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    Method and apparatus for encoding and decoding digital images or video streams
    6.
    发明授权
    Method and apparatus for encoding and decoding digital images or video streams 有权

    公开(公告)号：US11432012B2

    公开(公告)日：2022-08-30

    申请号：US16488851

    申请日：2018-03-02

    申请人： SISVEL TECHNOLOGY S.R.L.

    发明人： Marco Grangetto ,  Francesco Verdoja

    IPC分类号： H04N19/61 ,  H04N19/124 ,  H04N19/176 ,  H04N19/91 ,  H04N19/44

    摘要： A method for encoding digital images or video streams, includes a receiving phase, wherein a portion of an image is received; a graph weights prediction phase, wherein the elements of a weights matrix associated to the graph related to the blocks of the image (predicted blocks) are predicted on the basis of reconstructed, de-quantized and inverse-transformed pixel values of at least one previously coded block (predictor block) of the image, the weights matrix being a matrix comprising elements denoting the level of similarity between a pair of pixels composing said image, a graph transform computation phase, wherein the graph Fourier transform of the blocks of the image is performed, obtaining for the blocks a set of coefficients determined on the basis of the predicted weights; a coefficients quantization phase, wherein the coefficients are quantized an output phase wherein a bitstream comprising the transformed and quantized coefficients is transmitted and/or stored.

    Methods and apparatuses for encoding and decoding superpixel borders
    7.
    发明授权
    Methods and apparatuses for encoding and decoding superpixel borders 有权

    公开(公告)号：US10708601B2

    公开(公告)日：2020-07-07

    申请号：US16488879

    申请日：2018-03-02

    申请人： SISVEL TECHNOLOGY S.R.L.

    发明人： Marco Grangetto ,  Francesco Verdoja

    IPC分类号： H04N19/00 ,  H04N19/167 ,  H04N19/103 ,  H04N19/182 ,  G06T15/00 ,  G06T17/00

    摘要： The present invention relates to a method for encoding the borders of pixel regions of an image, wherein the borders contain a sequence of vertices subdividing the image into regions of pixels (superpixels), by generating a sequence of symbols from an alphabet including the step of: defining for each superpixel a first vertex for coding the borders of the superpixel according to a criterion common to all superpixels; defining for each superpixel the same coding order of the border vertices, either clockwise or counter-clockwise; defining the order for coding the superpixels on the base of a common rule depending on the relative positions of the first vertices; defining a set of vertices as a known border, wherein the following steps are performed for selecting a symbol of the alphabet, for encoding the borders of the superpixels: a) determining the first vertex of the next superpixel border individuated by the common criterion; b) determining the next vertex to be encoded on the basis of the coding direction; c) selecting a first symbol (“0”) for encoding the next vertex if the next vertex of a border pertains to the known border, d) selecting a symbol (“1”; “2”) different from the first symbol (“0”) if the next vertex is not in the known border; e) repeating steps b), c), d) and e) until all vertices of the superpixel border have been encoded; f) adding each vertex of the superpixel border that was not in the known border to the set; g) determining the next superpixel whose border is to be encoded according to the common rule, if any; i) repeating steps a)-g) until the borders of all the superpixels of the image have being added to the known border.