公开(公告)号：US20190110071A1

公开(公告)日：2019-04-11

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

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：US20180091829A1

公开(公告)日：2018-03-29

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

CPC classification number: H04N19/93 ,  H04N19/182 ,  H04N19/593 ,  H04N19/70 ,  H04N19/91

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：US20170223379A1

公开(公告)日：2017-08-03

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 ,  H04N19/167 ,  H04N19/176

CPC classification number: 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：US20210281846A1

公开(公告)日：2021-09-09

申请号：US16332435

申请日：2016-09-13

Applicant: MEDIATEK INC.

Inventor： Shih-Ta HSIANG ,  Shaw-Min LEI ,  Yu-Wen HUANG ,  Yu-Chen SUN

IPC: H04N19/126 ,  H04N19/176 ,  H04N19/167 ,  H04N19/70

Abstract: A method and apparatus for processing transform blocks of video data performed by a video encoder or a video decoder are disclosed. A plurality of quantization matrix sets are determined, where each quantization matrix set includes one or more quantization matrices corresponding to different block types. For a transform block corresponding to a current block in a current picture, a selected quantization matrix set is determined from the plurality of quantization matrix sets for the transform block. Quantization process or de-quantization process is applied to the transform block using a corresponding quantization matrix from the selected quantization matrix set.

公开(公告)号：US20180249172A1

公开(公告)日：2018-08-30

申请号：US15754683

申请日：2016-08-31

Applicant: MEDIATEK INC.

Inventor： Ching-Yeh CHEN ,  Tzu-Der CHUANG ,  Yi-Wen CHEN ,  Yu-Chen SUN ,  Yu-Wen HUANG

IPC: H04N19/513 ,  H04N19/182 ,  H04N19/176

CPC classification number: H04N19/513 ,  G06T7/269 ,  H04N19/176 ,  H04N19/182 ,  H04N19/521 ,  H04N19/53 ,  H04N19/54 ,  H04N19/577

Abstract: A method and apparatus of motion compensation using the bi-directional optical flow (BIO) techniques are disclosed. According to one method, the use of BIO is extended to general bi-prediction motion compensation by including the case that two reference pictures correspond to two previously coded pictures. According to another method, the use of BIO is adaptively applied depending on the linearity of the two motion vectors associated with the two reference blocks or depending on block size of the current block. According to yet another method, the refined motion vectors by compensating the original motion vectors with the respective x-offset values and y-offset values are stored in a motion-vector buffer for motion vector prediction of one or more following blocks.