Method for quantizing intra-block DC transform coefficients usin

Details Method for quantizing intra-block DC transform coefficients usin Method for quantizing intra-block DC transform coefficients usin

1994-06-03

1995-12-05

Coles, Sr., Edward L.

Television

Bandwidth reduction system

Data rate reduction

348419, 348390, 358432, 358433, H04N 730

Patent

active

054733774

ABSTRACT:
The quantization of intra-block DC transform coefficients is improved through the use of human visual characteristics. The method comprises the steps of converting each of the plurality of blocks included in the input digital video signal into a set of inter-block or intra-block DC and AC transform coefficients; selecting an intra-block DC transform coefficient from said set of inter-block or intra-block DC and AC transform coefficients; determining an intra-block DC quantizer step size based on a set of the selected intra-block DC transform coefficients; and generating a quantized intra-block DC transform coefficient from each of the transform coefficients included in the set of the selected intra-block DC transform coefficient through the use of the intra-block DC quantizer step size.

REFERENCES:
patent: 4698689 (1987-10-01), Tzou
patent: 5126857 (1992-06-01), Watanabe et al.
patent: 5294974 (1994-03-01), Naimpally et al.
patent: 5323187 (1994-06-01), Park
patent: 5335016 (1994-08-01), Nakagawa

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