IMAGE PROCESSING DEVICE AND PRINTING APPARATUS FOR PERFORMING BIDIRECTIONAL PRINTING
First Claim
Patent Images
1. A printing apparatus that performs printing on a print medium, comprising:
- a dot data generator that performs a halftone process on image data representing a tone value of each of pixels constituting an original image to determine a status of dot formation on each of print pixels of the print image to be formed on the print medium, for generating dot data representing the determined status of dot formation, anda print image generator that forms a dot on each of the print pixels for generating a print image according to the dot data, whereinthe print image is formed by mutually combining print pixels belonging to each of a plurality of pixel position groups for which a physical difference is assumed at a formation of dots by the print image generator, in a common print area, andthe halftone process is configured to determine the status of dot formation on each of the print pixels on an assumption of the physical difference.
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Abstract
A printing apparatus performs printing on a print medium. The printing apparatus includes: a dot data generator that performs a halftone process on image data, wherein the print image is formed by mutually combining print pixels belonging to each of a plurality of pixel position groups for which a physical difference is assumed at a formation of dots by the print image generator, in a common print area, and the halftone process is configured to determine the status of dot formation on each of the print pixels on an assumption of the physical difference.
37 Citations
25 Claims
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1. A printing apparatus that performs printing on a print medium, comprising:
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a dot data generator that performs a halftone process on image data representing a tone value of each of pixels constituting an original image to determine a status of dot formation on each of print pixels of the print image to be formed on the print medium, for generating dot data representing the determined status of dot formation, and a print image generator that forms a dot on each of the print pixels for generating a print image according to the dot data, wherein the print image is formed by mutually combining print pixels belonging to each of a plurality of pixel position groups for which a physical difference is assumed at a formation of dots by the print image generator, in a common print area, and the halftone process is configured to determine the status of dot formation on each of the print pixels on an assumption of the physical difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A printing method of printing on a print medium, comprising:
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performing a halftone process on image data representing a tone value of each of pixels constituting an original image to determine a status of dot formation on each of print pixels of the print image to be formed on the print medium, for generating dot data representing the determined status of dot formation, and forming a dot on each of the print pixels for generating a print image according to the dot data, wherein the print image is formed by mutually combining a plurality of pixel position groups for which a physical difference is assumed at a formation of dots by the print image generator, in a common print area, and the halftone process is configured to determine the status of dot formation on each of the print pixels on an assumption of the physical difference. - View Dependent Claims (19, 20)
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21. A computer program product for causing a computer to generate print data to be supplied to a print image generator for generating a print image by forming dots on a print medium, the computer program product comprising:
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a non-transitory computer readable medium; and a computer program stored on the non-transitory computer readable medium, the computer program comprising a program for causing the computer to perform a halftone process on image data representing a tone value of each of pixels constituting an original image to determine a status of dot formation on each of print pixels of the print image to be formed on the print medium, for generating dot data representing the determined status of dot formation, wherein the print image is formed by mutually combining print pixels belonging to each of a plurality of pixel position groups for which a physical difference is assumed at a formation of dots by the print image generator, in a common print area, and the halftone process is configured to determine the status of dot formation on each of the print pixels on an assumption of the physical difference. - View Dependent Claims (22, 23)
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24. A printing apparatus that performs printing on a print medium, comprising:
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a dot data generator that performs a halftone process on image data representing a tone value of each of pixels constituting an original image to determine a status of dot formation on each of print pixels of the print image to be formed on the print medium, for generating dot data representing the determined status of dot formation, and a print image generator equipped with a printing head configured to generate a print image by forming dots on each of the print pixels during forward scan and backward scan of the printing head, while performing a main scan of the printing head, wherein the print image is formed by mutually combining print pixels belonging to each of a plurality of pixel position groups including a first pixel position group for which dots are formed during the forward scan of the printing head and a second pixel position group for which dots are formed during the backward scan of the printing head, and the halftone process is configured such that any of mutual correlation coefficients between a plurality of spatial frequency distributions consisting of spatial frequency distributions of dot patterns formed on the print pixels belonging to the first pixel position group, spatial frequency distributions of dot patterns formed on the print pixels belonging to the second pixel position group, and spatial frequency distributions of the print image is at least 0.7, at least for the tone level with relatively low dot density.
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25. A printing method of printing on a print medium, comprising:
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performing a halftone process on image data representing a tone value of each of pixels constituting an original image to determine a status of dot formation on each of print pixels of the print image to be formed on the print medium, for generating dot data representing the determined status of dot formation, and forming dots on each of the print pixels during forward scan and backward scan of a printing head, while performing a main scan of the printing head, for generating a print image according to the dot data, wherein the print image is formed by mutually combining print pixels belonging to each of a plurality of pixel position groups including a first pixel position group for which dots are formed during the forward scan of the printing head and a second pixel position group for which dots are formed during the backward scan of the printing head, and the halftone process is configured such that any of mutual correlation coefficients between a plurality of spatial frequency distributions consisting of spatial frequency distributions of dot patterns formed on the print pixels belonging to the first pixel position group, spatial frequency distributions of dot patterns formed on the print pixels belonging to the second pixel position group, and spatial frequency distributions of the print image is at least 0.7, at least for the tone level with relatively low dot density.
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Specification