05764307 is referenced by 29 patents and cites 5 patents.

The present invention provides a method (200) and an apparatus (100) for spatially adaptive filtering for video encoding. The apparatus filters a video sequence prior the encoding process. The apparatus comprises a noise variance determiner (102), a local variance determiner (104), a noise visibility function determiner (106), a Gaussian kernel determiner (108), and a convolver (110). The apparatus removes noise directly from a Displaced Frame Difference, DFD, signal. This novel approach removes noise and miscellaneous high frequency components from the DFD signal without the introduction of the filtering artifacts characteristic of current techniques. By reducing the miscellaneous high frequency components, the present invention is capable of reducing the amount of information that must be encoded by the video encoder without substantially degrading the decoded video sequence.

Title
Method and apparatus for spatially adaptive filtering for video encoding
Application Number
8/506272
Publication Number
5764307
Application Date
July 24, 1995
Publication Date
June 9, 1998
Inventor
Cheung Auyeung
Hoffman Estates
IL, US
Ozan Erdogan
Davis
CA, US
Aggelos K Katsaggelos
Chicago
IL, US
James C Brailean
Park Ridge
IL, US
Taner Ozcelik
San Jose
CA, US
Agent
Darleen J Stockley
Assignee
Northwestern University
IL, US
Motorola
IL, US
IPC
H04N 5/21
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