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公开(公告)号:EP3354030A1
公开(公告)日:2018-08-01
申请号:EP16781200.7
申请日:2016-09-23
Applicant: Sisvel Technology S.r.l.
Inventor: FRACASTORO, Giulia , MAGLI, Enrico , VERDOJA, Francesco , GRANGETTO, Marco
CPC classification number: H04N19/60 , G06K9/34 , G06K9/6224 , G06T7/11 , H04N19/17 , H04N19/182
Abstract: A method and an apparatus for encoding and/or decoding digital images or video streams are provided, wherein the encoding apparatus includes a processor configured for reading at least a portion of the image, segmenting the portion of the image in order to obtain groups of pixels identified by borders information and containing at least two pixels having one or more homogeneous characteristics, computing, for each group of pixels, a weight map on the basis of the borders information associated to the group of pixels, a graph transform matrix on the basis of the weight map, and transform coefficients on the basis of the graph transform matrix (U) and of the pixels contained in the group of pixels.