公开(公告)号：US10750169B2

公开(公告)日：2020-08-18

申请号：US16338511

申请日：2017-09-29

Applicant: MEDIATEK INC.

Inventor： Jungsun Kim ,  Xiaozhong Xu ,  Shan Liu

IPC: H04N19/11 ,  H04N19/186 ,  H04N19/159

Abstract: A method and apparatus for chroma Intra prediction are disclosed. According to one method, a chroma Intra mode set comprising more than six chroma Intra coding modes are generated and chroma Intra-prediction encoding or decoding is applied to the current chroma block using a current chroma Intra mode selected from the chroma Intra mode set. According to another method, a chroma MPM list is determined and a current chroma Intra mode is signaled using chroma MPM process at the video encoding system or parsing the current chroma Intra mode using the chroma MPM process at the video decoding system, where the chroma MPM process comprises using a chroma MPM flag to indicate whether the current chroma Intra mode belongs to the chroma MPM list.

公开(公告)号：US10542297B2

公开(公告)日：2020-01-21

申请号：US15912413

申请日：2018-03-05

Applicant: MediaTek Inc.

Inventor： Lulin Chen ,  Shan Liu

IPC: H04N21/00 ,  H04N21/234 ,  H03M13/00 ,  H04L29/06 ,  H04N21/236

Abstract: The techniques described herein relate to methods, apparatus, and computer readable media configured to perform an asset change for video data. First video data comprises a sequence of data units separated by data unit boundaries, and a sequence of error correction data units, wherein each error correction data unit is associated with one or more data units from the sequence of data units. Based on the received first video data, it can be determined whether an error correction data unit from the sequence of error correction data units associated with an asset change point of the first video data crosses one or more data unit boundaries of the first video data. Based on the determination, an asset change operation for the first video data and second video data is performed, wherein the second video data is different than the first video data.

公开(公告)号：US10531119B2

公开(公告)日：2020-01-07

申请号：US16203994

申请日：2018-11-29

Applicant: MediaTek Inc.

Inventor： Yu-Chen Sun ,  Jungsun Kim ,  Tzu-Der Chuang ,  Yi-Wen Chen ,  Wang Lin Lai ,  Shan Liu ,  Yu-Wen Huang

IPC: H04N19/182 ,  H04N19/593 ,  H04N19/124 ,  H04N19/176 ,  H04N19/186

Abstract: A method and apparatus for color index coding of a block of video data using index prediction based on reconstructed neighboring pixels are disclosed. In one embodiment, color index encoding or decoding is applied to the current pixel indices by deriving index prediction from neighboring pixel indices of the reconstructed neighboring pixels. The reconstructed neighboring pixel values are first transformed into the neighboring pixel indices according to a quantization table to map between major color indices and major color values of the current block. The quantization table can be based on a major color table for the current block or can also be derived at a decoder side. The decoding process may reconstruct the current pixels by converting decoded current pixel indices to reconstructed current pixel values according to the quantization table or by directly copying the reconstructed neighboring pixel values indicated by decoded current pixel indices.

公开(公告)号：US10375371B2

公开(公告)日：2019-08-06

申请号：US15647630

申请日：2017-07-12

Applicant: MediaTek Inc.

Inventor： Xiaozhong Xu ,  Shan Liu

IPC: H04N7/12 ,  H04N11/02 ,  H04N11/04 ,  H04N13/106 ,  H04N13/161 ,  H04N19/117 ,  H04N19/167 ,  H04N19/46 ,  H04N19/86 ,  G06T3/00 ,  H04N19/136 ,  H04N19/182 ,  H04N19/423

Abstract: A video system for encoding or decoding 360-degree virtual reality (360VR) video is provided. The system performs filtering operations to reduce coding artifacts and discontinuities in a projection image of an omnidirectional image. The video system identifies first and second edges of the projection image. The first and second edges are physically correlated as a common edge in the omnidirectional image but not physically connected in the projection image. The system computes a set of filtered pixels based on a first set of pixels near the first edge and a second set of pixels near the second edge.

公开(公告)号：US10313763B2

公开(公告)日：2019-06-04

申请号：US15660710

申请日：2017-07-26

Applicant: MEDIATEK INC.

Inventor： Wang Lin Lai ,  Shan Liu ,  Xin Wang

IPC: H04N21/81 ,  H04N7/01 ,  H04N21/2343 ,  H04N21/44

Abstract: Aspects of the disclosure provide an apparatus having an interface circuit, a processing circuit, and a display device. The interface circuit is configured to receive media presentation description information of media data. The media data includes video content on a two-dimensional (2D) plane that is projected from video content of a sphere surface. The video content on the 2D plane includes a plurality of segment streams having different coverages on the 2D plane. The media presentation description information uses projection based spatial relationship description (P-SRD) to describe the different coverages of the video content on the 2D plane according to the projection. The processing circuit is configured to determine one or more segment streams based on a region of interests for image generation and the P-SRD, select segments in the one or more segment streams, and cause the interface circuit to request and receive the selected segments.

公开(公告)号：US10205968B2

公开(公告)日：2019-02-12

申请号：US15545381

申请日：2016-02-03

Applicant: MEDIATEK INC.

Inventor： Shan Liu ,  Xiaozhong Xu ,  Tzu-Der Chuang ,  Yu-Chen Sun ,  Wang-Lin Lai ,  Yu-Wen Huang ,  Jing Ye

IPC: H04N19/93 ,  H04N19/593 ,  H04N19/70 ,  H04N19/182

Abstract: A method of palette index map coding of blocks in a picture by grouping coded symbols of the same type is disclosed for video encoder and decoder. In one embodiment, all syntax elements corresponding to the pixel index are grouped into a pixel index group, and all syntax elements corresponding to the escape pixel are grouped into an escape pixel group. All syntax elements corresponding to the run type and run length are grouped into an interleaved run type/run length group, or grouped into separate run type group and run length group. In another embodiment, the system parses from the video bitstream a last-run mode syntax element for a current block, where the last-run mode syntax element indicates whether a last run mode is a copy-index mode or a copy-above mode. Information associated with the last-run mode syntax element is used for reconstructing palette index map.

公开(公告)号：US10171834B2

公开(公告)日：2019-01-01

申请号：US15031878

申请日：2014-12-01

Applicant: MEDIATEK INC.

Inventor： Shan Liu ,  Xiaozhong Xu ,  Karen Yun Chang

IPC: H04N11/02 ,  H04N19/593 ,  H04N19/139 ,  H04N19/176 ,  H04N19/11 ,  H04N19/583 ,  H04N19/182 ,  H04N19/172

Abstract: Implementations of techniques of intra picture block copy in video compression are described. In one example implementation, a method may include: identifying a first block of pixels of a plurality of pixels of a picture as a reference block for reconstructing a second block of pixels of the plurality of pixels of the picture; determining an overlapped region of the second block that overlaps with the first block; and reconstructing pixels in the overlapped region based on a first set of pixels and a second set of pixels of the first block.

公开(公告)号：US20180109810A1

公开(公告)日：2018-04-19

申请号：US15730842

申请日：2017-10-12

Applicant: MEDIATEK INC.

Inventor： Xiaozhong Xu ,  Shan Liu

IPC: H04N19/62 ,  H04N19/52 ,  H04N19/573 ,  H04N19/176

CPC classification number: H04N19/62 ,  H04N19/105 ,  H04N19/11 ,  H04N19/17 ,  H04N19/176 ,  H04N19/52 ,  H04N19/573 ,  H04N19/597

Abstract: Methods and apparatus for coding a 360-degree VR image sequence are disclosed. According to one method, input data associated with a current image in the 360-degree VR image sequence are received and also a target reference picture associated with the current image is received. An alternative reference picture is then generated by extending pixels from spherical neighboring pixels of one or more boundaries related to the target reference picture. A list of reference pictures including the alternative reference picture is provided for encoding or decoding the current image. The process of extending the pixels may comprise directly copying one pixel region, padding the pixels with one rotated pixel region, padding pixels with one mirrored pixel region, or a combination thereof.

公开(公告)号：US20180035172A1

公开(公告)日：2018-02-01

申请号：US15660710

申请日：2017-07-26

Applicant: MEDIATEK INC.

Inventor： Wang Lin Lai ,  Shan Liu ,  Xin Wang

IPC: H04N21/81 ,  H04N21/44 ,  H04N7/01 ,  H04N21/2343

CPC classification number: H04N21/816 ,  H04N7/0117 ,  H04N21/234363 ,  H04N21/44008 ,  H04N21/8146

Abstract: Aspects of the disclosure provide an apparatus having an interface circuit, a processing circuit and a display device. The interface circuit is configured to receive media presentation description information of media data. The media data includes video content on a two-dimensional (2D) plane that is projected from video content of a sphere surface according to a projection. The video content on the 2D plane includes a plurality of segment streams having different coverages of the video content on the 2D plane. The media presentation description information uses projection based spatial relationship description (P-SRD) to describe the different coverages of the video content on the 2D plane according to the projection. The processing circuit is configured to determine one or more segment streams based on a region of interests for image generation and the P-SRD, select segments in the one or more segment streams, and cause the interface circuit to request and receive the selected segments.

公开(公告)号：US09661723B2

公开(公告)日：2017-05-23

申请号：US14836969

申请日：2015-08-27

Applicant: MEDIATEK INC.

Inventor： Chenghao Liu ,  Shan Liu

IPC: H05B33/08 ,  H05B37/02

CPC classification number: H05B37/0272 ,  H05B33/0845 ,  H05B33/0857 ,  Y02B20/46

Abstract: A method for controlling at least one lighting element includes: setting a dimming speed; determining a dimming level according to the dimming speed; and using the dimming level to perform a stepped dimming operation to brighten or dim the lighting element.