公开(公告)号：US11012692B2

公开(公告)日：2021-05-18

申请号：US15768450

申请日：2016-10-13

申请人： SISVEL TECHNOLOGY S.R.L.

发明人： Giulia Fracastoro ,  Enrico Magli

IPC分类号： H04N19/12 ,  H04N19/625 ,  H04N19/176 ,  H04N19/147 ,  H04N19/122 ,  H04N19/139 ,  H04N19/18 ,  H04N19/196 ,  H04N19/61

摘要： 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 (f{circumflex over ( )}) 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 (f{circumflex over ( )}) to the destination.