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81. 发明申请

US20100158120A1 Reference Picture Selection for Sub-Pixel Motion Estimation 有权
标题翻译：子像素运动估计的参考图像选择
公开(公告)号：US20100158120A1
公开(公告)日：2010-06-24
申请号：US12342223
申请日：2008-12-23
申请人： Xue Fang , Ajay Luthra , Limin Wang
发明人： Xue Fang , Ajay Luthra , Limin Wang
IPC分类号： H04N11/02
CPC分类号： H04N19/573 , H04N19/105 , H04N19/147 , H04N19/172 , H04N19/196 , H04N19/46 , H04N19/463 , H04N19/52 , H04N19/523
摘要： A video coding system includes a prediction module configured to perform multi-reference picture sub-pixel motion estimation. Reference pictures are selected for the sub-pixel motion estimation based on full-pixel motion estimation. A cost function is used to select the reference pictures from one or more groups of reference pictures for a block in a macroblock. The cost is based on full-pixel motion estimation errors and a predicted motion vector for the block. The selected reference pictures are used for sub-pixel motion estimation to get the final motion vector for each block.
摘要翻译：视频编码系统包括被配置为执行多参考图像子像素运动估计的预测模块。基于全像素运动估计选择参考图像用于子像素运动估计。使用成本函数来从宏块中的块的一个或多个参考图片组中选择参考图片。成本基于全像素运动估计误差和块的预测运动矢量。选择的参考图像用于子像素运动估计，以获得每个块的最终运动矢量。

82. 发明授权

US06434197B1 Multi-functional transcoder for compressed bit streams 有权
标题翻译：用于压缩比特流的多功能代码转换器
公开(公告)号：US06434197B1
公开(公告)日：2002-08-13
申请号：US09226796
申请日：1999-01-07
申请人： Limin Wang , Ajay Luthra
发明人： Limin Wang , Ajay Luthra
IPC分类号： H04N718
CPC分类号： H04N21/23655 , H04N19/117 , H04N19/162 , H04N19/172 , H04N19/40 , H04N19/80 , H04N19/86
摘要： A method and apparatus for transcoding digital video data, for example, at the headend of a cable or satellite television network. A generic multi-functional transcoder architecture has a “post-pre-processing engine” that provides a number of processing functions for implementing desired format conversions according to a user selection signal or an automatically generated selection signal. The processing functions can change frame size, frame rate, color space sampling format, interlaced or progressive scan format, resolution, and provide noise/deblocking filtering, for example. The system also allows the control of several transcoders to convert several bit streams with different formats into corresponding bit streams with a common format. Furthermore, the transcoder avoids the need for motion estimation.
摘要翻译：一种用于例如在有线或卫星电视网络的前端对数字视频数据进行代码转换的方法和装置。通用多功能代码转换器架构具有“后预处理引擎”，其提供用于根据用户选择信号或自动生成的选择信号来实现所需格式转换的多个处理功能。处理功能可以改变帧大小，帧速率，色彩空间采样格式，隔行或逐行扫描格式，分辨率，并提供噪声/去块滤波。该系统还允许控制多个代码转换器，将具有不同格式的多个比特流以通用格式转换成相应的比特流。此外，代码转换器避免了对运动估计的需要。

83. 发明授权

US06441754B1 Apparatus and methods for transcoder-based adaptive quantization 有权
标题翻译：用于基于代码转换器的自适应量化的装置和方法
公开(公告)号：US06441754B1
公开(公告)日：2002-08-27
申请号：US09642925
申请日：2000-08-17
申请人： Limin Wang , Ajay Luthra , Paul Moroney
发明人： Limin Wang , Ajay Luthra , Paul Moroney
IPC分类号： H03M700
CPC分类号： H04N19/162 , H04N5/4401 , H04N5/76 , H04N5/781 , H04N5/782 , H04N9/7921 , H04N9/8042 , H04N19/40 , H04N19/51 , H04N19/90 , H04N21/4147 , H04N21/4334 , H04N21/4351 , H04N21/440254 , H04N21/4622 , H04N21/47 , H04N21/8545
摘要： The present invention provides a transcoding architecture and a consumer set-top box with storage capability that is based on the transcoding architecture and capable of operating efficiently in an all-digital environment. In a preferred embodiment, a digital-VIDEO DEVICE employs an MPEG-2 compliant transcoder that includes a simplified cascaded decoder and encoder, and is capable of performing determinable bitrate re-encoding without conducting motion estimation. During recording, the decoder receives and processes a compressed source bitstream, producing a decoded bitstream that includes reconstructed video and preserved motion vectors. The encoder “re-encodes” the decoded bitstream using the preserved motion vectors and performs any applicable bitrate modifications. The re-encoded bitstream is then stored.
摘要翻译：本发明提供一种具有存储能力的代码转换架构和消费者机顶盒，其基于代码转换架构并且能够在全数字环境中有效地运行。在优选实施例中，数字视频设备采用符合MPEG-2的代码转换器，其包括简化的级联解码器和编码器，并且能够执行可确定的比特率重新编码而不进行运动估计。在记录期间，解码器接收并处理压缩源比特流，产生包括重构的视频和保存的运动矢量的解码比特流。编码器使用保留的运动矢量对解码的比特流进行“重新编码”，并执行任何适用的比特率修改。然后存储重新编码的比特流。

84. 发明授权

US07020198B2 Rate control for an MPEG transcoder without a priori knowledge picture type 有权
公开(公告)号：US07020198B2
公开(公告)日：2006-03-28
申请号：US10131414
申请日：2002-04-22
申请人： Limin Wang , Ajay Luthra , Robert O. Eifrig
发明人： Limin Wang , Ajay Luthra , Robert O. Eifrig
IPC分类号： H04N7/12 , H04N11/04 , H04N11/02
CPC分类号： H04N21/23655 , H04N19/114 , H04N19/152 , H04N19/157 , H04N19/159 , H04N19/172 , H04N19/177 , H04N19/40 , H04N19/577 , H04N19/61
摘要： A rate control system suitable for use with a digital video transcoder, such as one conforming to the MPEG standard. The proposed rate control system starts coding with any reasonable set of assumed Group of Pictures (GOP) parameters, thereby avoiding a processing delay of about one GOP which would otherwise be incurred to extract the complete GOP structure information from a pre-compressed bit stream. In addition, the system avoids the need to store the data corresponding to the GOP, thereby reducing the memory required for transcoding. Encoding of a first picture in a sequence or GOP begins without a priori knowledge of the picture type of subsequent pictures. A reasonable set of GOP parameters is assumed to determine an encoding bit budget. The bit budget is gradually corrected as successive pictures are coded according to their picture types. Changes in the GOP structure of pre-compressed bitstreams can be addressed, for example, when switching channels, inserting commercials, and the like. Target rates with incorrect starting GOP parameters will converge within a few GOPs.

85. 发明授权

US06570922B1 Rate control for an MPEG transcoder without a priori knowledge of picture type 有权
标题翻译：没有图像类型的先验知识的MPEG代码转换器的速率控制
公开(公告)号：US06570922B1
公开(公告)日：2003-05-27
申请号：US09198867
申请日：1998-11-24
申请人： Limin Wang , Ajay Luthra , Robert O. Eifrig
发明人： Limin Wang , Ajay Luthra , Robert O. Eifrig
IPC分类号： H04N712
CPC分类号： H04N21/23655 , H04N19/114 , H04N19/152 , H04N19/157 , H04N19/159 , H04N19/172 , H04N19/177 , H04N19/40 , H04N19/577 , H04N19/61
摘要： A rate control system suitable for use with a digital video transcoder, such as one conforming to the MPEG standard. The proposed rate control system starts coding with any reasonable set of assumed Group of Pictures (GOP) parameters, thereby avoiding a processing delay of about one GOP which would otherwise be incurred to extract the complete GOP structure information from a pre-compressed bit stream. In addition, the system avoids the need to store the data corresponding to the GOP, thereby reducing the memory required for transcoding. Encoding of a first picture in a sequence or GOP begins without a priori knowledge of the picture type of subsequent pictures. A reasonable set of GOP parameters is assumed to determine an encoding bit budget. The bit budget is gradually corrected as successive pictures are coded according to their picture types. Changes in the GOP structure of pre-compressed bitstreams can be addressed, for example, when switching channels, inserting commercials, and the like. Target rates with incorrect starting GOP parameters will converge within a few GOPs.
摘要翻译：一种适用于数字视频转码器的速率控制系统，例如符合MPEG标准的数字视频转码器。所提出的速率控制系统以任何合理的假想图像组（GOP）参数开始编码，从而避免了大约一个GOP的处理延迟，否则将从预压缩位流中提取完整的GOP结构信息。此外，系统避免了存储对应于GOP的数据的需要，从而减少了转码所需的存储器。序列或GOP中的第一图像的编码开始于对随后图像的图像类型的先验知识。假设合理的GOP参数集合来确定编码比特预算。随着连续的图像根据图像的类型被编码，位预算逐渐被校正。可以解决预压缩比特流的GOP结构的变化，例如，当切换频道，插入商业广告等时。具有不正确起始GOP参数的目标速率将在几个GOP内收敛。

86. 发明授权

US06259741B1 Method of architecture for converting MPEG-2 4:2:2-profile bitstreams into main-profile bitstreams 有权
标题翻译：将MPEG-2 4：2：2配置比特流转换为主配置文件位流的架构方法
公开(公告)号：US06259741B1
公开(公告)日：2001-07-10
申请号：US09252135
申请日：1999-02-18
申请人： Xuemin Chen , Limin Wang , Ajay Luthra , Robert O. Eifrig
发明人： Xuemin Chen , Limin Wang , Ajay Luthra , Robert O. Eifrig
IPC分类号： H04N712
CPC分类号： H04N19/186 , H04N19/40
摘要： A system for converting the color format of a digital video bitstream. The system accounts for the allowable formats of the pre- and-post-conversion bitstreams, including quantizer precision level, and whether luma and chroma data have separate quantization matrices, or share a common quantization matrix. In a particular implementation, an MPEG-2 4:2:2 P bitstream having a color format of 4:2:2 or 4:2:0 is converted to a MP bitstream having a color format of 4:2:0. Coding efficiencies are achieved by using the luma quantization matrix to re-quantize the chroma data, and re-using luma motion vectors for performing motion compensation of the chroma data. Further efficiencies can be achieved by representing a 4:2:2 reference picture in a 4:2:0 format for converting inter coded frames, and changing the position of a pixel downsizing filter and clip function. Adjustment of the quantization precision is provided as required. A transcoding function can also be achieved.
摘要翻译：一种用于转换数字视频比特流的颜色格式的系统。系统考虑了前后转换比特流的允许格式，包括量化器精度级别，以及亮度和色度数据是否具有单独的量化矩阵，或共享公共量化矩阵。在具体实现中，将具有4:2:2或4:2:0的颜色格式的MPEG-2 4：2：2比特流转换为具有4:2:0的颜色格式的MP比特流。通过使用亮度量化矩阵来重新量化色度数据并且重新使用亮度运动矢量来执行色度数据的运动补偿来实现编码效率。通过以4：2：0格式表示4：2：2参考图像来转换帧间编码帧，并改变像素缩小滤波器和剪辑功能的位置，可以实现更高的效率。根据需要提供量化精度的调整。还可以实现转码功能。

87. 发明申请

US20090161697A1 Method and System for Interleaving Video and Data for Transmission over a Network at a Selected Bit Rate 有权
标题翻译：用于以所选位速率在网络上传输视频和数据的方法和系统
公开(公告)号：US20090161697A1
公开(公告)日：2009-06-25
申请号：US11960446
申请日：2007-12-19
申请人： Limin Wang , Xue Fang , Vivian Kung , Ajay Luthra , Yinqing Zhao , Jian Zhou
发明人： Limin Wang , Xue Fang , Vivian Kung , Ajay Luthra , Yinqing Zhao , Jian Zhou
IPC分类号： H04J3/22
CPC分类号： H04N21/4347 , H04N19/40 , H04N21/234354 , H04N21/2365 , H04N21/23655 , H04N21/2383 , H04N21/2385
摘要： A StatMux system and method are provided for efficiently allocating time slots on the transmission channel between bit streams representing video and bit streams representing data. By providing such a system and method, when a decreased number of data bits need to be transmitted, a decreased number of time slots may be allocated for transmitting the data bits and an increased number of time slots may be allocated for transmitting video bits. When a decreased number of video bits needs to be transmitted, a decreased number of time slots may be allocated for transmitting video bits and an increased number of time slots may be allocated for transmitting data bits.
摘要翻译：提供了一种StatMux系统和方法，用于在表示视频的比特流和表示数据的比特流之间有效地分配传输信道上的时隙。通过提供这样的系统和方法，当需要发送数据比特数减少时，可以分配减少数量的时隙用于发送数据比特，并且可以分配更多数量的时隙用于发送视频比特。当需要发送减少数量的视频位时，可以分配减少数量的时隙用于发送视频比特，并且可以分配增加数量的时隙用于发送数据比特。

88. 发明授权

US06434195B1 Splicing of video data in progressively refreshed video streams 有权
标题翻译：逐渐刷新的视频流中的视频数据的拼接
公开(公告)号：US06434195B1
公开(公告)日：2002-08-13
申请号：US09196709
申请日：1998-11-20
申请人： Ajay Luthra , Keith J. Kelley , Limin Wang
发明人： Ajay Luthra , Keith J. Kelley , Limin Wang
IPC分类号： H04N712
CPC分类号： H04N21/812 , H04N19/00 , H04N19/107 , H04N19/157 , H04N19/172 , H04N19/174 , H04N19/40 , H04N19/48 , H04N19/61 , H04N21/23424 , H04N21/2343 , H04N21/26233 , H04N21/44016 , H04N21/8455
摘要： A method is provided for replacing compressed video from a first source with video from a second source at a predefined insertion point in a video data stream. If the video from the second source is progressively refreshed video, it is decompressed sufficiently prior to the insertion point to enable the recovery and recompression of a first video frame (in encoding order) from the second source to be inserted at the insertion point. The recovered first video frame is then recompressed as an intra-coded (I) frame. The insertion of the video from the second source is then commenced at the insertion point using the I frame. The insertion point can, for example, indicate the commencement of a commercial break in the video stream, in which case the second source provides a commercial for insertion into the commercial break. Where the commercial is stored in memory, it can be stored with the first frame thereof (in encoding order) as an I frame.
摘要翻译：提供了一种用于在视频数据流中的预定插入点处从来自第二源的视频替换来自第一源的压缩视频的方法。如果来自第二源的视频是逐渐刷新的视频，则在插入点之前对其进行充分的解压缩，以便能够从插入点插入第二个源的第一个视频帧（以编码顺序）的恢复和重新压缩。然后将恢复的第一视频帧作为帧内编码（I）帧重新压缩。然后使用I帧在插入点处开始从第二源插入视频。例如，插入点可以指示视频流中的商业中断的开始，在这种情况下，第二个源提供商业插入到商业中断。在商业存储在存储器中的情况下，可以将其第一帧（以编码顺序）存储为I帧。

89. 发明授权

US06925501B2 Multi-rate transcoder for digital streams 有权
标题翻译：用于数字流的多速率代码转换器
公开(公告)号：US06925501B2
公开(公告)日：2005-08-02
申请号：US09836006
申请日：2001-04-17
申请人： Limin Wang , Ajay Luthra
发明人： Limin Wang , Ajay Luthra
IPC分类号： H03M7/30 , H04J3/00 , H04L12/20 , H04N7/26 , H04N21/2343 , H04N21/236 , H04N21/24 , H04N21/258 , H04N21/2662 , H04N21/6373 , G06F15/16
CPC分类号： H04N21/2405 , H04N19/156 , H04N19/20 , H04N19/40 , H04N21/234354 , H04N21/23439 , H04N21/236 , H04N21/25833 , H04N21/2662 , H04N21/6373
摘要： Methods and apparatus are provided to produce a plurality of different rate output bitstreams from a common input bit stream. Overhead data is extracted from the input bit stream. The input bit stream is partially decoded. Thereafter, the at least partially decoded bit stream is re-encoded at different rates, to produce multiple re-encoded bit streams having different rates. The overhead data is combined with each re-encoded bit stream, thereby providing multiple versions of said encoded bit stream at different rates.
摘要翻译：提供方法和装置以从公共输入比特流产生多个不同速率的输出比特流。从输入比特流中提取开销数据。输入比特流被部分解码。此后，至少部分解码的比特流以不同的速率重新编码，以产生具有不同速率的多个重新编码比特流。开销数据与每个重新编码的比特流组合，从而以不同的速率提供所述编码比特流的多个版本。

90. 发明授权

US06904094B1 Processing mode selection for channels in a video multi-processor system 有权
标题翻译：视频多处理器系统中的通道的处理模式选择
公开(公告)号：US06904094B1
公开(公告)日：2005-06-07
申请号：US09665372
申请日：2000-09-20
申请人： Vincent Liu , Robert S. Nemiroff , Siu-Wai Wu , Ajay Luthra , Limin Wang
发明人： Vincent Liu , Robert S. Nemiroff , Siu-Wai Wu , Ajay Luthra , Limin Wang
IPC分类号： H04N7/26 , H04N7/50 , H04N7/12 , H04N11/02
CPC分类号： H04N19/40 , H04N19/156 , H04N19/42 , H04N19/436 , H04N19/61
摘要： An efficient processing system, such as for transcoding video data. In an embodiment that is suitable for single or multiple processor embodiments, a processing mode is set for each input video frame, e.g., as a full transcode mode, which uses motion compensation, a requantization mode, which avoids motion compensation, or a bypass mode. The processing mode selection is based on a number of processing cycles that are available to process a frame, and an expected processing requirement of the frame. The bypass or requantization modes are selected to avoid a buffer overflow of the processor.
摘要翻译：一种高效的处理系统，例如用于对视频数据进行代码转换。在适用于单个或多个处理器实施例的实施例中，为每个输入视频帧设置处理模式，例如，使用运动补偿的全代码转换模式，避免运动补偿的再量化模式或旁路模式。处理模式选择基于可用于处理帧的多个处理周期以及帧的预期处理要求。选择旁路或再量化模式以避免处理器的缓冲区溢出。

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