公开(公告)号：US20190289316A1

公开(公告)日：2019-09-19

申请号：US16354303

申请日：2019-03-15

Applicant: MEDIATEK INC.

Inventor： Cheng-Hsuan SHIH ,  Jian-Liang LIN

IPC: H04N19/52 ,  H04N19/176

Abstract: Method and apparatus of coding 360-degree virtual reality (VR360) pictures are disclosed. According to the method, when a first MV (motion vector) of a target neighboring block for the current block is not available within the 2D projection picture, or when the target neighboring block is not in a same face as the current block: a true neighboring block picture corresponding to the target neighboring block is identified within the 2D projection; if a second MV of the true neighboring block exists, the second MV of the true neighboring block is transformed into a derived MV; and a current MV of the current block is encoded or decoded using the derived MV or one selected candidate in a MV candidate list including the derived MV as an MV predictor.

公开(公告)号：US20190082183A1

公开(公告)日：2019-03-14

申请号：US16127954

申请日：2018-09-11

Applicant: MEDIATEK INC.

Inventor： Cheng-Hsuan SHIH ,  Jian-Liang LIN

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/172 ,  H04N19/124 ,  H04N19/182 ,  H04N19/44 ,  H04N19/625

Abstract: Methods for processing 360-degree virtual reality images are disclosed. According to one method, coding flags for the target block are skipped for inactive blocks at an encoder side or pixels for the target block are derived based on information identifying the target block being the inactive block at a decoder side. According to another method, when a target block is partially filled with inactive pixels, the best predictor is selected using rate-distortion optimization, where distortion associated with the rate-distortion optimization is measured by excluding inactive pixels of the target block. According to another method, the inactive pixels of a residual block are padded with values to achieve the best rate-distortion optimization. According to another method, active pixels of the residual block are rearranged into a smaller block and coding is applied to the smaller block, or shape-adaptive transform coding is applied to the active pixels of the residual block.

公开(公告)号：US20200322631A1

公开(公告)日：2020-10-08

申请号：US16910374

申请日：2020-06-24

Applicant: MEDIATEK INC.

Inventor： Cheng-Hsuan SHIH ,  Jian-Liang LIN

IPC: H04N19/597 ,  H04N19/176 ,  H04N19/119 ,  H04N19/96

Abstract: Methods and apparatus of processing 360-degree virtual reality (VR360) pictures are disclosed. According to one method, if a leaf coding unit contains one or more face edges, the leaf processing unit is split into sub-processing units along the face edges without the need to signal the partition. In another method, if the quadtree (QT) of binary tree (BT) partition depth for a processing unit has not reached the maximum QT or BT depth, the processing unit is split. If the processing unit contains a horizontal face edge, QT or horizontal BT partition is applied. If the processing unit contains a vertical face edge, QT or vertical BT partition is applied.

公开(公告)号：US20190289328A1

公开(公告)日：2019-09-19

申请号：US16299320

申请日：2019-03-12

Applicant: MEDIATEK INC.

Inventor： Cheng-Hsuan SHIH ,  Jian-Liang LIN

IPC: H04N19/597 ,  H04N19/96 ,  H04N19/119 ,  H04N19/176

Abstract: Methods and apparatus of processing 360-degree virtual reality (VR360) pictures are disclosed. According to one method, if a leaf coding unit contains one or more face edges, the leaf processing unit is split into sub-processing units along the face edges without the need to signal the partition. In another method, if the quadtree (QT) of binary tree (BT) partition depth for a processing unit has not reached the maximum QT or BT depth, the processing unit is split. If the processing unit contains a horizontal face edge, QT or horizontal BT partition is applied. If the processing unit contains a vertical face edge, QT or vertical BT partition is applied.

公开(公告)号：US20190026934A1

公开(公告)日：2019-01-24

申请号：US16034601

申请日：2018-07-13

Applicant: MEDIATEK INC.

Inventor： Cheng-Hsuan SHIH ,  Chia-Ying LI ,  Ya-Hsuan LEE ,  Hung-Chih LIN ,  Jian-Liang LIN ,  Shen-Kai CHANG

IPC: G06T15/00

Abstract: Methods and apparatus of processing 360-degree virtual reality images are disclosed. According to one method, a 2D (two-dimensional) frame is divided into multiple blocks. The multiple blocks are encoded or decoded using quantization parameters by restricting a delta quantization parameter to be within a threshold for any two blocks corresponding to two neighboring blocks on a 3D sphere. According to another embodiment, one or more guard bands are added to one or more edges that are discontinuous in the 2D frame but continuous in the 3D sphere. Fade-out process is applied to said one or more guard bands to generate one or more faded guard bands. At the decoder side, the reconstructed 2D frame is generated from the decoded extended 2D frame by cropping said one or more decoded faded guard bands or by blending said one or more decoded faded guard bands and reconstructed duplicated areas.