Adaptive pixel management using object type identification

• US 6,753,976 B1
• Filed: 12/03/1999
• Issued: 06/22/2004
• Est. Priority Date: 12/03/1999
• Status: Expired due to Fees

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Smith, Glenn K., Dudek, Lesley P., Torpey, Peter A., Hull, Virgil Joseph
• Primary Examiner(s): Lee, Thomas D.
• Application Number:
  US09/453,789
• Time in Patent Office: 1,663 Days
• Field of Search: 358/1.9, 358/2.1, 358/3.27, 358/448, 358/453, 382/173, 382/176, 382/254, 382/266
• US Class Current: 358/1.9
• CPC Class Codes: H04N 1/56 Processing of colour picture signals H04N1/52 takes precedence
• CPC Class Codes: H04N 1/6072 adapting to different types of images, e.g. characters, graphs, black and white image portions

Abstract

The present invention is directed to a method for differentially processing image types within a document image to enhance the quality of on an image on a receiving medium. In one aspect of the invention, the method begins by receiving document image data including one or more image regions. The method determines for each image region whether the region includes any image data corresponding to a first image type. The method then prints regions including image data corresponding to the first image type according to a first pixel management process and prints regions not including image data corresponding to the first image type according to a second pixel management process.

Claims

1. A method of processing document image data for printing an image on a receiving medium, comprising:

receiving document image data, the image data comprising at least two elements from the group of text objects, graphic objects and pictorial objects;

classifying each element in the image data as being one of a text object, a graphic object, or a pictorial object;

printing the image data corresponding to elements classified as a text object according to a set of text processing parameters, the text processing parameters including processing text smaller than a text threshold size according to a set of small text processing parameters and processing text greater than the text threshold size according to a set of large text processing parameters, wherein the set of text processing parameters includes processing text on a printed background that is greater than a text-on-color threshold size according to the set of large text processing parameters;

printing the image data corresponding to elements classified as a graphics object according to a set of graphics processing parameters; and

printing the image data corresponding to elements classified as a pictorial object according to a set of pictorial processing parameters.

2. The method according to claim 1, wherein the set of graphics processing parameters further comprises processing graphics objects smaller than a graphics threshold size according to a set of small graphics processing parameters and processing graphics objects greater than the graphics threshold size according to a set of large graphics processing parameters.

3. The method of claim 2, wherein the set of large graphics processing parameters comprises at least one process selected from intercolor bleed control, under-printing and edge quality processes.

4. The method of claim 3, wherein the set of small graphics processing parameters comprises edge quality processing.

5. The method according to claim 1, wherein the set of text processing parameters further comprises processing text on a non-printed background that is greater than a text-on-white threshold size according to the set of large text processing parameters.

6. The method of claim 5, wherein the set of large text processing parameters comprises at least one process selected from intercolor bleed control, under-printing and edge quality processes.

7. The method of claim 6, wherein the set of small text processing parameters comprises edge quality processing.

8. The method of claim 5, wherein the set of large text processing parameters comprises intercolor bleeding control processing and edge quality processing.

9. The method of claim 8, wherein the intercolor bleed control processing comprises modifying pixels within a black border near a black/color interface according to a black bitmap modification pattern.

10. The method of claim 9, wherein the intercolor bleed control processing comprises modifying pixels within a color border near a black/color interface according lo a color bitmap modification pattern.

11. A method of processing document image data to generate an image on a receiving medium, comprising:

receiving image data comprising one or more image regions, wherein at least one of the image regions includes a plurality of image types;

determining for each image region including a plurality of image types whether the region includes any image data corresponding to a first image type, the first pixel management process including at least one process from the group of intercolor bleeding control processing, under-printing processing and edge quality processing, wherein the intercolor bleed control processing comprises modifying pixels within a color border near a black/color interface according to a color bitmap modification pattern;

printing image regions including image data corresponding to the first image type according to a first pixel management process; and

printing image regions not including image data corresponding to the first image type according to a second pixel management process.

12. The method of claim 11, wherein the intercolor bleed control processing further comprises modifying pixels within a black border near a black/color interface according to a black bitmap modification pattern.