Method, rate controller, and system for preventing overflow and

Details Method, rate controller, and system for preventing overflow and Method, rate controller, and system for preventing overflow and

1995-02-23

1997-10-14

Coles, Sr., Edward L.

Image analysis

Image compression or coding

Adaptive coding

358426, 358430, 348390, 348419, H04N 141, H04N 712, H04N 1102

Patent

active

056779690

ABSTRACT:
The present invention is method, rate controller, and system for preventing overflow and underflow of a decoder buffer in a video compression system. First, a plurality of quantized video bits is received from an encoder (102). The plurality of quantized video bits correspond to a video frame type. Then, a virtual buffer is created, in a rate controller, to model fullness of a decoder buffer, based on the quantized video bits, to produce a virtual buffer fullness (104). A quantization stepsize estimate is finally determined, in a rate controller, based on at least a first predetermined target bit allocation, the video frame type, and the virtual buffer fullness (106). The quantization step size estimate will prevent the overflow and underflow of a decoder buffer.

REFERENCES:
patent: 4954892 (1990-09-01), Asai et al.
patent: 5134476 (1992-07-01), Aravind et al.
patent: 5159447 (1992-10-01), Haskell et al.
patent: 5241383 (1993-08-01), Chen et al.
patent: 5283646 (1994-02-01), Bruder
patent: 5491513 (1996-02-01), Wickstrom et al.

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