Human visual system (HVS)-based pre-filtering of video data
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United States of America Patent
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Sep 30, 2008
Grant Date -
N/A
app pub date -
Mar 30, 2004
filing date -
Nov 26, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An adaptive pre-processing technique is provided to reduce perceptually unimportant information in a frame (such as some of the high frequency information) so as to optimize compression efficiency and to maximize perceived video quality of a compressed video sequence for a given bit rate. This pre-processing includes a combination of performing pre-filtering of video data to remove high frequency components and to smooth out high frequency texture information within object boundaries, based at least in part on human visual system characteristics. The technique is adaptive in that feedback regarding the current state of the encoder is used to change the filtering strength or region of support for subsequent frames, as needed, in order to maintain the bit budget while still generating visually acceptable video quality.
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