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US 7,733,532 B2Granted
Laser print apparatus with dual halftones
AssigneeMarvell International Technology Ltd.
InventorsDouglas Gene Keithley, Jay R. Shoen
Life of this patent
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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.
Claims42
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, and
- wherein the first digital halftone process determines edge pixel values by selecting one of two nonzero pixel values.
3 more elements
A printing system comprising:
- 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.
3 more elements
A method for printing an image, the method comprising:
- 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.
5 more elements
A printing system comprising:
- 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.
2 more elements
A printing system comprising:
- 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.
2 more elements
A computer-readable medium having computer-readable content to cause a computer to perform acts of:
- 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.
4 more elements
Dependencies are inferred from the claim text.