Image filter device, decoding apparatus, encoding apparatus, and data structure
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United States of America Patent
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Mar 31, 2015
Grant Date -
May 30, 2013
app pub date -
Jun 2, 2011
filing date -
Jun 17, 2010
priority date (Note) -
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Abstract
An adaptive filter includes: an edge direction detection section which discriminates directionality of an input image in each of a plurality of unit regions constituting the input image; a region classification section which classifies the each of the plurality of unit regions into one of a plurality of unit region groups in accordance with to which of a plurality of predetermined groups the directionality of the input image in the each of the plurality of unit regions belongs, the directionality having been discriminated by the edge direction detection section; and a filter process section which calculates a pixel value of the each pixel of an output image by use of a filter coefficient group optimized for a unit region group to which a unit region including the each pixel belongs.
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