Method and circuit for determining quantization interval in imag

Details Method and circuit for determining quantization interval in imag Method and circuit for determining quantization interval in imag

1996-11-01

1999-08-03

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348405, 348414, 348417, 348418, H04N 712, H04N 1102, H04N 1104

Patent

active

059331941

ABSTRACT:
Quantization interval determining method and circuit are provided. The quantization interval determining circuit has a quantizer matrix calculator, a macroblock classifier, a reference quantization interval storage, a block classifier, a bit table storage, a histogram calculator, a frame bit generation predictor, a reference quantization interval adjuster, a target bit allocator, and a bit rate controller. In the quantization interval determining method and circuit, a video signal is classified based on human visual sense characteristics, a reference quantization interval suited for each class is determined, a target bit is adaptively allocated, considering distribution of the video signal, to determine a quantization interval compatible with a given transmission speed, simultaneously with the reference quantization interval determination, and then a final quantization interval is determined. Therefore, when encoding a video signal by using a quantization interval obtained in the above manner, the compression rate of a video signal and the quality of a restored image can be increased.

REFERENCES:
patent: 5134476 (1992-07-01), Aravind et al.
patent: 5214507 (1993-05-01), Aravind et al.
patent: 5412430 (1995-05-01), Nagata
patent: 5416522 (1995-05-01), Igarashi
patent: 5481553 (1996-01-01), Suzuki et al.
"Test Model 4--Coded Representation of Picture and Audio Information", Test Model Editing Committee, International Organisation for Standardisation, pp. 72-75 (Jan. 1993).

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