Encoding method and encoder using it

Details Encoding method and encoder using it Encoding method and encoder using it

1999-01-26

2000-02-08

Britton, Howard

Television

Bandwidth reduction system

Data rate reduction

348412, H04N 736

Patent

active

060232978

ABSTRACT:
The deterioration of the quality of a picture due to encoding/decoding is improved by setting the quantity of feedback on which the contents of input data reflect.
Judging means 50 for judging whether input data are encoded/decoded or not based upon each quantity of generated codes in units of GOP from N pieces of fixed quantizers and control means for estimating the character of input data using the above each quantity of generated codes and the result of the judgment and calculating a feedback threshold FBT to be added to the target quantity of codes based upon the result of the estimate are provided. When the judging means judges that encoding/decoding is executed, the means controls a feedback threshold FBT using each quantity of generated codes in units of GOP from N pieces of fixed quantizers so that the variation of quantized values between macro blocks is reduced and in the result of the other judgment, the means controls a feedback threshold FBT so that repeatability is regarded as important. Hereby, the quality of a picture is prevented from being deteriorated due to encoding/decoding.

REFERENCES:
patent: 5291282 (1994-03-01), Nakagawa
patent: 5317396 (1994-05-01), Fujinami
patent: 5748249 (1998-05-01), Fujiwara
patent: 5822006 (1998-10-01), Tahara
patent: 5880785 (1999-03-01), Fujiwara
patent: 5926222 (1999-07-01), Nickerson

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