公开(公告)号：US20200296401A1

公开(公告)日：2020-09-17

申请号：US16813965

申请日：2020-03-10

Applicant: MEDIATEK INC.

Inventor： Ya-Hsuan LEE ,  Jian-Liang LIN

IPC: H04N19/46 ,  G06T3/40 ,  G06T9/00 ,  G06T5/00 ,  G06T5/20 ,  G06T7/50

Abstract: Methods and apparatus of video coding for 3D video data are disclosed. According to one method, the gradients of the geometry frame are derived. A reconstructed point cloud is reconstructed using the geometry frame. One or more candidate holes in the reconstructed point cloud are filled based on the gradients of the geometry frame. According to another method of encoding for 3D video data, candidate hole locations in a geometry frame, patch or layer are determined. Source points projected to the candidate hole locations are grouped to generate grouped points. The grouped points are removed from an original patch containing the grouped points.

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.

公开(公告)号：US20200074587A1

公开(公告)日：2020-03-05

申请号：US16607505

申请日：2018-04-20

Applicant: MEDIATEK INC.

Inventor： Ya-Hsuan LEE ,  Jian-Liang LIN ,  Shen-Kai CHANG

IPC: G06T3/00

Abstract: Methods and apparatus of processing spherical images related to segmented sphere projection (SSP) are disclosed. According to one method, a North Pole region of the spherical image is projected to a first circular image and a South Pole region of the spherical image is projected to a second circular image using a mapping process selected from a mapping group comprising equal-area mapping, non-uniform mapping and cubemap mapping. Methods and apparatus of processing spherical images related to rotated sphere projection (RSP) are also disclosed. According to this method, the spherical image is projected into a first part of rotated sphere projection corresponding to a θ×φ region of the spherical image and a second part of rotated sphere projection corresponding to a remaining part of the spherical image using equal-area mapping.

公开(公告)号：US20180338160A1

公开(公告)日：2018-11-22

申请号：US15976313

申请日：2018-05-10

Applicant: MEDIATEK INC.

Inventor： Ya-Hsuan LEE ,  Jian-Liang LIN ,  Shen-Kai CHANG

IPC: H04N19/597 ,  H04N19/86 ,  H04N13/139 ,  H04N13/117 ,  G06T7/13 ,  G06T7/174

Abstract: Methods and apparatus of processing 360-degree virtual reality images are disclosed. According to one method, each 360-degree virtual reality image is projected into one first projection picture using first projection-format conversion. The first projection pictures are encoded and decoded into first reconstructed projection pictures. Each first reconstructed projection picture is then projected into one second reconstructed projection picture or one third reconstructed projection picture corresponding to a selected viewpoint using second projection-format conversion. One or more discontinuous edges in one or more second reconstructed projection pictures or one or more third reconstructed projection pictures corresponding to the selected viewpoint are identified. A post-processing filter is then applied to at least one discontinuous edge in the second reconstructed projection pictures or third reconstructed projection pictures corresponding to the selected viewpoint to generate filtered output.