Method and apparatus for encoding image data, and...

Details Method and apparatus for encoding image data, and... Method and apparatus for encoding image data, and...

2006-06-06

2006-06-06

Wu, Jingge (Department: 2627)

Image analysis

Image compression or coding

Shape, icon, or feature-based compression

C382S251000, C382S250000, C382S239000, C382S248000, C375S240030, C375S240120, C375S240160, C375S240180

Reexamination Certificate

active

07058230

ABSTRACT:
An accurate encoding of image data representing a source image, which data is divided into a multiplicity of blocks is performed in accordance with features of the source image by defining a plurality of sub-areas each of which including one or more blocks; quantizing the multiple blocks; counting the number of valid coefficients among the quantization coefficients in each sub-area; adjusting the quantization coefficients of the plural sub-area in accordance with a distribution of the number of valid coefficients over the plural sub-areas (that is, a degree of appearance of the valid coefficients of each sub-area); and encoding the adjusted quantization coefficients. In addition to the accuracy, encoding of image data using sub-areas enhances a speed of processes.

REFERENCES:
patent: 5422736 (1995-06-01), Katayama
patent: 5666161 (1997-09-01), Kohiyama et al.
patent: 6728317 (2004-04-01), Demos
patent: 2002/0044693 (2002-04-01), Ogawa
patent: HEI 4-291882 (1992-10-01), None

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