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    METHOD FOR IMPLEMENTING A QUANTIZER IN A MULTIMEDIA COMPRESSION AND ENCODING SYSTEM
    35.
    发明申请
    METHOD FOR IMPLEMENTING A QUANTIZER IN A MULTIMEDIA COMPRESSION AND ENCODING SYSTEM 审中-公开

    公开(公告)号：US20170318295A1

    公开(公告)日：2017-11-02

    申请号：US15648329

    申请日：2017-07-12

    Applicant: Apple Inc.

    Inventor： Thomas Pun ,  Roger Kumar ,  Xiaochun Nie ,  Hsi-Jung Wu

    IPC: H04N19/126 ,  H04N19/61 ,  H04N19/196 ,  H04N19/146 ,  H04N19/176 ,  H04N19/149 ,  H04N19/625

    CPC classification number: H04N19/126 ,  H04N19/146 ,  H04N19/149 ,  H04N19/176 ,  H04N19/196 ,  H04N19/197 ,  H04N19/61 ,  H04N19/625

    Abstract: Method For Implementing A Quantizer In A Multimedia Compression And Encoding System is disclosed. In the Quantizer system of the present invention, several new quantization ideas are disclosed. In one embodiment, adjacent macroblocks are grouped together into macroblock groups. The macroblock groups are then assigned a common quantizer value. The common quantizer value may be selected based upon how the macroblocks are encoded, the type of macroblocks within the macroblock group (intra-blocks or inter-blocks), the history of the motion vectors associated with the macroblocks in the macroblock group, the residuals of the macroblocks in the macroblock group, and the energy of the macroblocks in the macroblock group. The quantizer value may be adjusted in a manner that is dependent on the current quantizer value. Specifically, if the quantizer value is at the low end of the quantizer scale, then only small adjustments are made. If the quantizer value is at the high end then larger adjustments may be made to the quantizer. Finally, in one embodiment, the quantizer is implemented along with an inverse quantizer for efficient operation.

    Encoding techniques for banding reduction
    39.
    发明授权
    Encoding techniques for banding reduction 有权
    用于条带缩减的编码技术

    公开(公告)号：US09565404B2

    公开(公告)日：2017-02-07

    申请号：US13707404

    申请日：2012-12-06

    Applicant: Apple Inc.

    Inventor： Yeping Su ,  Hsi-Jung Wu ,  Hao Pan

    IPC: H04N7/26 ,  H04N19/10 ,  H04N19/117 ,  H04N19/463 ,  H04N19/14 ,  H04N19/17 ,  H04N19/80 ,  H04N19/176 ,  H04N19/61 ,  H04N19/577

    CPC classification number: H04N19/10 ,  H04N19/117 ,  H04N19/14 ,  H04N19/17 ,  H04N19/176 ,  H04N19/463 ,  H04N19/577 ,  H04N19/61 ,  H04N19/80

    Abstract: Video encoders often produce banding artifacts on areas with smooth gradients and low levels of detail/noise. In this disclosure, a video encoding system identifies the banded areas and adjusts coding parameters accordingly. The video coder may include a pre-coding banding detector and a post-coding banding detector. The pre-coding detector may identify regions in the input picture with smooth gradients that are likely to have banding artifacts after encoding. The post-coding detector may identify regions in the reconstructed picture with visible banding. Usage of pre-coding detector and/or post-coding detector depends on how an encoder operates. In a single-pass encoding or during the first pass of a multi-pass encoding, the pre-coding detection maps are used. During picture re-encoding or during later passes of a multi-pass encoding, the post-coding detector maps are used.

    Abstract translation: 视频编码器经常在平滑梯度和低细节/噪音水平的区域产生带状伪影。 在本公开中，视频编码系统识别带状区域并相应地调整编码参数。 视频编码器可以包括预编码带状检测器和后编码条带检测器。 预编码检测器可以在编码后可能具有可能具有带状伪影的平滑梯度来识别输入图像中的区域。 后编码检测器可以用可见条带识别重建图像中的区域。 预编码检测器和/或后编码检测器的使用取决于编码器如何工作。 在单遍编码中或在多遍编码的第一遍期间，使用预编码检测图。 在图像重新编码期间或在多遍编码的稍后通过期间，使用后编码检测器图。

    VIDEO CODING TECHNIQUES FOR HIGH QUALITY CODING OF LOW MOTION CONTENT
    40.
    发明申请
    VIDEO CODING TECHNIQUES FOR HIGH QUALITY CODING OF LOW MOTION CONTENT 审中-公开
    用于低运动内容高品质编码的视频编码技术

    公开(公告)号：US20160360230A1

    公开(公告)日：2016-12-08

    申请号：US14730975

    申请日：2015-06-04

    Applicant: Apple Inc.

    Inventor： Peikang Song ,  Jae Hoon Kim ,  Xiaosong Zhou ,  Chris Y. Chung ,  Hsi-Jung Wu ,  Dazhong Zhang

    IPC: H04N19/53 ,  H04N19/31 ,  H04N19/137 ,  H04N19/85 ,  H04N19/70 ,  H04N19/117

    Abstract: Techniques for coding video data are described that maintain high precision coding for low motion video content. Such techniques include determining whether a source video sequence to be coded has low motion content. When the source video sequence contains low motion content, the video sequence may be coded as a plurality of coded frames using a chain of temporal prediction references among the coded frames. Thus, a single frame in the source video sequence is coded as a plurality of frames. Because the coded frames each represent identical content, the quality of coding should improve across the plurality of frames. Optionally, the disclosed techniques may increase the resolution at which video is coded to improve precision and coding quality.

    Abstract translation: 描述了用于对视频数据进行编码的技术，其维持低运动视频内容的高精度编码。 这样的技术包括确定要编码的源视频序列是否具有低运动内容。 当源视频序列包含低运动内容时，视频序列可以使用编码帧中的时间预测参考链来编码为多个编码帧。 因此，源视频序列中的单个帧被编码为多个帧。 由于编码帧各自表示相同的内容，所以编码的质量应该跨越多个帧而改善。 可选地，所公开的技术可以增加视频被编码的分辨率，以提高精度和编码质量。

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