公开(公告)号：US10924732B2

公开(公告)日：2021-02-16

申请号：US16817910

申请日：2020-03-13

Applicant: Texas Instruments Incorporated

Inventor： Madhukar Budagavi ,  Akira Osamoto

IPC: H04N19/105 ,  H04N19/59 ,  H04N19/167 ,  H04N19/186 ,  H04N19/96

Abstract: A method for luma-based chroma intra-prediction in a video encoder or a video decoder is provided that includes down sampling a first reconstructed luma block of a largest coding unit (LCU), computing parameters α and β of a linear model using immediate top neighboring reconstructed luma samples and left neighboring reconstructed luma samples of the first reconstructed luma block and reconstructed neighboring chroma samples of a chroma block corresponding to the first reconstructed luma block, wherein the linear model is PredC[x,y]=α·RecL′[x,y]+β, wherein x and y are sample coordinates, PredC is predicted chroma samples, and RecL′ is samples of the down sampled first reconstructed luma block, and wherein the immediate top neighboring reconstructed luma samples are the only top neighboring reconstructed luma samples used, and computing samples of a first predicted chroma block from corresponding samples of the down sampled first reconstructed luma block using the linear model and the parameters.

公开(公告)号：US09264710B2

公开(公告)日：2016-02-16

申请号：US13936249

申请日：2013-07-08

Applicant: Texas Instruments Incorporated

Inventor： Ranga Ramanujam Srinivasan ,  Hyung Joon Kim ,  Akira Osamoto

IPC: H04N7/12 ,  H04N13/00 ,  G06F7/00 ,  H04N19/593 ,  H04N19/119 ,  H04N19/147 ,  H04N19/11 ,  H04N19/157 ,  H04N19/174 ,  H04N19/33

CPC classification number: H04N19/11 ,  H04N19/119 ,  H04N19/136 ,  H04N19/147 ,  H04N19/157 ,  H04N19/174 ,  H04N19/176 ,  H04N19/33 ,  H04N19/593 ,  H04N19/61

Abstract: Several systems and methods for intra-prediction estimation of video pictures are disclosed. In an embodiment, the method includes accessing four ‘N×N’ pixel blocks comprising luma-related pixels. The four ‘N×N’ pixel blocks collectively configure a ‘2N×2N’ pixel block. A first pre-determined number of candidate luma intra-prediction modes is accessed for each of the four ‘N×N’ pixel blocks. A presence of one or more luma intra-prediction modes that are common among the candidate luma intra-prediction modes of at least two of the four ‘N×N’ pixel blocks is identified. The method further includes performing, based on the identification, one of (1) selecting a principal luma intra-prediction mode for the ‘2N×2N’ pixel block and (2) limiting a partitioning size to a ‘N×N’ pixel block size for a portion of the video picture corresponding to the ‘2N×2N’ pixel block.

Abstract translation: 公开了用于视频图像的帧内预测估计的几种系统和方法。 在一个实施例中，该方法包括访问包括亮度相关像素的四个“N×N”像素块。 四个“N×N”像素块共同地配置“2N×2N”像素块。 对于四个“N×N”像素块中的每一个访问第一预定数量的候选亮度帧内预测模式。 识别在四个“N×N”像素块中的至少两个的候选亮度帧内预测模式中共有的一个或多个亮度帧内预测模式的存在。 该方法还包括以下步骤：（1）为“2N×2N”像素块选择主要亮度帧内预测模式，（2）将分割大小限制为“N×N”像素块 对应于“2N×2N”像素块的视频图像的一部分的大小。

公开(公告)号：US20140010293A1

公开(公告)日：2014-01-09

申请号：US13936249

申请日：2013-07-08

Applicant: Texas Instruments Incorporated

Inventor： Ranga Ramanujam Srinivasan ,  Hyung Joon Kim ,  Akira Osamoto

IPC: H04N7/34

CPC classification number: H04N19/11 ,  H04N19/119 ,  H04N19/136 ,  H04N19/147 ,  H04N19/157 ,  H04N19/174 ,  H04N19/176 ,  H04N19/33 ,  H04N19/593 ,  H04N19/61

Abstract: Several systems and methods for intra-prediction estimation of video pictures are disclosed. In an embodiment, the method includes accessing four ‘N×N’ pixel blocks comprising luma-related pixels. The four ‘N×N’ pixel blocks collectively configure a ‘2N×2N’ pixel block. A first pre-determined number of candidate luma intra-prediction modes is accessed for each of the four ‘N×N’ pixel blocks. A presence of one or more luma intra-prediction modes that are common among the candidate luma intra-prediction modes of at least two of the four ‘N×N’ pixel blocks is identified. The method further includes performing, based on the identification, one of (1) selecting a principal luma intra-prediction mode for the ‘2N×2N’ pixel block and (2) limiting a partitioning size to a ‘N×N’ pixel block size for a portion of the video picture corresponding to the ‘2N×2N’ pixel block.

Abstract translation: 公开了用于视频图像的帧内预测估计的几种系统和方法。 在一个实施例中，该方法包括访问包括亮度相关像素的四个“N×N”像素块。 四个“N×N”像素块共同地配置“2N×2N”像素块。 对于四个“N×N”像素块中的每一个访问第一预定数量的候选亮度帧内预测模式。 识别在四个“N×N”像素块中的至少两个的候选亮度帧内预测模式中共有的一个或多个亮度帧内预测模式的存在。 该方法还包括以下步骤：（1）为“2N×2N”像素块选择主亮度帧内预测模式，（2）将分割大小限制为“N×N”像素块 对应于“2N×2N”像素块的视频图像的一部分的大小。