Video coding system with buffer control quantization step size
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United States of America Patent
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Oct 12, 1999
Issued Date -
N/A
app pub date -
May 25, 1994
filing date -
Nov 15, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and device for image coding, primarily intended to be applied in the transmission of video signals, convert a video signal to a bit stream by coding and quantising. The bit stream is stored in a buffer store before it is sent at a constant bit rate on a transmission line. The content in the buffer store is regulated by varying the step height in the quantiser. With the frame rate at the input being known and the frame rate and bit rate at the output being known, the ideal buffer store content can be determined. The actual buffer store content is sensed and compared with the ideal buffer store content and the difference between these two values is determined. The step height in the quantiser is adjusted as a function of the difference.
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