Image compression system including encoder having run mode

Details Image compression system including encoder having run mode Image compression system including encoder having run mode

1997-06-30

2000-02-01

Lee, Thomas D

Image analysis

Image compression or coding

Adaptive coding

382232, 358426, H04N 1417

Patent

active

060212276

ABSTRACT:
An image compression system having a causal, context-based, single-pass adaptive filter encoder that encodes pixel values using multiple context-based threshold values. In the general case, the threshold value is a function of the context of a pixel being encoded. In one specific embodiment one threshold value is used in non-run mode contexts and another threshold value is used in run mode contexts. A single threshold decompressor may decode images encoded using the multi-threshold encoder of the invention. Other systems and methods are disclosed.

REFERENCES:
patent: 5748786 (1998-05-01), Zandi et al.
patent: 5764374 (1998-06-01), Seroussi et al.
M. J. Weinberger, G. Seroussi, and G. Sapiro, Hewlett-Packard Laboratories, Palo Alto, CA 94304; "A low complexity, context-based, lossless image compression algorithm", Data Compression Conference, Snowbird, Utah, Mar. 31--Apr. 3, 1996.
Dr. Daniel T. Lee, Hewlett-Packard Company, 1501 Page Mill Road, Palo Alto, CA 94304-1126, USA "CD 14495, Lossless and near-lossless coding of continuous tone still images (JPEG-LS)", ISO/IEC JTC1/SC29 WG1, Mar. 21, 1997.

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