Image analysis – Image compression or coding
Patent
1995-04-05
1996-05-14
Couso, Jose L.
Image analysis
Image compression or coding
382239, 382254, G06K 936
Patent
active
055175813
ABSTRACT:
An image-coding system reduces image data redundancies and perceptual irrelevancies through progressive sub-band coding. The image is separated into a plurality of sub-bands. From this sub-band information, a perceptual metric, based on the properties of the sub-band filters, quantizer error distribution, and properties of the human visual system, is determined which provides the maximum amount of coding noise that may be introduced to each pixel in every sub-band without causing perceptible degradation of the coded image. This perceptual metric is used to adjust the quantizer used in encoding each sub-band signal. In addition, redundancy in the output of the quantizer is reduced using a multidimensional Huffman compression scheme.
REFERENCES:
patent: 4048443 (1977-09-01), Crochiere et al.
patent: 4405920 (1983-09-01), Weisstein
patent: 4500911 (1985-02-01), Ninomiya et al.
patent: 4580162 (1986-04-01), Mori
patent: 4969040 (1990-11-01), Gharavi
patent: 4987480 (1991-01-01), Lippman et al.
patent: 5109451 (1992-04-01), Aono et al.
patent: 5309526 (1994-05-01), Pappas et al.
W. H. Chen and C. H. Smith, "Adaptive Coding of Monochrome and Color Images", IEEE Trans. Comm., vol. COM-25, pp. 1285-1292, Nov. 1987.
J. W. Woods and S. D. O'Neil, "Sub-Band Coding of Images", IEEE ASSP, vol. 34, No. 5, Oct. 1986, pp. 1278-1288.
H. Charavi and A. Tabatabai "Sub-Band Coding of Digital Images Using Two-Dimensional Quadrature Mirror Filtering", Proc. SPIE, vol. 707, pp. 51-61, Sep. 1986.
P. H. Westerink, J. W. Woods and D. E. Boekee, Proc. of Seventh Benelux Information Theory Symposium, pp. 143-150, 1986.
King N. Ngan et al, "Cosine Transform Coding Incorporating Human Visual System Model", SPIE vol. 707, Visual Communications and Image Processing, (1986), pp. 165-171.
R. V. Cox, "The Design of Uniformly and Nonuniformly Spaced Pseudo Quadrature Mirror Filters", IEEE Trans. ASSP. vol. ASSP-34, No. 5, Oct. 1986, pp. 1090-1096.
Johnston James D.
Safranek Robert J.
AT&T Corp.
Couso Jose L.
Rosenblatt David M.
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