WO2022107870A1 - 吐出位置データの生成方法、吐出位置データ生成装置、及びプログラム - Google Patents
吐出位置データの生成方法、吐出位置データ生成装置、及びプログラム Download PDFInfo
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- WO2022107870A1 WO2022107870A1 PCT/JP2021/042515 JP2021042515W WO2022107870A1 WO 2022107870 A1 WO2022107870 A1 WO 2022107870A1 JP 2021042515 W JP2021042515 W JP 2021042515W WO 2022107870 A1 WO2022107870 A1 WO 2022107870A1
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- 238000000034 method Methods 0.000 title claims abstract description 188
- 238000012937 correction Methods 0.000 claims abstract description 153
- 238000003708 edge detection Methods 0.000 claims abstract description 72
- 238000012545 processing Methods 0.000 claims description 214
- 239000000976 ink Substances 0.000 claims description 135
- 239000003086 colorant Substances 0.000 claims description 27
- 238000000926 separation method Methods 0.000 claims description 21
- 238000010586 diagram Methods 0.000 description 15
- 238000013139 quantization Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
- B41J2/2139—Compensation for malfunctioning nozzles creating dot place or dot size errors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/409—Edge or detail enhancement; Noise or error suppression
- H04N1/4092—Edge or detail enhancement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/21—Ink jet for multi-colour printing
- B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/002—Interacting with the operator
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- G—PHYSICS
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- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/10—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by matrix printers
- G06K15/102—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by matrix printers using ink jet print heads
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/18—Conditioning data for presenting it to the physical printing elements
- G06K15/1848—Generation of the printable image
- G06K15/1856—Generation of the printable image characterized by its workflow
- G06K15/186—Generation of the printable image characterized by its workflow taking account of feedback from an output condition, e.g. available inks, time constraints
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/18—Conditioning data for presenting it to the physical printing elements
- G06K15/1867—Post-processing of the composed and rasterized print image
- G06K15/1869—Depleting the print image
- G06K15/1871—Depleting the print image with provisions for image features conservation or enhancement, e.g. conservation or enhancement of zone edges
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- G—PHYSICS
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- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/18—Conditioning data for presenting it to the physical printing elements
- G06K15/1867—Post-processing of the composed and rasterized print image
- G06K15/1872—Image enhancement
- G06K15/1878—Adjusting colours
- G06K15/188—Adjusting colours with provisions for treating some of the print data differently
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
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- G—PHYSICS
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- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/13—Edge detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/58—Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction
Definitions
- the present invention relates to a discharge position data generation method, a discharge position data generation device, and a program.
- an inkjet printer which is a printing device that prints by an inkjet method
- the printing apparatus ejects ink based on data generated by, for example, a RIP (Raster Image Processor) process (see, for example, Patent Document 1).
- the inkjet printer executes printing on the medium to be printed by ejecting ink from the inkjet head to the ejection position set according to the printing resolution based on this data.
- the RIP process data indicating the ejection position for ejecting ink from the inkjet printer is generated.
- the ink ejected from the inkjet head to the medium usually spreads on the surface of the medium after landing on the medium. Further, in this case, the size of the ink spread on the medium is wider than the range corresponding to one ejection position determined according to the print resolution in consideration of filling the medium as necessary. It is conceivable to set so that a dot gain that spreads the ink dots is generated.
- an object of the present invention is to provide a discharge position data generation method, a discharge position data generation device, and a program that can solve the above problems.
- the inventor of the present application has considered performing image processing for correcting edges on an image printed by a printing device. Further, more specifically, as this image processing, it was considered to change at least a part of the ejection position where the ink is ejected from the inkjet head to draw an edge, for example, to a position where the ink is not ejected. With this configuration, the appearance of edges in the print result can be appropriately changed. Further, for example, it is possible to appropriately prevent the line from being output thicker than the original intention at the portion where the thin line is drawn, and the portion where the drawn character is drawn from being filled.
- the present invention is a method for generating ejection position data, which is data indicating an ejection position for ejecting ink from an inkjet head in a printing apparatus, and is a method for generating ejection position data in the printing apparatus.
- the image processing is performed on an edge detection process for detecting an edge on at least a part of the image and an image process for correcting the edge detected by the edge detection process.
- the edge correction process for Data indicating the image composed of associated pixels, and as the pixel value of each pixel, a non-ejection value, which is a value indicating that ink is not ejected to the corresponding ejection position, or the non-ejection value.
- a discharge value other than the above is set, and in the edge detection process, the position where the pixel for which the non-discharge value is set and the pixel for which the discharge value is set are adjacent to each other is detected.
- edge correction can be performed appropriately.
- this makes it possible to appropriately improve the quality of printing performed in the printing apparatus.
- by correcting the edge for example, the line is output thicker than the original intention at the place where a thin line is drawn, or the line is drawn at a place where a blank character is drawn. It is possible to appropriately prevent the removed part from being painted.
- the operation of correcting the edge can be considered as an operation of adjusting the pixels indicating the printed image.
- the edge correction process it is conceivable to set the pixel value of the pixel within the range of a predetermined width from the edge to the non-ejection value. More specifically, in this case, in the edge correction process, the pixel value of the pixel whose ejection value is set as the pixel value within the range of a predetermined number of pixels from the boundary of the edge to be corrected is the non-ejection value. It is conceivable to perform image processing to change to. With this configuration, for example, the influence of dot gain can be appropriately suppressed and the edge can be sharpened.
- edge correction process for example, it is preferable to correct the edge so that the line disappears due to the correction. More specifically, in the edge correction process, among the edges detected by the edge detection process, the edge generated corresponding to the line having a preset line width or less is prevented from disappearing by the edge correction. , It is conceivable to perform image processing on the image. With this configuration, edge correction can be performed more appropriately.
- the printing device it is conceivable to use a color printer that performs color printing using inks of a plurality of colors as the printing device. Further, in this case, it is conceivable to further perform an image acquisition process, a plate separation process, and the like in the operation of generating the ejection position data.
- the image acquisition process can be considered as a process of acquiring color image data which is data indicating a color image to be printed by a printing apparatus.
- the plate separation process can be considered as a process of generating a grayscale image corresponding to each color of the plurality of colors of ink used in the printing apparatus.
- a gray scale image corresponding to each color is generated by separating a color image according to each color of the inks of a plurality of colors. Further, in this case, it is conceivable to use data showing a grayscale image corresponding to each color as the data to be processed. With this configuration, edge correction can be appropriately performed for each color of ink used in the printing apparatus. In addition, this makes it possible to more appropriately improve the quality of the printed image.
- the edge detection processing and the edge correction processing it is conceivable to detect and correct the edge of the entire image indicated by the processing target data. Further, in the edge detection process and the edge correction process, it is conceivable to detect or correct the edge only for a part of the image indicated by the data to be processed.
- the processing target data it is conceivable to use the processing target data in a format in which a part of the image can be selected. More specifically, in this case, it is conceivable to use data in a format that can be selected as an object that distinguishes a part of the image from other parts as the data to be processed.
- the edge detection process detects an edge in a preselected object. Further, in the edge correction process, the edge is corrected for the edge detected in this object. With this configuration, edge correction can be performed more appropriately according to the user's intention. Further, in this case, it is conceivable to select an object corresponding to a part where it is important to express a thin line, such as a place where a character is expressed, and detect or correct an edge.
- auxiliary image which is an image composed of pixels in which the auxiliary value used for selecting the object is set.
- auxiliary data indicating an auxiliary image in which an auxiliary value, which is a target value different from the value set for expressing the color, is set for each pixel is used.
- the portion composed of the pixels corresponding to the pixels for which the predetermined auxiliary value is set in the auxiliary image is treated as the object to be detected, and the edge in the object is treated. Can be detected. With this configuration, objects can be selected easily and appropriately.
- the auxiliary data can be considered as data indicating an image in which the auxiliary value is set in the pixel. Further, as such auxiliary data, it is conceivable to use a channel (alpha channel or the like) prepared separately from the color channel in the data showing a color image using a plurality of color channels corresponding to a plurality of colors.
- the object for example, it is conceivable to select the object according to the instruction of the user who receives it using an input device such as a mouse. In this case, it is conceivable to further perform a range selection process for receiving an instruction to select a part of the range in the image from the user. Then, in the edge detection process, among the pixels of the image indicated by the processing target data, the portion composed of the pixels in the range selected by the user in the range selection process is an object that distinguishes it from the other parts in the image. And detect the edge in the object. Even in this configuration, the objects can be easily and appropriately selected.
- the feature of the present invention can be considered by paying attention to performing edge detection processing and edge correction processing using a grayscale image generated by the plate separation processing. Further, in this case, regarding the operation of the edge correction process, the edge is set so that the amount of ink ejected to at least a part of the ejection position where the ink is ejected from the inkjet head in order to draw the edge detected by the edge detection process is reduced. It can also be considered as an operation of performing image processing for correction. Further, as the configuration of the present invention, it is conceivable to use a discharge position data generation device, a program, or the like having the same characteristics as described above. In these cases as well, the same effects as described above can be obtained.
- the quality of printing performed in the printing apparatus can be appropriately improved.
- FIG. 1A shows an example of the configuration of the printing system 10.
- FIG. 1B shows an example of the configuration of the print execution unit 12 in the print system 10.
- FIGS. 3A and 3B show examples of data showing thin lines and output results.
- FIGS. 3 (c) and 3 (d) show examples of data showing thin blank characters and output results.
- FIGS. 4A and 4B show examples of data showing thin lines and output results.
- FIG. 4 (c) and 4 (d) show examples of data showing thin blank characters and output results. It is a figure explaining the operation of the edge correction performed in this example.
- FIG. 5A is a diagram illustrating an operation in the edge detection process.
- FIG. 5B shows an example of an output result when printing is performed without performing edge correction.
- FIG. 5C shows an example of the operation of the edge correction process.
- FIG. 5D shows an example of a print output result when edge correction is performed. It is a figure which shows the example of the edge correction.
- 6 (a) to 6 (d) show an example of edge correction for lines of various widths. It is a figure explaining the modification of the edge correction processing.
- 7 (a) and 7 (b) show an example of the range in which the pixel value is changed in the modification of the edge correction process. It is a figure explaining the effect of edge correction processing.
- FIG. 1 shows an example of the configuration of the printing system 10 according to the embodiment of the present invention.
- FIG. 1A shows an example of the configuration of the printing system 10.
- FIG. 1B shows an example of the configuration of the print execution unit 12 in the print system 10. Except as described below, the printing system 10 of this example may have the same or similar characteristics as a known printing system.
- the printing system 10 is a system that prints on the medium (media) 50 to be printed by an inkjet method, and includes a print execution unit 12 and a RIP processing unit 14.
- the print execution unit 12 is an example of a printing device, and is a unit that executes a printing operation of ejecting ink to the medium 50.
- the print execution unit 12 can be considered as a main body portion of an inkjet printer or the like.
- the print execution unit 12 receives the RIP generation data, which is an example of the ejection position data, from the RIP processing unit 14, and ejects the ink according to the RIP generation data to execute the printing operation on the medium 50. do.
- the ejection position data can be considered as data indicating the ejection position for ejecting ink from the inkjet head in the printing apparatus.
- the RIP generated data can be considered as data generated by performing RIP (Raster Image Processor) processing.
- the print execution unit 12 is a color printer that performs color printing using inks of a plurality of colors different from each other, and has a plurality of inkjet heads 102, a platen 104, a main scan drive unit 106, and a sub-scan drive. It has a unit 108 and a control unit 110.
- Each of the plurality of inkjet heads 102 is an ejection head that ejects ink by an inkjet method, and ejects ink of each color used for printing. In this case, it is conceivable that each of the plurality of inkjet heads 102 ejects inks of different colors from each other.
- each of the plurality of inkjet heads 102 ejects ink of each color of the process color, which is the basic color in color printing.
- the ink of each color of the process color for example, it is conceivable to use inks of yellow color (Y color), magenta color (M color), cyan color (C color), and black color (K color).
- each inkjet head 102 has a nozzle row in which a plurality of nozzles are arranged in a predetermined nozzle row direction, and ink is ejected from each nozzle in the nozzle row.
- the nozzle row direction is a direction parallel to the sub-scanning direction (X direction in the drawing) preset in the print execution unit 12.
- the plurality of nozzles are arranged in the nozzle row direction so that the positions in the sub-scanning direction are shifted from each other.
- each of the plurality of inkjet heads 102 is an inkjet head that ejects only one type of capacity droplet (ink droplet).
- the design capacity of the droplet of ink ejected from each nozzle of the inkjet head is one type.
- the ejection of only droplets having one type of capacity it can be considered that the ejection of ink from each nozzle is controlled in two types of states of whether or not to eject ink.
- the capacity of the droplets ejected from each nozzle of the inkjet head is such that the ink dots spread over a wider range than the range of one dot determined according to the printing resolution.
- the inkjet head that ejects droplets having a plurality of types of capacities can be considered as a multi-valued head or the like in which the capacities of the droplets can be set in a plurality of stages.
- the platen 104 is a trapezoidal member on which the medium 50 is placed on the upper surface, and holds the medium 50 in a state of facing the plurality of inkjet heads 102.
- the main scanning drive unit 106 is a driving unit that causes a plurality of inkjet heads 102 to perform a main scanning operation.
- the main scanning operation can be considered as an operation of ejecting ink while moving relative to the medium 50 in a preset main scanning direction.
- the main scanning direction is a direction orthogonal to the sub-scanning direction (Y direction in the figure).
- the main scanning drive unit 106 applies ink to each nozzle of each of the plurality of inkjet heads 102 with respect to the ejection position set according to the print resolution according to the control of the control unit 110. Discharge. In this case, regarding ejecting ink to the inkjet head 102 with respect to the ejection position, the ink is ejected to the ejection position specified by the RIP generation data among the ejection positions set according to the printing resolution. Can be thought of.
- the sub-scanning drive unit 108 is a driving unit that causes a plurality of inkjet heads 102 to perform a sub-scanning operation.
- the sub-scanning operation can be considered as an operation of moving in the sub-scanning direction relative to the medium 50. Further, the sub-scanning operation can be considered as an operation of feeding the medium 50 relatively in the sub-scanning direction to the plurality of inkjet heads 102 between the main scanning operations.
- the control unit 110 is, for example, a part of the print execution unit 12 including a CPU and the like, and controls the operation of each part of the print execution unit 12.
- the control unit 110 controls the operation of each unit of the print execution unit 12 based on the RIP generation data received from the RIP processing unit 14. Further, as a result, the control unit 110 causes the print execution unit 12 to execute the printing operation.
- the RIP processing unit 14 is an example of a ejection data generation unit, and generates RIP generation data by performing RIP processing based on input data indicating an image to be printed by the print execution unit 12. Then, the RIP processing unit 14 controls the operation of the print execution unit 12 by supplying the generated RIP generation data to the print execution unit 12. In this case, the RIP processing unit 14 generates RIP generation data by performing RIP processing according to, for example, the configuration of the print execution unit 12 or the setting of the printing operation executed by the print execution unit 12. More specifically, in this example, the RIP processing unit 14 generates, as RIP generation data, data indicating at least the positions where the ink should be ejected at a plurality of ejection positions set according to the print resolution.
- the RIP processing unit 14 for example, a computer or the like that executes a program (software) for RIP processing can be preferably used. Further, the RIP processing unit 14 can be considered as, for example, a computer that controls the operation of the print execution unit 12. The operation of generating RIP generated data in the RIP processing unit 14 will be described in more detail below.
- FIG. 2 is a flowchart showing an example of an operation of generating RIP generated data in the RIP processing unit 14.
- the RIP processing unit 14 first acquires input data indicating an image (printed image) to be printed by the print execution unit 12 (S102).
- the operation performed in step S102 is an example of the operation of the image acquisition process.
- the RIP processing unit 14 acquires color image data, which is data indicating a color image to be printed by the print execution unit 12, as input data.
- the process of acquiring the color image data in step S102 can be performed in the same manner as or in the same manner as the operation performed in the known RIP process.
- the RIP processing unit 14 converts the resolution of the color image data acquired in step S102 according to the resolution of printing executed by the print execution unit 12 (S104).
- the print execution unit 12 ejects ink from the inkjet head to eject the pixels (pixels, pixels) constituting the image indicated by the converted color image data. It can be associated with a position.
- the resolution conversion process performed in step S104 can be performed in the same manner as or in the same manner as the operation performed in the known RIP process.
- the RIP processing unit 14 performs the plate separation process (S106).
- the plate separation process can be considered as a process of separating a color image showing an image to be printed by the print execution unit 12 according to the color of the ink used for printing. Further, the plate separation process can be considered as a process of generating a grayscale image corresponding to each color of the plurality of colors of ink used in the print execution unit 12.
- the RIP processing unit 14 separates the color image whose resolution has been converted in step S104 according to each color of the plurality of colors of ink used at the time of printing in the print execution unit 12. Generates a grayscale image corresponding to each color. More specifically, in this example, the RIP processing unit 14 generates a grayscale image corresponding to each color of YMCK.
- the plate separation process can also be performed in the same manner as or in the same manner as the operation performed by the known RIP process.
- the data showing the grayscale image generated in step S106 corresponding to each color of ink is an example of the processing target data.
- the data to be processed can be considered as the data to be processed in the subsequent step S108.
- the processing target data can also be considered as image data indicating an image to be printed by the print execution unit 12.
- the data showing each gray scale image corresponding to the ink of each color can be considered as the gradation image data showing the image printed with the ink of the corresponding color with a predetermined gradation.
- the gray scale image can be considered as an image represented by three or more gradations. More specifically, in this example, the RIP processing unit 14 generates a grayscale image having a gradation of about 8 bits (for example, 4 to 16 bits) corresponding to each color of ink.
- the RIP processing unit 14 detects and corrects an edge in the image (S108).
- the edge can be considered, for example, a boundary portion between the object and the background represented in the image, a continuous boundary portion in the contour of the object, a series of pixels constituting the contour of the object, and the like.
- the RIP processing unit 14 executes the edge detection process (S202) and the edge correction process (S204) as the operation in step S108.
- the RIP processing unit 14 performs a process of detecting an edge on at least a part of the image based on the data indicating the grayscale image generated in step S106.
- the RIP processing unit 14 performs image processing for correcting the edge detected in step S202 on the image shown by the grayscale image. The operation of edge detection and correction performed in steps S202 and S204 will be described in more detail later.
- the RIP processing unit 14 generates RIP generation data (S110).
- the RIP processing unit 14 generates RIP generation data based on the grayscale image in which the edge is corrected in step S204 in step S108, thereby reflecting the result of the image processing in the edge correction processing.
- Generate RIP generation data can be performed in the same manner as or in the same manner as the operation performed by the known RIP process, except that the grayscale image with the edge corrected is used.
- the RIP processing unit 14 performs a quantization process (S212) and a command conversion process (S214) as operations in step S110.
- the RIP processing unit 14 performs a quantization process for reducing the number of gradations on each grayscale image corresponding to the ink of each color.
- the quantization process can be considered as an operation of reducing the gradation to the number of gradations that can be expressed by the capacity of the droplets (ink droplets) that can be ejected by the inkjet head.
- the quantization process can be considered as a halftone process or the like performed according to the configuration of the inkjet head.
- the inkjet head in the print execution unit 12 of this example is an inkjet head that ejects only droplets having one type of capacity.
- the quantization process can be considered as a process of binarizing an image.
- the RIP processing unit 14 converts a grayscale image into a binary bitmap image by performing a quantization process.
- ink is ejected from the inkjet head among the ejection positions set according to the printing resolution. It can be thought of as indicating a position. Further, the other value can be considered to indicate a position where ink is not ejected.
- the binary bitmap image can be considered as an image showing a position where ink is ejected from the inkjet head.
- the quantization process can be considered as a process of reducing the number of gradations of an image to the number of gradations according to the type of droplet capacitance. Further, in this case, it is conceivable to perform a process of binarizing the image for each volume of the droplet.
- step S214 the RIP processing unit 14 commands the data showing the binary bitmap image generated by the quantization process in step S212.
- the command conversion can be considered as a process of converting data into data in a format that can be processed by the print execution unit 12.
- the RIP processing unit 14 generates RIP generation data based on the data showing the binary bitmap image generated by the quantization process by this commanding.
- RIP generation data can be appropriately generated based on the input data indicating the image to be printed by the print execution unit 12. Further, in this case, the RIP generated data can be considered as data indicating a position where ink is ejected from the inkjet head among the ejection positions set according to the printing resolution. Further, as described above, according to this example, in the process of generating RIP generated data, the process of correcting the edge can be appropriately performed. Further, in this example, the RIP processing unit 14 controls the operation of the print execution unit 12 by supplying the RIP generation data to the print execution unit 12. Therefore, according to this example, the print execution unit 12 can appropriately execute the printing operation reflecting the result of correcting the edge.
- the operation other than the operation in step S108 can be performed in the same manner as or in the same manner as the operation performed in the known RIP process.
- the RIP processing unit 14 may further perform the same or similar operations as those performed in the known RIP processing. For example, when the print execution unit 12 prints by the multipath method, it is conceivable that the RIP processing unit 14 performs a process of dividing data according to the operation of the multipath method.
- FIG. 3 is a diagram illustrating the reason for correcting the edge, and shows an example of a problem that occurs when the edge is not corrected.
- FIGS. 3A and 3B are diagrams showing examples of data and output results showing thin lines (lines), and are for thin lines having a width of 2 pixels in the vertical direction and a length of 10 pixels in the horizontal direction.
- FIGS. 3 (c) and 3 (d) are diagrams showing examples of data and output results showing thin blank characters, and the characters "" have a width of 1 pixel in the vertical direction and a length of 11 pixels in the horizontal direction.
- drawing "-" an image on the data and an example of the output result by the print execution unit 12 are shown.
- the image on the data can be considered as, for example, an image represented by the RIP generated data.
- the output result of the print execution unit 12 can be considered as a line drawn on the medium by the dots of the ink ejected from the inkjet head.
- the capacity of the ink droplets ejected from each nozzle of the inkjet head is in a range wider than the range of one dot determined by the printing resolution.
- the capacity is such that the dots spread. More specifically, for example, when the print resolution is 600 dpi, the width of one pixel is about 42 ⁇ m. On the other hand, in this example, the width of the range in which one dot spreads is larger than 42 ⁇ m. In this case, the width of the range in which one dot spreads can be considered as the width corresponding to the diameter when the shape of the ink dots is approximated by a circle. More specifically, in this example, the width of the range in which one dot spreads is about 50 to 90 ⁇ m.
- the ink dots formed at the positions of the respective pixels are formed in a state where a part of them protrudes to the positions of the adjacent pixels.
- the state of the output result may be significantly different from the desired state corresponding to the image on the data. More specifically, for example, when trying to draw a thin line as shown in FIGS. 3 (a) and 3 (b), a line thicker than the intended state (original state) is drawn due to the protrusion of the dots. Or, it is possible that the color becomes darker due to the effect of overlapping dots. Further, for example, when trying to draw a blank character as shown in FIGS.
- the dot may protrude from the nearby pixel with respect to the portion where the ink dot is not formed in order to express the blank character. Conceivable. Further, as a result, for example, it is conceivable that even a portion that should be an omitted character is filled and the character becomes unreadable.
- FIG. 4 is a diagram showing an example of edge correction performed in this example.
- 4 (a) and 4 (b) are diagrams showing examples of data and output results showing thin lines (lines), and when drawing the same thin lines as those shown in FIGS. 3 (a) and 3 (b).
- An example of an image on the data and an output result of the print execution unit 12 is shown.
- 4 (c) and 4 (d) show an image on the data and an output result of the print execution unit 12 in the case of drawing the same blank characters as shown in FIGS. 3 (c) and 3 (d). An example is shown. Further, FIGS.
- FIGS. 4A and 4C show an image corresponding to the state before the correction in order to show a desired image to be drawn.
- the images shown in FIGS. 4A and 4C are the same as the images shown in FIGS. 3A and 3C.
- FIGS. 4 (b) and 4 (d) the dots of the ink actually formed are shown by the solid circles, and the dots of the ink that are not formed by the correction are shown by the broken lines, so that the correction result is shown. Shown. More specifically, in FIGS. 4 (b) and 4 (d), the broken line circle is actually formed in the state of FIGS. 3 (b) and 3 (d), and is shown in FIGS. 4 (b) and 4 (d). It shows the dots of ink that are not formed in the state.
- FIG. 5 is a diagram illustrating an operation of edge correction performed in this example.
- FIG. 5A is a diagram illustrating an operation in an edge detection process performed before the edge correction process.
- the RIP processing unit 14 performs a process of detecting an edge on at least a part of the image based on the data indicating the grayscale image generated by the plate separation process.
- the data showing the gray scale image can be considered as the data showing the image composed of the pixels associated with the ink ejection position in the print execution unit 12.
- one of the gradation values of the gray scale image is a non-ejection value which is a value indicating that the ink is not ejected to the corresponding ejection position.
- the other values are discharge values that are values other than the non-discharge values. More specifically, in this case, it is conceivable to use either the maximum or the minimum of the gradation values of the grayscale image as the non-ejection value. Further, among the gradation values, all values (plurality of values) other than the non-ejection value may be used as the ejection value.
- the RIP processing unit 14 detects the edge by detecting the position where the pixel for which the non-ejection value is set and the pixel for which the ejection value is set are adjacent to each other. In this case, the RIP processing unit 14 sequentially selects pixels for each grayscale image corresponding to the ink of each color used in the print execution unit 12, and confirms the pixel values of the pixels and the surrounding pixel values. By doing so, the edge is detected.
- the RIP processing unit 14 performs a quantization process on the grayscale image corresponding to the ink of each color, and the position where the ink is ejected from the inkjet head. Generates a binary bitmap image showing. Then, in this case, the pixel value of the binary bitmap image corresponding to the pixel for which the ejection value is set in the gray scale image may be a value indicating a position where ink is not ejected. Therefore, the ejection value and non-ejection value in the grayscale image do not completely correspond to whether or not the ink is ejected at the time of actual printing, but should be considered as a value indicating the state at the time of the grayscale image. Can be done.
- each square shows one pixel 202 corresponding to one ejection position set according to the print resolution.
- the pixel 202 indicated by the shaded grid is a pixel in which the ejection value is set.
- the pixels shown by the squares without the shaded pattern are the pixels for which the non-ejection value is set.
- the thick line in the figure indicates the edge detected in the illustrated case. According to this example, edge detection can be appropriately performed.
- FIG. 5A shows an image in a state where the edge is not corrected. Then, in this case, when the RIP generation data is generated without performing edge correction and printing is executed by the print execution unit 12, as shown in FIG. 5B, the pixels 202 in which the ink dots are adjacent to each other are printed. The print quality may deteriorate due to the protrusion to the position.
- FIG. 5B shows an example of an output result when printing is performed without performing edge correction.
- FIG. 5C shows an example of the operation of the edge correction process.
- the RIP processing unit 14 changes the pixel value of the corresponding pixel 202 to a non-ejection value for at least a part of the ejection position where ink is ejected from the inkjet head in order to draw an edge detected by the edge detection process. By doing so, image processing for correcting edges is performed.
- this pixel value can be considered as the pixel value of the pixel 202 associated with the ejection position in the grayscale image.
- the RIP processing unit 14 corrects the edge by changing the pixel value of the pixel adjacent to the edge detected by the edge detection process to a non-ejection value. I do.
- the RIP processing unit 14 generates RIP generation data based on the corrected grayscale image. Then, in this case, the output result of printing executed by the print execution unit 12 is as shown in FIG. 5 (d).
- FIG. 5D shows an example of a print output result when edge correction is performed. As can be understood from the figure, according to this example, it is possible to appropriately prevent the ink dots from spreading outside the position of the edge shown in FIG. 5 (a). Further, this makes it possible to appropriately suppress the influence of the dot gain and sharpen the edge.
- the print execution unit 12 sets the data indicating the grayscale image generated corresponding to the ink of each color in the plate separation process as the data to be processed in the edge detection process and the edge correction process. Edge correction can be appropriately performed for each color of ink used. In addition, this makes it possible to more appropriately improve the quality of the printed image.
- the ink dot size in the output result is illustrated in consideration of making it easier to see the relationship with the position of the pixel 202 rather than reflecting the actual size. There is. Therefore, with respect to FIG. 5D, the state after correction may not always look better than that before correction. However, in the actual output result, by correcting the edge as described above, it becomes possible to print in a state closer to the state indicated by the data before the correction.
- the operation of edge correction performed in this example can be considered as an operation of omitting ink dots for one pixel around the edge. Further, the operation of correcting the edge can be considered as an operation of retreating the position of the edge. Further, the operation of correcting the edge in this example can be considered as an operation of adjusting the pixels indicating the printed image. Further, the operation of the edge correction processing performed in this example can be considered as an example of an operation of setting the pixel value of a pixel within a range of a predetermined width from the edge to a non-ejection value.
- the operation of the RIP processing unit 14 in the edge correction processing does not exclude the pixel value of the pixel whose ejection value is set as the pixel value within the range of a predetermined number of pixels from the boundary of the edge to be corrected. It can also be considered as an operation of performing image processing for changing to a discharge value.
- the RIP processing unit 14 further detects the width of the region to be corrected and corrects the edge according to the width so that the line disappears due to the correction. Correct the edges. Further, more specifically, in the edge correction processing, the RIP processing unit 14 corrects the edges of the edges detected in the edge detection processing, which are generated corresponding to the lines having a line width or less set in advance. Image processing is performed on the grayscale image so that the line does not disappear. With this configuration, edge correction can be performed more appropriately. Examples of edge correction for lines of various widths will be described in more detail below.
- FIG. 6 shows an example of edge correction. 6 (a) to 6 (d) show an example of edge correction for lines of various widths.
- FIGS. 6A to 6D the figure on the left shows some pixels of the grayscale image before the edge correction processing is performed.
- the figure on the right shows some pixels in a grayscale image after edge correction.
- the thick solid line indicates the position of the edge detected by edge detection.
- the thick dashed line is drawn at the same position as the thick solid line in the figure on the right.
- FIG. 6A is a diagram showing an example of edge correction performed on a wide line having a width of 5 pixels.
- the RIP processing unit 14 changes the pixel value to the non-ejection value for the region for one pixel along the edge by the operation of the edge correction processing described above. Therefore, the line after the edge correction processing is reduced in one pixel on one side and one pixel on the other side in the width of five pixels, and becomes a line having a width of three pixels as shown in the figure on the right side. Become. Further, in this case, one pixel at the tip is reduced also in the length direction of the line.
- FIG. 6B is a diagram showing an example of edge correction performed on a line having a width of three pixels.
- the RIP processing unit 14 changes the pixel value to the non-ejection value for the region for one pixel along the edge. Therefore, the line after the edge correction processing is reduced in one pixel on one side and one pixel on the other side in the width of three pixels, and becomes a line having a width of one pixel as shown in the figure on the right side. Become. Also in this case, one pixel at the tip is reduced in the length direction of the line.
- the RIP processing unit 14 reduces the width of a line having a wider width or a region having a wider width by correcting the edge in the same manner as described above.
- the same edge correction as described above is performed on a line having a narrower width, it is conceivable that the line disappears due to the correction. More specifically, for example, when edge correction processing is performed on a line having a width of 2 pixels or less in the same manner as in the cases shown in FIGS. By changing to a non-discharge value, the line disappears.
- the RIP processing unit 14 prevents the edges generated corresponding to the lines having a preset line width or less from disappearing due to the edge correction.
- image processing is performed on the grayscale image.
- the image processing is performed so that the lines do not disappear, such that the image processing is performed so that at least one pixel remains in the width direction.
- the remaining pixels it can be considered that the pixels whose pixel values are the ejection values remain. More specifically, in this example, as shown in FIGS. 6 (c) and 6 (d), the operation of the edge correction processing performed on a line or region having a width of 2 pixels or less is for 3 pixels. It is different from the operation of edge correction processing performed on lines and areas with the above width.
- FIG. 6C is a diagram showing an example of edge correction performed on a line having a width of two pixels.
- the RIP processing unit 14 changes the pixel value to the non-ejection value for the region for one pixel along one edge in the width direction in the width direction of the line. Therefore, the line after the edge correction processing is reduced by only one pixel on one side of the width of two pixels, and becomes a line having a width of one pixel as shown in the figure on the right side. Also in this case, one pixel at the tip is reduced in the length direction of the line.
- FIG. 6D is a diagram showing an example of edge correction performed on a line having a width of one pixel.
- the RIP processing unit 14 does not perform correction in the width direction of the line. Therefore, the line after the edge correction processing is a line having a width of one pixel as shown in the figure on the right side. Also in this case, one pixel at the tip is reduced in the length direction of the line. According to this example, the edge correction process can be performed more appropriately even when printing an image including thin lines. In addition, this makes it possible to more appropriately improve the quality of the printed image.
- FIG. 8 is a diagram for explaining the effect of the edge correction processing, and is a diagram showing the result of printing by performing the edge correction processing and the edge correction processing in the case of printing an image including blank characters of various sizes.
- the result of printing without printing is shown in comparison.
- the upper photograph shows the print result when the edge correction process by the method described above is performed. It can be considered that this printing result shows the result of thinning the line for one pixel.
- the lower photograph shows the printing result when printing is performed without performing the edge correction processing.
- the inventor of the present application actually prints various images such as an image including a thin line in addition to the example shown in FIG. 8, and prints quality by edge correction processing. It was confirmed that it can be appropriately increased.
- FIG. 7 is a diagram illustrating a modification of the edge correction process.
- 7 (a) and 7 (b) show an example of the range in which the pixel value is changed in the modification of the edge correction process.
- the edge correction process an example in which the pixel value for one pixel along the edge is changed to the non-ejection value has been mainly described.
- the range in which the pixel value is changed by the edge correction process is not limited to the example described above, and can be changed in various ways.
- the RIP processing unit 14 sets the pixel values of the pixels in the range to non-ejection values in the range of the width of 2 pixels or more along the edge (for example, the range of about 2 to 3 pixels). You may change it. More specifically, for example, FIG. 7A shows an example of a range in which the pixel value is changed by the edge correction process when the pixel value for two pixels along the edge is changed to the non-ejection value. .. Further, it is conceivable that the width for changing the pixel value in the edge correction process is determined based on, for example, the relationship between the size of the ink dots actually formed at the time of printing and the resolution. With this configuration, for example, edge correction can be appropriately performed according to the size and resolution of the ink dots.
- the width of the range in which the pixel value is changed by the edge correction process may be different between the edge on one side of the line or region and the edge on the other side, for example. More specifically, for example, in FIG. 7B, the pixel values for two pixels along the edge are changed to non-ejection values on one side of the line, and along the edge on the other side of the line and other parts. An example of changing the pixel value for one pixel to a non-ejection value is shown. Even in this configuration, edge correction can be appropriately performed.
- the operation when changing the pixel values of all the pixels within the range of the predetermined width along the edge to the non-ejection values has been mainly described.
- Such an operation can be considered as an operation of deleting all dots within a predetermined width from the edge.
- some pixels are selected from the pixels within a predetermined width range along the edge, and the pixel values are not ejected only for the pixel values of the selected pixels. It is also possible to change it to a value.
- the edge detection process it is conceivable to detect an edge in a preselected object.
- the edge correction process it is conceivable to perform edge correction only for the edges detected in the selected object. With such a configuration, by selecting a portion requiring correction, it is possible to more appropriately correct the edge according to the user's intention. Further, in this case, it is conceivable to select an object corresponding to a part where it is important to express a thin line, such as a place where a character is expressed, and detect or correct an edge.
- the auxiliary image used for selecting the object is further used to create the object. It is conceivable to make a choice.
- the auxiliary image can be considered, for example, an image composed of pixels in which auxiliary values used for object selection are set. More specifically, in this case, the RIP processing unit 14 determines the object to be selected based on the data showing the grayscale image corresponding to the ink used in the print execution unit 12 and the auxiliary data showing the auxiliary image.
- the auxiliary image can be considered as an image or the like in which an auxiliary value, which is a target value different from the color expression value, is set for each pixel.
- the RIP processing unit 14 is composed of pixels corresponding to the pixels of the grayscale image corresponding to the ink used in the print execution unit 12 to which a predetermined auxiliary value is set in the auxiliary image. Treat the part as the object to be detected and detect the edge in the object. With this configuration, objects can be selected easily and appropriately.
- the auxiliary data can be considered as, for example, data indicating an image in which the auxiliary value is set in the pixel.
- auxiliary data for example, it is conceivable to use a channel (alpha channel or the like) prepared separately from the color channel in the data showing a color image using a plurality of color channels corresponding to a plurality of colors.
- the print execution unit 12 corresponds to each color of ink used in the print execution unit 12 based on the color image data including the channel corresponding to such auxiliary data.
- the RIP processing unit 14 in the plate separation process, the RIP processing unit 14 generates image data including a plurality of color channels corresponding to these plurality of grayscale images and a channel showing auxiliary data. do. Then, in the edge detection process, the RIP processing unit 14 identifies the selected object based on these plurality of grayscale images and auxiliary data. Then, the edge is detected for the selected object. With this configuration, edges contained in a part of the image can be appropriately detected.
- the RIP processing unit 14 further performs a range selection process for receiving an instruction from the user to select a part of the range in the image such as a grayscale image generated by the plate separation process. ..
- a range selection process for example, an instruction to select a part of a range in the image may be received from the user for another image associated with the grayscale image.
- the part composed of the pixels in the range selected by the user in the range selection process is an object that distinguishes it from other parts in the image. And detect the edge in the object. Even in this configuration, the objects can be easily and appropriately selected.
- the RIP processing unit 14 performs edge detection processing and edge correction processing on the grayscale image corresponding to the ink of each color used in the print execution unit 12.
- edge correction in principle, for example, for a color image before the separation process or a binary bitmap image generated by the quantization process. It is also conceivable to detect and correct edges.
- edge detection or correction when edge detection or correction is performed on a binary bitmap image, it may be difficult to detect the edge because the ejection positions for ejecting ink are set discretely by the quantization process. be.
- the edge detection process and the edge correction process are performed on the gray scale image corresponding to the ink of each color, the edge detection and correction can be performed more appropriately without causing such a problem. ..
- edge detection processing and edge correction processing on the gray scale image corresponding to the inks of all colors used in the print execution unit 12. More specifically, as described above, when the ink of each color of YMCK is used in the print execution unit 12, edge detection processing and edge correction processing are performed on the grayscale images for these four colors. Is possible. With this configuration, the print quality can be improved more appropriately. Further, when the print execution unit 12 further uses inks other than each color of YMCK (for example, special color inks), the grayscale image corresponding to the color is further used at the time of generating the RIP generation data, and the grayscale image is used. It is also conceivable to perform edge detection processing and edge correction processing.
- edge detection processing and edge correction processing for example, among the inks of each color used in the print execution unit 12, only a part of the ink colors are subjected to edge detection processing and edge correction processing. Is also possible. In this case, it is preferable to perform edge detection processing and edge correction processing on at least a color in which edges are conspicuous, such as K color (black color) ink. Further, in this case, it is more preferable to perform the edge detection process and the edge correction process not only on the K color but also on any color other than the K color.
- the RIP processing unit 14 for example, a computer or the like that executes a program for RIP processing can be preferably used.
- this program can be considered as an example of a program for generating discharge position data.
- the RIP processing unit 14 operates as a discharge data generation device according to the program.
- each part of the RIP processing unit 14 can be considered to function as each part of the discharge data generation device.
- each part of the computer used as the RIP processing unit 14 can be considered to function as a processing unit that performs each processing described with reference to FIG. 2 or the like.
- the RIP processing unit 14 includes such a processing unit. More specifically, in this case, the RIP processing unit 14 includes an image acquisition processing unit, a resolution conversion processing unit, a plate separation processing unit, an edge detection processing unit, an edge correction processing unit, a RIP generation data generation unit, and the like. Can be thought of.
- the RIP generation data generation unit can be considered as an example of the discharge position data generation processing unit. Further, the RIP generation data generation unit can be considered to have a quantization processing unit and a command processing unit.
- the edge correction process the operation of changing the pixel value of at least a part of the pixels in a predetermined range along the edge to the non-ejection value has been mainly described.
- the edge is so that the amount of ink ejected to at least a part of the ejection position where ink is ejected from the inkjet head in order to draw the edge detected by the edge detection processing is reduced. It can be considered that the image processing for correcting the ink is performed. Then, as such an edge correction process, it is conceivable to perform an edge correction process by a method further different from the method described above.
- an inkjet head that ejects droplets having a plurality of types of capacities is used as the inkjet head for the inks of each color. Etc. are also conceivable. Then, in this case, it is conceivable to perform the edge correction process so that the capacity of the ink droplets ejected to at least a part of the ejection positions in the vicinity of the edge becomes small. Further, in this case, for the grayscale image generated by the plate separation process, the pixel values of the pixels in a predetermined range along the edge detected by the edge detection process are changed from the ejection value to the non-ejection value.
- the ejection value whose gradation value is closer to the non-ejection value can be considered as the gradation value which is closer to the value used as the non-ejection value among the gradation values set for each pixel of the grayscale image.
- the operation of such an edge correction process can be considered as a correction process for reducing the size of ink dots formed at at least a part of the ejection positions in the vicinity of the edge. Even in this configuration, the quality of printing executed by the print execution unit 12 can be appropriately improved.
- the present invention can be suitably used as a method for generating discharge position data.
Abstract
Description
Claims (12)
- 印刷装置におけるインクジェットヘッドからインクを吐出する吐出位置を示すデータである吐出位置データを生成する吐出位置データの生成方法であって、
前記印刷装置において印刷する画像を示す画像データである処理対象データに基づき、前記画像の少なくとも一部に対してエッジを検出するエッジ検出処理と、
前記エッジ検出処理で検出した前記エッジを補正する画像処理を前記画像に対して行うエッジ補正処理と、
前記エッジ補正処理での前記画像処理の結果を反映して前記吐出位置データを生成する吐出位置データ生成処理と
を行い、
前記処理対象データは、前記吐出位置に対応付けられる画素により構成される前記画像を示すデータであり、それぞれの画素の画素値として、対応する前記吐出位置にインクが吐出されないことを示す値である非吐出値、又は、前記非吐出値以外の値である吐出値が設定され、
前記エッジ検出処理において、前記非吐出値が設定されている画素と、前記吐出値が設定されている画素とが隣接している位置を検出することで、前記エッジを検出し、
前記エッジ補正処理において、前記エッジ検出処理で検出した前記エッジを描くために前記インクジェットヘッドからインクが吐出される前記吐出位置の少なくとも一部について、対応する画素の前記画素値を前記非吐出値に変更することで、前記エッジを補正する前記画像処理を行うことを特徴とする吐出位置データの生成方法。 - 前記エッジ補正処理において、補正の対象となる前記エッジの境界から所定の画素数の範囲内にあって前記画素値として前記吐出値が設定されている画素の前記画素値を前記非吐出値に変更する前記画像処理を行うことを特徴とする請求項1に記載の吐出位置データの生成方法。
- 前記エッジ補正処理において、前記エッジ検出処理で検出した前記エッジのうち、予め設定された線幅以下の線に対応して生じている前記エッジについて、前記エッジの補正によって当該線が消失しないように、前記画像に対する前記画像処理を行うことを特徴とする請求項1又は2に記載の吐出位置データの生成方法。
- 前記印刷装置は、複数色のインクを用いてカラー印刷を行うカラープリンタであり、
前記印刷装置において印刷するカラー画像を示すデータであるカラー画像データを取得する画像取得処理と、
前記印刷装置において用いる前記複数色のインクのそれぞれの色に対応するグレースケール画像を生成する処理であり、前記複数色のインクのそれぞれの色に合わせて前記カラー画像を分版することで、前記それぞれの色に対応するグレースケール画像を生成する分版処理と
を更に行い、
前記処理対象データとして、前記それぞれの色に対応するグレースケール画像を示すデータを用いることを特徴とする請求項1から3のいずれかに記載の吐出位置データの生成方法。 - 前記処理対象データは、前記画像内の一部を他の部分と区別したオブジェクトとして選択可能な形式のデータであり、
前記エッジ検出処理において、予め選択された前記オブジェクトの中にある前記エッジを検出することを特徴とする請求項1から4のいずれかに記載の吐出位置データの生成方法。 - 前記エッジ検出処理において、
色を表現するために設定される値とは別の目的の値である補助値がそれぞれの画素に設定される画像である補助画像を示す補助データを用い、
前記処理対象データが示す前記画像の画素のうち、前記補助画像において所定の前記補助値が設定されている画素に対応する画素で構成される部分を検出対象の前記オブジェクトとして扱い、当該オブジェクトの中にある前記エッジを検出することを特徴とする請求項5に記載の吐出位置データの生成方法。 - 前記画像中の一部の範囲を選択する指示をユーザから受け付ける範囲選択処理を更に行い、
前記エッジ検出処理において、前記処理対象データが示す前記画像の画素のうち、前記範囲選択処理で前記ユーザによって選択された前記範囲の中にある画素で構成される部分を前記画像内の他の部分と区別したオブジェクトとして扱い、当該オブジェクトの中にある前記エッジを検出することを特徴とする請求項1から4のいずれかに記載の吐出位置データの生成方法。 - 印刷装置におけるインクジェットヘッドからインクを吐出する吐出位置を示すデータである吐出位置データを生成する吐出位置データ生成装置であって、
前記印刷装置において印刷する画像を示す画像データである処理対象データに基づき、前記画像の少なくとも一部に対してエッジを検出するエッジ検出処理部と、
前記エッジ検出処理部で検出した前記エッジを補正する画像処理を前記画像に対して行うエッジ補正処理部と、
前記エッジ補正処理部での前記画像処理の結果を反映して前記吐出位置データを生成する吐出位置データ生成処理部と
を備え、
前記処理対象データは、前記吐出位置に対応付けられる画素により構成される前記画像を示すデータであり、それぞれの画素の画素値として、対応する前記吐出位置にインクが吐出されないことを示す値である非吐出値、又は、前記非吐出値以外の値である吐出値が設定され、
前記エッジ検出処理部は、前記非吐出値が設定されている画素と、前記吐出値が設定されている画素とが隣接している位置を検出することで、前記エッジを検出し、
前記エッジ補正処理部は、前記エッジ検出処理部で検出した前記エッジを描くために前記インクジェットヘッドからインクが吐出される前記吐出位置の少なくとも一部について、対応する画素の前記画素値を前記非吐出値に変更することで、前記エッジを補正する前記画像処理を行うことを特徴とする吐出位置データ生成装置。 - 印刷装置におけるインクジェットヘッドからインクを吐出する吐出位置を示すデータである吐出位置データをコンピュータに生成させるプログラムであって、
前記印刷装置において印刷する画像を示す画像データである処理対象データに基づき、前記画像の少なくとも一部に対してエッジを検出するエッジ検出処理と、
前記エッジ検出処理で検出した前記エッジを補正する画像処理を前記画像に対して行うエッジ補正処理と、
前記エッジ補正処理での前記画像処理の結果を反映して前記吐出位置データを生成する吐出位置データ生成処理と
を前記コンピュータに行わせ、
前記処理対象データは、前記吐出位置に対応付けられる画素により構成される前記画像を示すデータであり、それぞれの画素の画素値として、対応する前記吐出位置にインクが吐出されないことを示す値である非吐出値、又は、前記非吐出値以外の値である吐出値が設定され、
前記エッジ検出処理において、前記非吐出値が設定されている画素と、前記吐出値が設定されている画素とが隣接している位置を検出することで、前記エッジを検出させ、
前記エッジ補正処理において、前記エッジ検出処理で検出した前記エッジを描くために前記インクジェットヘッドからインクが吐出される前記吐出位置の少なくとも一部について、対応する画素の前記画素値を前記非吐出値に変更することで、前記エッジを補正する前記画像処理を行わせることを特徴とするプログラム。 - 複数色のインクを用いてカラー印刷を行う印刷装置におけるインクジェットヘッドからインクを吐出する吐出位置を示すデータである吐出位置データを生成する吐出位置データの生成方法であって、
前記印刷装置において印刷するカラー画像を示すデータであるカラー画像データを取得する画像取得処理と、
前記印刷装置において用いる前記複数色のインクのそれぞれの色に対応するグレースケール画像を生成する処理であり、前記複数色のインクのそれぞれの色に合わせて前記カラー画像を分版することで、前記それぞれの色に対応するグレースケール画像を生成する分版処理と、
前記それぞれの色に対応するグレースケール画像を示す画像データである処理対象データに基づき、前記グレースケール画像の少なくとも一部に対してエッジを検出するエッジ検出処理と、
前記エッジ検出処理で検出した前記エッジを補正する画像処理を前記グレースケール画像に対して行うエッジ補正処理と、
前記エッジ補正処理での前記画像処理の結果を反映して前記吐出位置データを生成する吐出位置データ生成処理と
を行い、
前記処理対象データは、前記吐出位置に対応付けられる画素により構成される前記グレースケール画像を示すデータであり、それぞれの画素の画素値として、対応する前記吐出位置にインクが吐出されないことを示す値である非吐出値、又は、前記非吐出値以外の値である吐出値が設定され、
前記エッジ検出処理において、前記非吐出値が設定されている画素と、前記吐出値が設定されている画素とが隣接している位置を検出することで、前記エッジを検出し、
前記エッジ補正処理において、前記エッジ検出処理で検出した前記エッジを描くために前記インクジェットヘッドからインクが吐出される前記吐出位置の少なくとも一部へ吐出されるインクが少なくなるように、前記エッジを補正する前記画像処理を行うことを特徴とする吐出位置データの生成方法。 - 複数色のインクを用いてカラー印刷を行う印刷装置におけるインクジェットヘッドからインクを吐出する吐出位置を示すデータである吐出位置データを生成する吐出位置データ生成装置であって、
前記印刷装置において印刷するカラー画像を示すデータであるカラー画像データを取得する画像取得処理部と、
前記印刷装置において用いる前記複数色のインクのそれぞれの色に対応するグレースケール画像を生成する処理を行う処理部であり、前記複数色のインクのそれぞれの色に合わせて前記カラー画像を分版することで、前記それぞれの色に対応するグレースケール画像を生成する分版処理部と、
前記それぞれの色に対応するグレースケール画像を示す画像データである処理対象データに基づき、前記グレースケール画像の少なくとも一部に対してエッジを検出するエッジ検出処理部と、
前記エッジ検出処理部で検出した前記エッジを補正する画像処理を前記グレースケール画像に対して行うエッジ補正処理部と、
前記エッジ補正処理部での前記画像処理の結果を反映して前記吐出位置データを生成する吐出位置データ生成処理部と
を備え、
前記処理対象データは、前記吐出位置に対応付けられる画素により構成される前記グレースケール画像を示すデータであり、それぞれの画素の画素値として、対応する前記吐出位置にインクが吐出されないことを示す値である非吐出値、又は、前記非吐出値以外の値である吐出値が設定され、
前記エッジ検出処理部は、前記非吐出値が設定されている画素と、前記吐出値が設定されている画素とが隣接している位置を検出することで、前記エッジを検出し、
前記エッジ補正処理部は、前記エッジ検出処理部で検出した前記エッジを描くために前記インクジェットヘッドからインクが吐出される前記吐出位置の少なくとも一部へ吐出されるインクが少なくなるように、前記エッジを補正する前記画像処理を行うことを特徴とする吐出位置データ生成装置。 - 複数色のインクを用いてカラー印刷を行う印刷装置におけるインクジェットヘッドからインクを吐出する吐出位置を示すデータである吐出位置データをコンピュータに生成させるプログラムであって、
前記印刷装置において印刷するカラー画像を示すデータであるカラー画像データを取得する画像取得処理と、
前記印刷装置において用いる前記複数色のインクのそれぞれの色に対応するグレースケール画像を生成する処理であり、前記複数色のインクのそれぞれの色に合わせて前記カラー画像を分版することで、前記それぞれの色に対応するグレースケール画像を生成する分版処理と、
前記それぞれの色に対応するグレースケール画像を示す画像データである処理対象データに基づき、前記グレースケール画像の少なくとも一部に対してエッジを検出するエッジ検出処理と、
前記エッジ検出処理で検出した前記エッジを補正する画像処理を前記グレースケール画像に対して行うエッジ補正処理と、
前記エッジ補正処理での前記画像処理の結果を反映して前記吐出位置データを生成する吐出位置データ生成処理と
を前記コンピュータに行わせ、
前記処理対象データは、前記吐出位置に対応付けられる画素により構成される前記グレースケール画像を示すデータであり、それぞれの画素の画素値として、対応する前記吐出位置にインクが吐出されないことを示す値である非吐出値、又は、前記非吐出値以外の値である吐出値が設定され、
前記エッジ検出処理において、前記非吐出値が設定されている画素と、前記吐出値が設定されている画素とが隣接している位置を検出することで、前記エッジを検出させ、
前記エッジ補正処理において、前記エッジ検出処理で検出した前記エッジを描くために前記インクジェットヘッドからインクが吐出される前記吐出位置の少なくとも一部へ吐出されるインクが少なくなるように、前記エッジを補正する前記画像処理を行わせることを特徴とするプログラム。
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