Image compression based on pattern fineness and edge presence

Details Image compression based on pattern fineness and edge presence Image compression based on pattern fineness and edge presence

1993-06-25

1994-12-20

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348421, H04N 7130, H04N 7133

Patent

active

053749588

ABSTRACT:
Alternating current coefficients in a block of orthogonal transform coefficients representing a digital image are quantized with a quantization step size selected with regard to whether the block represents motion or a still image, the fineness of the pictorial pattern in the image, the position of the coefficients in the block, and whether the coefficients represent luminance or chrominance information in the image. The fineness of the pictorial pattern is determined in accordance with the number of alternating current coefficients that exceed a first relatively small threshold value. If any of the alternating current coefficients exceed a second relatively large threshold value, the block is considered to have a high activity, that is, a fine pattern, and so is quantized with a large quantization step.

REFERENCES:
patent: 4734767 (1988-03-01), Kaneko et al.
patent: 4920426 (1990-04-01), Hatori et al.
patent: 5047852 (1991-09-01), Hanyu et al.
patent: 5073821 (1991-12-01), Juri
patent: 5150208 (1992-09-01), Otaka et al.
IEEE Military Communications Conference vol. 2, Oct. 20-23, 1985, Boston (MA) US, pp. 628-634; H. Magal et al.: `Image Implementation`.
International Conference on EC-Energy, Computer, Communication and Control Systems, vol. 3, Aug. 28-30, 1992, New Delhi, IN, XP000333346, pp. 261-265; S. C. Kwatra et al.: `Compressing the composite digital television signal by encoding the sub-bands`.
Patent Abstracts of Japan vol. 15, No. 269 (E-1087) 9 Jul. 1991 & JP-A-03 089 689 (Matsushita Electric Industry Co., Ltd.) 15 Apr. 1991.

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