Adaptive block size image compression method and system

Facsimile and static presentation processing – Facsimile – Auxiliary signal

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358433, 382 41, H04N 1415

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active

050218913

ABSTRACT:
An image compression system and method for compressing image data for transmission. Each block and corresponding sub-blocks of pixel data is subjected to a discrete cosine transform (DCT) operation. Varying levels of sub-blocks of resulting corresponding transform coefficients are selected for construction into a composite transform coefficient block corresponding to each input block of pixel data. The selection of transform coefficient block size for the composite block is determined by a comparison process between transform block and sub-block coding efficiency. The composite block is variable length coded to further reduce bit count in the compressed data.

REFERENCES:
patent: 4179709 (1979-12-01), Workman
patent: 4293920 (1981-10-01), Merola
patent: 4504860 (1985-03-01), Nicol et al.
patent: 4774574 (1988-09-01), Daly et al.
patent: 4807042 (1989-02-01), Tanaka
patent: 4922341 (1990-05-01), Strobach
patent: 4924309 (1990-05-01), Hartnack et al.
"Discrete Cosine Transform", by N. Ahmed et al., IEEE Transactions on Computers, Jan. 1974, pp. 90-93.
"Adaptive Coding of Monochrome and Color Images", by Wen-Hsiung Chen et al., IEEE Transactions on Communications, vol. Com-25, No. 11, Nov. 1977, pp. 1285-1292.
"Interframe Cosine Transform Image Coding", by John A. Roese et al., IEEE Transactions on Communications, vol. Com-25, No. 11, Nov. 1977, pp. 1329-1339.
"Distributions of the Two-Dimensional DCT Coefficients for Images", by Randall C. Reininger et al., IEEE Transactions on Communications, vol. Com-31, No. 6, Jun. 1983, pp. 835-839.
"Scene Adaptive Coder", by Wen-Hsiung Chen et al., IEEE Transactions on Communications, vol. Com-32, No. 3, Mar. 1984, pp. 225-232.
"Hamming Coding of DCT-Compressed Images over Noisy Channels", by David R. Comstock et al., IEEE Transactions on Communications, vol. Com-32, No. 7, Jul. 1984, pp. 856-861.

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