Decompression for printing and display systems

• US 20070140572A1
• Filed: 12/19/2005
• Published: 06/21/2007
• Est. Priority Date: 12/19/2005
• Status: Abandoned Application

• Current Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Original Assignee: Xerox Corporation (Xerox Holdings Corp.)
• Inventors: Buckley, Robert
• Application Number:
  US11/311,876
• Publication Number:
  US 20070140572A1
• Time in Patent Office: Days
• US Class Current: 382/233
• CPC Class Codes: H04N 19/647 using significance based coding, e.g. Embedded Zerotrees of Wavelets [EZW] or Set Partitioning in Hierarchical Trees [SPIHT]

Abstract

A method for decompressing a job in a document management system, such as a printer, scanner or display device, is provided. The method includes buffering the compressed image data, and decompressing the buffered compressed image data such that the decompressing varies as a function of a resolution level and either a first set of quality layers or a second set of quality layers. The number of quality layers in the first quality layer set is greater than the number of quality layers in the second quality set and, pursuant to the decompressing, the resolution level is corresponded with the second quality layer set so that the compressed image data is decompressed with less quality layers than in the first quality layer set.

Claims

1. A printing system for processing a print job including compressed print related data, comprising:

a decompression system for decompressing the compressed print related data;

said decompression system including a processor and a program for decompressing of the compressed print related data, said processor functioning with the decompression program such that the decompressing varies as a function of a resolution level and either a first set of quality layers or a second set of quality layers, wherein the number of quality layers in the first quality layer set is greater than the number of quality layers in the second quality set, and wherein, pursuant to said decompressing, the resolution level is corresponded with the second quality layer set so that the compressed image data is decompressed with less quality layers than in the first quality layer set.

2. The printing system of claim 1, in which the decompressing varies as a function of either a first resolution level or a second resolution level, and in which said resolution level is the second resolution level, wherein the compressed image data is decompressed with the first quality layer set when decompressing occurs as a function of the first resolution level, and the compressed image data is decompressed with the second quality layer set when decompressing occurs as a function of the second resolution level.

3. The printing system of claim 2, further comprising a look-up table, wherein the first resolution level is mapped to the first quality layer set and the second resolution level is mapped to the second quality layer set.

4. A decompression system for decompressing a job in a document management system, the job including compressed image data and the compressed image data being buffered in memory, comprising:

a processor; and

a decompression program operating with said processor in such a way that the decompressing varies as a function of a resolution level and either a first set of quality layers or a second set of quality layers, wherein the number of quality layers in the first quality layer set is greater than the number of quality layers in the second quality set, and pursuant to said decompressing, the resolution level is corresponded with the second quality layer set so that the compressed image data is decompressed with less quality layers than in the first quality layer set.

5. The decompression system of claim 4, in which the decompressing varies as a function of either a first resolution level or a second resolution level, and in which said resolution level is the second resolution level, wherein the compressed image data is decompressed with the first quality layer set when decompressing occurs as a function of the first resolution level, and the compressed image data is decompressed with the second quality layer set when decompressing occurs as a function of the second resolution level.

6. The decompression system of claim 5, further comprising a look-up table, wherein the first resolution level is mapped to the first quality layer set and the second resolution level is mapped to the second quality layer set.

8. The decompression system of claim 4, wherein said processor and decompression program are part of a document management system.

9. The decompression system of claim 8, wherein said document management system comprises a handheld computer based device.

7. The decompression system of 5, in which the first resolution level corresponds with a first image type and the second resolution corresponds with a second image type, and pursuant to said decompressing, either the first image type is corresponded with the first quality layer set or the second image type is corresponded with the second quality layer set.

10. A decompression system for decompressing to either a first image type or a second image type, comprising:

a processor; and

a decompression program operating with said processor in such a way that the decompressing varies as a function of either the first image type and a first set of quality layers or the second image type and a second set of quality layers, wherein the number of quality layers in the first quality layer set is greater than the number of quality layers in the second quality layer set, and wherein the first quality layer set is used for decompressing the first image type, and the second quality layer set is used in decompressing the second image type.

12. The decompression system of claim 10, further comprising a look-up table, wherein the first image type is mapped to the first quality layer set and the second image type is mapped to the second quality layer set.

13. The decompression system of claim 10, wherein said processor and decompression program are part of a document management system.

11. The decompression system of 10, wherein the first image type comprises a thumbnail image and the second image type comprises a full device resolution image.

14. A method for decompressing a job in a document management system, the job including compressed image data, comprising:

buffering the compressed image data; and

decompressing the buffered compressed image data such that the decompressing varies as a function of a resolution level and either a first set of quality layers or a second set of quality layers, wherein the number of quality layers in the first quality layer set is greater than the number of quality layers in the second quality set, and wherein, pursuant to said decompressing, the resolution level is corresponded with the second quality layer set so that the compressed image data is decompressed with less quality layers than in the first quality layer set.

15. The method of claim 14, in which said decompressing varies as a function of either a first resolution level or a second resolution level, and in which said resolution level is the second resolution level, wherein said decompressing further includes using the first quality layer set when decompressing occurs as a function of the first resolution level, and using the second quality layer set when decompressing occurs as a function of the second resolution level.

16. The method of claim 15, further comprising using a look-up, further comprising mapping the first resolution level to the first quality layer set and mapping the second resolution level to the second quality layer set.

17. The method of claim 15, in which the first resolution level corresponds with a first image type and the second resolution corresponds with a second image type, and wherein, pursuant to said decompressing, either the first image type is corresponded with the first quality layer set or the second image type is corresponded with the second quality layer set.

18. The method of claim 14, wherein said decompressing is executed in a document management system.

19. The method of claim 18, further comprising using a handheld computer based device in the document management system.