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公开(公告)号：US09077960B2
公开(公告)日：2015-07-07
申请号：US11203007
申请日：2005-08-12
IPC分类号： H04N7/12 , H04N19/14 , H04N19/132 , H04N19/176 , H04N19/593 , H04N19/46 , H04N19/91
CPC分类号： H04N19/14 , H04N19/132 , H04N19/176 , H04N19/46 , H04N19/593 , H04N19/91
摘要： A block transform-based digital media codec efficiently compresses digital media data using block patterns representing whether a block's coefficients are zero-valued, such that their explicit encoding is skipped. Because the block patterns can have widely varying probability distributions, the codec adaptively chooses a prediction mode for modifying the block patterns (e.g., based on spatial prediction, or inverting) to enhance their compression using entropy coding techniques. Further, with high spatial correlation of block patterns, the codec encodes a meta block pattern for a region indicating whether all block patterns of the region represent zero-valued coefficient blocks. In such cases, the codec can then also omit explicitly encoding the block patterns in those regions.
摘要翻译： 基于块变换的数字媒体编解码器使用表示块的系数是否为零值的块模式来有效地压缩数字媒体数据，使得它们的显式编码被跳过。 由于块图案可以具有广泛变化的概率分布，所以编解码器自适应地选择用于修改块模式的预测模式（例如，基于空间预测或反转），以使用熵编码技术增强其压缩。 此外，随着块模式的高空间相关性，编解码器编码用于指示该区域的所有块模式是否表示零值系数块的区域的元块模式。 在这种情况下，编解码器也可以省略对这些区域中的块模式的明确编码。
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公开(公告)号：US08054886B2
公开(公告)日：2011-11-08
申请号：US11772070
申请日：2007-06-29
CPC分类号： H04N19/186 , H04N19/46 , H04N19/63 , H04N19/70
摘要： Rules for the signaling and interpretation of chroma position are described. One rule, called the short rule, defines fifteen discrete chroma centering positions and corresponding four-bit syntax element. Another rule, called the extended rule, defines 81 discrete chroma centering positions and corresponding seven-bit syntax elements. A described method includes receiving digital media data at a digital media encoder, determining chroma position information for the received digital media data, and representing the chroma position information with one or more syntax elements in an encoded bitstream. The one or more syntax elements are operable to communicate the chroma position information to a digital media decoder. The chroma position information facilitates an image rotation or flip.
摘要翻译： 描述色度位置信号和解释规则。 称为短规则的一个规则定义了十五个离散色度对中位置和相应的四位语法元素。 称为扩展规则的另一个规则定义了81个离散色度对中位置和相应的七位语法元素。 所描述的方法包括在数字媒体编码器处接收数字媒体数据，确定接收到的数字媒体数据的色度位置信息，并用编码比特流中的一个或多个语法元素表示色度位置信息。 一个或多个语法元素可操作以将色度位置信息传送到数字媒体解码器。 色度位置信息有助于图像旋转或翻转。
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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
CPC分类号： H04N19/00442 , H04N19/30 , H04N19/34 , H04N19/61 , H04N19/63
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。
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4.发明授权Adaptive truncation of transform coefficient data in a transform-based digital media codec 有权在基于变换的数字媒体编解码器中自适应截断变换系数数据公开(公告)号：US08184710B2
公开(公告)日：2012-05-22
申请号：US11772077
申请日：2007-06-29
CPC分类号： H04N19/34 , H04N19/13 , H04N19/184 , H04N19/60
摘要： A block transform-based digital media codec has a signaling scheme and bitstream syntax to flexibly signal that truncation of less significant information bits of transform coefficients coded as an optional layer of the bitstream has been performed adaptively per region or tile of the image.
摘要翻译： 基于块变换的数字媒体编解码器具有信令方案和比特流语法，以灵活地表示每个图像的每个区域或瓦片自适应地执行编码为比特流的可选层的变换系数的较不重要的信息比特的截断。
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公开(公告)号：US20070036222A1
公开(公告)日：2007-02-15
申请号：US11203007
申请日：2005-08-12
IPC分类号： H04N11/04
CPC分类号： H04N19/14 , H04N19/132 , H04N19/176 , H04N19/46 , H04N19/593 , H04N19/91
摘要： A block transform-based digital media codec efficiently compresses digital media data using block patterns representing whether a block's coefficients are zero- valued, such that their explicit encoding is skipped. Because the block patterns can have widely varying probability distributions, the codec adaptively chooses a prediction mode for modifying the block patterns (e.g., based on spatial prediction, or inverting) to enhance their compression using entropy coding techniques. Further, with high spatial correlation of block patterns, the codec encodes a meta block pattern for a region indicating whether all block patterns of the region represent zero-valued coefficient blocks. In such cases, the codec can then also omit explicitly encoding the block patterns in those regions.
摘要翻译： 基于块变换的数字媒体编解码器使用表示块的系数是否为零值的块模式来有效地压缩数字媒体数据，使得它们的显式编码被跳过。 由于块图案可以具有广泛变化的概率分布，所以编解码器自适应地选择用于修改块模式的预测模式（例如，基于空间预测或反转），以使用熵编码技术增强其压缩。 此外，随着块模式的高空间相关性，编解码器编码用于指示该区域的所有块模式是否表示零值系数块的区域的元块模式。 在这种情况下，编解码器也可以省略对这些区域中的块模式的明确编码。
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公开(公告)号：US08369638B2
公开(公告)日：2013-02-05
申请号：US12165474
申请日：2008-06-30
IPC分类号： G06K9/36
CPC分类号： H04N19/00909 , H04N19/122 , H04N19/60 , H04N19/86
摘要： In certain embodiments, to eliminate DC leakage into surrounding AC values, scaling stage within a photo overlap transform operator is modified such that the off-diagonal elements of the associated scaling matrix have the values of 0. In certain embodiments, the on-diagonal scaling matrix are given the values (0.5, 2). In some embodiments, the scaling is performed using a combination of reversible modulo arithmetic and lifting steps. In yet other embodiments, amount of DC leakage is estimated at the encoder, and preprocessing occurs to mitigate amount of leakage, with the bitstream signaling that preprocessing has occurred. A decoder may then read the signal and use the information to mitigate DC leakage.
摘要翻译： 在某些实施例中，为了将DC泄漏消除到周围的AC值中，修改照片重叠变换算子内的缩放阶段，使得相关联的缩放矩阵的非对角元素具有值0.在某些实施例中， 矩阵给出值（0.5,2）。 在一些实施例中，使用可逆模运算和提升步骤的组合来执行缩放。 在其他实施例中，在编码器处估计DC泄漏量，并且发生预处理以减轻泄漏量，同时比特流指示已经发生预处理。 然后，解码器可以读取信号并使用该信息来减轻DC泄漏。
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公开(公告)号：US20090297054A1
公开(公告)日：2009-12-03
申请号：US12165474
申请日：2008-06-30
IPC分类号： G06K9/36
CPC分类号： H04N19/00909 , H04N19/122 , H04N19/60 , H04N19/86
摘要： In certain embodiments, to eliminate DC leakage into surrounding AC values, scaling stage within a photo overlap transform operator is modified such that the off-diagonal elements of the associated scaling matrix have the values of 0. In certain embodiments, the on-diagonal scaling matrix are given the values (0.5, 2). In some embodiments, the scaling is performed using a combination of reversible modulo arithmetic and lifting steps. In yet other embodiments, amount of DC leakage is estimated at the encoder, and preprocessing occurs to mitigate amount of leakage, with the bitstream signaling that preprocessing has occurred. A decoder may then read the signal and use the information to mitigate DC leakage.
摘要翻译： 在某些实施例中，为了将DC泄漏消除到周围的AC值中，修改照片重叠变换算子内的缩放阶段，使得相关联的缩放矩阵的非对角元素具有值0.在某些实施例中， 矩阵给出值（0.5,2）。 在一些实施例中，使用可逆模运算和提升步骤的组合来执行缩放。 在其他实施例中，在编码器处估计DC泄漏量，并且发生预处理以减轻泄漏量，同时比特流指示已经发生预处理。 然后，解码器可以读取信号并使用该信息来减轻DC泄漏。
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公开(公告)号：US20080198936A1
公开(公告)日：2008-08-21
申请号：US11772070
申请日：2007-06-29
IPC分类号： H04N7/12
CPC分类号： H04N19/186 , H04N19/46 , H04N19/63 , H04N19/70
摘要： Rules for the signaling and interpretation of chroma position are described. One rule, called the short rule, defines fifteen discrete chroma centering positions and corresponding four-bit syntax element. Another rule, called the extended rule, defines 81 discrete chroma centering positions and corresponding seven-bit syntax elements. A described method includes receiving digital media data at a digital media encoder, determining chroma position information for the received digital media data, and representing the chroma position information with one or more syntax elements in an encoded bitstream. The one or more syntax elements are operable to communicate the chroma position information to a digital media decoder. The chroma position information facilitates an image rotation or flip.
摘要翻译： 描述色度位置信号和解释规则。 称为短规则的一个规则定义了十五个离散色度对中位置和相应的四位语法元素。 称为扩展规则的另一个规则定义了81个离散色度对中位置和相应的七位语法元素。 所描述的方法包括在数字媒体编码器处接收数字媒体数据，确定接收到的数字媒体数据的色度位置信息，并用编码比特流中的一个或多个语法元素表示色度位置信息。 一个或多个语法元素可操作以将色度位置信息传送到数字媒体解码器。 色度位置信息有助于图像旋转或翻转。
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9.发明授权公开(公告)号：US08953673B2
公开(公告)日：2015-02-10
申请号：US12074030
申请日：2008-02-29
IPC分类号： H04N7/12 , H04N19/186 , H04N19/36 , H04N19/59 , H04N19/33
CPC分类号： H04N19/00315 , H04N19/186 , H04N19/33 , H04N19/36 , H04N19/59
摘要： Techniques and tools are described for scalable video encoding and decoding. In some embodiments, an input frame is downsampled in terms of sample depth and chroma sampling rate, encoded, and output from the encoder as a base layer bitstream. The base layer bitstream is also reconstructed and upsampled to produce a reconstructed bitstream which is subtracted from the original input frame to produce a residual layer. The residual layer is split and encoded as a sample depth residual layer bitstream and a chroma high-pass residual layer bitstream. To recover the encoded input frame, a decoder receives one or more of these bitstreams, decodes them, and combines them to form a reconstructed image. The use of separate codecs is allowed for the base layer and the enhancement layers, without inter-layer dependencies.
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10.发明授权Computational complexity and precision control in transform-based digital media codec 有权基于变换的数字媒体编解码器的计算复杂度和精度控制公开(公告)号：US08942289B2
公开(公告)日：2015-01-27
申请号：US11772076
申请日：2007-06-29
IPC分类号： H04N11/02 , H04N21/6547 , H04N19/122 , H04N19/60 , H04N19/156 , H04N19/46
CPC分类号： H04N21/6547 , H04N19/122 , H04N19/156 , H04N19/46 , H04N19/60
摘要： A digital media encoder/decoder includes signaling of various modes relating to computation complexity and precision at decoding. The encoder may send a syntax element indicating arithmetic precision (e.g., using 16 or 32-bit operations) of the transform operations performed at decoding. The encoder also may signal whether to apply scaling at the decoder output, which permits a wider dynamic range of intermediate data at decoding, but adds to computational complexity due to the scaling operation.
摘要翻译： 数字媒体编码器/解码器包括在解码时与计算复杂性和精度有关的各种模式的信令。 编码器可以发送指示在解码时执行的变换操作的算术精度（例如，使用16或32位操作）的语法元素。 编码器还可以发信号是否在解码器输出端应用缩放，这允许解码时的中间数据的较宽的动态范围，但由于缩放操作而增加了计算复杂度。
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