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公开(公告)号：US20060133682A1
公开(公告)日：2006-06-22
申请号：US11015148
申请日：2004-12-17
申请人： Chengjie Tu , Henrique Malvar , Sridhar Srinivasan
发明人： Chengjie Tu , Henrique Malvar , Sridhar Srinivasan
IPC分类号： G06K9/36
CPC分类号： G10L19/0017 , G06F17/147 , G10L19/0212 , H04N19/119 , H04N19/122 , H04N19/60 , H04N19/61 , H04N19/63 , H04N19/80 , H04N19/86
摘要： An efficient lapped transform is realized using pre- and post-filters (or reversible overlap operators) that are structured of unit determinant component matrices. The pre- and post-filters are realized as a succession of planar rotational transforms and unit determinant planar scaling transforms. The planar scaling transforms can be implemented using planar shears or lifting steps. Further, the planar rotations and planar shears have an implementation as reversible/lossless operations, giving as a result, a reversible overlap operator.
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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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5.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：US08036274B2
公开(公告)日：2011-10-11
申请号：US11203644
申请日：2005-08-12
申请人： Sridhar Srinivasan , Chengjie Tu , Parker Shaw
发明人： Sridhar Srinivasan , Chengjie Tu , Parker Shaw
CPC分类号： H04N19/436 , G06F17/147 , H04N19/42 , H04N19/63
摘要： A block transform-based digital media codec achieves faster performance by re-mapping components of the digital media data into vectors or parallel units on which many operations of the transforms can be performed on a parallel or single-instruction, multiple data (SIMD) basis. In the case of a one-dimensional lapped biorthogonal transform, the digital media data components are re-mapped into vectors on which butterfly stages of both overlap pre-/post-filter and block transform portions of the lapped transform can be performed on a SIMD basis. In the case of a two-dimensional lapped biorthogonal transform, the digital media data components are re-mapped into vectors on which a Hadamard operator of both overlap pre-/post-filter and block transform can be performed on a SIMD basis.
摘要翻译： 基于块变换的数字媒体编解码器通过将数字媒体数据的组件重新映射成矢量或并行单元来实现更快的性能，其中可以在并行或单指令多数据（SIMD）基础上执行许多变换操作 。 在一维重叠双正交变换的情况下，将数字媒体数据分量重新映射成向量，其中可以在SIMD上执行翻转变换的重叠前/后滤波和块变换部分的蝶形阶段 基础。 在二维重叠双正交变换的情况下，将数字媒体数据分量重新映射到可以基于SIMD的基础上执行两者重叠前/后滤波和块变换的Hadamard算子的向量。
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公开(公告)号：US20070280345A1
公开(公告)日：2007-12-06
申请号：US11444685
申请日：2006-06-01
申请人： Chengjie Tu , Sridhar Srinivasan
发明人： Chengjie Tu , Sridhar Srinivasan
IPC分类号： H04B1/66
CPC分类号： H04N19/107 , G06T9/00 , H04N7/24 , H04N19/174 , H04N19/18 , H04N19/186 , H04N19/60 , H04N19/66
摘要： A system, a method and computer-readable media for organizing a bitstream of compressed data that represents an image. The image may be partitioned into independently decodable regions. The portion of the compressed bitstream associated a selected region is decoded. This decoding yields a series of transform coefficients. Areas of the image that surround the selected region are identified, and information associated with these areas is decoded to yield additional transform coefficients. The original series of transform coefficients and the additional transform coefficients are used to reconstruct the selected region of the image.
摘要翻译： 一种用于组织代表图像的压缩数据的比特流的系统，方法和计算机可读介质。 图像可以被划分成独立可解码的区域。 与所选区域相关联的压缩比特流的部分被解码。 该解码产生一系列变换系数。 识别围绕所选区域的图像的区域，并且与这些区域相关联的信息被解码以产生附加的变换系数。 原始系列变换系数和附加变换系数用于重建图像的选定区域。
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公开(公告)号：US20070036224A1
公开(公告)日：2007-02-15
申请号：US11203009
申请日：2005-08-12
申请人： Sridhar Srinivasan , Chengjie Tu
发明人： Sridhar Srinivasan , Chengjie Tu
IPC分类号： H04N11/04
CPC分类号： H04N19/48 , H04N19/105 , H04N19/122 , H04N19/136 , H04N19/18 , H04N19/186 , H04N19/593 , H04N19/60
摘要： A block transform-based digital media codec uses a transform coefficient prediction that takes into account a dominant directionality of the digital media data (e.g., an image with strong horizontal or vertical features), and further operates compatibly with a two-stage transform. For DC and DCAC coefficients from an inner stage transform of a macroblock, the codec calculates and compares directionality metrics based on inner stage transform DC coefficients of neighboring macroblocks to determine dominant directionality. For DCAC coefficients from an outer stage transform of blocks within the macroblock, the codec calculates and compares directionality metrics based on the inner stage transform DCAC coefficients of the macroblock to detect dominant directionality. The determination of directional dominance can also take into account information from other channels (e.g., chrominance as well as luminance).
摘要翻译： 基于块变换的数字媒体编解码器使用考虑了数字媒体数据（例如，具有强大的水平或垂直特征的图像）的主要方向性的变换系数预测，并进一步与两阶段变换兼容。 对于来自宏块的内部级变换的DC和DCAC系数，编解码器基于相邻宏块的内部级变换DC系数计算并比较方向性度量，以确定主要方向性。 对于来自宏块内的块的外级变换的DCAC系数，编解码器基于宏块的内部级变换DCAC系数来计算并比较方向性度量，以检测主导方向性。 方向优势的确定还可以考虑来自其他信道的信息（例如，色度以及亮度）。
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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：US08711925B2
公开(公告)日：2014-04-29
申请号：US11418690
申请日：2006-05-05
申请人： Chengjie Tu , Sridhar Srinivasan
发明人： Chengjie Tu , Sridhar Srinivasan
IPC分类号： H04N7/12
CPC分类号： H04N19/124 , H04N19/126 , H04N19/136 , H04N19/176 , H04N19/46 , H04N19/61
摘要： A digital media encoder/decoder uses a flexible quantization technique that provides the ability to vary quantization along various dimensions of the encoded digital media data, including spatial, frequency sub bands and color channels. The codec utilizes a signaling scheme to signal various permutations of flexible quantization combinations efficiently for primary usage scenarios. When a choice of quantizer is available, the codec efficiently encodes the current quantizer by defining a subset of quantizers and indexes the current quantizer from the set.
摘要翻译： 数字媒体编码器/解码器使用灵活的量化技术，其提供沿编码的数字媒体数据（包括空间，频率子带和颜色信道）的各个维度改变量化的能力。 该编解码器利用信令方案为主要使用场景有效地发送灵活量化组合的各种排列。 当量化器的选择可用时，编解码器通过定义量化器的子集并且从集合中对当前量化器进行索引来有效地对当前量化器进行编码。
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