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

IPC分类号： H04N7/12 ,  H04N11/02 ,  H04N11/04

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。

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。

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）。

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。

公开(公告)号：US07551789B2

公开(公告)日：2009-06-23

申请号：US12204351

申请日：2008-09-04

申请人： Chengjie Tu ,  Henrique Sarmento Malvar ,  Sridhar Srinivasan

发明人： Chengjie Tu ,  Henrique Sarmento Malvar ,  Sridhar Srinivasan

IPC分类号： G06K9/46

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.

摘要翻译： 使用由单位行列式组件矩阵构成的前置和后置过滤器（或可逆重叠运算符）来实现有效的重叠变换。 前置滤波器和后置滤波器被实现为一系列平面旋转变换和单位行列式平面缩放变换。 平面缩放变换可以使用平面剪切或提升步骤来实现。 此外，平面旋转和平面剪切具有作为可逆/无损操作的实现，从而给出可逆重叠算子。

公开(公告)号：US07305139B2

公开(公告)日：2007-12-04

申请号：US11035991

申请日：2005-01-14

申请人： Sridhar Srinivasan ,  Chengjie Tu

发明人： Sridhar Srinivasan ,  Chengjie Tu

IPC分类号： G06K9/36 ,  G06K9/46

CPC分类号： H04N19/80 ,  H04N19/86

摘要： An efficient lapped transform useable in digital media codecs is realized using a reversible 2-dimensional overlap operator for pre/post filtering that is applied on a staggered grid relative to a core transform. The 2-dimensional lapped operator is based on a separably applied 1-dimensional reversible lapped operator, which is re-arranged as a sequence of elementary transforms in interleaved stages on subsets of points of the respective block and further implemented in lifting steps for computational efficiency. The interleaved stages include applying rotation and scaling stages between initial and final stages involving a normalized 2×2 Hadamard transform.

摘要翻译： 在数字媒体编解码器中可使用的有效的重叠变换是使用用于前/后滤波的可逆二维重叠算子实现的，其用于相对于核心变换的交错网格。 二维重叠运算符基于可分离地应用的一维可逆重叠运算符，其在相应块的点的子集上被重新排列成交织阶段中的基本变换序列，并进一步在提升步骤中实现，用于计算效率 。 交错阶段包括在涉及归一化的2x2 Hadamard变换的初始阶段和最后阶段之间应用旋转和缩放阶段。

公开(公告)号：US20070036225A1

公开(公告)日：2007-02-15

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

IPC分类号： H04N11/04

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。

公开(公告)号：US20060133684A1

公开(公告)日：2006-06-22

申请号：US11035991

申请日：2005-01-14

申请人： Sridhar Srinivasan ,  Chengjie Tu

发明人： Sridhar Srinivasan ,  Chengjie Tu

IPC分类号： G06K9/36

CPC分类号： H04N19/80 ,  H04N19/86

摘要： An efficient lapped transform useable in digital media codecs is realized using a reversible 2-dimensional overlap operator for pre/post filtering that is applied on a staggered grid relative to a core transform. The 2-dimensional lapped operator is based on a separably applied 1-dimensional reversible lapped operator, which is re-arranged as a sequence of elementary transforms in interleaved stages on subsets of points of the respective block and further implemented in lifting steps for computational efficiency. The interleaved stages include applying rotation and scaling stages between initial and final stages involving a normalized 2×2 Hadamard transform

摘要翻译： 在数字媒体编解码器中可用的有效的重叠变换是使用用于前/后滤波的可逆二维重叠算子来实现的，该二维重叠算子被应用在相对于核心变换的交错网格上。 二维重叠运算符基于可分离地应用的一维可逆重叠运算符，其在相应块的点的子集上被重新排列成交织阶段中的基本变换序列，并进一步在提升步骤中实现，用于计算效率 。 交错阶段包括在涉及归一化的2x2 Hadamard变换的初始阶段和最后阶段之间应用旋转和缩放阶段

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.

公开(公告)号：US07949054B2

公开(公告)日：2011-05-24

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： H04N7/18

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。