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    Method and apparatus for palette coding with cross block prediction
    1.
    发明授权
    Method and apparatus for palette coding with cross block prediction 有权

    公开(公告)号：US10182242B2

    公开(公告)日：2019-01-15

    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

    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.

    Method and apparatus for intra chroma coding in image and video coding
    2.
    发明授权
    Method and apparatus for intra chroma coding in image and video coding 有权

    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.

    Method and apparatus for palette coding with cross block prediction
    3.
    发明授权
    Method and apparatus for palette coding with cross block prediction 有权

    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.

    Method for color index coding using a generalized copy previous mode
    5.
    发明授权
    Method for color index coding using a generalized copy previous mode 有权

    公开(公告)号：US10448049B2

    公开(公告)日：2019-10-15

    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: H04N19/00 ,  H04N19/593 ,  H04N19/70 ,  H04N19/184 ,  G06F17/27

    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.

    Methods and apparatus of decoding process for palette syntax
    6.
    发明授权
    Methods and apparatus of decoding process for palette syntax 有权

    公开(公告)号：US09900624B2

    公开(公告)日：2018-02-20

    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: H04N19/44 ,  H04N19/86 ,  H04N19/186 ,  H04N19/176 ,  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.

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