Image processing apparatus, image forming apparatus, printer driver, image processing method and computer-readable storage medium
First Claim
Patent Images
1. An image processing apparatus for forming an image data which is used to form a corresponding image by a plurality of dots, comprising:
- converting means for converting a periphery of a stepped transition portion of a contour portion of at least a character and/or graphics of the image into smaller circular dots having a smaller size than dots forming portions other than the stepped transition portion, each pixel in the converted periphery being represented by a corresponding one of said smaller circular dots; and
determining means for determining a method of converting said periphery into the smaller circular dots, depending on an inclination of the contour portion,wherein said determining means varies the size of the dots depending on the inclination of the contour portion so that a size of first dots that are formed when the inclination of the contour portion is greater than 45 degrees is larger than a size of second dots that are formed when the inclination of the contour portion is 45 degrees or less.
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Abstract
An image forming apparatus forms an image by a plurality of dots, by forming a periphery of a stepped transition portion of a contour portion of at least a character and/or graphics of the image by dots having a smaller size than dots forming portions other than the stepped transition portion, and determining a method of forming the dots having the smaller size depending on an inclination of the contour portion.
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Citations
17 Claims
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1. An image processing apparatus for forming an image data which is used to form a corresponding image by a plurality of dots, comprising:
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converting means for converting a periphery of a stepped transition portion of a contour portion of at least a character and/or graphics of the image into smaller circular dots having a smaller size than dots forming portions other than the stepped transition portion, each pixel in the converted periphery being represented by a corresponding one of said smaller circular dots; and determining means for determining a method of converting said periphery into the smaller circular dots, depending on an inclination of the contour portion, wherein said determining means varies the size of the dots depending on the inclination of the contour portion so that a size of first dots that are formed when the inclination of the contour portion is greater than 45 degrees is larger than a size of second dots that are formed when the inclination of the contour portion is 45 degrees or less. - View Dependent Claims (2, 3, 4)
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5. A printer driver for creating an image data to be supplied to an image forming apparatus which forms a corresponding image by a plurality of dots, comprising:
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a converting part configured to convert a periphery of a stepped transition portion of a contour portion of at least a character and/or graphics of the image into smaller circular dots having a smaller size than dots forming portions other than the stepped transition portion, each pixel in the converted periphery being represented by a corresponding one of said smaller circular dots; and a determining part configured to determine a method of converting said periphery into the smaller circular dots, depending on an inclination of the contour portion, wherein said determining part varies the size of the dots depending on the inclination of the contour portion so that a size of first dots that are formed when the inclination of the contour portion is greater than 45 degrees is larger than a size of second dots that are formed when the inclination of the contour portion is 45 degrees or less. - View Dependent Claims (6, 7, 8, 9)
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10. An image processing method for forming an image data which is used to form a corresponding image by a plurality of dots, comprising:
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converting a periphery of a stepped transition portion of a contour portion of at least a character and/or graphics of the image into smaller circular dots having a smaller size than dots forming portions other than the stepped transition portion, each pixel in the converted periphery being represented by a corresponding one of said smaller circular dots; and determining a method of converting said periphery into the smaller circular dots, depending on an inclination of the contour portion, wherein a size of first dots tat are formed when the inclination of the contour portion is greater than 45 degrees is larger than a size of second dots that are formed when the inclination of the contour portion is 45 degrees or less. - View Dependent Claims (11, 12, 13)
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14. A computer-readable storage medium which stores a program for causing a computer to form an image data which is used to form a corresponding image by a plurality of dots, said program comprising:
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a converting procedure which causes the computer to convert a periphery of a stepped transition portion of a contour portion of at least a character and/or graphics of the image into smaller circular dots having a smaller size than dots forming portions other than the stepped transition portion, each pixel in the converted periphery being represented by a corresponding one of said smaller circular dots; and a determining procedure which causes the computer to determine a method of converting said periphery into the smaller circular dots, depending on an inclination of the contour portion, wherein said determining procedure varies the size of the dots depending on the inclination of the contour portion so that a size of first dots that are formed when the inclination of the contour portion is greater than 45 degrees is larger than a size of second dots that are formed when the inclination of the contour portion is 45 degrees or less. - View Dependent Claims (15, 16, 17)
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Specification