Laser print apparatus with dual halftones
First Claim
Patent Images
1. A printer controller for processing data representing an image, the printer controller comprising:
- a first module configured to perform a first halftone process on an edge portion of the image, wherein the edge portion is located by comparing an intensity value of a first pixel and an intensity value of a second pixel and wherein the first halftone process comprises accessing two or more nonzero values based on the intensity value of the first pixel and alternating between the two or more nonzero values when multiple pixels comprise a same intensity value as the intensity value of the first pixel; and
a second module configured to perform a second halftone process on a non-edge portion of the image, wherein the first halftone process comprises a higher resolution than the second halftone process.
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Abstract
A printing system comprises a memory configured to store image data representing an image. The printing system comprises a processor configured to perform a first digital halftone process on a first portion of the image and a second digital halftone process on a second portion of the image.
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Citations
20 Claims
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1. A printer controller for processing data representing an image, the printer controller comprising:
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a first module configured to perform a first halftone process on an edge portion of the image, wherein the edge portion is located by comparing an intensity value of a first pixel and an intensity value of a second pixel and wherein the first halftone process comprises accessing two or more nonzero values based on the intensity value of the first pixel and alternating between the two or more nonzero values when multiple pixels comprise a same intensity value as the intensity value of the first pixel; and a second module configured to perform a second halftone process on a non-edge portion of the image, wherein the first halftone process comprises a higher resolution than the second halftone process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A printer controller comprising:
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first circuitry for identifying edge pixels and center pixels; and second circuitry for applying a first halftone to at least some of the edge pixels of an image and a second halftone to at least some of the center pixels, wherein the first halftone comprises a higher resolution than the second halftone and the first halftone comprises accessing two or more nonzero values based on an intensity value of one of the edge pixels and alternating between the two or more nonzero values when additional edge pixels comprise the intensity value. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for halftoning an image, the method comprising:
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receiving image data; locating, in the image data, a first image portion including an edge and a second image portion lacking an edge by comparing an intensity value of a first pixel and an intensity value of a second pixel; applying a first halftone to the first image portion by accessing two or more nonzero values based on the intensity value of the first pixel and alternating between two or more nonzero values corresponding as one or more subsequent pixels have the intensity value of the first pixel; and applying a second halftone to the second image portion, wherein the second halftone has a lower resolution that the first halftone. - View Dependent Claims (17, 18, 19, 20)
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Specification