JP6201606B2 - Image processing apparatus, image forming apparatus, and image processing program - Google Patents

Description

  The present invention relates to an image processing apparatus, an image forming apparatus, and an image processing program.

  Patent Document 1 discloses an image processing apparatus for an image forming apparatus that forms a plurality of lines of dots in a single scan by an image forming unit, and sequentially inputs multivalued image data in the scanning direction of the image forming unit. Input means, conversion means for rearranging the multi-value image data in a direction perpendicular to the scanning direction, and a plurality of dots per pixel of the multi-value image data rearranged by the conversion means. Generating means for generating a dot pattern, wherein the dot pattern is a pattern of N × N dots (N is a natural number), and the image forming unit performs N × a (a is a natural number) line dots in one scan. Has been proposed.

  Japanese Patent Application Laid-Open No. 2004-259542 discloses a method for printing print data having a reference resolution in the sub-scanning direction of p (dpi) and a resolution in the sub-scanning direction of p · a (dpi) (a is a positive number). It is described that printing of resolution p · a (dpi) in the sub-scanning direction is realized by shifting the same region a times by 1 / (p · a) inches in the sub-scanning direction by the feeding means. The

  Patent Document 3 proposes that high-density printing is performed by arranging inkjet nozzles at an equally spaced dot pitch, moving the head in the arrangement direction, and controlling the paper feed amount. .

Japanese Patent Laid-Open No. 9-20034 JP 2004-142100 A JP-A-6-71947

  SUMMARY OF THE INVENTION An object of the present invention is to prevent image displacement that occurs cumulatively in an image forming apparatus that forms an image on a continuous recording medium for each of a plurality of lines.

The image processing apparatus according to claim 1 acquires image information for one page for transferring an image of a predetermined number of lines to a head that forms on the recording medium for each unit conveyance of the continuous recording medium. an acquiring unit, a transfer means for transferring the number of line image data of one page obtained by the obtaining means, by limiting the number times the number of lines natural number of lines in which the head is formed into the head, the Resolution conversion means for converting the resolution of the image information for one page acquired by the acquisition means into the resolution of the image formed by the head when the resolution of the image information is different from the resolution of the image formed by the head; The transfer means limits the number of lines of image information whose resolution is converted by the resolution conversion means to a number of lines that is a natural number times the number of lines formed by the head. To transfer to the head Te.

According to a second aspect of the present invention, acquisition means for acquiring image information for one page for transferring an image having a predetermined number of lines for each unit conveyance of a continuous recording medium to a head formed on the recording medium. And transfer means for limiting the number of lines of image information for one page acquired by the acquisition means to the number of lines that is a natural number multiple of the number of lines formed by the head, and transferring to the head, When the resolution of the image information transferred from the transfer unit is different from the resolution of the image formed by the head, the head sets the resolution of the image formed by the head to the resolution of the image information transferred by the transfer unit. Including head resolution conversion means for converting to

The invention according to claim 3 further comprises conversion means for converting image information for one page acquired by the acquisition means to a predetermined resolution in the invention according to claim 2 , wherein the transfer means The number of lines of image information whose resolution is converted by the conversion means is limited to the number of lines that is a natural number multiple of the number of lines formed by the head, and transferred to the head.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the transfer means has at least one of an image formation start side and an image formation end side of one page as a limiting line. Limit the lines that exist in the region.

According to a fifth aspect of the present invention, in the invention according to any one of the first to third aspects, the transfer means restricts an arbitrary line as a restricting line.

On the other hand, an image forming apparatus according to a sixth aspect includes a head for forming an image of a predetermined number of lines on the recording medium every time the continuous recording medium is conveyed, and a conveying unit that conveys the recording medium. Item 5. The image processing apparatus according to any one of Items 1 to 5 .

An image processing program according to a seventh aspect causes a computer to function as each unit of the image processing apparatus according to any one of the first to fifth aspects.

According to the first aspect of the present invention, even if the resolution of the image information and the resolution of the head are different, the image generated accumulatively in the image forming apparatus that forms an image for each of a plurality of lines on a continuous recording medium. There is an effect that the deviation can be prevented.

According to the second aspect of the present invention, the resolution of the image information is different from the resolution of the head, and even when resolution conversion is performed on the head side, accumulation is performed in the image forming apparatus that forms an image on a continuous recording medium for each of a plurality of lines. Thus, there is an effect that it is possible to prevent the image shift that occurs.

According to the third aspect of the present invention, the number of lines restricted when transferring image information to the head can be reduced as compared with a case where a configuration for converting to a predetermined resolution is not provided. There is.

According to the fourth aspect of the present invention, it is possible to reduce the influence on the image as compared with the case where the lines other than at least one line on the image forming start side and the image forming end side of one page are limited. effective.

According to the fifth aspect of the present invention, there is an effect that the influence on the image can be reduced as compared with the case where the lines other than the arbitrary line are limited.

According to the sixth aspect of the present invention, there is provided an image forming apparatus capable of preventing image deviation that is accumulated in an image forming apparatus that forms an image on a continuous recording medium for each of a plurality of lines. There is an effect that can be.

According to the seventh aspect of the present invention, there is provided an image processing program capable of preventing an image shift that accumulatively occurs in an image forming apparatus that forms an image on a continuous recording medium for each of a plurality of lines. There is an effect that can be.

1 is a diagram illustrating a schematic configuration of an image forming apparatus according to an exemplary embodiment. FIG. 3 is a block diagram illustrating a specific configuration of a control unit of the image forming apparatus according to the first embodiment. FIG. 6 is a diagram for explaining an example of processing performed by a control unit of the image forming apparatus according to the first embodiment. FIG. 10 is a block diagram illustrating a specific configuration of a control unit of an image forming apparatus according to a second embodiment. FIG. 10 is a diagram for explaining an example of processing performed by a control unit of an image forming apparatus according to a second embodiment. FIG. 10 is a diagram for describing an example of processing performed by a control unit of an image forming apparatus according to a third embodiment. It is a block diagram which shows the specific structure of the control part of the image forming apparatus which concerns on 4th Embodiment. It is a block diagram which shows the specific structure of the control part of the image forming apparatus which concerns on 5th Embodiment. FIG. 10 is a diagram for describing an example of processing performed by a control unit of an image forming apparatus according to a fifth embodiment. The figure for explaining the fraction which occurs when the resolution on the head side is not the same as the resolution of the image data or when the number of lines of the page length is not a natural number multiple of the number of multiple lines of the head. It is. If the resolution on the head side is the same as the resolution of the image data or is not a natural number multiple resolution, and if the number of lines in the page length does not become a natural number multiple of the number of multiple lines of the head, FIG.

  Hereinafter, the present embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of an image forming apparatus 10 according to the present embodiment.

  The image forming apparatus 10 according to the present embodiment forms an image using continuous paper (hereinafter referred to as continuous paper) as a recording medium.

  The continuous paper is stored in the storage unit 16, transported to a head 18 that performs image formation along a predetermined transport path, and is ejected from the image forming apparatus 10 after an image is formed by the head 18.

  In this embodiment, the head 18 includes a plurality of nozzles that eject ink, and forms an image by ejecting ink from the plurality of nozzles based on image information (hereinafter referred to as image data). Specifically, a plurality of nozzles are arranged in a plurality of lines along the width direction of the continuous paper, and an image in the width direction is formed by the nozzles of the plurality of lines. For example, an image may be formed using all five lines with a five-line nozzle array, or an image may be formed using some of the five lines (for example, four lines). You may do it.

  In the present embodiment, the case of an ink jet printer as an example of the image forming apparatus 10 will be described. However, the head 18 is not limited to this, and for example, an electrophotographic image forming apparatus is used to perform light exposure. May be applied.

  On the other hand, a tractor 24 provided with a plurality of pins to be inserted into holes provided in the continuous paper is provided in a conveyance path through which the continuous paper is conveyed, and the continuous paper is held and conveyed by the tractor 24. . The tractor 24 is driven by the motor 20. That is, when the motor 20 is driven, the tractor 24 moves, and the continuous paper held by the tractor 24 is conveyed. In the present embodiment, the conveyance control unit 12 controls the driving of the motor 20.

  The head 18 provided on the transport path forms an image while transporting continuous paper by ejecting ink from a plurality of nozzles onto the continuous paper for each predetermined unit transport of continuous paper. In the present embodiment, the head 18 forms an image in the main scanning direction (a direction orthogonal to the continuous paper transport direction), and the sub-scan is performed by transporting the continuous paper. The head 18 is controlled by the control unit 14. In the present embodiment, the control unit 14 buffers the image data for a plurality of lines in accordance with the conveyance speed, and then transfers the image data to the head 18 so that the ink in the sub-scanning direction (continuous paper conveyance direction) is transferred for each line. The output timing is controlled and controlled independently of the conveyance speed control.

  By the way, in an image forming apparatus that forms an image on a conventional continuous paper, an LED array is used as a head. Then, after inputting one line of image data, it outputs a signal for causing the LED array to emit light, exposes it according to the continuous paper conveyance speed, and arranges the image in the sub-scanning direction over the entire page. Thus, the image was formed.

  When a head used in a general-purpose inkjet printer or the like is used for such a continuous paper image forming apparatus as in the image forming apparatus 10 according to the present embodiment, the resolution on the head 18 side is the resolution of the image data. If the resolution is not the same as the resolution or a natural number multiple, and if the number of lines in the page length is not a natural number multiple of the number of multiple lines of the head, a fraction is generated and processing is impossible. In addition, since it is a continuous sheet, the fraction is accumulated and the image forming position is finally shifted.

  For example, as shown in FIG. 10, when the length corresponding to one page of continuous paper is 10 + 1/6 inch and the resolution of the image data is 240 dpi, the number of image lines is 2440 lines. When the resolution of the head 18 is 1600 × 1600 dpi and a 5-line head is used, the resolution is converted to 2440 lines × (1600 dpi / 240 dpi) ≈16266.66667, and a fraction of 1.666667 lines is generated. As a result, when image formation is performed after continuous paper, as shown in FIG. 11, fractions accumulate and image displacement (cumulative displacement) increases.

  In the present embodiment, the above-mentioned fraction is processed by using a head 18 used in a general-purpose inkjet printer or the like to prevent the cumulative deviation shown in FIG. In the following embodiments, specific examples of fraction processing will be described.

  In each of the following embodiments, the head 18 that ejects ink will be described as an example. However, as described above, the head 18 is not limited to one that ejects ink, and for example, a head that performs light exposure may be applied. May be.

(First embodiment)
FIG. 2 is a block diagram illustrating a specific configuration of the control unit 14 of the image forming apparatus according to the first embodiment.

  As shown in FIG. 2, the control unit 14 of the image forming apparatus 10 according to the present embodiment includes a buffer unit 28 and an in-page data transfer line number control unit 30.

  The buffer unit 28 sequentially receives and accumulates image data from the host controller 26, and outputs the accumulated image data in response to the read control signal output from the in-page data transfer line number control unit 30.

  The in-page data transfer line number control unit 30 controls the number of data lines to be transferred to the head 18 in the page. In this embodiment, the image data stored in the buffer unit 28 is acquired by outputting a read control signal to the buffer unit, and the image data is used for the number of lines in the array of the heads 18 (if there are unused lines). The number of lines of image data for one page is limited to the number of lines that is a natural number multiple of the number of lines used by the head 18 and is controlled to be output to the head 18. That is, the above-mentioned fraction is processed by limiting the image data to the number of lines that is a natural number times the number of lines of the head 18.

  The head 18 forms an image by ejecting ink from the nozzles based on the image data transferred from the in-page data transfer line number control unit 30.

  Next, specific processing performed by the control unit 14 of the image forming apparatus 10 according to the present embodiment will be described.

  FIG. 3 is a diagram for explaining an example of processing performed by the control unit 14 of the image forming apparatus 10 according to the first embodiment. In the following, a case where the resolution of the image data and the head 18 is 1600 × 1600 dpi will be described as an example.

  When the length in the sub-scanning direction corresponding to one page of continuous paper is 10 + 1/6 inch and the resolution of the image data is 1600 × 1600 dpi, the number of image lines is rounded down to 16266 lines.

  In this case, if the number of lines of the head 18 is 5, the 16266 lines cannot be divided by 5 lines, and therefore a fraction occurs.

  Therefore, when the in-page data transfer line number control unit 30 transfers the image data to the head 18, as shown in FIG. 3, the image data is transmitted by limiting the number of lines of the image data to a natural number multiple of 5 lines. To do. That is, image data of 16265 lines is transmitted, and transmission of one fractional line is limited. This eliminates fractions and eliminates the cumulative image shift.

(Second Embodiment)
FIG. 4 is a block diagram illustrating a specific configuration of the control unit of the image forming apparatus according to the second embodiment.

  As shown in FIG. 4, the image forming apparatus according to the present embodiment includes a control unit 15, a buffer unit 28, a resolution conversion unit 32, and an in-page data transfer line number control unit 30. That is, the resolution conversion unit 32 is provided for the first embodiment.

  The buffer unit 28 sequentially receives and accumulates image data from the host controller 26, and outputs the accumulated image data in accordance with the read control signal output from the resolution conversion unit 32.

  The resolution conversion unit 32 converts the resolution of the image data in accordance with the resolution of the head 18 and outputs it to the in-page data transfer line number control unit 30.

  The in-page data transfer line number control unit 30 controls the number of data lines to be transferred to the heads 18 in the page of the resolution-converted image data. In this embodiment, the resolution-converted image data is acquired, and the line of the image data of one page whose resolution is converted according to the number of lines of the head 18 (the number of lines to be used when there are unused lines). The number is controlled to be output to the head 18 by limiting the number of lines to a natural number multiple of the number of lines used by the head 18. That is, the above-mentioned fraction is processed by limiting the image data to the number of lines that is a natural number times the number of lines of the head 18.

  The head 18 forms an image by ejecting ink from the nozzles based on the image data transferred from the in-page data transfer line number control unit 30.

  Next, specific processing performed by the control unit 15 of the image forming apparatus according to the present embodiment will be described. FIG. 5 is a diagram for explaining an example of processing performed by the control unit 15 of the image forming apparatus according to the second embodiment. In the following, a case where the resolution of image data is 240 dpi and the resolution of the head 18 is 1600 × 1600 dpi will be described as an example.

  When the length in the sub-scanning direction corresponding to one page of continuous paper is 10 + 1/6 inch and the resolution of the image data is 240 dpi, the number of image lines is 2440 lines.

  When the resolution is converted by the resolution conversion unit 32, 2440 lines × (1600 dpi / 240 dpi) ≈16266.66667 lines, and a fraction is generated.

  Therefore, the intra-page data transfer line number control unit 30 transfers the image data to the head 18 by limiting the number of lines to 16265 lines, which is a natural number multiple of 5 lines of 16266.66667. As a result, even when resolution conversion is performed, there are no fractions and there is no cumulative image shift.

(Third embodiment)
In the second embodiment, the resolution conversion unit 32 is provided in the control unit 15 and the resolution conversion is performed on the control unit 15 side. However, in this embodiment, the resolution conversion is performed on the head 18 side. . That is, the resolution conversion unit 32 is omitted from the second embodiment, and resolution conversion is performed on the head 18 side.

  In the present embodiment, the control unit 15 specifically performs fraction processing as follows.

  FIG. 6 is a diagram for explaining an example of processing performed by the control unit of the image forming apparatus according to the third embodiment. In the following, a case where the resolution of image data is 240 dpi and the resolution of the head 18 is 1600 × 1600 dpi will be described as an example.

  When the length in the sub-scanning direction corresponding to one page of continuous paper is 10 + 1/6 inch and the resolution of the image data is 240 dpi, the number of image lines is 2440 lines.

  As shown in FIG. 6, it is assumed that the resolution of the head 18 is 1600 × 1600 dpi and the number of lines is 5 lines as described above. In this case, the in-page data transfer line number control unit 30 sets the transfer line number to an integer part of {2440 lines / (240 dpi / maximum common divisor between resolutions) / 5 lines} × (240 dpi / maximum between resolutions). (Common divisor) x 5 lines. That is, since the integer part of {2440 lines / (240 dpi / the greatest common divisor between resolutions) / 5 lines} is 162 × (240/80) × 5≈162.66666767, the number of transfer lines is 162 × ( 240/80) × 5 = 2430 lines. The in-page data transfer line number control unit 30 transfers data to the head 18 by limiting to 2430 lines. As a result, when resolution conversion is performed on the head 18 side, the number of data lines is 24030 × 1600/240 = 16200 lines, and there are no fractions and there is no cumulative image displacement.

  In the present embodiment, a resolution conversion unit 32 is further provided in the control unit 15 as in the second embodiment, and the image data is transmitted to the head 18 after being converted into a predetermined resolution (arbitrary resolution). Further conversion to the resolution of the head 18 may be performed on the head 18 side. At this time, by converting the resolution so that the number of lines to be limited is reduced as the predetermined resolution, the number of lines restricted when the fraction is processed is reduced.

(Fourth embodiment)
FIG. 7 is a block diagram illustrating a specific configuration of the control unit of the image forming apparatus according to the fourth embodiment.

  As shown in FIG. 7, the control unit 17 of the image forming apparatus according to the present embodiment includes a buffer unit 28, a data read / transfer control unit 34, an in-page line counter circuit 36, a transfer block line number setting unit 38, and a comparison unit. 40.

  The buffer unit 28 sequentially receives and accumulates the image data from the host controller 26, and outputs the accumulated image data in response to the read control signal output from the data read / transfer control unit 34.

  The in-page line counter circuit 36 counts the number of processed lines of one page or the number of processed lines, and outputs the count result to the comparison unit 40.

  The transfer block line number setting unit 38 sets the number of lines when blocking (restricting) transfer of lines existing in at least one area at the start and end of one page.

  Based on the count result of the in-page line counter circuit 36 and the number of lines set by the transfer block line number setting unit 38, the comparison unit 40 sets at least one set number of lines at the start and end of one page. An image transfer enable signal for restricting the transfer of the image is output to the data read / transfer control unit 34.

  The data read / transfer control unit 34 acquires one page of image data from the buffer unit 28 and transfers the image to the head 18 based on the image transfer enable signal.

  When the resolution of the image data and the head 18 is different, the head 18 performs resolution conversion, and forms an image by ejecting ink from the nozzles based on the resolution-converted image data.

  Next, specific processing performed by the control unit 17 of the image forming apparatus according to the present embodiment will be described. In the following, an example in which the resolution of image data is 240 dpi, the resolution of the head 18 is 1600 × 1600 dpi, and resolution conversion is performed on the head 18 side will be described.

  When the length in the sub-scanning direction corresponding to one page of continuous paper is 10 + 1/6 inch and the resolution of the image data is 240 dpi, the number of image lines is 2440 lines.

  In this case, since the resolution conversion is performed on the head 18 side, the number of transfer lines is 162 × (240 dpi / 80) × 5 = 2430 lines as described in the third embodiment.

  Here, the lines in the page are counted by the in-page line counter circuit 36, and the comparison unit 40 controls the image reading enable signal based on the number of lines set by the transfer block line number setting unit 38. To the unit 34.

  For example, 10 lines are set in the transfer block line number setting unit 38, and an image transfer enable signal at the start of one page is enabled and output to the data read / transfer control unit 34, and 2430 lines are transferred to the head 18. After the transfer of 2430 lines, the output of the image transfer enable signal is stopped and the transfer of the remaining 10 lines of one page is restricted. As a result, 2430 lines are transferred to the head 18. As in the third embodiment, resolution conversion is performed on the head 18 side, and the number of data lines is 24030 × 1600/240 = 16200 lines.

(Fifth embodiment)
FIG. 8 is a block diagram illustrating a specific configuration of the control unit of the image forming apparatus according to the fifth embodiment.

  In the present embodiment, as shown in FIG. 8, the image forming apparatus according to the fourth embodiment further includes a start block line number setting unit 39.

  In this embodiment, the start block line number setting unit 39 sets the number of lines when blocking (limiting) the transfer of lines existing in the area at the start of one page, and the transfer block line number setting unit 38 Sets the number of lines to block (limit) the transfer of lines existing in the area at the end of one page.

  Then, the comparison unit 42 starts and ends one page based on the count result of the in-page line counter circuit 36 and the setting results of the start block line number setting unit 39 and the transfer block line number setting unit 38. An image transfer enable signal for limiting the transfer of the image having the set number of lines is output to the data read / transfer control unit 34.

  Next, specific processing performed by the control unit 19 of the image forming apparatus according to the present embodiment will be described. FIG. 9 is a diagram for explaining an example of processing performed by the control unit 19 of the image forming apparatus according to the fifth embodiment. In the following, an example in which the resolution of image data is 240 dpi, the resolution of the head 18 is 1600 × 1600 dpi, and resolution conversion is performed on the head 18 side will be described.

  When the length in the sub-scanning direction corresponding to one page of continuous paper is 10 + 1/6 inch and the resolution of the image data is 240 dpi, the number of image lines is 2440 lines.

  In this case, since the resolution conversion is performed on the head 18 side, the number of transfer lines is 162 × (240 dpi / 80) × 5 = 2430 lines as described in the third embodiment.

  Here, the in-page line counter circuit 36 counts the lines in the page, and the comparison unit 42 enables the image transfer enable signal based on the number of lines set by the start block line number setting unit 39, The data is output to the data read / transfer controller 34.

  For example, (2440-5) lines are set in the start block line number setting unit 39, 5 lines are limited at the start of one page, 5 lines are set in the transfer block line number setting unit 38, and the area at the end is set. In the case of limiting the existing 5 lines, as shown in FIG. 9, transfer of 5 lines at the start of one page is limited, and then an image transfer enable signal is output to the data read transfer control unit 34 and 2430. The line is transferred to the head 18. After the transfer of 2430 lines, the output of the image transfer enable signal is stopped and the transfer of the remaining 5 lines of one page is restricted. As a result, 2430 lines are transferred to the head 18. As in the third embodiment, resolution conversion is performed on the head 18 side, and the number of data lines is 24030 × 1600/240 = 16200 lines.

  In the fifth embodiment, an example is described in which five lines existing in the image formation start side and end side regions of the page are described. However, 10 lines existing in the image formation start side or end region of the page are described. You may make it restrict | limit arbitrary lines like restricting at random like restricting.

  In the fourth and fifth embodiments, the example in which resolution conversion is performed on the head 18 side as in the third embodiment has been described. However, as in the second embodiment, resolution conversion is performed on the control unit 17 side. Alternatively, it may be converted to a predetermined resolution (arbitrary resolution) on the control unit 17 side, and further converted to the resolution of the head 18 on the head 18 side.

  Also, the fraction processing and resolution conversion processing performed by the control units 14, 15, 17, 19 and the head 18 in the above embodiment may be stored in a storage medium as a program and distributed. Good.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 12 Conveyance control part 14, 15, 17, 19 Control part 18 Head 20 Motor 28 Buffer part 30 In-page data transfer line number control part 32 Resolution conversion part 34 Data read-out transfer control part 36 In-page line counter circuit 38 Transfer block line number setting unit 39 Start block line number setting unit 40, 42 Comparison unit

Claims (7)

Obtaining means for obtaining image information for one page for transferring an image having a predetermined number of lines for each unit conveyance of a continuous recording medium to a head formed on the recording medium;
Transfer means for limiting the number of lines of image information for one page acquired by the acquisition means to the number of lines that is a natural number multiple of the number of lines formed by the head, and transferring to the head;
Resolution conversion means for converting the resolution of the image information for one page acquired by the acquisition means into the resolution of the image formed by the head when the resolution of the image information is different from the resolution of the image formed by the head. When,
With
An image processing apparatus in which the transfer unit transfers the number of lines of image information whose resolution has been converted by the resolution conversion unit to the head while limiting the number of lines to a natural number multiple of the number of lines formed by the head . Obtaining means for obtaining image information for one page for transferring an image having a predetermined number of lines for each unit conveyance of a continuous recording medium to a head formed on the recording medium;
Transfer means for limiting the number of lines of image information for one page acquired by the acquisition means to the number of lines that is a natural number multiple of the number of lines formed by the head, and transferring to the head;
With
When the resolution of the image information transferred from the transfer unit is different from the resolution of the image formed by the head, the head sets the resolution of the image formed by the head to the resolution of the image information transferred by the transfer unit. An image processing apparatus including a head resolution conversion means for converting the image into a head . The image processing apparatus further includes conversion means for converting the image information for one page acquired by the acquisition means into a predetermined resolution, and the transfer means determines the number of lines of image information whose resolution is converted by the conversion means by the head. The image processing apparatus according to claim 2 , wherein the number of lines is limited to a natural number times the number of lines to be formed and transferred to the head . 4. The image processing apparatus according to claim 1, wherein the transfer unit restricts a line existing in at least one region on an image formation start side and an image formation end side of one page as a restricted line. 5. . It said transfer means, an image processing apparatus according to any one of claim 1 to 3 for limiting any line as a line to be limiting. A head for forming an image of a predetermined number of lines on the recording medium for each continuous conveyance of the recording medium;
  Conveying means for conveying the recording medium;
  The image processing apparatus according to any one of claims 1 to 5,
  An image forming apparatus.   An image processing program for causing a computer to function as each unit of the image processing apparatus according to claim 1.

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