公开(公告)号：US20210337229A1

公开(公告)日：2021-10-28

申请号：US17372507

申请日：2021-07-11

Applicant: MEDIATEK INC.

Inventor： Ya-Hsuan Lee ,  Jian-Liang Lin

IPC: H04N19/44 ,  H04N19/132 ,  H04N19/169 ,  H04N19/186

Abstract: A video decoding method includes decoding a part of a bitstream to generate a decoded frame. The decoded frame is a projection-based frame that comprises at least one projection face and at least one guard band packed in a projection layout. At least a portion of a 360-degree content of a sphere is mapped to the at least one projection face via projection. The decoded frame is in a 4:2:0 chroma format or a 4:2:2 chroma format, and a guard band size of each of the at least one guard band is equal to an even number of luma samples.

公开(公告)号：US20210211736A1

公开(公告)日：2021-07-08

申请号：US17134196

申请日：2020-12-25

Applicant: MEDIATEK INC.

Inventor： Sheng-Yen Lin ,  Jian-Liang Lin

IPC: H04N19/82 ,  H04N19/117 ,  H04N19/597 ,  H04N19/132 ,  H04N19/184

Abstract: A video processing method includes receiving a reconstructed frame, and applying in-loop filtering, by at least one in-loop filter, to the reconstructed frame. The step of in-loop filtering includes performing a sample adaptive offset (SAO) filtering operation. The step of performing the SAO filtering operation includes keeping a value of a current pixel unchanged by blocking the SAO filtering operation of the current pixel included in the reconstructed frame from being applied across a virtual boundary defined in the reconstructed frame.

公开(公告)号：US10939118B2

公开(公告)日：2021-03-02

申请号：US16658173

申请日：2019-10-21

Applicant: MEDIATEK INC.

Inventor： Cheng-Hsuan Shih ,  Jian-Liang Lin

IPC: H04N19/136 ,  H04N19/115 ,  H04N19/176 ,  H04N19/80 ,  H04N19/186 ,  H04N19/117 ,  H04N19/149

Abstract: A luma-based chroma intra-prediction method includes: applying, by a filter circuit with a first weighting table, weighting to reconstructed luma samples to generate a first down-sampled luma sample, wherein the reconstructed luma samples are external to a luma block; computing parameters of a linear model, wherein a pair of the first down-sampled luma sample and a reconstructed chroma sample that is external to a chroma block is involved in computing the parameters of the linear model; and determining a predicted value of a chroma sample included in the chroma block according to the linear model and a second down-sampled luma sample that is derived from the luma block.

公开(公告)号：US20210006838A1

公开(公告)日：2021-01-07

申请号：US16917917

申请日：2020-07-01

Applicant: MEDIATEK INC.

Inventor： Ya-Hsuan Lee ,  Jian-Liang Lin

IPC: H04N19/70 ,  H04N19/184

Abstract: A video decoding method includes: decoding a part of a bitstream to generate a decoded frame, and parsing at least one syntax element from the bitstream. The decoded frame is a projection-based frame that includes projection faces packed in a cube-based projection layout. At least a portion of a 360-degree content of a sphere is mapped to the projection faces via cube-based projection. The at least one syntax element is indicative of a guard band configuration of the projection-based frame.

公开(公告)号：US20200252650A1

公开(公告)日：2020-08-06

申请号：US16856069

申请日：2020-04-23

Applicant: MEDIATEK INC.

Inventor： Cheng-Hsuan Shih ,  Shen-Kai Chang ,  Jian-Liang Lin ,  Hung-Chih Lin

IPC: H04N19/597 ,  H04N19/46 ,  H04N19/82 ,  H04N19/513 ,  H04N19/593 ,  H04N19/105 ,  H04N19/167 ,  H04N19/59 ,  H04N19/117 ,  H04N19/176

Abstract: A video processing method includes: receiving a bitstream, wherein a part of the bitstream transmits encoded information of a projection-based frame that has a 360-degree content represented by projection faces packed in a 360-degree Virtual Reality (360 VR) projection layout, and the projection-based frame has at least one boundary; and decoding, by a video decoder, the part of the bitstream, including: generating a reconstructed frame, parsing a flag from the bitstream, and applying an in-loop filtering operation to the reconstructed frame. The flag indicates that the in-loop filtering operation is blocked from being applied to each of said at least one boundary in the reconstructed frame. In response to the flag, the in-loop filtering operation is blocked from being applied to each of the at least one boundary in the reconstructed frame.

公开(公告)号：US20190325553A1

公开(公告)日：2019-10-24

申请号：US16460958

申请日：2019-07-02

Applicant: MEDIATEK INC.

Inventor： Hung-Chih Lin ,  Chao-Chih Huang ,  Chia-Ying Li ,  Hui Ou Yang ,  Jian-Liang Lin ,  Shen-Kai Chang

IPC: G06T3/00 ,  G02B27/01 ,  G06T1/00 ,  G06T19/00

Abstract: A video processing method includes receiving a bitstream, and decoding, by a video decoder, the bitstream to generate a decoded frame. The decoded frame is a projection-based frame that has a 360-degree image/video content represented by triangular projection faces packed in an octahedron projection layout. An omnidirectional image/video content of a viewing sphere is mapped onto the triangular projection faces via an octahedron projection of the viewing sphere. An equator of the viewing sphere is not mapped along any side of each of the triangular projection faces.

公开(公告)号：US20190281293A1

公开(公告)日：2019-09-12

申请号：US16296231

申请日：2019-03-08

Applicant: MEDIATEK INC.

Inventor： Sheng-Yen Lin ,  Jian-Liang Lin ,  Cheng-Hsuan Shih

IPC: H04N19/117 ,  H04N19/14 ,  H04N19/182 ,  H04N19/52

Abstract: A de-blocking method is applied to a reconstructed projection-based frame having a first projection face and a second projection face, and includes obtaining a first spherical neighboring block for a first block with a block edge to be de-blocking filtered, and selectively applying de-blocking to the block edge of the first block for at least updating a portion of pixels of the first block. There is image content discontinuity between a face boundary of the first projection face and a face boundary of the second projection face. The first block is a part of the first projection face, and the block edge of the first block is a part of the face boundary of the first projection face. A region on a sphere to which the first spherical neighboring block corresponds is adjacent to a region on the sphere from which the first projection face is obtained.

公开(公告)号：US20190281273A1

公开(公告)日：2019-09-12

申请号：US16296187

申请日：2019-03-07

Applicant: MEDIATEK INC.

Inventor： Sheng-Yen Lin ,  Jian-Liang Lin

IPC: H04N13/161 ,  H04N19/117 ,  H04N19/82 ,  H04N19/167 ,  H04N19/176 ,  H04N19/597

Abstract: An adaptive loop filtering (ALF) method for a reconstructed projection-based frame includes: obtaining at least one spherical neighboring pixel in a padding area that acts as an extension of a face boundary of a first projection face, and applying adaptive loop filtering to a block in the first projection face. In the reconstructed projection-based frame, there is image content discontinuity between the face boundary of the first projection face and a face boundary of a second projection face. A region on the sphere to which the padding area corresponds is adjacent to a region on the sphere from which the first projection face is obtained. The at least one spherical neighboring pixel is involved in the adaptive loop filtering of the block.

公开(公告)号：US10380715B2

公开(公告)日：2019-08-13

申请号：US15825081

申请日：2017-11-28

Applicant: MEDIATEK INC.

Inventor： Hung-Chih Lin ,  Chao-Chih Huang ,  Chia-Ying Li ,  Hui Ou Yang ,  Jian-Liang Lin ,  Shen-Kai Chang

IPC: G06T3/00 ,  G06T3/60 ,  G06T19/00 ,  G06T1/00 ,  G02B27/01

Abstract: A video processing method includes: receiving an omnidirectional image/video content corresponding to a viewing sphere, generating a sequence of projection-based frames according to the omnidirectional image/video content and an octahedron projection layout, and encoding, by a video encoder, the sequence of projection-based frames to generate a bitstream. Each projection-based frame has a 360-degree image/video content represented by triangular projection faces packed in the octahedron projection layout. The omnidirectional image/video content of the viewing sphere is mapped onto the triangular projection faces via an octahedron projection of the viewing sphere. An equator of the viewing sphere is not mapped along any side of each of the triangular projection faces.

公开(公告)号：US20190026858A1

公开(公告)日：2019-01-24

申请号：US16143410

申请日：2018-09-26

Applicant: MEDIATEK INC.

Inventor： Jian-Liang Lin ,  Peng Wang ,  LIN LIU ,  Ya-Hsuan Lee ,  Hung-Chih Lin ,  Shen-Kai Chang

IPC: G06T3/00 ,  G06T19/00 ,  H04N19/182

Abstract: A video processing method includes: obtaining a plurality of projection faces from an omnidirectional content of a sphere, wherein the omnidirectional content of the sphere is mapped onto the projection faces via cubemap projection, and the projection faces comprise a first projection face; obtaining, by a re-sampling circuit, a first re-sampled projection face by re-sampling at least a portion of the first projection face through non-uniform mapping; generating a projection-based frame according to a projection layout of the cubemap projection, wherein the projection-based frame comprises the first re-sampled projection face packed in the projection layout; and encoding the projection-based frame to generate a part of a bitstream.