DETECTION AND REDUCTION OF RINGING ARTIFACTS BASED ON BLOCK-GRID POSITION AND OBJECT EDGE LOCATION
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United States of America Patent
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Issued Date -
Jan 7, 2010
app pub date -
Sep 17, 2007
filing date -
Sep 20, 2006
priority date (Note) -
Abandoned
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Abstract
The invention proposes a method (FIG. 2) and respective devices (FIG. 2) and software for an algorithm to detect and remove ringing artefacts and mosquito noise in decompressed pictures and video. The proposed idea is based on the observation that ringing is spatially localized within a block, which contains at least a part of an object edge, in particular a strong object edge. Blocks affected by ringing are detected by analyzing (1) a block grid position, location (2) of an object edge and by comparing (7) local spatial activities (Act af, Act nor) of adjacent blocks, i.e. affected blocks and nor) not-affected blocks.
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