Television – Bandwidth reduction system – Data rate reduction
Patent
1995-08-22
1998-02-24
Chin, Tommy P.
Television
Bandwidth reduction system
Data rate reduction
348406, 348404, 348419, H04N 718
Patent
active
057215898
ABSTRACT:
A moving picture coding apparatus wherein the amount of operation for calculation of an quantization step size to be used for coding of a picture signal by a coding section is reduced includes a bit amount estimation section estimates an amount of bits to be generated for a currently inputted frame using a predetermined estimated quantization step size. A coding section encodes the currently inputted frame using a quantization step size. A calculation section derives, from the estimated quantization step size used and the estimated bit amount estimated by the bit amount estimation section for the currently inputted frame, an estimated quantization step size used and an estimated bit amount estimated by the bit amount estimation section for the last frame, and a quantization frame used and an amount of bits generated by the coding section for the last frame, a relational expression between the quantization step size and the bit amount, and calculates, based on the thus derived relational expression, the quantization step size with which a bit amount equal to a predetermined target bit amount is obtained.
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Chin Tommy P.
NEC Corporation
Rao Anand S.
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