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    Adaptive vertical macroblock alignment for mixed frame video sequences
    22.
    发明申请
    Adaptive vertical macroblock alignment for mixed frame video sequences 有权
    用于混合帧视频序列的自适应垂直宏块对准

    公开(公告)号：US20060072668A1

    公开(公告)日：2006-04-06

    申请号：US10960380

    申请日：2004-10-06

    申请人： Sridhar Srinivasan ,  Chih-Lung Lin ,  Thomas Holcomb ,  Pohsiang Hsu

    发明人： Sridhar Srinivasan ,  Chih-Lung Lin ,  Thomas Holcomb ,  Pohsiang Hsu

    IPC分类号： H04N11/02 ,  H04N11/04 ,  H04N7/12 ,  H04B1/66

    CPC分类号： H04N19/136 ,  H04N7/012 ,  H04N19/119 ,  H04N19/172

    摘要： A video codec provides for adaptive vertical macroblock alignment of mixed interlaced and progressive video sequences. With adaptive vertical macroblock alignment, a video codec enforces a macroblock alignment height restriction on per picture basis, rather than requiring that all frames in a sequence adhere to a uniform height restriction. The video codec can then apply less padding to progressive and like type pictures that have smaller macroblock alignment increments, than to interlaced type pictures with larger alignment increments, which can save significant compression overhead.

    摘要翻译： 视频编解码器提供混合隔行和逐行视频序列的自适应垂直宏块对准。 利用自适应垂直宏块对准，视频编解码器在每个图像基础上执行宏块对准高度限制，而不是要求序列中的所有帧都符合均匀的高度限制。 然后，视频编解码器可以对具有较小的宏块对准增量的逐行和类似类型的图像施加较少的填充，而不是具有较大对准增量的隔行扫描型图像，这可以节省显着的压缩开销。

    Fractional quantization step sizes for high bit rates
    23.
    发明申请
    Fractional quantization step sizes for high bit rates 有权
    高比特率的分数量化步长

    公开(公告)号：US20050238096A1

    公开(公告)日：2005-10-27

    申请号：US10893167

    申请日：2004-07-17

    申请人： Thomas Holcomb ,  Sridhar Srinivasan ,  Pohsiang Hsu ,  Chih-Lung Lin

    发明人： Thomas Holcomb ,  Sridhar Srinivasan ,  Pohsiang Hsu ,  Chih-Lung Lin

    IPC分类号： G06K9/36 ,  G06K9/46 ,  H04N7/12 ,  H04N7/26 ,  H04N7/50

    CPC分类号： H04N19/17 ,  H04N19/124 ,  H04N19/126 ,  H04N19/136 ,  H04N19/137 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46 ,  H04N19/61 ,  H04N19/70

    摘要： At high bit rates, the reconstruction error of compressed video is generally proportional to the squared value of quantization step size, such that full quantization step size increments at high bit rates can lead to significant change in the reconstruction error and/or bit rate of the compressed video. A video codec uses fractional increments of quantization step size at high bit rates to permit a more continuous variation of quality and/or bit rate as the quantization scale changes. For high bit rate scenarios, the bit stream syntax includes an additional syntax element to specify fractional step increments (e.g., half step) of the normal quantizer scale step sizes.

    摘要翻译： 在高比特率下，压缩视频的重构误差通常与量化步长的平方值成比例，使得在高比特率下的全量化步长增加可导致重构误差和/或比特率的显着变化 压缩视频。 视频编解码器以高比特率使用量化步长的分数增量，以允许质量和/或比特率随着量化比例的变化而更连续地变化。 对于高比特率场景，比特流语法包括额外的语法元素，用于指定正常量化器缩放步长的分数阶增量（例如，半步长）。

    Chrominance motion vector rounding
    26.
    发明授权
    Chrominance motion vector rounding 有权

    公开(公告)号：US07116831B2

    公开(公告)日：2006-10-03

    申请号：US10379615

    申请日：2003-03-04

    申请人： Kunal Mukerjee ,  Sridhar Srinivasan

    发明人： Kunal Mukerjee ,  Sridhar Srinivasan

    IPC分类号： G06K9/36 ,  G06K9/46

    CPC分类号： H04N19/523 ,  H04N19/117 ,  H04N19/162

    摘要： Various techniques and tools for chrominance motion vector rounding are described. For example, during motion compensation, a video encoder or decoder converts luminance motion vectors into chrominance motion vector having quarter-pixel accuracy. Or, during motion compensation, a video encoder or decoder converts luminance motion vectors into chrominance motion vectors using one of multiple available chrominance motion vector rounding modes.

    Advanced bi-directional predictive coding of video frames
    27.
    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

    申请人： Kunal Mukerjee ,  Sridhar Srinivasan ,  Bruce Chih-Lung Lin

    发明人： Kunal Mukerjee ,  Sridhar Srinivasan ,  Bruce Chih-Lung Lin

    IPC分类号： H04N7/12 ,  H04N11/02 ,  H04N11/04 ,  H04B1/66

    CPC分类号： H04N19/577 ,  H04N19/132 ,  H04N19/56 ,  H04N19/587

    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。

    Fractional quantization step sizes for high bit rates
    28.
    发明授权
    Fractional quantization step sizes for high bit rates 有权
    高比特率的分数量化步长

    公开(公告)号：US08218624B2

    公开(公告)日：2012-07-10

    申请号：US10893167

    申请日：2004-07-17

    申请人： Thomas W. Holcomb ,  Sridhar Srinivasan ,  Pohsiang Hsu ,  Chih-Lung Lin

    发明人： Thomas W. Holcomb ,  Sridhar Srinivasan ,  Pohsiang Hsu ,  Chih-Lung Lin

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

    CPC分类号： H04N19/17 ,  H04N19/124 ,  H04N19/126 ,  H04N19/136 ,  H04N19/137 ,  H04N19/176 ,  H04N19/18 ,  H04N19/46 ,  H04N19/61 ,  H04N19/70

    摘要： At high bit rates, the reconstruction error of compressed video is generally proportional to the squared value of quantization step size, such that full quantization step size increments at high bit rates can lead to significant change in the reconstruction error and/or bit rate of the compressed video. A video codec uses fractional increments of quantization step size at high bit rates to permit a more continuous variation of quality and/or bit rate as the quantization scale changes. For high bit rate scenarios, the bit stream syntax includes an additional syntax element to specify fractional step increments (e.g., half step) of the normal quantizer scale step sizes.

    摘要翻译： 在高比特率下，压缩视频的重构误差通常与量化步长的平方值成比例，使得在高比特率下的全量化步长增加可导致重构误差和/或比特率的显着变化 压缩视频。 视频编解码器以高比特率使用量化步长的分数增量，以允许质量和/或比特率随着量化比例的变化而更连续地变化。 对于高比特率场景，比特流语法包括额外的语法元素，用于指定正常量化器缩放步长的分数阶增量（例如，半步长）。

    Efficient repeat padding for hybrid video sequence with arbitrary video resolution
    29.
    发明授权
    Efficient repeat padding for hybrid video sequence with arbitrary video resolution 有权
    用于具有任意视频分辨率的混合视频序列的高效重复填充

    公开(公告)号：US07822123B2

    公开(公告)日：2010-10-26

    申请号：US10960384

    申请日：2004-10-06

    申请人： Chih-Lung Lin ,  Pohsiang Hsu ,  Sridhar Srinivasan ,  Thomas W. Holcomb

    发明人： Chih-Lung Lin ,  Pohsiang Hsu ,  Sridhar Srinivasan ,  Thomas W. Holcomb

    IPC分类号： H04N7/12

    CPC分类号： H04N19/59 ,  H04N19/102 ,  H04N19/119 ,  H04N19/16 ,  H04N19/172 ,  H04N19/176 ,  H04N19/46 ,  H04N19/563 ,  H04N19/61 ,  H04N19/70

    摘要： A video codec provides efficient repeat padding of hybrid video sequences having arbitrary video resolution. The video codec repeat pads to expand the active content of pictures in the video sequence out to meet an adaptive vertical macroblock alignment restriction that varies by picture type. For progressive type pictures, the video codec repeats the last row or horizontal boundary edge of the active content. For interlaced type pictures, the video coded repeats the last two rows (last row of each interlaced field) of the active content. This repeat padding differing by picture type provides a better prediction (lower prediction error residual) for macroblocks in following predicted frames whose motion vector points into the padded region.

    摘要翻译： 视频编解码器提供具有任意视频分辨率的混合视频序列的有效重复填充。 视频编解码器重复播放以扩展视频序列中的图像的活动内容，以满足由图像类型变化的自适应垂直宏块对准限制。 对于渐进式图像，视频编解码器重复活动内容的最后一行或水平边界边缘。 对于隔行扫描型图像，视频编码重复活动内容的最后两行（每个隔行字段的最后一行）。 这种不同于图像类型的重复填充对于其运动向量指向填充区域的后续预测帧中的宏块提供了更好的预测（较低的预测误差残差）。