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：US20170272745A1

公开(公告)日：2017-09-21

申请号：US15460558

申请日：2017-03-16

Applicant: MEDIATEK INC.

Inventor： Shan LIU ,  Xiaozhong XU ,  Jing YE

IPC: H04N19/107 ,  H04N19/46 ,  H04N19/159

Abstract: An intra prediction method comprises receiving input data of a current block in a current picture, determines a current mode set including multiple intra prediction modes for the current block, derives a number of MPMs from the number of intra prediction modes in the current mode set, and determines the MPMs for the current block. The number of MPMs varies with the number of intra prediction modes in the current mode set. The method encodes or decodes the current block according to a current intra prediction mode selected from the current mode set. To process a non-square block, a current mode set is selected from multiple mode sets according to one or both of a longer side and a shorter side of the non-square block. A current intra prediction mode is selected from the current mode set and the non-square block is coded according to the current intra prediction mode.

公开(公告)号：US20180041773A1

公开(公告)日：2018-02-08

申请号：US15658854

申请日：2017-07-25

Applicant: MEDIATEK INC.

Inventor： Jing YE ,  Shan LIU

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

CPC classification number: H04N19/593 ,  H04N19/11 ,  H04N19/176 ,  H04N19/186

Abstract: Aspects of the disclosure include a method of video coding. The method includes receiving input data associated with a first block and a second block of an image frame, the first block and the second block corresponding to different color space components. The method further includes identifying a reference region in the first block, identifying at least two reference unit cells among a plurality of unit cells in the reference region, identifying respective intra prediction modes for processing the identified reference unit cells, determining an intra prediction mode for processing a sub-block in the second block based on the identified intra prediction modes, and generating an intra predictor of the sub-block based on the determined intra prediction mode. The reference region and the sub-block correspond to a same region in the image frame. The method further includes encoding or decoding the sub-block based on the intra predictor of the sub-block.

公开(公告)号：US20180014034A1

公开(公告)日：2018-01-11

申请号：US15542739

申请日：2016-02-05

Applicant: MEDIATEK INC.

Inventor： Wang-Lin LAI ,  Jungsun KIM ,  Tzu-Der CHUANG ,  Jing YE ,  Shan LIU

IPC: H04N19/86 ,  H04N19/176 ,  H04N19/44 ,  H04N19/186 ,  H04N19/70 ,  H04N19/593

CPC classification number: H04N19/86 ,  H04N19/176 ,  H04N19/186 ,  H04N19/44 ,  H04N19/593 ,  H04N19/70

Abstract: Methods and apparatus for image or video decoding in a video decoding system are disclosed. Input data associated with a current block coded with palette mode is received to parse a palette predictor run. A position of reused colors in a palette predictor table is computed according to the palette predictor run. A size of the palette predictor table is determined and compared with the position computed according to the palette predictor run to obtain a comparison result. The decoder applies palette decoding to the current block according to the comparison result. If the comparison result indicates the position computed according to the palette predictor run is not within the palette predictor table, the position is changed to a new position to indicate a corresponding reused color for the current block or a decoding process of palette predictor reuse flags is terminated.

公开(公告)号：US20170251213A1

公开(公告)日：2017-08-31

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 ,  H04N19/513 ,  H04N19/176

CPC classification number: H04N19/159 ,  H04N19/105 ,  H04N19/176 ,  H04N19/513

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, 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：US20200288145A1

公开(公告)日：2020-09-10

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 ,  H04N19/119 ,  H04N19/129 ,  H04N19/176 ,  H04N19/186

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：US20200045322A1

公开(公告)日：2020-02-06

申请号：US16338514

申请日：2017-09-28

Applicant: MEDIATEK INC.

Inventor： Jing YE ,  Xiaozhong XU ,  Shan LIU

IPC: H04N19/176 ,  H04N19/186 ,  H04N19/593 ,  H04N19/11 ,  H04N19/105 ,  H04N19/159

Abstract: A method and apparatus for video coding of chroma coded in derived-mode Intra prediction are disclosed. If derived-mode (DM) Intra prediction is selected for a current chroma block, a corresponding luma block area is determined by locating a first upper-left pixel address of the corresponding luma block area corresponding to that of the current chroma block; one or more candidate luma coding modes are determined from a sub-block set consisting of one or more sub-blocks of the corresponding luma block area, where if the sub-block set consists of only one sub-block, the sub-block set excludes a corner sub-block located at a top-left corner of the corresponding luma block area; a current chroma Intra mode for the current chroma block is derived based on information comprising the candidate luma coding modes; and Intra-prediction encoding or decoding is applied to the current chroma block using the current chroma Intra mode derived.

公开(公告)号：US20190215521A1

公开(公告)日：2019-07-11

申请号：US16335435

申请日：2017-09-18

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Zhi-Yi LIN ,  Jing YE ,  Shan LIU

IPC: H04N19/159 ,  H04N19/176 ,  H04N19/55 ,  H04N19/105 ,  H04N19/139

CPC classification number: H04N19/159 ,  H04N19/105 ,  H04N19/11 ,  H04N19/139 ,  H04N19/176 ,  H04N19/44 ,  H04N19/503 ,  H04N19/51 ,  H04N19/55 ,  H04N19/593

Abstract: Methods and apparatus using decoder-side Intra mode derivation (DIMD) are disclosed. According to one method, two-mode DIMD is used, where two DIMD modes are developed. The DIMD predictors for the two DIMD modes are derived. A final DIMD predictor is derived by blending the two DIMD predictors. In a second method, the DIMD mode is combined with a normal Intra mode to derive a combined DIMND-Intra predictor. In a third method, the DIMD mode is combined with an Inter mode to derive a combined DIMD-Inter predictor. Various blending methods to combine the DIMD mode and another mode are also disclosed.

公开(公告)号：US20170318302A1

公开(公告)日：2017-11-02

申请号：US15520575

申请日：2015-11-06

Applicant: MEDIATEK INC.

Inventor： Jing YE ,  Shan LIU ,  Xiaozhong XU

IPC: H04N19/186 ,  H04N19/96 ,  H04N19/119

CPC classification number: H04N19/186 ,  H04N19/119 ,  H04N19/463 ,  H04N19/593 ,  H04N19/70 ,  H04N19/90 ,  H04N19/96

Abstract: A method of palette coding to apply the palette coding to sub-blocks of a coding unit and to allow each sub-block to use an individual palette table is disclosed. If the current coding block is not partitioned, the palette coding is applied to the current coding block using a first palette. If the current coding block is partitioned into multiple sub-blocks, the palette coding is applied to each sub-block using an individual second palette. Each sub-block may correspond to one prediction unit (PU). In another embodiment of the present invention, a method is disclosed that skips update of palette predictor such as last coded palette table, last coded palette size and palette predictor size associated with the current coding block if the current palette size is smaller than or equal to palette update size.

公开(公告)号：US20170289572A1

公开(公告)日：2017-10-05

申请号：US15505972

申请日：2015-09-02

Applicant: MEDIATEK INC.

Inventor： Jing YE ,  Shan LIU ,  Jungsun KIM ,  Wang-Lin LAI ,  Tzu-Der CHUANG ,  Yu-Chen SUN ,  Xiaozhong XU

IPC: H04N19/593 ,  H04N19/184 ,  G06F17/27 ,  H04N19/70

CPC classification number: H04N19/593 ,  G06F17/271 ,  H04N19/184 ,  H04N19/70

Abstract: A method for color index coding of blocks in a picture is disclosed. In one embodiment for the decoder side, a current coding mode is parsed from the input coded bitstream for one or more first currently decoded pixels in a current block starting from a first starting position. If the current coding mode corresponds to a generalized copy-previous-row mode, one or more first reference pixels starting from a first starting reference position located at T-th row above the first currently decoded pixels are identified, where T is an integer equal to or greater than one. The first reference pixels starting from the first starting reference position are then used to decode the first currently decoded pixels starting from a first starting position by copying the first reference pixels starting from the first starting reference position respectively. The system may also include a copy-left mode or escape mode.