Quantizer with automatic pre-threshold

Details Quantizer with automatic pre-threshold Quantizer with automatic pre-threshold

1994-05-23

1995-10-24

Britton, Howard W.

Television

Bandwidth reduction system

Data rate reduction

348419, 3582611, H04N 750

Patent

active

054614228

ABSTRACT:
An improved video encoder performs quantization after run length conversion. This is in contrast to the conventional encoder wherein quanization takes place before run-level conversion. The inventive encoder design provides a unique look forward process for controlling the number of run-level pairs and thus the number of coded bits. In addition, the stringent speed requirements on the quantizer are reduced because only run-level pairs rather than all DCT coefficients are quantized.

REFERENCES:
patent: 5056154 (1991-10-01), Aono
patent: 5072302 (1991-12-01), Ronchetti

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