LASER PRINT APPARATUS WITH DUAL HALFTONES
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Accused Products
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.
31 Citations
36 Claims
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1-20. -20. (canceled)
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21. 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 alternating between two or more nonzero values corresponding to 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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30. 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 alternating between two or more nonzero values corresponding to an intensity value of an pixel.
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36. 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 alternating between two or more nonzero values corresponding to 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.
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Specification