Image analysis – Image compression or coding
Patent
1995-06-27
1998-08-11
Moore, David K.
Image analysis
Image compression or coding
382240, 382166, 382239, 348390, G06K 900, G06K 936, H04N 712
Patent
active
057938920
ABSTRACT:
A pixel map signal is converted into a coefficient signal of block coefficient signals, each representing the pixels in a pixel map block (420) in a pixel map (410) with the coefficients in a hybrid polynomial. The coefficient signal is quantized by dividing each of the coefficient values in each of the block coefficient signals by quantization factors to produce quantized coefficient values which replace the coefficient values. Block coefficient signals which represent an edge block (424) in the pixel map (410) are divided by larger quantization factors than block coefficient signals which represent a center block (422) in the pixel map (410). As a result, smaller quantized coefficient values are obtained so that block coefficient signals which represent an edge block (424) are compressed to a greater extent than block coefficient signals that represent a center block (422) in the pixel map (410).
REFERENCES:
patent: 5046071 (1991-09-01), Tanoi
patent: 5122873 (1992-06-01), Golin
patent: 5510838 (1996-04-01), Yomdin et al.
patent: 5588069 (1996-12-01), Katayama et al.
R. C. Gonzalez and P. Wintz, "Digital Image Preocessing" Addison-Wesley, 1977, section 2.1.2 p. 15.
Pan Shao Wei
Wang Shay-Ping T.
Chen Wenpeng
Moore David K.
Motorola Inc.
Pickens S. Kevin
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