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    Methods for encoding or decoding in a videoconference system to reduce problems associated with noisy image acquisition
    2.
    发明授权
    Methods for encoding or decoding in a videoconference system to reduce problems associated with noisy image acquisition 有权
    在视频会议系统中进行编码或解码的方法，以减少与噪声图像采集相关的问题

    公开(公告)号：US07782940B2

    公开(公告)日：2010-08-24

    申请号：US10633137

    申请日：2003-08-01

    申请人： Mohammad Athar Shah ,  Michael J. Horowitz

    发明人： Mohammad Athar Shah ,  Michael J. Horowitz

    IPC分类号： H04N7/18

    CPC分类号： H04N7/15 ,  H04N19/105 ,  H04N19/132 ,  H04N19/134 ,  H04N19/136 ,  H04N19/137 ,  H04N19/159 ,  H04N19/176 ,  H04N19/196 ,  H04N19/197 ,  H04N19/198 ,  H04N19/507 ,  H04N19/587 ,  H04N19/61

    摘要： Disclosed herein in one embodiment is an adaptive coding threshold algorithm for a videoconference system which alleviates problems due to the erroneous recoding of stationary areas of images caused by image noise. The algorithm, which is preferably implementable on a videoconference encoder, assesses the coding parameters for a current macroblock and the coding parameters for that same macroblock the last time it was coded. If for both macroblocks the coding was non-intra, with a [0,0] motion vector, and with a low quantization parameter, a determination is made that the current macroblock depicts a stationary image. Accordingly, the algorithm increases the coding threshold (T1) for the blocks within that macroblock, so that it becomes more difficult for those particular blocks to be recoded. This renders the block with stationary content less susceptible to erroneous recoding, while preserving system bandwidth and improving image quality. Additionally, related noise assessment techniques can be employed at the encoder or decoder without the adjustment of the coding threshold T1.

    摘要翻译： 这里在一个实施例中公开了一种用于视频会议系统的自适应编码阈值算法，其减轻了由图像噪声引起的图像的静止区域的错误重新编码的问题。 优选地在视频会议编码器上可实现的算法评估当前宏块的编码参数以及上次编码时相同宏块的编码参数。 如果对于两个宏块，编码是非内部的，具有[0,0]运动矢量，并且在低量化参数下，确定当前宏块描绘静止图像。 因此，该算法增加了该宏块内的块的编码阈值（T1），使得这些特定块变得更加难以重新编码。 这使得具有固定内容的块不太容易被错误的重新编码，同时保持系统带宽并提高图像质量。 此外，相关的噪声评估技术可以在编码器或解码器处采用，而不需要调整编码阈值T1。

    DE-BLOCKING FILTER ARRANGEMENTS
    3.
    发明申请
    DE-BLOCKING FILTER ARRANGEMENTS 审中-公开
    阻塞滤波器安排

    公开(公告)号：US20080267297A1

    公开(公告)日：2008-10-30

    申请号：US12109695

    申请日：2008-04-25

    申请人： Jesus Sampedro ,  Athar Shah ,  Stephen Botzko

    发明人： Jesus Sampedro ,  Athar Shah ,  Stephen Botzko

    IPC分类号： H04N11/02

    CPC分类号： H04N19/439 ,  H04N19/117 ,  H04N19/136 ,  H04N19/174 ,  H04N19/176 ,  H04N19/194 ,  H04N19/46 ,  H04N19/61 ,  H04N19/82 ,  H04N19/85 ,  H04N19/86

    摘要： Described herein is a de-blocking filter arrangement for video encoders and decoders that include a de-blocking loop filter. In some embodiments, the post filter may be configured to process all edges that were not processed by the loop filter. In other embodiments the encoder may specify which edges should be processed by the loop filter and/or by the post filter. Also disclosed herein is a de-blocking filter arrangement for video encoders and decoders that include first and second de-blocking loop filters. The second loop filter is configured to operate only on slice boundaries that were not processed by the first loop filter, e.g., for one of the reasons described above.

    摘要翻译： 这里描述的是用于视频编码器和解码器的解块滤波器装置，其包括解块环路滤波器。 在一些实施例中，后置滤波器可以被配置为处理未被环路滤波器处理的所有边缘。 在其他实施例中，编码器可以指定应由环路滤波器和/或后置滤波器处理哪些边缘。 本文还公开了一种用于视频编码器和解码器的解块滤波器装置，其包括第一和第二去阻塞环路滤波器。 第二环路滤波器被配置为仅对未由第一环路滤波器处理的片段边界进行操作，例如由于上述原因之一。

    Adaptive filter to improve H-264 video quality
    6.
    发明申请
    Adaptive filter to improve H-264 video quality 失效
    自适应滤波器提高H-264视频质量

    公开(公告)号：US20050025236A1

    公开(公告)日：2005-02-03

    申请号：US10633273

    申请日：2003-08-01

    申请人： Yong Yan ,  Michael Horowitz ,  Athar Shah ,  Richard Hall

    发明人： Yong Yan ,  Michael Horowitz ,  Athar Shah ,  Richard Hall

    IPC分类号： H04N7/12 ,  H04N7/26

    CPC分类号： H04N19/86 ,  H04N19/80

    摘要： A method for reducing or eliminating coding artifacts in video pictures processed using intra block prediction methods, for example, according to the H.264 standard. The causes of the coding artifacts are identified to be the intra prediction modes with prediction directions that are not in the direction of the raster scan. Filtering the affected blocks with a simple one-dimensional spatial filter will reduce or even eliminate these coding artifacts.

    摘要翻译： 一种减少或消除使用帧内预测方法处理的视频图像中的伪像的方法，例如根据H.264标准。 编码伪像的原因被识别为具有不在光栅扫描方向上的预测方向的帧内预测模式。 用简单的一维空间过滤器过滤受影响的块将减少甚至消除这些编码工件。

    Adaptive filter to improve H-264 video quality
    7.
    发明授权
    Adaptive filter to improve H-264 video quality 失效
    自适应滤波器提高H-264视频质量

    公开(公告)号：US07289562B2

    公开(公告)日：2007-10-30

    申请号：US10633273

    申请日：2003-08-01

    申请人： Yong Yan ,  Michael Horowitz ,  Athar Shah ,  Richard Hall

    发明人： Yong Yan ,  Michael Horowitz ,  Athar Shah ,  Richard Hall

    IPC分类号： H04N7/12 ,  H04N11/02 ,  G06K9/40

    CPC分类号： H04N19/86 ,  H04N19/80

    摘要： A method for reducing or eliminating coding artifacts in video pictures processed using intra block prediction methods, for example, according to the H.264 standard. The causes of the coding artifacts are identified to be the intra prediction modes with prediction directions that are not in the direction of the raster scan. Filtering the affected blocks with a simple one-dimensional spatial filter will reduce or even eliminate these coding artifacts.

    摘要翻译： 一种减少或消除使用帧内预测方法处理的视频图像中的伪像的方法，例如根据H.264标准。 编码伪像的原因被识别为具有不在光栅扫描方向上的预测方向的帧内预测模式。 用简单的一维空间过滤器过滤受影响的块将减少甚至消除这些编码工件。