公开(公告)号：US09560359B2

公开(公告)日：2017-01-31

申请号：US14368283

申请日：2012-12-28

Applicant: MEDIATEK Singapore Pte. Ltd.

Inventor： Shaw-Min Lei ,  Xun Guo

IPC: H04N7/12 ,  H04N19/105 ,  H04N19/593 ,  H04N19/186 ,  H04N19/59 ,  H04N19/136 ,  H04N19/167 ,  H04N19/176 ,  H04N19/11 ,  H04N19/157 ,  H04N19/16

CPC classification number: H04N19/105 ,  H04N19/11 ,  H04N19/136 ,  H04N19/157 ,  H04N19/16 ,  H04N19/167 ,  H04N19/176 ,  H04N19/186 ,  H04N19/59 ,  H04N19/593

Abstract: A method and apparatus for luma-based chroma intra prediction for a current chroma block are disclosed. The chroma intra predictor is derived from reconstructed luma pixels of a current luma block according to the chroma sampling format. Depending on the chroma sampling format, either sub-sampling, down-sampling or no processing is applied to the reconstructed luma pixels in horizontal or vertical direction. The information associated with the chroma sampling format can be incorporated in the sequence parameter set (SPS), the picture parameter set (PPS), the adaptation parameter set (APS) or the slice header of a video bitstream.

Abstract translation: 公开了一种用于当前色度块的基于亮度的色度帧内预测的方法和装置。 色度内预测器根据色度采样格式从当前亮度块的重构亮度像素导出。 根据色度采样格式，将水平或垂直方向上的重建亮度像素应用于子采样，下采样或不处理。 与色度采样格式相关联的信息可以并入视频比特流的序列参数集（SPS），图像参数集（PPS），适配参数集（APS）或片头。

公开(公告)号：US20150110180A1

公开(公告)日：2015-04-23

申请号：US14403189

申请日：2013-05-07

Applicant: MEDIATEK Singapore Pte. Ltd.

Inventor： Jicheng An ,  Liang Zhao ,  Xun Guo ,  Shaw-Min Lei

IPC: H04N19/61 ,  H04N19/44 ,  H04N19/91

CPC classification number: H04N19/61 ,  H04N19/12 ,  H04N19/127 ,  H04N19/159 ,  H04N19/176 ,  H04N19/44 ,  H04N19/70 ,  H04N19/91

Abstract: A method and apparatus for video coding including an Intra transform Skip mode is disclosed. When the transform Skip mode is ON for a transform unit, embodiments according to the present invention apply different coding processes to the transform unit. The coding process with the transform Skip mode ON uses a different scan pattern from the coding process with the transform Skip mode OFF. According to various embodiments, the transform Skip mode is enabled when the transform unit size is 4×4, the prediction unit and the transform unit having the same size, or the prediction unit uses an INTRA_N×N mode. When the transform Skip mode is enabled, a flag can be signaled in the bitstream to indicate the transform Skip mode selection. Furthermore, the flag can be incorporated in a picture level, a slice level or a sequence level of the video bitstream.

Abstract translation: 公开了一种包括Intra变换跳过模式的视频编码方法和装置。 当变换单元的变换跳过模式为ON时，根据本发明的实施例将不同的编码处理应用于变换单元。 使用变换跳过模式ON的编码过程使用转换跳过模式OFF的编码过程中的不同扫描模式。 根据各种实施例，当变换单元大小为4×4，预测单元和具有相同大小的变换单元，或者预测单元使用INTRA_N×N模式时，转换跳过模式被使能。 当转换跳转模式使能时，可以在比特流中用信号通知标志，以指示变换跳过模式选择。 此外，该标志可以并入视频比特流的图像级，片级或序列级。

公开(公告)号：US20140362924A1

公开(公告)日：2014-12-11

申请号：US14372752

申请日：2013-01-16

Applicant: MEDIATEK Singapore Pte, Ltd.

Inventor： Liang Zhao ,  Xun Guo ,  Shaw-Min Lei

IPC: H04N19/51 ,  H04N19/583

CPC classification number: H04N19/139 ,  H04N19/105 ,  H04N19/107 ,  H04N19/176 ,  H04N19/503 ,  H04N19/51 ,  H04N19/513 ,  H04N19/52 ,  H04N19/56 ,  H04N19/593 ,  H04N19/70

Abstract: A method and apparatus for deriving a motion vector predictor (MVP) candidate set for motion vector coding of a current block. Embodiments according to the present invention determine a redundancy-removed spatial MVP candidate set by removing any redundant MVP candidate from the spatial MVP candidate set. The redundancy-removal process does not apply to the temporal MVP candidate. In another embodiment of the present invention, a redundancy-removed spatial-temporal MVP candidate set is determined and the number of candidates in the redundancy-removed spatial-temporal MVP candidate set is checked to determine whether it is smaller than a threshold. If the number of candidates is smaller than the threshold, a zero motion vector is added to the redundancy-removed spatial-temporal MVP candidate set. The redundancy-removed spatial-temporal MVP candidate set is then provided for encoding or decoding of the motion vector of the current block.

Abstract translation: 一种用于导出用于当前块的运动矢量编码的运动矢量预测器（MVP）候选组的方法和装置。 根据本发明的实施例通过从空间MVP候选集中去除任何冗余MVP候选来确定冗余删除的空间MVP候选集。 冗余删除过程不适用于时间MVP候选。 在本发明的另一个实施例中，确定冗余删除的空间 - 时间MVP候选集合，并且检查冗余删除的空间 - 时间MVP候选集合中的候选数目以确定它是否小于阈值。 如果候选数量小于阈值，则将零运动矢量加到冗余去除的空间 - 时间MVP候选组中。 然后提供冗余去除空间 - 时间MVP候选集合用于对当前块的运动矢量进行编码或解码。

公开(公告)号：US09420296B2

公开(公告)日：2016-08-16

申请号：US13985779

申请日：2012-12-14

Applicant: MediaTek Singapore Pte. Ltd.

Inventor： Xun Guo ,  Shaw-Min Lei

IPC: H04N11/02 ,  H04N19/126 ,  H03M7/30 ,  H04N19/132 ,  H04N19/146 ,  H04N19/18 ,  H04N19/44

CPC classification number: H04N19/124 ,  H03M7/3059 ,  H04N19/126 ,  H04N19/132 ,  H04N19/136 ,  H04N19/146 ,  H04N19/18 ,  H04N19/184 ,  H04N19/44 ,  H04N19/60

Abstract: A method and apparatus for clipping a transform coefficient are disclosed. Embodiments according to the present invention avoid overflow of the quantized transform coefficient by clipping the quantization level adaptively after quantization. In one embodiment, the method comprises generating the quantization level for the transform coefficient of a transform unit by quantizing the transform coefficient according to a quantization matrix and quantization parameter. The clipping condition is determined and the quantization level is clipped according to the clipping condition to generate a clipping-processed quantization level. The clipping condition includes a null clipping condition. The quantization level is clipped to fixed-range represented in n bits for the null clipping condition, where n correspond to 8, 16, or 32. The quantization level may also be clipped within a range from −m to m−1 for the null clipping condition, where m may correspond to 128, 32768, or 2147483648.

Abstract translation: 公开了一种用于剪切变换系数的方法和装置。 根据本发明的实施例通过量化后自适应地削减量化电平来避免量化变换系数的溢出。 在一个实施例中，该方法包括通过根据量化矩阵和量化参数量化变换系数来产生变换单元的变换系数的量化级。 确定剪切条件，并根据剪切条件限制量化级别，以产生削波处理的量化级别。 剪切条件包括零剪切条件。 量化电平被削减到用于零削波条件的n位表示的固定范围，其中n对应于8,16或32。量化电平也可以在-m至m-1的范围内被修剪为零 剪切条件，其中m可以对应于128，32768或2147483648。

公开(公告)号：US20150030067A1

公开(公告)日：2015-01-29

申请号：US14372696

申请日：2013-01-07

Applicant: MEDIATEK Singapore Pte. Ltd.

Inventor： Liang Zhao ,  Jicheng An ,  Xin Zhao ,  Xun Guo

IPC: H04N19/186 ,  H04N19/60

CPC classification number: H04N19/60 ,  H04N19/132 ,  H04N19/176 ,  H04N19/186 ,  H04N19/46 ,  H04N19/96

Abstract: A method and an apparatus for decoding of a video bitstream are disclosed. In one embodiment, the method comprises: decoding a first coded block flag (cbf) of the color component indicating whether a current coding unit (CU) of the color component has at least one non-zero transform coefficient (830). According to the first cbf of the color component, the method further comprises decoding four second cbfs, each indicating whether one of four sub-blocks in the current CU of the color component has at least one non-zero transform coefficient (850). The residual quad-tree (RQT) of the current CU of the color component is determined based on the first cbf of the color component (870), or based on the first cbf and the second cbfs of the color component if the second cbfs exist (860). In another embodiment, the method comprises decoding a cbf associated with a transform unit (TU) and determining RQT of the TU based on the cbf, wherein said determining the RQT of the TU based on the cbf is the same for a luma component and a chroma component and the cbf is recovered from the video bitstream.

Abstract translation: 公开了一种用于解码视频比特流的方法和装置。 在一个实施例中，该方法包括：对颜色分量的第一编码块标志（cbf）进行解码，指示颜色分量的当前编码单元（CU）是否具有至少一个非零变换系数（830）。 根据颜色分量的第一cbf，该方法还包括解码四个第二cbfs，每个cbfs指示颜色分量的当前CU中的四个子块中的一个是否具有至少一个非零变换系数（850）。 基于颜色分量（870）的第一cbf，或者如果第二个cbfs存在，则基于颜色分量的第一cbf和第二cbfs来确定颜色分量的当前CU的残余四叉树（RQT） （860）。 在另一个实施例中，该方法包括解码与变换单元（TU）相关联的cbf并基于cbf确定TU的RQT，其中基于cbf确定TU的RQT对于亮度分量是相同的，并且 色度分量和cbf从视频比特流中恢复。

公开(公告)号：US20140355667A1

公开(公告)日：2014-12-04

申请号：US14368283

申请日：2012-12-28

Applicant: MEDIATEK Singapore Pte. Ltd.

Inventor： Shaw-Min Lei ,  Xun Guo

IPC: H04N19/105 ,  H04N19/136 ,  H04N19/167 ,  H04N19/186

CPC classification number: H04N19/105 ,  H04N19/11 ,  H04N19/136 ,  H04N19/157 ,  H04N19/16 ,  H04N19/167 ,  H04N19/176 ,  H04N19/186 ,  H04N19/59 ,  H04N19/593

Abstract: A method and apparatus for luma-based chroma intra prediction for a current chroma block are disclosed. The chroma intra predictor is derived from reconstructed luma pixels of a current luma block according to the chroma sampling format. Depending on the chroma sampling format, either sub-sampling, down-sampling or no processing is applied to the reconstructed luma pixels in horizontal or vertical direction. The information associated with the chroma sampling format can be incorporated in the sequence parameter set (SPS), the picture parameter set (PPS), the adaptation parameter set (APS) or the slice header of a video bitstream.

Abstract translation: 公开了一种用于当前色度块的基于亮度的色度帧内预测的方法和装置。 色度内预测器根据色度采样格式从当前亮度块的重构亮度像素导出。 根据色度采样格式，将水平或垂直方向上的重建亮度像素应用于子采样，下采样或不处理。 与色度采样格式相关联的信息可以并入视频比特流的序列参数集（SPS），图像参数集（PPS），适配参数集（APS）或片头。

公开(公告)号：US09794557B2

公开(公告)日：2017-10-17

申请号：US14380709

申请日：2013-01-24

Applicant: MEDIATEK Singapore Pte. Ltd.

Inventor： Juliana Hsu ,  Mei Guo ,  Xun Guo

IPC: H04N19/593 ,  H04N19/186 ,  H04N19/42

CPC classification number: H04N19/169 ,  H04N19/186 ,  H04N19/42 ,  H04N19/593

Abstract: A method and apparatus for chroma intra prediction is based on reconstructed luma pixels and chroma pixels, where the chroma intra prediction is based on a linear model of derived co-located current luma pixels of the current luma block scaled by a scaling factor. The scaling factor comprises a product term of a division factor and a scaled covariance-like value associated with neighboring reconstructed luma and chroma pixels of a current block. The division factor is related to a first data range divided with rounding by a scaled variance-like value associated with the neighboring reconstructed luma pixels of the current block. The scaled covariance-like value, the first data range, or both of the scaled covariance-like value and the first data range are dependent on the internal bit depth, with which the chroma signal is processed during video coding process, according to an embodiment of the present invention.

公开(公告)号：US20150036745A1

公开(公告)日：2015-02-05

申请号：US14380709

申请日：2013-01-24

Applicant: MEDIATEK Singapore Pte. Ltd.

Inventor： Juliana Hsu ,  Mei Guo ,  Xun Guo

IPC: H04N19/593

CPC classification number: H04N19/169 ,  H04N19/186 ,  H04N19/42 ,  H04N19/593

Abstract: A method and apparatus for chroma intra prediction based on reconstructed luma pixels and chroma pixels are disclosed. The chroma intra prediction is based on a linear model of derived co-located current luma pixels of the current luma block scaled by a scaling factor. The scaling factor comprises a product term of a division factor and a scaled covariance-like value associated with neighboring reconstructed luma and chroma pixels of a current block. The division factor is related to a first data range divided with rounding by a scaled variance-like value associated with the neighboring reconstructed luma pixels of the current block. The scaled covariance-like value, the first data range, or both of the scaled covariance-like value and the first data range are dependent on the internal bit depth, with which the chroma signal is processed during video coding process, according to an embodiment of the present invention.

Abstract translation: 公开了一种基于重建亮度像素和色度像素的色度帧内预测的方法和装置。 色度帧内预测基于通过缩放因子缩放的当前亮度块的导出的同位置的当前亮度像素的线性模型。 缩放因子包括与当前块的相邻重建亮度和色度像素相关联的分割因子和缩放协方差值的乘积项。 分割因子与通过与当前块的相邻重建亮度像素相关联的经缩放的类似方差的舍入与第一数据范围相关。 缩放的协方差值，第一数据范围或缩放的协方差样值和第一数据范围两者都取决于根据实施例在视频编码处理期间处理色度信号的内部比特深度 的本发明。