公开(公告)号：US20130107969A1

公开(公告)日：2013-05-02

申请号：US13286336

申请日：2011-11-01

申请人： Nguyen NGUYEN ,  Tianying Ji ,  Dake He

发明人： Nguyen NGUYEN ,  Tianying Ji ,  Dake He

IPC分类号： H04N7/30

CPC分类号： H04N19/122 ,  H04N19/13 ,  H04N19/132 ,  H04N19/136 ,  H04N19/157 ,  H04N19/159 ,  H04N19/172 ,  H04N19/18 ,  H04N19/196 ,  H04N19/61 ,  H04N19/70 ,  H04N19/91

摘要： Methods of encoding and decoding for video data are described in which multi-level significance maps are used in the encoding and decoding processes. The significant-coefficient flags that form the significance map are grouped into contiguous groups, and a significant-coefficient-group flag signifies for each group whether that group contains no non-zero significant-coefficient flags. If there are no non-zero significant-coefficient flags in the group, then the significant-coefficient-group flag is set to zero. The set of significant-coefficient-group flags is encoded in the bitstream. Any significant-coefficient flags that fall within a group that has a significant-coefficient-group flag that is non-zero are encoded in the bitstream, whereas significant-coefficient flags that fall within a group that has a significant-coefficient-group flag that is zero are not encoded in the bitstream.

公开(公告)号：US08400336B2

公开(公告)日：2013-03-19

申请号：US13089599

申请日：2011-04-19

申请人： Dake He ,  Gaëlle Christine Martin-Cocher ,  Gergely Ferenc Korodi

发明人： Dake He ,  Gaëlle Christine Martin-Cocher ,  Gergely Ferenc Korodi

IPC分类号： H03M7/30

CPC分类号： H03M7/40

摘要： A method for parallel context modeling through reordering the bits of an input sequence to form groups of bits in accordance with a context model-specific reordering schedule. The reordering schedule is developed such that the groups of bits are formed to satisfy two conditions: first, that the context for each of the bits in a group of bits is different from the context of each of the other bits in that group, and the context of each of the bits in that group is determined independently from each of the other bits in that group. The parallel context modeling may be used in encoding or decoding operations.

摘要翻译： 一种用于通过根据上下文模型特定的重排序表重新排序输入序列的比特以形成比特组的并行上下文建模的方法。 重新排序调度被开发成使得位组被形成为满足两个条件：首先，位组中的每个比特的上下文不同于该组中的每个其他比特的上下文，并且 该组中每个位的上下文独立于该组中的每个其他位确定。 并行上下文建模可用于编码或解码操作。

公开(公告)号：US08340188B2

公开(公告)日：2012-12-25

申请号：US12684298

申请日：2010-01-08

申请人： Xun Shi ,  Xiang Yu ,  Dake He

发明人： Xun Shi ,  Xiang Yu ,  Dake He

IPC分类号： H04B1/66 ,  H04N7/12

CPC分类号： H04N19/59 ,  H04N19/109 ,  H04N19/147 ,  H04N19/176 ,  H04N19/40 ,  H04N19/52 ,  H04N19/57 ,  H04N19/61

摘要： A transcoder and methods of encoding inter-prediction frames of a downsampled video wherein the downsampled video is a spatially downsampled version of a full-resolution video. Full-resolution motion vectors are downscaled and each downscaled motion vector pinpoints a search area within a reference frame. The union or combination of search areas defines the search field for candidate motion vectors. A motion vector is selected from the candidates based on realizing a minimum rate-distortion cost.

摘要翻译： 代码转换器和对下采样视频的帧间预测帧进行编码的方法，其中下采样视频是全分辨率视频的空间下采样版本。 全分辨率运动矢量被缩小，每个缩小的运动矢量精确定位参考帧内的搜索区域。 搜索区域的联合或组合定义候选运动矢量的搜索字段。 基于实现最小速率失真成本从候选中选择运动矢量。

公开(公告)号：US08315310B2

公开(公告)日：2012-11-20

申请号：US12684219

申请日：2010-01-08

申请人： Xun Shi ,  Xiang Yu ,  Dake He

发明人： Xun Shi ,  Xiang Yu ,  Dake He

IPC分类号： H04B1/66 ,  H04N5/14

CPC分类号： H04N19/59 ,  H04N19/109 ,  H04N19/132 ,  H04N19/139 ,  H04N19/176 ,  H04N19/40 ,  H04N19/52 ,  H04N19/61

摘要： A transcoder and methods of encoding inter-prediction frames of a downsampled video wherein the downsampled video is a spatially downsampled version of a full-resolution video. Full-resolution motion vectors are downscaled and a weighting factor is calculated for each downscaled motion vector based upon the transform domain residual coefficients associated with that full-resolution motion vector. A motion vector prediction is made based on the weighted average using the downscaled motion vectors and their weighting factors.

摘要翻译： 代码转换器和对下采样视频的帧间预测帧进行编码的方法，其中下采样视频是全分辨率视频的空间下采样版本。 基于与该全分辨率运动矢量相关联的变换域剩余系数，对全分辨率运动矢量进行缩减，并且为每个缩小的运动矢量计算加权因子。 基于使用缩小运动矢量及其加权因子的加权平均值进行运动矢量预测。

公开(公告)号：US08111755B2

公开(公告)日：2012-02-07

申请号：US12145920

申请日：2008-06-25

申请人： Dake He ,  Ashish Jagmohan

发明人： Dake He ,  Ashish Jagmohan

IPC分类号： H04N7/12

CPC分类号： H04N19/395 ,  H04N19/513 ,  H04N19/537 ,  H04N19/59 ,  H04N19/80

摘要： A method and system for low-complexity Slepian-Wolf rate estimator in a hybrid Wyner-Ziv video encoder determines the minimum Slepian-Wolf code rate required to allow correct decoding. The Slepian-Wolf estimator does not assume ideality of source and side-information statistics and does not require the presence of a feedback channel from the decoder to the encoder in order to determine the correct Slepian-Wolf coding rate. Instead, it adapts to the statistical properties of the video steam. The Slepian-Wolf estimator provides very efficient compression performance while avoiding Slepian-Wolf decoding failures.

摘要翻译： 混合Wyner-Ziv视频编码器中的低复杂度Slepian-Wolf速率估计器的方法和系统确定了允许正确解码所需的最小Slepian-Wolf码率。 Slepian-Wolf估计器不假定源和侧信息统计的理想，并且不需要存在从解码器到编码器的反馈信道，以便确定正确的Slepian-Wolf编码率。 相反，它适应视频流的统计特性。 Slepian-Wolf估计器提供非常有效的压缩性能，同时避免Slepian-Wolf解码失败。

公开(公告)号：US08077064B2

公开(公告)日：2011-12-13

申请号：US12713576

申请日：2010-02-26

申请人： Gergely Ferenc Korodi ,  Dake He

发明人： Gergely Ferenc Korodi ,  Dake He

IPC分类号： H03M7/00

CPC分类号： H03M7/40

摘要： A method for encoding an input sequence of symbols. The method includes, sequentially, for each symbol in the input sequence, determining an estimated probability for that symbol based on a context model, identifying a codeword associated with a sequence of symbols resulting from appending that symbol to a previous sequence of symbols associated with that estimated probability, using an encoding tree associated with that estimated probability, and storing the codeword in a buffer element of a first-in-first-out buffer, wherein the buffer element is associated with the estimated probability. Stored codewords are output from the buffer in a first-in-first-out order.

摘要翻译： 一种编码输入符号序列的方法。 该方法包括依次为输入序列中的每个符号确定基于上下文模型的该符号的估计概率，识别与由该符号序列相关联的符号序列相关联的码元与之前相关联的符号相关联的码元相关联的码字 估计概率，使用与该估计概率相关联的编码树，以及将码字存储在先进先出缓冲器的缓冲器元件中，其中缓冲器元件与估计的概率相关联。 以先入先出的顺序从缓冲器输出存储的代码字。

公开(公告)号：US20110285557A1

公开(公告)日：2011-11-24

申请号：US13112597

申请日：2011-05-20

申请人： Gergely Ferenc KORODI ,  Dake He

发明人： Gergely Ferenc KORODI ,  Dake He

IPC分类号： H03M5/00

CPC分类号： H03M7/4006

摘要： Methods and systems are described for combining sources in a data compression system. In a system in which a context model results in the production of multiple sources or symbols, each source being associated with a probability estimate, sources may be combined by defining another, reduced size, set of probabilities. The new set of probabilities may be a subset of the predefined set of probabilities provided by the context model. Minimizing relative entropy may be a basis upon which to define a mapping of predefined probabilities to the new set of probabilities. An input sequence that was modeled using the context model may then be entropy encoded and entropy decoded using the new set of probabilities based on a mapping between the new probabilities and the predefined probabilities.

摘要翻译： 描述了用于在数据压缩系统中组合源的方法和系统。 在上下文模型导致产生多个源或符号的系统中，每个源与概率估计相关联，源可以通过定义另一个缩小的大小的概率集合来组合。 新的概率集合可以是由上下文模型提供的预定义概率集合的子集。 最小化相对熵可以是将预定义概率映射到新的概率集合的基础。 然后使用上下文模型建模的输入序列可以基于新概率和预定义概率之间的映射，使用新的概率集进行熵编码和熵解码。

公开(公告)号：US20110200104A1

公开(公告)日：2011-08-18

申请号：US12707797

申请日：2010-02-18

申请人： Gergely Ferenc KORODI ,  Dake He ,  En-Hui Yang

发明人： Gergely Ferenc KORODI ,  Dake He ,  En-Hui Yang

IPC分类号： H04N7/12 ,  H03M7/00

CPC分类号： H03M7/40 ,  H04N19/13 ,  H04N19/436 ,  H04N19/44 ,  H04N19/46 ,  H04N19/61

摘要： A method for entropy coding data using parallel entropy coders to encode an input sequence as a plurality of encoded subsequences, which are then combined to form an output bitstream. The input sequence is separated into subsequences on the basis of a context model. A method for entropy decoding a bitstream of encoded data by extracting a plurality of encoded subsequences from the bitstream and entropy decoding the encoded subsequences in parallel to generate a plurality of decoded subsequences, which are then interleaved based on a context model to produce a reconstructed sequence.

摘要翻译： 一种用于使用并行熵编码器熵编码数据以将输入序列编码为多个编码子序列的方法，其然后被组合以形成输出比特流。 基于上下文模型将输入序列分成子序列。 一种用于通过从比特流中提取多个编码子序列来熵解码编码数据的比特流的方法，并行地对编码的子序列进行熵解码以产生多个经解码的子序列，然后基于上下文模型进行交织以产生重构序列 。

公开(公告)号：US20110170608A1

公开(公告)日：2011-07-14

申请号：US12684247

申请日：2010-01-08

申请人： Xun Shi ,  Xiang Yu ,  Dake He

发明人： Xun Shi ,  Xiang Yu ,  Dake He

IPC分类号： H04N7/26

CPC分类号： H04N19/109 ,  H04N19/147 ,  H04N19/40 ,  H04N19/59 ,  H04N19/61 ,  H04N19/96

摘要： An encoder for encoding a downsampled video in which macroblock partitioning is based upon downsampled partitioning of full-resolution macroblocks. The refinement of the downsampled partitioning involves storing the downsampled partitioning in a quad-tree data structure and recursively identifying and evaluating possible mergers of leaf nodes having a common parent node. Using rate-distortion analysis possible mergers are evaluated and advantageous mergers are performed, thereby creating larger partitions and new leaf nodes. The traversing of the quad-tree to identify possible leaf node mergers is stopped when no further possible mergers may be identified that would result in a rate-distortion advantage.

摘要翻译： 用于编码下采样视频的编码器，其中宏分区基于全分辨率宏块的下采样分区。 下采样分区的细化涉及将下采样分区存储在四叉树数据结构中，并递归地识别和评估具有公共父节点的叶节点的可能合并。 使用速率失真分析来评估可能的合并，并执行有利的合并，从而创建更大的分区和新的叶节点。 当不能识别可能导致速率失真优势的可能的合并时，停止遍历四叉树以识别可能的叶节点合并。

公开(公告)号：US20110170598A1

公开(公告)日：2011-07-14

申请号：US12684461

申请日：2010-01-08

申请人： Xun Shi ,  Xiang Yu ,  Dake He ,  En-Hui Yang

发明人： Xun Shi ,  Xiang Yu ,  Dake He ,  En-Hui Yang

IPC分类号： H04N7/26

CPC分类号： H04N19/109 ,  H04N19/147 ,  H04N19/176 ,  H04N19/52 ,  H04N19/61

摘要： An encoder for encoding a video by performing motion estimation using predicted residuals in the rate-distortion cost expression. The predicted residuals are determined by finding a predicted motion vector with respect to the original reference frame and calculating the corresponding residual values. The actual motion vector is then selected based on minimization of the rate-distortion cost expression with respect to the reconstructed reference frame, where the rate-distortion cost expression includes the predicted residuals. In particular, the cost expression includes reconstructed predicted residuals within the distortion term.

摘要翻译： 一种用于通过使用速率失真成本表达式中的预测残差执行运动估计来对视频进行编码的编码器。 通过找到关于原始参考帧的预测运动矢量并计算相应的残差来确定预测残差。 然后基于相对于重构的参考帧的速率失真成本表达式的最小化来选择实际运动矢量，其中速率失真成本表达式包括预测的残差。 特别地，成本表达式包括在失真项内的重建的预测残差。