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    Flexible range reduction
    21.
    发明申请
    Flexible range reduction 有权
    弹性范围缩小

    公开(公告)号：US20050063471A1

    公开(公告)日：2005-03-24

    申请号：US10989702

    申请日：2004-11-15

    Applicant: Shankar Regunathan ,  Sridhar Srinivasan ,  Jie Liang ,  Chih-Lung Lin ,  Minghui Xia

    Inventor： Shankar Regunathan ,  Sridhar Srinivasan ,  Jie Liang ,  Chih-Lung Lin ,  Minghui Xia

    IPC: H04N7/32 ,  H03M7/36 ,  H04N20060101 ,  H04N7/01 ,  H04N7/12 ,  H04N7/26 ,  H04N7/36 ,  H04N7/50

    CPC classification number: H04N19/00145 ,  H04N19/137 ,  H04N19/16 ,  H04N19/196 ,  H04N19/46 ,  H04N19/51 ,  H04N19/61 ,  H04N19/70

    Abstract: Techniques and tools are described for flexible range reduction of samples of video. For example, an encoder signals a first set of one or more syntax elements for range reduction of luma samples and signals a second set of one or more syntax elements for range reduction of chroma samples. The encoder selectively scales down the luma samples and chroma samples in a manner consistent with the first syntax element(s) and second syntax element(s), respectively. Or, an encoder signals range reduction syntax element(s) in an entry point header for an entry point segment, where the syntax element(s) apply to pictures in the entry point segment. If range reduction is used for the pictures, the encoder scales down samples of the pictures. Otherwise, the encoder skips the scaling down. A decoder performs corresponding parsing and scaling up operations.

    Abstract translation: 描述了技术和工具，用于灵活地缩减视频样本。 例如，编码器用信号通知一个或多个语法元素的第一组，用于亮度样本的范围减小，并且为第二组一个或多个语法元素用于色度样本的范围缩小。 编码器分别以与第一语法元素和第二语法元素一致的方式选择性地缩小亮度样本和色度样本。 或者，编码器对入口点段的入口点标题中的范围缩小语法元素进行信号，其中语法元素适用于入口点段中的图像。 如果图像使用范围缩小，则编码器缩小图像的样本。 否则，编码器跳过缩小比例。 解码器执行相应的解析和放大操作。

    DC coefficient signaling at small quantization step sizes
    26.
    发明授权
    DC coefficient signaling at small quantization step sizes 有权
    小量化步长的直流系数信号

    公开(公告)号：US07738554B2

    公开(公告)日：2010-06-15

    申请号：US10893168

    申请日：2004-07-17

    Applicant: Chih-Lung Lin ,  Shankar Regunathan ,  Sridhar Srinivasan

    Inventor： Chih-Lung Lin ,  Shankar Regunathan ,  Sridhar Srinivasan

    IPC: H04N7/12 ,  H04N11/02 ,  H04N11/04

    CPC classification number: H04N19/18 ,  H04N19/124 ,  H04N19/126 ,  H04N19/136 ,  H04N19/137 ,  H04N19/17 ,  H04N19/176 ,  H04N19/184 ,  H04N19/186 ,  H04N19/44 ,  H04N19/46 ,  H04N19/61 ,  H04N19/625 ,  H04N19/70 ,  H04N19/91

    Abstract: Described tools and techniques relate to signaling for DC coefficients at small quantization step sizes. The techniques and tools can be used in combination or independently. For example, a tool such as a video encoder or decoder processes a VLC that indicates a DC differential for a DC coefficient, a FLC that indicates a value refinement for the DC differential, and a third code that indicates the sign for the DC differential. Even with the small quantization step sizes, the tool uses a VLC table with DC differentials for DC coefficients above the small quantization step sizes. The FLCs for DC differentials have lengths that vary depending on quantization step size.

    Abstract translation: 描述的工具和技术涉及在小量化步长下用于DC系数的信令。 技术和工具可以组合使用或独立使用。 例如，诸如视频编码器或解码器的工具处理指示DC系数的DC差分的VLC，指示DC差分的值细化的FLC以及指示DC差分的符号的第三代码。 即使使用较小的量化步长，该工具也会使用具有DC系数的直流差分的VLC表，其高于小量化步长。 用于DC差分的FLC具有随量化步长变化的长度。

    Signaling for entry point frames with predicted first field
    28.
    发明授权
    Signaling for entry point frames with predicted first field 有权
    对具有预测的第一场的入口点信号进行信令

    公开(公告)号：US07609762B2

    公开(公告)日：2009-10-27

    申请号：US10989843

    申请日：2004-11-15

    Applicant: Regis J. Crinon ,  Thomas W. Holcomb ,  Shankar Regunathan ,  Sridhar Srinivasan

    Inventor： Regis J. Crinon ,  Thomas W. Holcomb ,  Shankar Regunathan ,  Sridhar Srinivasan

    IPC: H04N7/32 ,  H04N1/415

    CPC classification number: H04N21/23424 ,  H04N19/44 ,  H04N19/70 ,  H04N21/44016 ,  H04N21/8455

    Abstract: A video decoder receives an entry point key frame comprising first and second interlaced video fields and decodes a first syntax element comprising information (e.g., frame coding mode) for the entry point key frame at a first syntax level (e.g., frame level) in a bitstream. The first interlaced video field is a predicted field, and the second interlaced video field is an intra-coded field. The information for the entry point key frame can be a frame coding mode (e.g., field interlace) for the entry point key frame. The decoder can decode a second syntax element at the first syntax level comprising second information (e.g., field type for each of the first and second interlaced video fields) for the entry point key frame.

    Abstract translation: 视频解码器接收包括第一和第二隔行视频字段的入口点关键帧，并且解码第一语法元素，该第一语法元素包括第一语法元素，其包括用于入口点关键帧的信息（例如，帧编码模式） 比特流。 第一隔行视频字段是预测字段，第二隔行视频字段是帧内编码字段。 入口点关键帧的信息可以是用于入口点关键帧的帧编码模式（例如，场交错）。 解码器可以解码第一语法级别的第二语法元素，其包括用于入口点关键帧的第二信息（例如，用于第一和第二隔行扫描视频字段中的每一个的场类型）。

    Motion-compensated prediction of inter-layer residuals
    29.
    发明申请
    Motion-compensated prediction of inter-layer residuals 有权
    层间残差运动补偿预测

    公开(公告)号：US20090238279A1

    公开(公告)日：2009-09-24

    申请号：US12077768

    申请日：2008-03-21

    Applicant: Chengjie Tu ,  Sridhar Srinivasan ,  Shankar Regunathan ,  Shijun Sun ,  Chih-Lung Lin

    Inventor： Chengjie Tu ,  Sridhar Srinivasan ,  Shankar Regunathan ,  Shijun Sun ,  Chih-Lung Lin

    IPC: H04N7/34 ,  H04N7/26

    CPC classification number: H04N19/00442 ,  H04N19/30 ,  H04N19/34 ,  H04N19/61 ,  H04N19/63

    Abstract: Techniques and tools are described for scalable video encoding and decoding. In some embodiments, an encoding tool encodes base layer video and outputs encoded base layer video in a base layer bit stream. The encoding tool encodes inter-layer residual video (representing differences between input video and reconstructed base layer video) using motion compensation relative to previously reconstructed inter-layer residual video. For the inter-layer residual video, the encoding tool outputs motion information and motion-compensated prediction residuals in an enhancement layer bit stream. A decoding tool receives the base layer bit stream and enhancement layer bit stream, reconstructs base layer video, reconstructs inter-layer residual video, and combines the reconstructed base layer video and reconstructed inter-layer residual video. Using motion compensation for the inter-layer residual video facilitates the use of separate motion vectors and separate codecs for the base layer video and inter-layer residual video.

    Abstract translation: 描述了可扩展视频编码和解码的技术和工具。 在一些实施例中，编码工具对基层视频进行编码并在基层比特流中输出经编码的基层视频。 编码工具使用相对于先前重建的层间残留视频的运动补偿来编码层间残差视频（表示输入视频和重建的基本层视频之间的差异）。 对于层间残差视频，编码工具在增强层比特流中输出运动信息和运动补偿预测残差。 解码工具接收基层比特流和增强层比特流，重构基层视频，重建层间残留视频，并组合重建的基层视频和重建层间残留视频。 对于层间残留视频使用运动补偿有助于使用单独的运动矢量和单独的编解码器用于基本层视频和层间残留视频。

    Scalable video coding and decoding with sample bit depth and chroma high-pass residual layers
    30.
    发明申请
    Scalable video coding and decoding with sample bit depth and chroma high-pass residual layers 有权
    具有采样位深度和色度高通残余层的可扩展视频编码和解码

    公开(公告)号：US20090219994A1

    公开(公告)日：2009-09-03

    申请号：US12074030

    申请日：2008-02-29

    Applicant: Chengjie Tu ,  Sridhar Srinivasan ,  Shankar Regunathan ,  Shijun Sun

    Inventor： Chengjie Tu ,  Sridhar Srinivasan ,  Shankar Regunathan ,  Shijun Sun

    IPC: H04N7/26

    CPC classification number: H04N19/00315 ,  H04N19/186 ,  H04N19/33 ,  H04N19/36 ,  H04N19/59

    Abstract: Techniques and tools are described for scalable video encoding and decoding. In some embodiments, an input frame is downsampled in terms of sample depth and chroma sampling rate, encoded, and output from the encoder as a base layer bitstream. The base layer bitstream is also reconstructed and upsampled to produce a reconstructed bitstream which is subtracted from the original input frame to produce a residual layer. The residual layer is split and encoded as a sample depth residual layer bitstream and a chroma high-pass residual layer bitstream. To recover the encoded input frame, a decoder receives one or more of these bitstreams, decodes them, and combines them to form a reconstructed image. The use of separate codecs is allowed for the base layer and the enhancement layers, without inter-layer dependencies.

    Abstract translation: 描述了可扩展视频编码和解码的技术和工具。 在一些实施例中，输入帧根据样本深度和色度采样率进行下采样，编码并从编码器输出作为基本层比特流。 基层比特流也被重建并上采样以产生从原始输入帧中减去的重构比特流，以产生残余层。 残余层被分割并编码为采样深度残留层比特流和色度高通残留层比特流。 为了恢复编码的输入帧，解码器接收这些比特流中的一个或多个，对它们进行解码，并将它们组合以形成重构的图像。 对于基本层和增强层，允许使用单独的编解码器，而不需要层间依赖。

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