公开(公告)号：US09813737B2

公开(公告)日：2017-11-07

申请号：US14031436

申请日：2013-09-19

申请人： BLACKBERRY LIMITED

发明人： Jing Wang ,  Xiaofeng Wang ,  Dake He ,  Tianying Ji

IPC分类号： H04N19/61 ,  H04N19/13 ,  H04N19/157 ,  H04N19/91

CPC分类号： H04N19/61 ,  H04N19/13 ,  H04N19/157 ,  H04N19/91

摘要： Methods and devices for video coding are described. If an intra-prediction mode to be used in encoding a block of residual data is in a specific predetermined class, e.g., the horizontal class, then at least a portion of a quantized transformed block of residual data is transposed during encoding. Likewise, if an intra-prediction mode that was used to generate an encoded block of residual data is in such a class, then at least a portion of an entropy-decoded block of residual data is transposed during decoding.

公开(公告)号：US10291912B2

公开(公告)日：2019-05-14

申请号：US14760514

申请日：2013-01-16

申请人： BlackBerry Limited

发明人： Dake He ,  Tianying Ji ,  Jing Wang ,  Xiaofeng Wang

IPC分类号： H04N19/60 ,  H04N19/13 ,  H04N19/159 ,  H04N19/176 ,  H04N19/463 ,  H04N19/14 ,  H04N19/18 ,  H04N19/593 ,  H04N19/91 ,  H04N19/129

摘要： Methods and devices for encoding and decoding video using mode-dependent context determination in the case of level-run pair coding of transform coefficients are described. Intra-coding modes may be grouped into classes and each class may be associated with a partitioning of a coefficient group into regions. The region in which a coefficient falls determines, in part, the context selected for encoding bins associated with that coefficient, including a level, if the coefficient is non-zero, and a run if the coefficient correspond to the bin of a binarized run value.

公开(公告)号：US10412396B2

公开(公告)日：2019-09-10

申请号：US14759239

申请日：2013-01-16

申请人： Blackberry Limited

发明人： Dake He ,  Tianying Ji ,  Jing Wang ,  Xiaofeng Wang

IPC分类号： H04N19/18 ,  H04N19/60 ,  H04N7/16 ,  H04N19/13 ,  H04N19/147 ,  H04N19/126 ,  H04N19/19 ,  H04N19/93 ,  H04N19/129 ,  H04N19/91

摘要： Methods and devices for encoding and decoding video are described that partition transform blocks into coefficient groups. The coefficients within non-zero coefficients are run-length coded in a reverse scan order within the group. Prior to coefficient coding, data is encoded indicating which coefficient group in group scan order is the last to contain a non-zero coefficient. Then data is encoded indicating the position within that last non-zero coefficient group of the last non-zero coefficient in scan order inside the coefficient group. Thus the decoder is able to decode run-length data knowing the positions of the coefficients and eliminating the need for end-of-block flags.

公开(公告)号：US09215464B2

公开(公告)日：2015-12-15

申请号：US14031393

申请日：2013-09-19

申请人： BLACKBERRY LIMITED

发明人： Xiaofeng Wang ,  Jing Wang ,  Dake He ,  Tianying Ji

IPC分类号： G06K9/36 ,  H04N19/129 ,  H04N19/13 ,  H04N19/91 ,  H04N19/157 ,  H04N19/159 ,  H04N19/176 ,  H04N19/513

CPC分类号： H04N19/593 ,  H04N19/103 ,  H04N19/122 ,  H04N19/129 ,  H04N19/13 ,  H04N19/157 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/423 ,  H04N19/44 ,  H04N19/513 ,  H04N19/91

摘要： Methods and devices for video coding are described. When encoding a non-zero coefficient group (CG) prior to the last such group in a group scan ordering within a transform block, data representative of the true (x,y)-position of the last non-zero transform coefficient in a scan ordering within that CG is modified, to improve coding efficiency, based upon at least one of (a) an intra-prediction mode used to encode the block and (b) at least one coefficient group neighboring that CG. Upon decoding a CG thus encoded, the modification is un-done to retrieve the true (x,y)-position.

摘要翻译： 描述视频编码的方法和设备。 当在变换块内的组扫描排序中对最后一个这样的组之前的非零系数组（CG）进行编码时，表示扫描中最后非零变换系数的真（x，y）位的数据 根据（a）用于编码块的帧内预测模式和（b）与该CG相邻的至少一个系数组中的至少一个，修改该CG内的排序以提高编码效率。 在对由此编码的CG进行解码时，修改未完成以检索真（x，y）位。

公开(公告)号：US09681152B2

公开(公告)日：2017-06-13

申请号：US14942296

申请日：2015-11-16

申请人： BlackBerry Limited

发明人： Jing Wang ,  Xiaofeng Wang ,  Dake He ,  Tianying Ji

IPC分类号： G06K9/36 ,  H04N19/593 ,  H04N19/13 ,  H04N19/91 ,  H04N19/157 ,  H04N19/159 ,  H04N19/176 ,  H04N19/513 ,  H04N19/129 ,  H04N19/103 ,  H04N19/122 ,  H04N19/18 ,  H04N19/423 ,  H04N19/44

CPC分类号： H04N19/593 ,  H04N19/103 ,  H04N19/122 ,  H04N19/129 ,  H04N19/13 ,  H04N19/157 ,  H04N19/159 ,  H04N19/176 ,  H04N19/18 ,  H04N19/423 ,  H04N19/44 ,  H04N19/513 ,  H04N19/91

摘要： Methods and devices for video coding are described. When encoding a non-zero coefficient group (CG) prior to the last such group in a group scan ordering within a transform block, data representative of the true (x,y)-position of the last non-zero transform coefficient in a scan ordering within that CG is modified, to improve coding efficiency, based upon at least one of (a) an intra-prediction mode used to encode the block and (b) at least one coefficient group neighboring that CG. Upon decoding a CG thus encoded, the modification is un-done to retrieve the true (x,y)-position.