Laser print apparatus with dual halftones
First Claim
Patent Images
1. A printing system comprising:
- a memory configured to store image data representing an image; and
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, wherein the processor is configured to locate the first portion by comparing an intensity value of a first pixel and an intensity value of a second pixel, wherein the second pixel is adjacent to the first pixel,wherein the first portion is an edge of the image and the second portion is not an edge of the image, and the first digital halftone process comprises a higher resolution than the second digital halftone process,wherein the processor adjusts the intensity value of the first pixel if a difference between the intensity value of the first pixel and the intensity value of the second pixel is greater than a predetermined threshold, andwherein the first digital halftone process determines edge pixel values by selecting one of two nonzero pixel values.
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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
42 Claims
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1. A printing system comprising:
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a memory configured to store image data representing an image; and 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, wherein the processor is configured to locate the first portion by comparing an intensity value of a first pixel and an intensity value of a second pixel, wherein the second pixel is adjacent to the first pixel, wherein the first portion is an edge of the image and the second portion is not an edge of the image, and the first digital halftone process comprises a higher resolution than the second digital halftone process, wherein the processor adjusts the intensity value of the first pixel if a difference between the intensity value of the first pixel and the intensity value of the second pixel is greater than a predetermined threshold, and wherein the first digital halftone process determines edge pixel values by selecting one of two nonzero pixel values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A printing system comprising:
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a memory configured to store image data; and a processor configured to locate image edges in the image data and apply a first halftone to image data that is located at an image edge and apply a second halftone to image data that is not located at an image edge, wherein the processor is configured to locate the image edge by comparing an intensity value of a first pixel and an intensity value of a second pixel, wherein the second pixel is adjacent to the first pixel, wherein the first halftone comprises a higher resolution than the second halftone, wherein the processor adjusts the intensity value of the first pixel if a difference between the intensity value of the first pixel and the intensity value of the second pixel is greater than a predetermined threshold, and wherein the first halftone determines edge pixel values by selecting one of two nonzero pixel values. - View Dependent Claims (10, 11, 12)
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13. A method for printing an image, the method comprising:
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receiving image data; locating a first image portion comprising an edge and a second image portion not comprising an edge in the image data by comparing an intensity value of a first pixel and an intensity value of a second pixel, wherein the second pixel is adjacent to the first pixel; applying a first halftone to the first image portion by selecting one of two nonzero pixel values to determine edge pixel values; applying a second halftone to the second image portion; printing the image data with the applied first halftone and the applied second halftone; and adjusting the intensity value of the first pixel if a difference between the intensity value of the first pixel and the intensity value of the second pixel is greater than a predetermined threshold, wherein applying the first halftone comprises applying a halftone having a higher resolution than the second halftone. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A printing system comprising:
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means for storing image data representing an image; means for performing 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, wherein the first portion is located by comparing an intensity value of a first pixel and an intensity value of a second pixel, wherein the second pixel is adjacent to the first pixel, and means for adjusting intensity that adjusts the intensity value of the first pixel if a difference between the intensity value of the first pixel and the intensity value of the second pixel is greater than a predetermined threshold, wherein the first portion is an edge of the image and the second portion is not an edge of the image, and the first digital halftone process comprises a higher resolution than the second digital halftone process, and wherein the first digital halftone process determines edge pixel values by selecting one of two nonzero pixel values. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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30. A printing system comprising:
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means for storing image data; means for locating image edges in the image data and applying a first halftone to image data that is located at an image edge and applying a second halftone to image data that is not located at an image edge, wherein the image edge is located by comparing an intensity value of a first pixel and an intensity value of a second pixel, wherein the second pixel is adjacent to the first pixel, and means for adjusting intensity that adjusts the intensity value of the first pixel if a difference between the intensity value of the first pixel and the intensity value of the second pixel is greater than a predetermined threshold, wherein the first halftone comprises a higher resolution than the second halftone, and wherein the first halftone determines edge pixel values by selecting one of two nonzero pixel values. - View Dependent Claims (31, 32, 33)
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34. A computer-readable medium having computer-readable content to cause a computer to perform acts of:
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receiving image data; locating a first image portion comprising an edge and a second image portion not comprising an edge in the image data by comparing an intensity value of a first pixel and an intensity value of a second pixel, wherein the second pixel is adjacent to the first pixel; applying a first halftone to the first image portion by selecting one of two nonzero pixel values to determine edge pixel values; applying a second halftone to the second image portion; adjusting the intensity value of the first pixel if a difference between the intensity value of the first pixel and the intensity value of the second pixel is greater than a predetermined threshold; and printing the image data with the applied first halftone and the applied second halftone, wherein applying the first halftone comprises applying a higher resolution than the second halftone. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42)
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Specification