Device and process for estimating noise level, noise reduction system and coding system comprising such a device
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United States of America Patent
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Apr 7, 2009
Grant Date -
Sep 16, 2004
app pub date -
Aug 6, 2002
filing date -
Aug 21, 2001
priority date (Note) -
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Abstract
The present invention relates to a device and a process for estimating the noise level of video images before coding. The device comprises in particular means of storage of at least one input image, a blockwise motion estimation module, designed to produce, blockwise, first quantities representative of motion-compensated image variations, on the basis of a current input image and of at least one input image stored previously in the said means of storage, means of estimation of a global noise level for each image as a function of at least certain of the said quantities representative of motion-compensated image variations, The said device comprises means of estimation of a local noise level for each block of the image as a function of second quantities representative of motion-compensated image variations and of the global noise level.
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