公开(公告)号：WO2017046750A1

公开(公告)日：2017-03-23

申请号：PCT/IB2016/055526

申请日：2016-09-16

Applicant: SISVEL TECHNOLOGY S.R.L. ,  POLITECNICO DI TORINO

Inventor： FRACASTORO, Giulia ,  MAGLI, Enrico

IPC: H04N19/12 ,  H04N19/14 ,  H04N19/176 ,  G06T9/20

CPC classification number: H04N19/12 ,  B29C2947/92209 ,  B29C2947/924 ,  H04N19/14 ,  H04N19/176 ,  H04N19/463 ,  H04N19/90

Abstract: The present invention relates to methods and apparatuses for encoding and/or decoding digital images or video streams, wherein the encoding apparatus (1100) comprises processing means (1110) configured for reading a portion of said image (f), computing difference values between pixel values of the image, quantizing such pixel difference values for obtaining a quantized weight map (W), computing an edge map (f') composed by elements (f'i) indicating whether a corresponding pixel of said portion of the image is an edge or not on the basis of the quantized weight map, determining a reconstructed weight map (W') on the basis of the edge map (f'), determining a graph transform matrix (U) on the basis of the reconstructed weight map (W'), computing transform coefficients (f^) on the basis of the graph transform matrix (U) and said portion of the image (f), transmitting the computed transform coefficients (f^) and the edge map (f').

Abstract translation: 本发明涉及用于编码和/或解码数字图像或视频流的方法和装置，其中编码装置（1100）包括被配置用于读取所述图像（f）的一部分的处理装置（1110），计算像素 对所述图像的值进行量化，以获得量化权重映射（W）量化所述像素差值，计算由表示所述图像的所述部分的相应像素是否为边缘的元素（f'）组成的边缘图（f'） 或者不基于量化权重图，基于边缘图（f'）确定重构权重映射（W'），基于重构的权重映射（W）来确定图形变换矩阵（U） '），基于图形变换矩阵（U）和图像（f）的所述部分计算变换系数（f ^），发送计算出的变换系数（f ^）和边缘图（f'）。

公开(公告)号：EP3363202A1

公开(公告)日：2018-08-22

申请号：EP16791692.3

申请日：2016-10-13

Applicant: Sisvel Technology S.r.l.

Inventor： FRACASTORO, Giulia ,  MAGLI, Enrico

IPC: H04N19/625

CPC classification number: H04N19/12 ,  H04N19/122 ,  H04N19/139 ,  H04N19/147 ,  H04N19/176 ,  H04N19/18 ,  H04N19/196 ,  H04N19/61 ,  H04N19/625

Abstract: A method and an apparatus are provided for encoding and/or decoding digital images or video streams. The encoding apparatus includes a processor configured for reading at least a portion of an image (f), determining a rotation angle (θ) on the basis of the portion of the image (f), determining rotated transform matrix (V′) which is the result of a rotation of at least one basis vector of a Discrete Cosine Transform matrix (V) by the rotation angle (θ), computing transformed coefficients (f̂) on the basis of the pixel values contained in the portion of the image (f) and the rotated transform information (V′), outputting the transformed coefficients (f̂) to the destination.

公开(公告)号：EP3350992A1

公开(公告)日：2018-07-25

申请号：EP16779187.0

申请日：2016-09-16

Applicant: Sisvel Technology S.r.l.

Inventor： FRACASTORO, Giulia ,  MAGLI, Enrico

IPC: H04N19/12 ,  H04N19/14 ,  H04N19/176 ,  G06T9/20

CPC classification number: H04N19/126 ,  B29C2947/92209 ,  B29C2947/924 ,  H04N19/12 ,  H04N19/14 ,  H04N19/176 ,  H04N19/182 ,  H04N19/463 ,  H04N19/60 ,  H04N19/90

Abstract: Methods and apparatuses for encoding and/or decoding digital images or video streams, wherein the encoding apparatus includes a processor configured for reading a portion of the image (f), computing difference values between pixel values of the image, quantizing such pixel difference values for obtaining a quantized weight map (W), computing an edge map (f′) composed by elements (f′i) indicating whether a corresponding pixel of the portion of the image is an edge or not on the basis of the quantized weight map, determining a reconstructed weight map (W′) on the basis of the edge map (f′), determining a graph transform matrix (U) on the basis of the reconstructed weight map (W′), computing transform coefficients (f̂) on the basis of the graph transform matrix (U) and said portion of the image (f), transmitting the computed transform coefficients (f̂) and the edge map (f′).

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

IPC: H04N19/60 ,  H04N19/17 ,  G06T9/00 ,  G06K9/62 ,  G06T7/00

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.