公开(公告)号：US11039147B2

公开(公告)日：2021-06-15

申请号：US16304207

申请日：2017-05-26

Applicant: MEDIATEK INC.

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

IPC: H04N19/157 ,  H04N19/11 ,  H04N19/186 ,  H04N19/129 ,  H04N19/176 ,  H04N19/119

Abstract: Methods and apparatus for a coding system using palette mode coding for colour video are disclosed. According to method, when the palette mode is enabled, separate coding of luma and chroma components is disabled or if separate coding of luma and chroma components, the palette mode is disabled. According to another method, when the palette mode is enabled for the current image, palette mode coding is only applied to the luma blocks and non-palette mode coding is applied to the chroma blocks. According to yet another method, palette mode coding is applied to the luma blocks using luma palettes if the palette mode is selected for the luma blocks and palette mode coding applying to the chroma blocks using chroma palettes if the palette mode is selected for the chroma blocks. According to yet another method, the scan direction for a non-square CU depends on the shape of the non-square.

公开(公告)号：US10897631B2

公开(公告)日：2021-01-19

申请号：US16540141

申请日：2019-08-14

Applicant: MEDIATEK INC.

Inventor： Tzu-Der Chuang ,  Shan Liu ,  Xiaozhong Xu

IPC: H04N19/593 ,  H04N19/176 ,  H04N19/105 ,  H04N19/159 ,  H04N19/11 ,  H04N19/70 ,  H04N19/51

Abstract: A method and apparatus for video coding operates by receiving input data associated with a current block in a current picture, determining restricted prediction based on whether IntraBC prediction (Intra Block Copy prediction) is included in a plurality of candidate coding modes, wherein said determining the restricted prediction comprising disabling or disallowing selected prediction for one or more selected PU (prediction unit) sizes, PU prediction types or both, and applying video coding to the current block using the candidate coding modes including IntraBC prediction (Intra Block Copy prediction) in accordance with the restricted prediction.

公开(公告)号：US10575013B2

公开(公告)日：2020-02-25

申请号：US15766921

申请日：2016-10-18

Applicant: MEDIATEK INC.

Inventor： Shan Liu ,  Xiaozhong Xu

IPC: H04N19/593 ,  H04N19/105 ,  H04N19/159 ,  H04N19/172 ,  H04N19/423 ,  H04N19/70

Abstract: Method and apparatus of managing a DPB (decoded picture buffer) for a video coding system are disclosed. Whether the IntraBC mode is used for a current picture is determined and a maximum allowed number of decoded pictures in the DPB is allocated based on whether the IntraBC mode is used for the current picture. The current picture is then encoded or decoded using decoded pictures stored in the DPB as reference data. In another method, a maximum number of reordered pictures in the DPB is determined. If certain conditions are true, one or more decoded pictures stored in the DPB will be emptied until none of the conditions is true. One condition corresponds to a number of decoded pictures in the DPB marked as “needed for output” being greater than the maximum number of reordered picture modified according to whether the IntraBC mode is used for the current picture.

公开(公告)号：US10397569B2

公开(公告)日：2019-08-27

申请号：US15611850

申请日：2017-06-02

Applicant: MEDIATEK INC.

Inventor： Shan Liu ,  Jing Ye ,  Xiaozhong Xu ,  Tzu-Der Chuang ,  Ching-Yeh Chen

IPC: H04N19/00 ,  H04N19/11 ,  H04N19/156 ,  H04N19/176 ,  H04N19/593 ,  H04N19/82 ,  H04N19/147 ,  H04N19/463

Abstract: A method and apparatus for video coding using template-based Intra prediction are disclosed. According to one method, the template-based Intra prediction searches N template matching candidates to reduce the complexity. In another method, the template-based Intra prediction assigns different weights for different pixel locations of template or uses different pixel precision for interpolation filter during cost evaluation among template matching candidates. In yet another method, truncated template size is used to reduce the complexity. In yet another method, the left and top templates may have different sizes for non-square block. In yet another method, inverse templated-based Intra prediction is used.

公开(公告)号：US10390021B2

公开(公告)日：2019-08-20

申请号：US15458446

申请日：2017-03-14

Applicant: MEDIATEK INC.

Inventor： Xiaozhong Xu ,  Shan Liu

IPC: H04N19/11 ,  H04N19/105 ,  H04N19/159 ,  H04N19/172 ,  H04N19/176 ,  H04N19/182 ,  H04N19/186

Abstract: Aspects of the disclosure include a method for video coding. The method includes receiving input data associated with a current block in an image frame, selecting a reference pixel set from a plurality of candidate neighboring pixel sets adjacent to an edge of the current block, generating an intra predictor of the current block based on the selected reference pixel set and an intra prediction mode of the current block, and encoding or decoding the current block based on the intra predictor to output encoded video data or a decoded block. Each set of the candidate neighboring pixel sets is arranged in parallel with the edge of the current block.

公开(公告)号：US20180338154A1

公开(公告)日：2018-11-22

申请号：US15966570

申请日：2018-04-30

Applicant: MEDIATEK INC.

Inventor： Han HUANG ,  Xiaozhong Xu ,  Tzu-Der Chuang

IPC: H04N19/517 ,  H04N19/105 ,  H04N19/176

Abstract: Aspects of the disclosure include a video decoding device that includes a processing circuit. The processing circuit is configured to receive encoded video data associated with a current block of a current image frame, determine a set of candidate motion vectors for the current block, determine a selection index based on the encoded video data, and select one of the set of candidate motion vectors based on the selection index. The processing circuit is further configured to refine the selected candidate motion vector to become a reconstructed motion vector when the selected candidate motion vector meets a predetermined condition, and generate an image of the current image frame for output, including generating a reconstructed image of the current block based on the reconstructed motion vector.

公开(公告)号：US20180020202A1

公开(公告)日：2018-01-18

申请号：US15647630

申请日：2017-07-12

Applicant: MediaTek Inc.

Inventor： Xiaozhong Xu ,  Shan Liu

IPC: H04N13/00 ,  H04N19/46 ,  H04N19/167 ,  H04N19/86 ,  H04N19/117

CPC classification number: H04N13/106 ,  G06T3/0025 ,  H04N13/161 ,  H04N19/117 ,  H04N19/136 ,  H04N19/167 ,  H04N19/182 ,  H04N19/423 ,  H04N19/46 ,  H04N19/86

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：US11089323B2

公开(公告)日：2021-08-10

申请号：US16301772

申请日：2017-05-26

Applicant: MEDIATEK INC.

Inventor： Tzu-Der Chuang ,  Ching-Yeh Chen ,  Yu-Chen Sun ,  Yu-Wen Huang ,  Shan Liu ,  Xiaozhong Xu

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/176 ,  H04N19/119 ,  H04N19/186 ,  H04N19/513 ,  H04N19/70 ,  H04N19/00 ,  H04N19/159 ,  H04N19/96 ,  H04N19/436

Abstract: A method and apparatus for a video coding system with the current picture referencing (CPR) mode enabled are disclosed. According to one method, the luma and chroma blocks of the current image are jointly coded using a same coding unit (CU) structure if the CPR mode is selected for the luma and the chroma blocks. Alternatively, if the luma and chroma components are partitioned into the luma and the chroma blocks separately using separate CU structures, the luma and chroma blocks are encoded or decoded using a coding mode selected from a coding mode group excluding the CPR mode. According to another method, the luma and chroma blocks of the current image are coded separately using a different CU structure if the CPR mode is selected for the luma and chroma blocks. In yet another method, reconstructed reference data is disclosed for the CPR mode with CU equal to PU.

公开(公告)号：US11082713B2

公开(公告)日：2021-08-03

申请号：US15776170

申请日：2016-11-18

Applicant: MEDIATEK INC.

Inventor： Shan Liu ,  Xiaozhong Xu

IPC: H04N19/527 ,  H04N19/70

Abstract: A method and apparatus of Inter prediction for video coding performed in a video encoder or a video decoder are disclosed. In one method, a GMC (global motion compensation) indication indicating whether global motion compensation is enabled is signalled at the video encoder side or parsed from the video bitstream at the video decoder side. The current processing unit is encoded or decoded using one or more coding modes including a GMC mode if the GMC indication is indicates GMC is enabled. According to another method, if a GMC mode is enabled for a region, a number representing the total number of multiple global motion models allowed is determined for encoding or decoding the processing units in the region using multiple global motion models. In yet another method the GMC and local motion compensation are applied selectively or in a combined fashion.

公开(公告)号：US10856009B2

公开(公告)日：2020-12-01

申请号：US15514926

申请日：2015-10-08

Applicant: MEDIATEK INC.

Inventor： Tzu-Der Chuang ,  Xiaozhong Xu ,  Yu-Chen Sun ,  Shih-Ta Hsiang ,  Shan Liu

IPC: H04N19/593 ,  H04N19/513 ,  H04N19/52

Abstract: A method of video coding using coding modes including IntraBC mode (Intra-block copy mode) for a picture is disclosed. The system determines whether the current reference block is located above a current coding unit (CU) containing the current prediction unit (PU) in a vertical direction and whether the current reference block is located on a left side of the current CU in a horizontal direction based on the original block vector (BV). If both results are not true, the original BV is clipped to a clipped BV so that a relocated reference block corresponding to the clipped BV is above the current CU in the vertical direction or to the left side of the current CU in the horizontal direction. The clipped BV is used as a predictor for encoding or decoding of a current BV or used for IntraBC encoding or decoding of the current PU.