公开(公告)号：US11765349B2

公开(公告)日：2023-09-19

申请号：US16557686

申请日：2019-08-30

Applicant: MEDIATEK INC.

Inventor： Sheng Yen Lin ,  Lin Liu ,  Jian-Liang Lin

IPC: H04N19/117 ,  H04N19/172 ,  H04N19/70 ,  H04N19/61

CPC classification number: H04N19/117 ,  H04N19/172 ,  H04N19/61 ,  H04N19/70

Abstract: Method and apparatus of coding pictures containing one or more virtual boundaries, such as 360-degree virtual reality (VR360) video are disclosed. According to this method, a reconstructed filtered unit associated with a loop filter for a current reconstructed pixel is received. The loop filtering process associated with the loop filter is applied to the current reconstructed pixel to generate a filtered reconstructed pixel, where if the loop filtering process for the current reconstructed pixel is across a virtual boundary of the picture, the loop filtering process is disabled when fixed-size loop filtering is used or a smaller-size loop filter is selected when adaptive-size loop filtering is used for the current reconstructed pixel, where the filtered reconstructed pixel is the same as the current reconstructed pixel when the loop filtering process is disabled. The filtered reconstructed pixel is the same as the current reconstructed pixel.

公开(公告)号：US11089335B2

公开(公告)日：2021-08-10

申请号：US16737377

申请日：2020-01-08

Applicant: MEDIATEK INC.

Inventor： Sheng Yen Lin ,  Jian-Liang Lin ,  Lin Liu

IPC: H04N19/70 ,  H04N19/176 ,  H04N19/46 ,  H04N19/117

Abstract: Method and apparatus of coding a video sequence are disclosed. According to this method, a first syntax is signalled in or parsed from a bitstream, where the first syntax indicates whether a loop filtering process is disabled for one or more virtual boundaries in a corresponding region. A reconstructed filter unit in a current picture is received, wherein the reconstructed filter unit is associated with the loop filter and the reconstructed filter unit comprises reconstructed pixels for applying a loop filtering process associated with the loop filter to a current reconstructed pixel. When the first syntax is true, the loop filter processing is disabled when the reconstructed filter unit is across said one or more virtual boundaries in the corresponding region. When the first syntax is false, the loop filter processing is not disabled when the reconstructed filter unit is across the virtual boundary.

公开(公告)号：US11094088B2

公开(公告)日：2021-08-17

申请号：US16557643

申请日：2019-08-30

Applicant: MEDIATEK INC.

Inventor： Sheng Yen Lin ,  Lin Liu ,  Jian-Liang Lin

IPC: G06K9/00 ,  G06T9/00 ,  G06T3/40 ,  G06T19/00 ,  H04N19/186 ,  H04N19/105 ,  H04N19/172 ,  H04N19/117

Abstract: Methods and apparatus of coding a video sequence, wherein pictures from the video sequence contain one or more discontinuous edges are disclosed. The loop filtering process associated with the loop filter is then applied to the current reconstructed pixel to generate a filtered reconstructed pixel, where if the loop filtering process is across a virtual boundary of the current picture, one or more alternative reference pixels are used to replace unexpected reference pixels located in a different side of the virtual boundary from the current reconstructed pixel, and said one or more alternative reference pixels are generated from second reconstructed pixels in a same side of the virtual boundary as the current reconstructed pixel. According to another method, reference pixels are derived from spherical neighbouring reference pixels for the loop filtering process.

公开(公告)号：US11004173B2

公开(公告)日：2021-05-11

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: H04N19/182 ,  H04N19/59 ,  G06T11/00 ,  G06T3/00 ,  G06T19/00 ,  H04N19/597 ,  H04N19/55 ,  H04N19/86

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.

公开(公告)号：US10986371B2

公开(公告)日：2021-04-20

申请号：US16361213

申请日：2019-03-22

Applicant: MEDIATEK INC.

Inventor： Sheng-Yen Lin ,  Lin Liu ,  Jian-Liang Lin

IPC: H04N19/597 ,  H04N19/117 ,  H04N19/176 ,  G06K9/62

Abstract: A sample adaptive offset (SAO) filtering method for a reconstructed projection-based frame includes: obtaining at least one padding pixel in a padding area that acts as an extension of a face boundary of a first projection face, and applying SAO filtering to a block that has at least one pixel included 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. The at least one padding pixel is involved in the SAO filtering of the block.