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    METHOD AND APPARATUS FOR VARIABLE ACCURACY INTER-PICTURE TIMING SPECIFICATION FOR DIGITAL VIDEO ENCODING
    4.
    发明申请
    METHOD AND APPARATUS FOR VARIABLE ACCURACY INTER-PICTURE TIMING SPECIFICATION FOR DIGITAL VIDEO ENCODING 审中-公开
    用于数字视频编码的可变精度互联时序规范的方法和装置

    公开(公告)号：US20170054994A1

    公开(公告)日：2017-02-23

    申请号：US15340976

    申请日：2016-11-01

    Applicant: Apple Inc.

    Inventor： Barin Geoffry Haskell ,  David William Singer ,  Adriana Dumitras ,  Atul Puri

    IPC: H04N19/513 ,  H04N19/43 ,  H04N19/577 ,  H04N19/176

    CPC classification number: H04N19/513 ,  G06T9/005 ,  H04N19/13 ,  H04N19/132 ,  H04N19/176 ,  H04N19/40 ,  H04N19/43 ,  H04N19/44 ,  H04N19/46 ,  H04N19/503 ,  H04N19/51 ,  H04N19/577 ,  H04N19/587 ,  H04N19/61 ,  H04N19/91 ,  H04N21/4305

    Abstract: A method and apparatus for variable accuracy inter-picture timing specification for digital video encoding is disclosed. Specifically, the present invention discloses a system that allows the relative timing of nearby video pictures to be encoded in a very efficient manner. In one embodiment, the display time difference between a current video picture and a nearby video picture is determined. The display time difference is then encoded into a digital representation of the video picture. In a preferred embodiment, the nearby video picture is the most recently transmitted stored picture. For coding efficiency, the display time difference may be encoded using a variable length coding system or arithmetic coding. In an alternate embodiment, the display time difference is encoded as a power of two to reduce the number of bits transmitted.

    Abstract translation: 公开了一种用于数字视频编码的可变精度画面间时序规范的方法和装置。 具体地说，本发明公开了一种允许以非常有效的方式编码附近视频图像的相对定时的系统。 在一个实施例中，确定当前视频图像和附近视频图像之间的显示时间差。 然后将显示时间差编码为视频图像的数字表示。 在优选实施例中，附近的视频图像是最近发送的存储图像。 对于编码效率，可以使用可变长度编码系统或算术编码对显示时间差进行编码。 在替代实施例中，显示时间差被编码为2的幂，以减少发送的比特数。

    METHOD AND APPARATUS FOR VARIABLE ACCURACY INTER-PICTURE TIMING SPECIFICATION FOR DIGITAL VIDEO ENCODING
    6.
    发明申请
    METHOD AND APPARATUS FOR VARIABLE ACCURACY INTER-PICTURE TIMING SPECIFICATION FOR DIGITAL VIDEO ENCODING 审中-公开
    用于数字视频编码的可变精度互联时序规范的方法和装置

    公开(公告)号：US20150049815A1

    公开(公告)日：2015-02-19

    申请号：US14462396

    申请日：2014-08-18

    Applicant: Apple Inc.

    Inventor： Barin Geoffry Haskell ,  David William Singer ,  Adriana Dumitras ,  Atul Puri

    IPC: H04N19/513 ,  H04N19/577

    CPC classification number: H04N19/513 ,  G06T9/005 ,  H04N19/13 ,  H04N19/132 ,  H04N19/176 ,  H04N19/40 ,  H04N19/43 ,  H04N19/44 ,  H04N19/46 ,  H04N19/503 ,  H04N19/51 ,  H04N19/577 ,  H04N19/587 ,  H04N19/61 ,  H04N19/91 ,  H04N21/4305

    Abstract: A method and apparatus for variable accuracy inter-picture timing specification for digital video encoding is disclosed. Specifically, the present invention discloses a system that allows the relative timing of nearby video pictures to be encoded in a very efficient manner. In one embodiment, the display time difference between a current video picture and a nearby video picture is determined. The display time difference is then encoded into a digital representation of the video picture. In a preferred embodiment, the nearby video picture is the most recently transmitted stored picture. For coding efficiency, the display time difference may be encoded using a variable length coding system or arithmetic coding. In an alternate embodiment, the display time difference is encoded as a power of two to reduce the number of bits transmitted.

    Abstract translation: 公开了一种用于数字视频编码的可变精度画面间时序规范的方法和装置。 具体地说，本发明公开了一种允许以非常有效的方式编码附近视频图像的相对定时的系统。 在一个实施例中，确定当前视频图像和附近视频图像之间的显示时间差。 然后将显示时间差编码为视频图像的数字表示。 在优选实施例中，附近的视频图像是最近发送的存储图像。 对于编码效率，可以使用可变长度编码系统或算术编码对显示时间差进行编码。 在替代实施例中，显示时间差被编码为2的幂，以减少发送的比特数。

    Method and Apparatus For Improved Coding Mode Selection
    7.
    发明申请
    Method and Apparatus For Improved Coding Mode Selection 审中-公开
    改进编码模式选择的方法和装置

    公开(公告)号：US20140362903A1

    公开(公告)日：2014-12-11

    申请号：US14307419

    申请日：2014-06-17

    Applicant: Apple Inc.

    Inventor： Adriana Dumitras ,  Barin Geoffry Haskell ,  Atul Puri

    IPC: H04N19/105 ,  H04N19/154

    CPC classification number: H04N19/154 ,  H04N19/00 ,  H04N19/103 ,  H04N19/105 ,  H04N19/147 ,  H04N19/176 ,  H04N19/19 ,  H04N19/52 ,  H04N19/61

    Abstract: In this disclosure, a novel method for direct mode enhancement in B-pictures and skip mode enhancement in P-pictures in the framework of H.264 (MPEG-4/Part 10) is disclosed. Direct mode and skip mode enhancements are achieved by clustering the values of the Lagrangian, removing outliers and specifying smaller values of the Lagrangian multiplier in the rate-distortion optimization for encoding mode selection. Experimental results using high quality video sequences show that bit rate reduction is obtained using the method of the present invention, at the expense of a slight loss in peak signal-to-noise ratio (PSNR). By conducting two different experiments, it has been verified that no subjective visual loss is visible despite the peak signal-to-noise ratio change. In relationship to the existing rate-distortion optimization methods currently employed in the (non-normative) MPEG-4/Part 10 encoder, the method of the present invention represents a simple and useful add-on. More importantly, when other solutions such as further increasing the values of the quantization parameter are not applicable, as inadmissible artifacts would be introduced in the decoded pictures, the method of the present invention achieves bit rate reduction without introducing visible distortion in the decoded sequences. Even more, despite the fact that the present document makes use of the H.264 framework, the proposed method is applicable in any video encoding system that employs rate-distortion optimization for encoding mode selection.

    Abstract translation: 在本公开中，公开了一种用于H.264（MPEG-4 / Part 10）的框架中的P图像中的B图像和跳过模式增强中的直接模式增强的新颖方法。 直接模式和跳过模式增强是通过对拉格朗日数值进行聚类来实现的，该值是在编码模式选择的速率失真优化中去除异常值并指定较小的拉格朗日乘数值。 使用高质量视频序列的实验结果表明，使用本发明的方法可以以峰值信噪比（PSNR）的轻微损失为代价来获得比特率降低。 通过进行两个不同的实验，已经证实，尽管峰值信噪比变化，没有主观视觉损失是可见的。 与目前在（非规范性）MPEG-4 / Part 10编码器中使用的速率失真优化方法有关，本发明的方法代表了一种简单而有用的附加组件。 更为重要的是，当进一步增加量化参数值的其他解决方案不适用时，由于不可接受的伪像将被引入到解码图像中，所以本发明的方法实现比特率降低而不引入解码序列中的可见失真。 更重要的是，尽管本文件使用H.264框架，但是所提出的方法可应用于采用速率失真优化用于编码模式选择的任何视频编码系统。

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