公开(公告)号：US20210203995A1

公开(公告)日：2021-07-01

申请号：US17134551

申请日：2020-12-28

Applicant: MEDIATEK INC.

Inventor： Ya-Hsuan Lee ,  Jian-Liang Lin

IPC: H04N19/70 ,  H04N19/597

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

公开(公告)号：US11049314B2

公开(公告)日：2021-06-29

申请号：US16802821

申请日：2020-02-27

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 ,  H04N19/124 ,  H04N19/86 ,  H04N19/176 ,  H04N19/154 ,  G06T19/00 ,  H04N19/597

Abstract: Methods and apparatus of processing 360-degree virtual reality images are disclosed. According to one method, the method receives coded data for an extended 2D (two-dimensional) frame including an encoded 2D frame with one or more encoded guard bands, wherein the encoded 2D frame is projected from a 3D (three-dimensional) sphere using a target projection, wherein said one or more encoded guard bands are based on a blending of one or more guard bands with an overlapped region when the overlapped region exists. The method then decodes the coded data into a decoded extended 2D frame including a decoded 2D frame with one or more decoded guard bands, and derives a reconstructed 2D frame from the decoded extended 2D frame.

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：US20200213570A1

公开(公告)日：2020-07-02

申请号：US16729514

申请日：2019-12-30

Applicant: MEDIATEK INC.

Inventor： Cheng-Hsuan Shih ,  Ya-Hsuan Lee ,  Jian-Liang Lin

IPC: H04N13/139 ,  H04N19/597 ,  H04N19/132 ,  H04N19/167 ,  H04N19/186

Abstract: A video processing method includes: receiving a part of a bitstream; decoding the part of the bitstream to generate a reconstructed projection-based frame with at least one projection face and at least one padding region packed in a projection layout of a 360-degree Virtual Reality (360 VR) projection; obtaining chroma sampling position information that is signaled via the bitstream; and performing a blending process for generating a blended chroma sample value at a target chroma sample position by blending a first chroma sample value obtained for a first chroma sample position in the at least one projection face and a second chroma sample value obtained for a second chroma sample position in the at least one padding region. At least one of the target chroma sample position, the first chroma sample position and the second chroma sample position is determined according to the chroma sampling position information.

公开(公告)号：US10593012B2

公开(公告)日：2020-03-17

申请号：US15927028

申请日：2018-03-20

Applicant: MEDIATEK INC.

Inventor： Ya-Hsuan Lee ,  Hung-Chih Lin ,  Jian-Liang Lin ,  Shen-Kai Chang

IPC: G06T3/00

Abstract: A video processing method includes receiving an omnidirectional content corresponding to a sphere, generating a projection-based frame according to at least the omnidirectional content and a segmented sphere projection (SSP) format, and encoding, by a video encoder, the projection-based frame to generate a part of a bitstream. The projection-based frame has a 360-degree content represented by a first circular projection face, a second circular projection face, and at least one rectangular projection face packed in an SSP layout. A north polar region of the sphere is mapped onto the first circular projection face. A south polar region of the sphere is mapped onto the second circular projection face. At least one non-polar ring-shaped segment between the north polar region and the south polar region of the sphere is mapped onto said at least one rectangular projection face.

公开(公告)号：US20190272617A1

公开(公告)日：2019-09-05

申请号：US16285215

申请日：2019-02-26

Applicant: MEDIATEK INC.

Inventor： Ya-Hsuan Lee ,  Jian-Liang Lin

IPC: G06T3/00

Abstract: A cube-based projection method includes generating pixels of different square projection faces associated with a cube-based projection of a 360-degree image content of a sphere. Pixels of a first square projection face are generated by utilizing a first mapping function set. Pixels of a second square projection face are generated by utilizing a second mapping function set. The different square projection faces include the first square projection face and the second square projection face. The second mapping function set is not identical to the first mapping function set.

公开(公告)号：US10356386B2

公开(公告)日：2019-07-16

申请号：US15766829

申请日：2018-04-03

Applicant: MEDIATEK INC.

Inventor： Ya-Hsuan Lee ,  Peng Wang ,  Jian-Liang Lin ,  Shen-Kai Chang

IPC: H04N13/161 ,  G06T3/00 ,  H04N13/111

Abstract: A video processing method includes obtaining projection face(s) from an omnidirectional content of a sphere, and obtaining a re-sampled projection face by re-sampling at least a portion of a projection face of the projection face(s) through non-uniform mapping. The omnidirectional content of the sphere is mapped onto the projection face(s) via a 360-degree Virtual Reality (360 VR) projection. The projection face has a first source region and a second source region. The re-sampled projection face has a first re-sampled region and a second re-sampled region. The first re-sampled region is derived from re-sampling the first source region with a first sampling density. The second re-sampled region is derived from re-sampling the second source region with a second sampling density that is different from the first sampling density.

公开(公告)号：US11659206B2

公开(公告)日：2023-05-23

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

CPC classification number: 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：US11494870B2

公开(公告)日：2022-11-08

申请号：US16639118

申请日：2018-08-17

Applicant: MEDIATEK INC.

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

IPC: G06T3/00 ,  H04N19/597 ,  H04N19/85 ,  G06T19/20 ,  H04N19/86

Abstract: An exemplary video processing method includes: receiving an omnidirectional content corresponding to a sphere; obtaining a plurality of projection faces from the omnidirectional content of the sphere according to a pyramid projection; creating at least one padding region; and generating a projection-based frame by packing the projection faces and the at least one padding region in a pyramid projection layout. The projection faces packed in the pyramid projection layout include a first projection face. The at least one padding region packed in the pyramid projection layout includes a first padding region. The first padding region connects with at least the first projection face, and forms at least a portion of one boundary of the pyramid projection layout.

公开(公告)号：US20210398245A1

公开(公告)日：2021-12-23

申请号：US17143164

申请日：2021-01-07

Applicant: MEDIATEK INC.

Inventor： Ya-Hsuan Lee ,  Jian-Liang Lin

IPC: G06T3/00 ,  H04N13/161 ,  G06T3/60

Abstract: A video processing method includes: decoding a part of a bitstream to generate a decoded frame, where the decoded frame is a projection-based frame that includes projection faces in a hemisphere cubemap projection layout; and remapping sample locations of the projection-based frame to locations on the sphere, where a sample location within the projection-based frame is converted into a local sample location within a projection face packed in the projection-based frame; in response to adjustment criteria being met, an adjusted local sample location within the projection face is generated by applying adjustment to one coordinate value of the local sample location within the projection face, and the adjusted local sample location within the projection face is remapped to a location on the sphere; and in response to the adjustment criteria not being met, the local sample location within the projection face is remapped to a location on the sphere.