DCT video signal compression device with intrafield/interfield s

Details DCT video signal compression device with intrafield/interfield s DCT video signal compression device with intrafield/interfield s

1993-03-06

1991-04-02

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358136, H04N 712

Patent

active

050050761

ABSTRACT:
The digital signal is decomposed in intrafield blocks each comprising a set number of adjacent image elements, and each intrafield block, or an intrafield block or an interframe block derived therein, is subjected to a Discrete Cosine Transform and the transformed signal is applied to quantizer to generate a quantized signal which is encoded at variable length and loaded to a transmission buffer, the quantization resolution being inversely proportional to the buffer fill rate. According to the invention, a digital low-pass filter is connected to filter the block to be subjected to Discrete Cosine Transform, and is subjected to the buffer so that its upper-frequency cutoff lowers as the buffer fill rate increases.

REFERENCES:
patent: 4825285 (1989-04-01), Speidel et al.
patent: 4833535 (1989-05-01), Ozeki et al.
patent: 4897855 (1990-01-01), Acampora
patent: 4941043 (1990-02-01), Jass
"Scene Adaptive Coder", by W. Chen and W. K. Pratt, IEEE Transaction on Communications, vol. Com-32, No. 3, Mar. 1984, pp. 225-232.
2nd International Workshop on Signal Processing of HDTV, 29 Feb.-2 Mar. 1988, vol. 2, pp. 2, 4, 6, 8.

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