Title:
ENCODING IMAGE DATA USING MASK LOOKUP TABLE AND DECODING SUCH ENCODED IMAGE DATA
Document Type and Number:
WIPO Patent Application WO2006017405
Kind Code:
A3
Abstract:
In one aspect, an image (12) is quantized by assigning sub-ranges of pixel values in the image (12) to respective quantization levels. The quantized image is encoded based at least in part on a mask lookup table (20) assigning index values to respective masks (32), wherein each mask (32) corresponds to a respective spatial distribution of the quantization levels. In another aspect, a code (18) corresponding to an encoded image with pixel values quantized to respective quantization levels is received. The code (18) is decoded based at least in part on a mask lookup table (20) assigning index values to respective masks (32), wherein each mask (32) corresponds to a respective spatial distribution of the quantization levels.
Inventors:
BERGMAN RUTH (IL)
RUCKENSTEIN GITIT (IL)
SHAKED DORON (IL)
KESHET RENATO (IL)
RUCKENSTEIN GITIT (IL)
SHAKED DORON (IL)
KESHET RENATO (IL)
Application Number:
PCT/US2005/027111
Publication Date:
April 13, 2006
Filing Date:
July 29, 2005
Export Citation:
Assignee:
HEWLETT PACKARD DEVELOPMENT CO (US)
BERGMAN RUTH (IL)
RUCKENSTEIN GITIT (IL)
SHAKED DORON (IL)
KESHET RENATO (IL)
BERGMAN RUTH (IL)
RUCKENSTEIN GITIT (IL)
SHAKED DORON (IL)
KESHET RENATO (IL)
International Classes:
H04N1/41; G06T9/00
Foreign References:
| US5341442A | 1994-08-23 | |||
| US6567559B1 | 2003-05-20 | |||
| EP0525426A1 | 1993-02-03 |
Other References:
OLSEN S I: "Block truncation and planar image coding", PATTERN RECOGNITION LETTERS, NORTH-HOLLAND PUBL. AMSTERDAM, NL, vol. 21, no. 13-14, December 2000 (2000-12-01), pages 1141 - 1148, XP004228270, ISSN: 0167-8655
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