DC COEFFICIENT SIGNALING AT SMALL QUANTIZATION STEP SIZES
    51.
    发明申请
    DC COEFFICIENT SIGNALING AT SMALL QUANTIZATION STEP SIZES 有权
    直流系数小信号步进尺寸信号

    公开(公告)号:US20100246671A1

    公开(公告)日:2010-09-30

    申请号:US12815029

    申请日:2010-06-14

    IPC分类号: H04N7/26

    摘要: 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.

    摘要翻译: 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。

    Advanced bi-directional predictive coding of video frames
    52.
    发明授权
    Advanced bi-directional predictive coding of video frames 有权
    视频帧的高级双向预测编码

    公开(公告)号:US07609763B2

    公开(公告)日:2009-10-27

    申请号:US10622378

    申请日:2003-07-18

    摘要: Techniques and tools for coding/decoding of video images, and in particular, B-frames, are described. In one aspect, a video encoder/decoder determines a fraction for a current image in a sequence. The fraction represents an estimated temporal distance position for the current image relative to an interval between a reference images for the current image. The video encoder/decoder processes the fraction along with a motion vector for a first reference image, resulting in a representation of motion (e.g., constant or variable velocity motion) in the current image. Other aspects are also described, including intra B-frames, forward and backward buffers for motion vector prediction, bitplane encoding of direct mode prediction information, multiple motion vector resolutions/interpolation filters for B-frames, proactive dropping of B-frames, and signaling of dropped predicted frames.

    摘要翻译: 描述了用于视频图像,特别是B帧的编码/解码的技术和工具。 在一个方面,视频编码器/解码器确定序列中当前图像的分数。 该分数表示当前图像相对于当前图像的参考图像之间的间隔的估计时间距离位置。 视频编码器/解码器将分数与第一参考图像的运动矢量一起处理,导致当前图像中的运动(例如恒定或可变速度运动)的表示。 还描述了其他方面,包括帧内B帧,用于运动矢量预测的前向和后向缓冲器,直接模式预测信息的位平面编码,B帧的多个运动矢量分辨率/内插滤波器,B帧的主动丢弃和信令 的预测帧丢失。

    Flexible range reduction
    53.
    发明授权
    Flexible range reduction 有权
    弹性范围缩小

    公开(公告)号:US08855202B2

    公开(公告)日:2014-10-07

    申请号:US13191335

    申请日:2011-07-26

    摘要: 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.

    摘要翻译: 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。

    Motion-compensated prediction of inter-layer residuals
    54.
    发明授权
    Motion-compensated prediction of inter-layer residuals 有权
    层间残差运动补偿预测

    公开(公告)号:US08711948B2

    公开(公告)日:2014-04-29

    申请号:US12077768

    申请日:2008-03-21

    IPC分类号: H04N7/12

    摘要: 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.

    摘要翻译: 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。

    Scan patterns for progressive video content
    55.
    发明授权
    Scan patterns for progressive video content 有权
    逐行视频内容的扫描模式

    公开(公告)号:US07782954B2

    公开(公告)日:2010-08-24

    申请号:US10989594

    申请日:2004-11-15

    IPC分类号: H04N7/30 H04N7/50

    摘要: Tools and techniques for applying scan patterns during encoding and decoding of progressive video are described. For example, a video decoder entropy decodes transform coefficients in a one-dimensional array and scans the transform coefficients into a block according to a scan pattern. The block is 8×4, and the scan pattern biases the vertical direction for at least the lowest frequency AC coefficients in the horizontal and vertical directions. Or, the block is 4×8, and the scan pattern biases the horizontal direction for at least the lowest frequency AC coefficients in the horizontal and vertical directions. A corresponding video encoder applies the scan patterns to scan transform coefficients from blocks to one-dimensional arrays.

    摘要翻译: 描述了在逐行视频的编码和解码期间应用扫描模式的工具和技术。 例如,视频解码器熵解码一维阵列中的变换系数,并根据扫描模式将变换系数扫描成块。 该块为8×4,并且扫描图案对于水平和垂直方向上的至少最低频率AC系数偏置垂直方向。 或者,该块为4×8,并且扫描图案在水平和垂直方向上至少对最低频率AC系数偏置水平方向。 相应的视频编码器应用扫描图案来扫描从块到一维阵列的变换系数。

    Flexible range reduction
    56.
    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

    摘要: 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.

    摘要翻译: 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。