公开(公告)号：US20190387222A1

公开(公告)日：2019-12-19

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：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：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：US20160100184A1

公开(公告)日：2016-04-07

申请号：US14821100

申请日：2015-08-07

Applicant: MediaTek Inc.

Inventor： Shan LIU ,  Jungsun KIM ,  Tzu-Der CHUANG

IPC: H04N19/50 ,  H04N19/46 ,  H04N19/70 ,  H04N19/105 ,  H04N19/186 ,  H04N19/96 ,  H04N1/64

CPC classification number: H04N19/50 ,  H04N1/644 ,  H04N19/105 ,  H04N19/11 ,  H04N19/176 ,  H04N19/182 ,  H04N19/186 ,  H04N19/46 ,  H04N19/463 ,  H04N19/593 ,  H04N19/70 ,  H04N19/93 ,  H04N19/94 ,  H04N19/96

Abstract: Methods for coding a block of video data using palette coding in a video coding are disclosed. According to one embodiment, the palette transpose flag is signaled conditionally depending on the maximum index value or the palette size. If the maximum index value or the palette size is equal to or greater than a threshold size, the palette transpose flag is signaled at an encoder side or parsed at a decoder side. Otherwise, the palette transpose flag is not signaled or parsed. In another embodiment, the last palette and the last palette size are updated by the current palette with the current palette size conditionally. For example, updating the last palette and the last palette size by the current palette with the current palette size is skipped if the current coding unit is coded using a pulse-coded modulation (PCM) mode or the current palette size is zero.

Abstract translation: 公开了使用视频编码中的调色板编码对视频数据块进行编码的方法。 根据一个实施例，根据最大索引值或调色板大小有条件地发信号通知调色板转置标志。 如果最大索引值或调色板大小等于或大于阈值大小，则调色板转置标志在编码器侧发信号通知或在解码器侧进行解析。 否则，调色板转置标志不发信号或解析。 在另一个实施例中，最后一个调色板和最后一个调色板大小由具有条件的当前调色板大小的当前调色板更新。 例如，如果使用脉冲编码调制（PCM）模式或当前调色板大小为零对当前编码单元进行编码，则跳过具有当前调色板大小的当前调色板更新最后调色板和最后调色板尺寸。

公开(公告)号：US20160057434A1

公开(公告)日：2016-02-25

申请号：US14805605

申请日：2015-07-22

Applicant: MediaTek Inc.

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

IPC: H04N19/176 ,  H04N19/44

CPC classification number: H04N19/176 ,  H04N1/644 ,  H04N19/105 ,  H04N19/11 ,  H04N19/182 ,  H04N19/186 ,  H04N19/44 ,  H04N19/463 ,  H04N19/593 ,  H04N19/70 ,  H04N19/93 ,  H04N19/94

Abstract: / Method and apparatus for coding a block of video data using palette coding in a video coding are disclosed. According to one embodiment, whether there is only one single palette index in the current block is determined first. If there is only one single palette index in the current block, signaling a current palette index map for the current block is omitted at an encoder side or parsing any syntax for decoding the current palette index map for the current block is omitted at a decoder side. The decision regarding whether there is only one single palette index in the current block is based on one or more syntax elements not corresponding to palette index coding.

Abstract translation: 公开了使用视频编码中的调色板编码对视频数据块进行编码的方法和装置。 根据一个实施例，首先确定当前块中是否只有一个单调色板索引。 如果当前块中只有一个调色板索引，则在编码器侧省略当前块的当前调色板索引映射，或者在解码器侧省略当前块的当前调色板索引映射的任何语法解码 。 关于当前块中是否只有一个调色板索引的决定基于一个或多个不对应于调色板索引编码的语法元素。

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.

公开(公告)号：US20170374369A1

公开(公告)日：2017-12-28

申请号：US15629877

申请日：2017-06-22

Applicant: MEDIATEK INC.

Inventor： Tzu-Der CHUANG ,  Ching-Yeh CHEN ,  Yu-Wen HUANG ,  Jing YE ,  Shan LIU ,  Xiaozhong XU ,  Jungsun KIM

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

CPC classification number: H04N19/159 ,  H04N19/105 ,  H04N19/11 ,  H04N19/176 ,  H04N19/44 ,  H04N19/593 ,  H04N19/70

Abstract: Video processing methods and apparatuses receive input data associated with a current block, determine an actual intra prediction mode for the current block by performing decoder side intra mode derivation, perform intra prediction based on the actual intra prediction mode, replace the actual intra prediction mode with a pseudo mode when processing the current block by an intra mode dependent tool in syntax signaling or parsing, and encode or decode the current block. The pseudo mode referenced by the intra mode dependent tool is a predefined mode or a derived mode, which is referenced as the intra prediction mode for blocks coded using decoder side intra mode derivation, or is referenced by the intra mode dependent tool as the intra prediction mode for all intra prediction coded blocks.

公开(公告)号：US20160309183A1

公开(公告)日：2016-10-20

申请号：US15101139

申请日：2014-12-26

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 ,  H04N19/186 ,  H04N19/124 ,  H04N19/176 ,  H04N19/182

CPC classification number: H04N19/593 ,  H04N19/124 ,  H04N19/176 ,  H04N19/182 ,  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.

Abstract translation: 公开了使用基于重构的相邻像素的索引预测对视频数据块进行颜色索引编码的方法和装置。 在一个实施例中，通过从重建的相邻像素的相邻像素索引导出索引预测，将颜色索引编码或解码应用于当前像素索引。 首先根据量化表将重建的相邻像素值变换为相邻像素索引，以在主要颜色索引和当前块的主要颜色值之间进行映射。 量化表可以基于当前块的主色表或也可以在解码器侧得到。 解码处理可以通过根据量化表将解码的当前像素索引转换为重构的当前像素值或通过直接复制由解码的当前像素索引指示的重建的相邻像素值来重构当前像素。