High-efficiency coding apparatus for compressing a digital video

Facsimile and static presentation processing – Facsimile – Auxiliary signal

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358433, 358426, 348415, 348420, H04N 1417, H04N 1415, H04N 712

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active

053071778

ABSTRACT:
Digital video signals are divided in blocks, maximum and minimum values of each block are extracted, and a frequency distribution of one frame period of a dynamic range in each block is detected. The coding condition is determined by the frequency distribution and a predetermined N kinds of characteristic tables, and by determining only one characteristic table, the signal obtained by subtracting the minimum value of each block from the digital video signals of each block is coded in variable length according to the dynamic range of each block. The characteristic table shows the relationship of the distortion or the number of quantization bits between the original signal and decoded signal after coding and decoding with respect to the dynamic range of digital video signal in each block, and the picture quality of decoded image is set as a parameter.

REFERENCES:
patent: 4547811 (1985-10-01), Ochi et al.
patent: 4703352 (1987-10-01), Kondo
patent: 4710811 (1987-12-01), Kondo
patent: 5166987 (1992-11-01), Kageyama
"A Study on High Efficiency Coding of HDTV Signal", Hideaki Shibata et al., the 5th Picture Coding Symposium of Japan, pp. 147-148, 1990.

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