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：US11032550B2

公开(公告)日：2021-06-08

申请号：US15440085

申请日：2017-02-23

Applicant: MEDIATEK INC.

Inventor： Jing Ye ,  Shan Liu ,  Shaw-Min Lei

IPC: H04N19/159 ,  H04N19/105 ,  H04N19/176 ,  H04N19/513

Abstract: In one example, a method for video coding includes receiving input data associated with a current block in an image frame, generating an inter predictor of the current block, and generating an intra predictor of the current block based on samples of neighboring pixels and an intra prediction mode that locates the samples of neighboring pixels. The method further includes generating a final predictor of the current block by combining the inter predictor and the intra predictor according to one or more intra weight coefficients associated with the intra prediction mode, and encoding or decoding the current block based on the final predictor to output encoded video data or a decoded block. The one or more intra weight coefficients indicate one or more ratios that corresponding one or more portions of the intra predictor are combined with the inter predictor, respectively.

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.

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.