Adaptively coding method and apparatus utilizing variation in qu

Details Adaptively coding method and apparatus utilizing variation in qu Adaptively coding method and apparatus utilizing variation in qu

1994-06-21

1996-05-28

Chin, Tommy P.

Television

Bandwidth reduction system

Data rate reduction

348405, H04N 730

Patent

active

055216439

ABSTRACT:
An adaptive coder includes a circuit for calculating the number of intraframe and interframe blocks in one frame to be coded. When the calculated picture data is supplied to the coder, a quantization controller selects one of a number of curves for the determination of quantization step sizes, to thereby take optimal advantage of the number of blocks of each mode applied to the mode determine. In particular, a frame having a relatively large number of intraframe blocks results in selection of a curve having a large quantization step size. In contrast, a frame having a relatively large number of interframe blocks results in selection of a curve having a small quantization step size. The quantization controller determines and outputs the quantization step size, thereby taking advantage of a present buffer occupancy rate and the determined curve. Accordingly, the adaptive coder can prevent sudden changes in quantization step sizes due to the buffer occupancy rate, thereby permitting maintenance of a high picture quality during scene changes. A corresponding method is also described.

REFERENCES:
patent: 4972260 (1990-11-01), Fujikawa et al.
patent: 5089888 (1992-02-01), Zdepski et al.
patent: 5136371 (1992-08-01), Savatier
patent: 5396567 (1995-03-01), Jass

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