System and method for fine granular scalable video with selective quality enhancement
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United States of America Patent
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Jul 17, 2001
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N/A
app pub date -
Jul 6, 1999
filing date -
Jul 6, 1999
priority date (Note) -
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Abstract
There is disclosed an adaptive quantization controller for use in a video encoder comprising a base layer circuit for receiving an input stream of video frames and generating compressed base layer video frames suitable for transmission to a streaming video receiver and an enhancement layer circuit for receiving the input stream of video frames and a decoded version of the compressed base layer video frames and generating enhancement layer video data associated with, and allocated to, corresponding ones of the compressed base layer video frames. The adaptive quantization controller receives at least one quantization parameter from the base layer circuit and, in response thereto, determines a corresponding shifting factor for shifting a bit plane associated with the enhancement layer video data. The adaptive quantizaion controller also modifies a data field in the enhancement layer video data to cause the video streaming receiver to assign a higher decoding priority to the shifted bit plane.
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