Television – Bandwidth reduction system – Data rate reduction
Patent
1995-01-10
1996-07-23
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348420, 358427, H04N 730
Patent
active
055394680
ABSTRACT:
An image signal is divided into pixel blocks, each of which is subjected to orthogonal transform to be converted to transform coefficients. The transform coefficients are divided by respective thresholds set as a quantization matrix to become quantized coefficients. Coding symbols are constructed from the quantized coefficients using a coding symbol table which includes additional coding symbols corresponding to adaptive coding operations. The coding symbols are entropy-coded to become coded information. One of the adaptive coding operations is effected in accordance with identification information that is produced in accordance with a statistical parameter of the pixel blocks. The transform and quantizing operations are stopped during a block run, and after the end of the block run a coding symbol corresponding to the block-run detection is coded. The quantization matrix is switched in accordance with variance of pixel values of the pixel block, and a coding symbol corresponding to the switching of the quantization matrix is coded.
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patent: 5197087 (1993-03-01), Iwahashi et al.
"Image Data Coding Algorithm II--Transform Coding-," The Journal of the Institute of Television Engineers of Japan, vol. 43, No. 10, 1989, pp. 1145-1153.
"Digital Image Processing", William K. Pratt, A Wiley-Interscience Publication, 1978, pp. 622-699.
"A Method for the Construction of Minimum-Redundancy Codes," David A. Huffman, IEEE vol. 40, Sep. 1952, pp. 1098-1101.
"Digital Compression and Coding of Continuous-Tone Still Images, Part I: Requirements and Guidelines," International Standard DIS 10918-1, Jan. 1991.
Kamizawa Koh
Suzuki Kazuhiro
Umezawa Ken
Au A.
Chin Tommy P.
Fuji 'Xerox Co., Ltd.
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