed and at low cost.

  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 6 are diagrams illustrating an embodiment of an image forming apparatus, an image forming control method, an image forming control program, and a recording medium according to the present invention. FIG. 1 illustrates an image forming apparatus and an image forming control according to the present invention. 1 is a block diagram of a main part of a composite apparatus 1 to which an embodiment of a method, an image formation control program and a recording medium are applied.

  In FIG. 1, the multifunction device 1 includes a scanner unit 2, an engine unit 3, an inkjet head unit 4, a system controller unit 5, a hard disk (HDD) 6, and the like, although not shown, an operation display unit, a communication unit, and the like. And executes complex functions such as a scanner function, a printer function, a copy function, and a facsimile function. The composite apparatus 1 is an ink ejection method, performs recording on a wide paper (image forming medium), for example, A0 size paper as a standard size, and a long paper, for example, A0 width (841 mm) as a special size. It supports image formation (printing) output on a wide roll paper or roll cloth having a length of 15 m. The composite apparatus 1 includes a communication unit (not shown) to which a host device HS such as a computer is connected via a network such as a LAN (Local Area Network) or a wired or wireless communication line such as a dedicated communication line. The multifunction apparatus 1 performs communication processing with the host apparatus HS via the communication unit and receives print data from the host apparatus HS.

  The operation display unit includes various operation keys and a display unit (liquid crystal display or the like), and various operations for causing the multifunction apparatus 1 to perform various processes are performed from the operation keys. The operation display unit displays the input content from the operation keys and various information notified to the user from the multifunction apparatus 1 on the display unit.

  The engine unit (image formation control unit) 3 includes a scanner-side image processing unit 11, an engine CPU (Central Processing Unit) 12, a head control unit (head control unit) 13, a controller I / F control unit 14, and an image data control unit 15. The image data control unit 15 includes a memory control unit (memory control unit) 21, a skip memory (image data storage unit) 22, and a skip control unit (skip control unit) 23. Etc. The skip control unit 23 includes an input control unit 31, a data storage buffer 32, an output control unit 33, and the like.

  The system controller unit (system control unit) 5 includes an image memory access control unit 41, an image memory (image storage unit) 42, a CPU (not shown), a ROM (Read Only Memory), a RAM (Random Access Memory), an image processing unit, and the like. I have.

  In the composite apparatus 1, the system controller unit 5 uses the system controller unit of a page image forming apparatus such as a laser printer, and the software of the system controller unit of the page image forming apparatus is used as much as possible. Yes. The scanner unit 2, the scanner-side image processing unit 11, and the controller I / F control unit 14 are also appropriately configured as a page image forming apparatus, for example, a scanner unit such as a page complex apparatus or a page facsimile apparatus, a scanner-side image processing unit, and a controller. The I / F control unit can be diverted.

  As the scanner unit 2, for example, a color image scanner using a CCD (Charge Coupled Device) is used. The scanner unit 2 irradiates a color original with reading light from a light source, collects reflected light from the color original on a light receiving element such as a CCD via a mirror and a lens, and performs photoelectric conversion by the light receiving element. The color document is scanned in the main and sub-scans to read the color image of the color document, and the RGB color image signal is digitally converted and then output to the scanner-side image processing unit 11 of the engine unit 3.

  The ink jet head unit (image forming unit) 4 is an ink jet head that ejects C (cyan), M (magenta), Y (yellow), and K (black) inks under the control of the head control unit 13. A carriage mounted with a head that reciprocates in the main scanning direction, a carriage drive unit that reciprocates the carriage in the main scanning direction, and a sheet that ejects ink from the ink jet to form a sheet in the sub-scanning direction A transport mechanism unit and the like are provided, and under the control of the head control unit 13 based on the image data sent from the head side image processing unit 16, a predetermined line is set as one band from the inkjet head, and ink for the one band is simultaneously used. The ink-jet head is moved in the main scanning direction while ejecting the image, and one band (several lines) is simultaneously imaged. It is formed.

  Under the control of the engine CPU 12, the scanner-side image processing unit 11 is uniform with respect to RGB color image data from the scanner unit 2 due to variations in the light source of the scanner unit 2, sensitivity variations for each pixel of the CCD, and the like. Image processing such as shading correction, background removal, and fixed-length encoding for correcting a phenomenon in which read data varies despite reading a document having a high density is output to the controller I / F control unit 14.

  The controller I / F control unit 14 controls the arbitration of memory access and transfers image data between the engine unit 3 and the system controller unit 5.

  The head control unit 13 controls the inkjet head unit 4 and paper conveyance, and also asserts a band transfer start signal to the skip control unit 23 in response to an instruction from the engine CPU 12, and sends an image to the skip control unit 23 in units of bands. Request data transfer.

  The memory control unit 21 of the image data control unit 15 is connected to the skip memory 22 and the skip control unit 23, and is also connected to the controller I / F control unit 14, via the controller I / F control unit 14. Then, a data transfer request is made to the image memory access control unit 41 of the system controller unit 5, and the image data of the image memory 42 of the system controller unit 5 is received and written to the skip memory 22. Further, the memory control unit 21 issues an instruction to stop writing and reading image data to the controller I / F control unit 14 and the skip control unit 23 according to the storage state of the image data in the skip memory 22, and skip memory Control is performed to prevent 22 overwriting and empty reading.

  The skip memory 22 stores the image data sent from the image memory 42 of the system controller 5 under the control of the memory control unit 21, and is read out by the memory control unit 21 and transferred to the skip control unit 23. .

  As described above, the skip control unit 23 includes the input control unit (input control unit) 31, the data storage buffer (effective pixel storage unit) 32, and the output control unit (output control unit) 33. The image data read from the image (hereinafter referred to as detection target image data as required) is simultaneously detected for each pixel to determine whether the image data is a white pixel. The white pixels are discarded, the number of continuous white pixels is counted by a continuous white pixel number counter, and a skip notification is output when the number of continuous white pixels reaches a predetermined number of skip bands. When the skip control unit 23 detects the valid pixels other than white after the continuous white pixels by performing the white detection, the skip control unit 23 temporarily stops reading the image data from the skip memory 22 and outputs the skip notification. Image data of the discarded white pixels from the first pixel of the next line of the line to the effective pixels is generated based on the number of continuous white pixels and output to the inkjet head unit 4 via the head-side image processing unit 16.

  The input control unit 31 is a white pixel in pixel units for the image data transfer request to the memory control unit 21 and the detection target image data transferred from the skip memory 22 by the memory control unit 21 in response to the transfer request. The white detection is executed to detect whether or not, and the continuous white pixel number information indicating how many white pixels (white data) are continuous is recorded in the continuous white pixel number counter which is an internal counter. Further, the input control unit 31 has an interrupt generation function for generating a blank band notification interrupt to the engine CPU 12, and all the data for the preset number of skip bands (interrupt blank bands) is white data. Then, a blank band notification interrupt is generated in the engine CPU 12 to notify the blank band (skip notification).

  When the input control unit 31 continuously detects white data and detects valid data (data other than white), the data storage buffer 32 is read for a predetermined number of pixels (the image data reading speed from the skip memory 22 and the valid data). The effective pixel data of pixels determined by a delay time or the like from the detection of the pixel until the reading of the image data from the skip memory 22 is stopped is temporarily stored. That is, the input control unit 31 continuously receives image data from the skip memory 22 and performs white detection, discards the pixel data determined to be white as it is, and how many pixel white data are continuous. Only the continuous white pixel number information is counted by the continuous white pixel number counter, and the process of detecting the white of the next pixel data is repeated. Therefore, the input control unit 31 temporarily stores the effective pixel other than the white pixel after the white pixel in the data storage buffer 32 because the effective pixel cannot be discarded.

  In response to the band transfer start signal from the head control unit 13, the output control unit 33 generates white data based on the continuous white pixel number information that is counter information of the internal counter in the input control unit 31. The white data is transferred to the head side image processing unit 16. That is, as described above, the input control unit 31 detects, for each pixel, whether the detection target image data is white data. If the detection target image data is a white pixel, only the continuous white pixel number information is detected. Since the white image data is discarded by counting by the counter, the output control unit 33 outputs the discarded continuous white image data to the continuous white image data in order to operate the inkjet head unit 4 normally. It is generated based on the pixel number information and output to the head side image processing unit 16. When the output control unit 33 generates all the discarded white image data based on the continuous white pixel number information, the output control unit 33 subsequently outputs the valid data stored in the data storage buffer 32 to the head side image processing unit 16. To do.

  The head-side image processing unit 16 performs rendering of fixed-length encoding, gradation processing, and the like on the image data input from the output control unit 33 of the skip control unit 23 under the control of the engine CPU 12 and performs rendering. Output to the inkjet head unit 4.

  The system controller unit 5 executes processing as the composite device 1 by controlling each part of the composite device 1 while using the RAM as a work memory based on a program in the ROM. As described above, the system controller unit of the page image forming apparatus is diverted to the composite apparatus 1, and the software of the system controller of the page image forming apparatus is also diverted as much as possible. Further, as described above, the scanner unit 2, the scanner-side image processing unit 11, and the controller I / F control unit 14 are also appropriately configured as a page image forming apparatus, for example, a scanner unit such as a page complex apparatus or a page facsimile apparatus, or a scanner side. The image processing unit and the controller I / F control unit can be used.

  The multifunction apparatus 1 forms an image with the inkjet head unit 4 based on image data (scanner image data) of a document read by the scanner unit 2 and image data (received image data) received from the host device HS. The unit 5 is a built-in image processing unit that converts the scanner image data and the received image data into CMYK image data.

  For example, as shown in FIG. 2, the image memory 42 has a pair of toggle buffers Buf1 to Buf8 for each version of CMYK (in this embodiment, each color). The image forming apparatus has only a capacity for storing image data corresponding to several lines of paper size width capable of image formation.

  The multifunction apparatus 1 captures wide and long image data and forms an image with the inkjet head unit 4 for each band. Therefore, the image data is captured in the image memory 42 and necessary image processing is performed. Then, when the image data is transferred to the engine unit 3, the image memory 42 provided in the system controller unit 5 using the system controller unit of the page image forming apparatus has insufficient memory capacity. Image data (scanner image data) and image data (received image data) received from the host device HS are stored, and transfer of image data from the HDD 6 to the toggle buffers Buf1 to Buf8 of the image memory 42 is performed in the toggle buffers Buf1 to Buf8. DMAC (Direct Memory Access Controller: D Performing the DMA transfer using the A controller).

  The image memory access control unit 41 responds to a data transfer request for image data sent from the memory control unit 21 of the image data control unit 15 provided in the engine unit 3 via the controller I / F control unit 14. The image data is read out from each toggle buffer Buf1 to Buf8 of each pair of the image memory 42 in turn and transferred to the memory control unit 21.

  The composite apparatus 1 includes a ROM, 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-RW (Compact Disc Rewritable), a DVD ( An image forming control program for executing the image forming control method of the present invention recorded on a computer-readable recording medium such as a digital video disk (SD), a secure digital (SD) card, or an MO (Magneto-Optical Disc) is read. By introducing it into the ROM of the system controller unit 5 or the ROM (not shown) of the engine unit 3, the system controller unit of the page image forming apparatus to be described later can be used to perform line processing while skipping wide and long image data. Appropriate and efficient image data transfer processing and white detection when forming It is constructed as an image forming apparatus for executing image formation control method. This image formation control program is a computer-executable program written in a legacy programming language such as assembler, C, C ++, C #, Java (registered trademark), an object-oriented programming language, or the like, and is stored in the recording medium. And can be distributed.

  Next, the operation of this embodiment will be described. The composite apparatus 1 of the present embodiment diverts the system controller unit of the page image forming apparatus, and performs image data transfer processing and white detection when line image formation is performed while skipping wide and long image data. To do it properly and efficiently.

  That is, in the case of the copy function, the multifunction apparatus 1 converts the digital RGB image data obtained by reading the color image of the document by the scanner unit 2 into the scanner side of the engine unit 3 as indicated by the data transfer line L1 in FIG. After the image processing unit 11 performs necessary image processing, the read image data of the original is transferred to the system controller 5 via the controller I / F control unit 14. The system controller unit 5 performs necessary image processing on the image data sent via the controller I / F control unit 14 under the control of the CPU, and generates CMYK image data in particular. Stored in the HDD 6.

  Further, in the case of the printer function, when the print function is transmitted from the host apparatus HS via the communication line as shown by the data transfer line L2 in FIG. 1, the multifunction apparatus 1 transmits the print data to the communication unit. The image data received from the communication unit is subjected to necessary image processing by the image processing unit under the control of the CPU, and in particular, CMYK. Image data is generated and stored in the HDD 6.

  As shown in FIG. 2, the system controller unit 5 sequentially transfers the image data stored in the HDD 6 to the corresponding toggle buffers Buf1 to Buf8 of the image memory 42 by DMA transfer based on descriptors for each color.

  When image data is written in the toggle buffers Buf1 to Buf8, the image memory access control unit 41 of the system controller unit 5 grants read permission to the memory control unit 21 of the image data control unit 15 of the engine unit 3 as shown in FIG. The memory control unit 21 of the image data control unit 15 requests the image memory access control unit 41 for image data for the descriptor size. As shown by a data transfer line L3 in FIG. 1, the image memory access control unit 41 reads out image data of descriptor size from the image memory 42 and transfers it to the skip memory 22 of the image data control unit 15, and also provides a toggle buffer. When image data is stored in the other toggle buffers Buf1 to Buf8 that are paired with Buf1 to Buf8, the process of notifying the image data control unit 15 of read permission is repeatedly performed.

  However, in the composite apparatus 1, as described above, the input control unit 31 of the skip control unit 23 sequentially reads the image data of the skip memory 22 via the memory control unit 21, and reads the image data for each pixel as a white pixel. If it is a white pixel (white data), the white data is discarded and the number of continuous white pixels indicating how many white pixels are continuous is recorded in the internal counter. As shown in FIG. 3, when the white pixel line continues for the preset number of skip bands (2 bands in FIG. 3), a blank band notification interrupt is generated in the engine CPU 12 to notify the blank band. And carry the paper for the blank band. In FIG. 3, the hatched pixel portion is an effective pixel, and the other pixels are white pixels. In FIG. 3, band numbers N = 0 and 1 are all white pixels where the line pixels are white, and effective pixels continue from the third line of N = 2 to the fifth line of N = 4 band. Is shown. Therefore, in FIG. 3, when it is detected that the last pixel of N = 1 band is a white pixel, the input control unit 31 of the skip control unit 23 causes the engine CPU 12 to generate a blank band notification interrupt.

  As described above, when the image data is continuously white pixels, the input control unit 31 discards the image data of the white pixels and performs white detection of the next image data. The whitening detection process is performed at high speed, and the transfer speed of the image data sent from the skip memory 22 to the input control unit 31 via the memory control unit 21 is increased. As a result, the memory control unit 21 requests image data of the next descriptor size to be processed from the image memory access control unit 41 of the system controller unit 5, and the image memory access control unit 41 stores the image data in the image memory 42. The image data in the toggle buffers Buf 1 to Buf 8 is transferred to the skip memory 22.

  However, if the number of white pixels to be discarded by the input control unit 31 increases because the white pixels are continuous in the image data, the memory control unit 21 frequently makes a data transfer request for image data to the system controller unit 5, The DMA transfer of the image data based on the descriptor from the HDD 6 to the toggle buffers Buf1 to Buf8 of the image memory 42 is not in time for the read request from the memory control unit 21, and the next image data is read from the HDD 6 as the reading target of the image memory 42. This causes a situation in which reading occurs in a state where the data is not written in the toggle buffers Buf1 to Buf8. When such a situation occurs, the image data becomes abnormal and the image quality deteriorates.

  Therefore, as shown in FIG. 4, the digital multi-function apparatus 1 of the present invention waits for the read permission to the image memory 42 until the writing of the image data to at least the next toggle buffers Buf1 to Buf8 of the image memory 42 is completed. Thus, in a state where the next image data is written in the toggle buffers Buf1 to Buf8, the image data control unit 15 is given read permission, and the image data control unit 15 takes in the defective image data into the skip memory 22. To prevent. In FIG. 4, one pair of toggle buffers Buf1 to Buf8 (toggle buffer Buf1 and toggle buffer Buf2, toggle buffer Buf3 and toggle buffer Buf4, toggle buffer Buf5 and toggle buffer Buf6, toggle buffer Buf7 and toggle buffer Buf8 are included. The image data transfer control process when the toggle buffer Buf1 and the toggle buffer Buf2 are used is shown. The image data transfer control process using the toggle buffer Buf1 and the toggle buffer Buf2 is described below. explain.

  That is, as shown in FIG. 4, when the system controller unit 5 transfers image data of descriptor size from the HDD 6 to the toggle buffer Buf1 and toggle buffer Buf2 of the image memory 42 by DMA transfer using the descriptor, the data is stored ( In step S1), the image memory access control unit 41 first notifies read permission of the toggle buffer Buf1 to the memory control unit 21 of the image data control unit 15 (step S2), and is used for data transfer from the HDD 6 to the toggle buffer Buf1. The image memory access control unit 41 is requested to transfer the image data having the descriptor size of the descriptor 1 thus obtained.

  When the image memory access control unit 41 permits the memory control unit 21 of the image data control unit 15 to read the image data from the toggle buffer Buf1 of the image memory 42, the memory control unit 21 reads the data of the toggle buffer Buf1. ,stand by. When the image memory access control unit 41 completes reading the descriptor information of the descriptor 1 for the number of lines from the toggle buffer Buf1 of the image memory 42, the image CPU 42 sets a pause interrupt, and the software of the engine CPU 12 receives the pause interrupt. Thus, it is confirmed that the data read of the toggle buffer Buf1 is completed.

  That is, since image data is prepared in the next toggle buffer Buf2, the image memory access control unit 41 notifies the memory control unit 21 of the image data control unit 15 of permission to read the toggle buffer Buf2 (step S7). ), The procedure from step S3 to step S7 is executed, and the image data having the descriptor size of descriptor 2 used for data transfer from the HDD 6 to the toggle buffer Buf2 is transferred from the image memory 42 to the skip memory 22. Then, the system controller unit 5 performs the DMA transfer by the descriptor from the HDD 6 to the toggle buffer Buf1 that has been previously transferred during the transfer procedure of the image data to the toggle buffer Buf2, but the image memory access control unit 41 is the process of step S5, and after completion of reading the number of lines of descriptor information of descriptor 1, image data of the number of lines of descriptor information based on the next descriptor 1 (the data size set by the descriptor) Waits until the DMA transfer to the toggle buffer Buf1 and a pause interrupt is generated. With this pause interrupt, the software knows that the data reading of the toggle buffer Buf1 has been completed and the writing of the next image data has been completed.

  As described above, in the multifunction apparatus 1 of this embodiment, the system controller unit 5 temporarily stores the input image data in the HDD 6, and then transfers the input image data to the image memory 42 having a smaller capacity than the HDD 6. Is transferred to the engine unit 3 in response to a read request from the engine unit 3, and the engine unit 3 detects whether the image data transferred from the system controller unit 5 in response to the read request is a white pixel. Are sequentially performed for each pixel, and when white pixels continue for a predetermined skip line (skip band), as will be described in detail later, the main scanning movement of the inkjet head unit 4 is stopped, and only the paper is skipped for the skip line. A skip operation for carrying in the scanning direction is performed, and the system controller unit 5 completes the transfer of the image data in the image memory 42 to the engine unit 3. , Issues a read permission of the image data to the engine unit 3, the engine unit 3 receives the read permission, and issues a read request for the image data.

  Therefore, when a line image formation with skip processing is performed using the system controller of the page image forming apparatus as the system controller 5, a read request from the engine unit 3 to the toggle buffers Buf1 to Buf8 of the image memory 42 is It is possible to reliably overtake the DMA transfer using the image data descriptor from the HDD 6 to the toggle buffers Buf1 to Buf8, and to transfer the appropriate image data, thereby preventing the deterioration of the image quality. Thus, appropriate image formation can be performed at high speed.

  In this case, the image data control unit 15 of the engine unit 3, particularly the memory control unit 21 waits until a read permission is sent from the image memory access control unit 41 of the system controller unit 5, but from the HDD 16 to the image memory 42. If there is a defect in the path of the image memory access control unit 41, the read permission may not be sent. Therefore, if the memory control unit 21 does not receive the read permission even after a predetermined read permission waiting time elapses, the memory control unit 21 displays a failure display on the display unit of the operation display unit via the engine CPU 12. Alternatively, a service call such as a failure notification may be processed at the time of abnormality to prompt prompt action.

  In this way, it is possible to prevent the composite apparatus 1 from falling into a stop state with an unknown cause, or to perform appropriate processing.

  When the CPU of the system controller unit 5 confirms the completion of the transfer of image data from the HDD 6 to the toggle buffers Buf1 to Buf8 of the image memory 42, it receives a read request from the memory control unit 21 of the image data control unit 15. If a read request is not received even after a preset read request waiting time has elapsed, a failure display etc. is displayed on the display unit of the operation display unit, and an error such as a service notification such as a failure notification is displayed. Time processing may be performed to prompt prompt response.

  In this way, it is possible to prevent the composite apparatus 1 from falling into a stop state with an unknown cause, or to perform appropriate processing.

  As these waiting times, for example, a waiting time that affects the productivity of the image forming output of the composite apparatus 1 (for example, a time delayed by a predetermined delay% time with respect to the normal image forming output time). It may be calculated and set.

  Further, when the image memory access control unit 41 of the system controller unit 5 gives a read permission to the memory control unit 21 of the image data control unit 15, it waits for a read request from the memory control unit 21. If a predetermined read request waiting time set in advance is not received, a failure display etc. is displayed on the display section of the operation display section, and when a service call such as a failure notification is abnormal Processing may be performed to prompt prompt action.

  In this way, it is possible to prevent the composite apparatus 1 from falling into a stop state with an unknown cause, or to perform appropriate processing.

  In addition, the system controller unit 5 sets a read request from the image data control unit 15 in advance even though the image memory access control unit 41 gives a read permission to the memory control unit 21 of the image data control unit 15. If the predetermined waiting time is not received, the read permission may be issued to the image data control unit 15 again.

  In this way, when the image data control unit 15 cannot recognize the read request due to a hardware abnormality or the like on the engine unit 3 side, it is possible to increase the opportunity to avoid the multifunction device 1 falling into a process stop. Ensuring proper operation can be improved.

  Further, when there is a read request from the memory control unit 21, the image memory access control unit 41 sets the data size of the image data by the read request and the data set by the descriptor by the DMA transfer from the HDD 6 to the image memory 42. Compared to the size, if the data size of the read request exceeds the data size of the descriptor, it is determined that appropriate data transfer cannot be performed, and the failure display etc. is displayed on the display unit of the operation display unit, etc. It is also possible to perform an emergency process such as a service call to prompt prompt action.

  In this way, it is possible to prevent the composite apparatus 1 from falling into a stop state with an unknown cause, or to perform appropriate processing.

  When the image data control unit 15 of the engine unit 3 receives the image data transferred to the skip memory 22 as described above, the input control unit 31 of the skip control unit 23 performs the data transfer line of FIG. As shown in L4, image data is sequentially read from the skip memory 22 via the memory control unit 21 to perform white detection. However, when processing wide image data, the image data read from the skip memory 22 is skipped. If stored on the control unit 15 side, a large-capacity memory is required and the cost is high.

  Therefore, as the skip memory 22, a memory having a capacity for storing several lines of image data is used. As shown in FIG. 5, the input control unit 31 of the skip control unit 23 receives the image data from the skip memory 22. White detection is performed simultaneously with reading. That is, in the engine unit 3, as shown in FIG. 5, first, the engine CPU 12 issues a band data transfer start command to the input control unit 31 (step a in FIG. 5), and the input control unit 31 performs the memory control unit 21. Is requested to transfer image data (step b in FIG. 5). The memory control unit 21 transfers image data to the input control unit 31 when a preset set data amount is accumulated in the skip memory 22 (step c in FIG. 5). In this case, the memory control unit 21 does not transfer the image data to the input control unit 31 when the image data larger than the set data amount is not stored in the skip memory 22, and the setting is not performed. It waits for image data larger than the amount of data to be accumulated in the skip memory 22.

  When the image data is sent from the memory control unit 21, the input control unit 31 performs white detection (white determination) on the image data, and discards the white pixel image data itself if it is a white pixel. The process of counting the number of continuous white pixels with the continuous white pixel number counter and requesting the next image data from the memory control unit 21 is repeated as long as the white pixels continue (steps d and c in FIG. 5). The input control unit 31 repeatedly performs white detection, counting by the continuous white pixel number counter of white pixels and the request for the next image data, and transfer of the image data from the memory control unit 21 to obtain a continuous white pixel number counter. When the count value reaches the preset number of skip bands (in this embodiment, two bands as shown in FIG. 3), a blank band notification interrupt is generated to the engine CPU 12 to perform skip notification (FIG. 5). Step e) When the blank band notification interrupt is received, the engine CPU 12 causes the head control unit 13 to perform a skip operation process set in advance, and also makes a next band transfer request to the input control unit 31 ( Step f) in FIG. As described above, the head control unit 13 stops the reciprocating movement of the carriage on which the inkjet head of the inkjet head unit 4 is mounted in the main scanning direction as the skip process, and the blank band (blank line) is caused by the sheet transport mechanism unit. The process of carrying the paper for the minute is executed.

  As shown in the fourth line of the N = 2 band in FIG. 3, when the input control unit 31 detects an effective pixel for image formation other than a blank, the input control unit 31 stores the effective pixel data in the data storage buffer 32 (see FIG. 3). 5 step g), a data transfer stop command is issued to the memory control unit 21 (step h in FIG. 5). The memory control unit 21 stops the transfer of the image data in the skip memory 22 to the input control unit 31 in response to the data transfer stop command (step h in FIG. 5).

  On the other hand, the output control unit 33 of the skip control unit 23 generates white data for the discarded white pixels (continuous white pixels) from the count value of the continuous white pixel number counter of the input control unit 31, and the head side image processing unit 16 (step i in FIG. 5). For example, in FIG. 3, head side image processing is performed by generating white data from the first white pixel in the first line of the N = 2 band, which is the next line after the skip line, to the white pixel before the effective pixel in the fourth line. To the unit 16. When the white data is generated and output, the output control unit 33 subsequently reads the effective data stored in the data storage buffer 32 and outputs the effective image data to the head-side image processing unit 16 (see FIG. 5 step j).

  Similarly to the above, the input control unit 31 makes a data transfer request for image data to the memory control unit 21 (step b in FIG. 5), and the memory control unit 21 is preset in the skip memory 22. When the set data amount is accumulated, the image data is transferred to the input control unit 31 (step c in FIG. 5).

  When the image data is sent from the memory control unit 21, the input control unit 31 performs a process of transferring the image data to the head-side image processing unit 16 without performing white detection (white determination). Are repeated until the last pixel of the last line in the band in which (1) exists (steps c and k in FIG. 5).

  When the input control unit 31 performs processing for transferring the image data read from the skip memory 22 up to the last pixel of the band to the head side image processing unit 16, a band transfer completion interrupt is generated in the engine CPU 12 ( In step l) of FIG. 5, upon receiving the band transfer completion interrupt, the engine CPU 12 returns to the initial process, issues a band data transfer start command to the input control unit 31, and performs the same process as described above for the image data. The process is executed until the process is completed (step a to step l in FIG. 5).

  The engine CPU 12 executes the image formation control process as shown in FIG. That is, the engine CPU 12 first sets the band number N to “0” at the beginning of the page (step S101), and checks whether the band number N is the number of bands for one page (step S102). If it is not the number of bands, a processing address is set to the first pixel of the first line of the Nth band (step S103). Next, the input control unit 31 makes a data transfer request to the memory control unit 21 (step S104), the input control unit 31 performs white detection (white determination) (step S105), and the pixel is white. It is checked whether it is a pixel (white data) (step S106).

  If the detection target pixel is a white pixel, the input control unit 31 counts the number of continuous white pixels by a continuous white pixel number counter and performs a white pixel number counting process for discarding the white pixels (step S107). In this white pixel count processing, the input control unit 31 first increments the white pixel counter H_CNT that counts the number of white pixels per pixel by “1” (step S201), and the count value of the white pixel counter H_CNT is the main value. It is checked whether the scan size (number of pixels in one line) has been reached (step S202). If the count value of the white pixel counter H_CNT is not equal to the number of pixels in one line in step S202, the input control unit 31 exits from the white pixel number counting process, returns to step S104, and returns to the input control unit 21. The processing similar to the above is performed from the processing for making the data transfer request (steps S104 to S107). When the white pixel counter H_CNT is the main scanning size (the number of pixels in one line) in step S202, the line white pixel counter L_CNT Is incremented by “1” (step S203), and it is checked whether the count value of the line white pixel counter L_CNT has reached the number of lines in one band (step S204).

  In step S204, when the count value of the line white pixel counter L_CNT has not reached the number of lines in one band, the input control unit 31 returns to step S104 and starts processing for making a data transfer request to the input control unit 21. Processing is performed in the same manner as above (steps S104 to S107). When the count value of the line white pixel counter L_CNT reaches the number of lines in one band in step S204, the count value of the band white pixel counter B_CNT is incremented by “1”. Then (step S205), the white pixel number counting process is exited, and it is checked whether the continuous white data has reached a preset number of skip bands (step S108).

  In step S108, when the number of lines of continuous white pixels has not reached the preset skip band number, the input control unit 31 returns to step S102, and the incremented band number N is the number of bands for one page. From this check, the same processing as described above is performed (steps S102 to S108). If the number of lines of continuous white pixels has reached the number of skip bands in step S108, the input control unit 31 generates a blank band notification interrupt to the engine CPU 12 to perform skip notification, and performs the skip processing to the engine CPU 12. At the same time, the band number N is incremented by “1” (step S110), the process returns to step S102, and the same processing as described above is performed from checking whether the band number N is the number of bands for one page (step S102˜). S110).

  When the white detection target pixel is not white data in step S106, that is, when it is valid pixel data, the input control unit 31 stores the valid pixel data in the data storage buffer 32 (step S111), and the memory control unit 21. A data transfer stop command is issued (step S112).

  The output control unit 33 generates white data for the discarded white pixels based on the count value (counter information) of the continuous white pixel number counter of the input control unit 31, and outputs the white data to the head-side image processing unit 16 as the subsequent stage. Next, the input control unit 31 passes the valid data stored in the data storage buffer 32 to the output control unit 33, and the output control unit 33 outputs the data to the head side image processing unit 16 (step S113). S114). The input control unit 31 makes a transfer request (data transfer request) for the next image data to the memory control unit 21 (step S115), and without skipping white detection, the skip memory 22 remains as it is until the last image data of the band. Is transferred to the head-side image processing unit 16 via the output control unit 33 (step S116).

  When the input control unit 31 transfers the data up to the last image data of the band having the valid pixel data, the input control unit 31 issues a band transfer completion interrupt to the engine CPU 12, and the engine CPU 12 increments the band number N by “1”. (Step S117), the process returns to Step S102, and processing is performed in the same manner as described above from checking whether the band number N is the number of bands for one page (Steps S102 to S117).

  If the band number N is the number of bands for one page in step S102, it is determined that the image forming process for one page has been completed, and the process ends.

  In the above description, in the band in which the effective pixel is detected, white detection is not performed on the pixels read from the skip memory 22 until the last pixel data of the band after the effective pixel detection. Although the pixel data is output as it is to the head-side image processing unit 16 at the subsequent stage, the image processing method for the image data of the band in which the effective pixel is detected is not limited to the above method. For example, with respect to the image data of the band in which the effective pixel is detected, whether white detection is sequentially performed, the white pixel is discarded and the number of continuous white pixels is counted by the continuous white pixel number counter, and then the effective pixel is detected. When processing is performed up to the end of the band, white image data for the continuous white pixels may be generated by the output control unit 33 and output to the head-side image processing unit 16.

  As described above, in the multifunction apparatus 1 according to the present embodiment, the skip control unit 23 reads the image data in the skip memory 22 that stores the image data, and at the same time, detects whether the image data is a white pixel. Are sequentially performed for each pixel, and when white pixels continue, the white pixels are discarded and the number of continuous white pixels is counted, and a skip notification is output when the number of continuous white pixels reaches a preset number of skip bands. Then, the main scanning movement of the ink-jet head unit 4 is stopped, and a skip operation for carrying only the paper for the skip band is performed. When the multifunction apparatus 1 detects an effective pixel other than white after a continuous white pixel from the image data read from the skip memory 22, it temporarily stops reading the image data from the skip memory 22 and skips the skip. The image data of the discarded white pixels from the first pixel of the next line of the line outputting the notification to the effective pixel is generated based on the number of continuous white pixels, and is sent to the head side image processing unit 16 and the inkjet head unit 4 An image formation control operation for forming an image is performed.

  Therefore, the composite apparatus 1 uses the system controller unit 5 of the page image forming apparatus to perform line image formation while performing skip processing on a wide and long image. , White detection is performed at the same time that white pixels are discarded, and when the valid pixels are detected, data reading from the skip memory 22 is temporarily stopped. Therefore, the system controller unit of the page image forming apparatus is used as the system controller unit 5. Even when diverted, an image can be formed by appropriately performing skip processing without using a large-capacity memory as the skip memory 22, and line image formation processing can be performed at high speed and at low cost.

  Also, the multifunction apparatus 1 of this embodiment includes an HDD 6 that stores input image data, and an image memory 42 that has a smaller capacity than the HDD 16. After the input image data is temporarily stored in the HDD 6, the image memory 42 sequentially stores the input image data. And a system controller unit 5 that transfers the image data of the image memory 42 in response to a data transfer request from the image data control unit 15 of the engine unit 3, and the image data control unit 15 includes the memory controller 21. A memory control unit 21 is further provided for making a data transfer request to the image data control unit 15 according to the availability and storing the image data received from the system controller unit 5 in the skip memory 22. White detection is performed simultaneously with the acquisition of image data from the skip memory 22 via the memory control unit 21.

  Therefore, without using a large-capacity memory as the skip memory 22, image data is appropriately stored in the skip memory 22 even for wide and long image data, and image processing with skip processing is appropriately performed. The line image forming process can be performed at high speed and at low cost.

  Furthermore, in the composite apparatus 1 of this embodiment, the skip control unit 23 reads the image data in the skip memory 22 and simultaneously performs white detection on the image data to discard the detected white pixels and count the number of consecutive white pixels. And an input control unit 31 that temporarily stops reading image data from the skip memory 22 and resumes reading image data from the skip memory 22 and resumes white detection by detecting a valid pixel. And a data storage buffer 32 for storing effective pixels detected by the input control unit 31, and when the input control unit 31 detects effective pixels, it generates image data of white pixels discarded until the effective pixels are detected, and the head The effective pixel stored in the data storage buffer 33 is output to the head side image processing unit 16 while being output to the side image processing unit 16. That an output control section 33, and a.

  Therefore, white detection by the input control unit 31 and data output by the output control unit 33 can be performed in parallel, and the processing efficiency can be improved and the image forming speed can be further increased.

  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 forming apparatus that uses a system controller of a page image forming apparatus and performs line image formation by an ink jet type or the like that forms a line image at high speed and appropriately while skipping wide image data. The present invention can be used for a formation control method, an image formation control program, and a recording medium.

The principal part block block diagram of the compound apparatus to which one Example of this invention is applied. FIG. 2 is a block configuration diagram of a system controller unit and an image data control unit in FIG. 1. Explanatory drawing of image data and blank band notification interruption generation timing. FIG. 6 is a timing chart showing image data transfer control processing. Explanatory drawing of the image data processing by the engine side. 5 is a flowchart showing image formation control processing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compound apparatus 2 Scanner part 3 Engine part 4 Inkjet head part 5 System controller part 6 Hard disk (HDD)
11 Scanner-side image processing unit 12 Engine CPU
DESCRIPTION OF SYMBOLS 13 Head control part 14 Controller I / F control part 15 Image data control part 16 Head side image processing part 21 Memory control part 22 Memory for skip 23 Skip control part 31 Input control part 32 Data storage buffer 33 Output control part 41 Image memory access Control unit 42 Image memory

Claims (7)

When the recording head is moved in the main scanning direction and a predetermined number of lines of image data input to the image forming medium is set as one band, a dot image is formed for each band based on the image data, and image formation of the band is completed. Image forming means comprising: image forming means for conveying the image forming medium in the sub-scanning direction by the amount of the band; and image forming control means for controlling the operation of the image forming means and outputting image data to the image forming means. In the device
The image formation control means includes image data storage means for storing image data;
At the same time as reading the image data in the image data storage means, white detection is performed for each pixel to determine whether or not the image data is a white pixel, and if it is a white pixel, the white pixel is discarded and the number of continuous white pixels is determined. A white pixel counting unit to count,
A skip notification output unit that outputs a skip notification when the number of continuous white pixels reaches a predetermined number of skip bands ;
When an effective pixel other than white is detected after a white pixel after the skip notification is output , reading of image data from the image data storage unit is temporarily stopped, and the next line of the line that outputs the skip notification is Image data of discarded white pixels from the first pixel to the effective pixel is generated based on the number of continuous white pixels and output to the image forming unit, and the white pixel is output after the white pixel without outputting the skip notification. A skip control unit that generates a white pixel based on the count value of the number of continuous white pixels and outputs the white pixel to the image forming unit .
An image forming apparatus comprising: a head control unit that stops the main scanning movement of the recording head and conveys only the image forming medium by the skip band when the skip control unit issues a skip notification. apparatus.   The image forming apparatus includes a large-capacity storage unit having a predetermined large capacity and storing input image data, and an image storage unit having a smaller capacity than the large-capacity storage unit. System control means for transferring the image data of the image storage means in response to a data transfer request from the image formation control means after being stored in the capacity storage means and sequentially transferred to the image storage means. The formation control means includes a memory control means for making a data transfer request to the system control means in accordance with the availability of the image data storage means and storing the image data received from the system control means in the image data storage means. The skip control means acquires the image data from the image data storage means via the memory control means and simultaneously performs the white detection. The image forming apparatus according to claim 1, in which.   The skip control means reads the image data in the image data storage means and simultaneously performs white detection of the image data to discard the detected white pixels, count the number of consecutive white pixels, and perform the skip notification, Input control means for temporarily stopping reading of image data from the image data storage means upon detection of pixels, restarting reading of image data from the image data storage means, and restarting white detection; and An effective pixel storage unit that stores the detected effective pixel, and when the input control unit detects the effective pixel, generates image data of the white pixel discarded until the effective pixel is detected and generates the image data in the image forming unit Output control means for outputting effective pixels stored in the effective pixel storage means to the image forming means. The image forming apparatus according to claim 1 or claim 2 wherein the. An image forming processing step for forming a dot image based on the image data for each band by moving the recording head in the main scanning direction and setting a predetermined number of lines of image data input to the image forming medium as one band; When the image formation is completed, the image forming medium is transported in the sub-scanning direction by the amount corresponding to the band, and each step of the image forming process step and the medium transport processing step is controlled and the image data is An image formation control processing step to be transferred to the image formation processing step, and at the same time, the image data storage means for storing the image data is read, and simultaneously white detection is performed for each pixel to determine whether the image data is a white pixel. performed and white pixel count step to discard the white pixel counts the number of continuous white pixels when white pixels are consecutive, the number of continuous white pixels A skip notification output step of outputting a skip notification becomes a few minutes a constant skip band, when detecting the valid pixels other than white after white pixel in after the skip notification is output, the image data from the image data storage unit The image forming process by generating image data of the discarded white pixels from the first pixel of the next line of the line outputting the skip notification to the effective pixel based on the number of continuous white pixels And when a valid pixel other than white is detected after the white pixel without outputting the skip notification, a white pixel is generated based on the count value of the number of continuous white pixels and is sent to the image forming unit. a skip control process step of outputting, when the skip notification said skip control process step is output, stop the main scanning movement of the recording head Image formation control method characterized in that only the image forming medium in the medium conveyance processing steps by a, and a head control processing step of conveying the skipped band min.   The skip control processing step reads the image data of the image data storage means and simultaneously performs white detection of the image data to discard the detected white pixels, count the number of consecutive white pixels, and perform the skip notification. An input control processing step for temporarily stopping the reading of the image data from the image data storage means by detecting the effective pixel, restarting the reading of the image data, and restarting the white detection, and the effective detection detected by the input control processing step An effective pixel storage processing step for storing the pixel in the effective pixel storage means; and when the effective pixel is detected in the input control processing step, image data of the white pixel discarded until the effective pixel is detected to generate the image The effective pixel stored in the effective pixel storage means is output to the image forming process step. Image formation control method according to claim 4, characterized in that it comprises an output control process step of outputting the flop, the. An image forming process for forming a dot image on the basis of the image data for each band, with a predetermined number of lines of image data input to the image forming medium by moving the recording head in the main scanning direction on a computer. When the image formation of the band is completed, the image forming medium is controlled in the sub-scanning direction by the amount corresponding to the band, and each processing operation of the image forming process and the medium transfer process is controlled, and the image data is transferred to the image data. The image formation control process to be transferred to the formation process and the image data storage means for storing the image data are read and simultaneously white detection is performed for each pixel to determine whether the image data is a white pixel. a white pixel count processing pixel counts the number of continuous white pixels to discard the white pixel for continuous, when the number of continuous white pixels is a predetermined number of skipped band skip A skip notification output process of outputting the knowledge, when detecting the valid pixels other than white after white pixel in after the skip notification is output, the temporarily stop reading the image data from the image data storage means, said and transfers to the image forming process the image data of the discarded white pixel from a head pixel of the next line of the line that outputs a skip notification to the effective pixels generated based on the number of consecutive white pixels, the skip notification Skip control processing for generating a white pixel based on the count value of the number of continuous white pixels and detecting the effective pixel other than white after the white pixel without being output , and the skip control When the skip notification is output in the processing, the main scanning movement of the recording head is stopped, and only the image forming medium is transported by the skip band in the medium transport processing. Image formation control program, characterized in that to execute a head control processing that, the.   A computer-readable recording medium on which the image forming control program according to claim 6 is recorded.

Images