公开(公告)号：US10003803B1

公开(公告)日：2018-06-19

申请号：US15412818

申请日：2017-01-23

Applicant: MATROX GRAPHICS INC.

Inventor： Jean-Jacques Ostiguy ,  Simon Garneau ,  Bernard Antaki ,  Alain Champenois ,  Khalil Mawassi ,  Nicolas Jean

IPC: H04N11/02 ,  H04N19/124 ,  H04N19/172 ,  H04N19/51

CPC classification number: H04N19/124 ,  H04N19/137 ,  H04N19/172 ,  H04N19/176 ,  H04N19/51

Abstract: A method and apparatus for compressing a data stream comprising a plurality of pictures are described. A first quantization parameter (QP) from a plurality of QPs is determined, for a static region in a current picture. The plurality of QPs change in accordance with a multi-step change from a start QP to a target QP and each one of the plurality of QPs is to be applied to a respective one from successive static regions in successive pictures. In response to determining that the static region is to be compressed based upon an inter prediction mode, compression of the static region is caused based upon the first QP; and in response to determining that the static region is to be compressed based upon an intra prediction mode, compression of the static region is caused based upon a minimum QP.

公开(公告)号：US10003802B1

公开(公告)日：2018-06-19

申请号：US15412808

申请日：2017-01-23

Applicant: MATROX GRAPHICS INC.

Inventor： Jean-Jacques Ostiguy ,  Simon Garneau ,  Bernard Antaki ,  Alain Champenois ,  Mathieu Girard ,  Nicolas Jean

IPC: H04N11/02 ,  H04N19/124 ,  H04N19/177 ,  H04N19/51

CPC classification number: H04N19/124 ,  H04N19/137 ,  H04N19/176 ,  H04N19/177 ,  H04N19/51

Abstract: A method and apparatus for compressing a data stream comprising a plurality of pictures are described. A first quantization parameter (QP) from a plurality of QPs is determined, for a static region in a current picture. The plurality of QPs change in accordance with a multi-step change from a start QP to a target QP and each one of the plurality of QPs is to be applied to a respective one from successive static regions in successive pictures. In response to determining, based upon statistics on static region(s) in the current picture which are associated with the first QP, that the first QP is selected, compression of the static region is caused based upon the first QP, and in response to determining that the first QP is not selected, compression of the static region is caused based upon a second QP that is greater than the first QP.

公开(公告)号：US09621900B1

公开(公告)日：2017-04-11

申请号：US13670587

申请日：2012-11-07

Applicant: MATROX GRAPHICS INC.

Inventor： Jean-Jacques Ostiguy ,  Simon Garneau ,  Bernard Antaki ,  Alain Champenois

IPC: H04N7/32 ,  H04N19/136 ,  H04N19/61

CPC classification number: H04N19/136 ,  G06T1/60 ,  H04N19/13 ,  H04N19/184 ,  H04N19/42 ,  H04N19/423 ,  H04N19/43 ,  H04N19/433 ,  H04N19/439 ,  H04N19/463 ,  H04N19/517 ,  H04N19/61 ,  H04N19/70 ,  H04N19/88 ,  H04N19/91

Abstract: There is described herein motion-based adaptive quantization for compressing video streams. Motionless portions of pictures are detected and the compression quality of these portions is increased while the compression quality of non-motionless portions is decreased. The QP of a portion of image data, such as a macroblock, is modified for successive motionless portions from a start QP to a target QP in accordance with a multi-step change.