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公开(公告)号:US06519288B1
公开(公告)日:2003-02-11
申请号:US09035969
申请日:1998-03-06
申请人: Anthony Vetro , Huifang Sun , Tommy Poon
发明人: Anthony Vetro , Huifang Sun , Tommy Poon
IPC分类号: H04N0718
CPC分类号: H04N19/59
摘要: The apparatus for decoding a digital signal includes a composite picture forming unit for forming a composite picture from a first digital video signal and a second digital video signal. The first digital video signal includes inter-coded picture data. A down-converter receives a third digital video signal, and outputs the third digital video signal to the composite picture forming unit as the first digital signal in a first mode. However, the down-converter down-converts the third digital video signal into a fourth digital video signal in a second mode, and outputs the fourth digital video signal to the composite picture forming unit in the second mode. A memory stores the anchor pictures output from the composite picture forming unit, and a motion compensator generates the second digital signal based on the stored anchor pictures.
摘要翻译: 用于对数字信号进行解码的装置包括用于从第一数字视频信号和第二数字视频信号形成合成图像的合成图像形成单元。 第一数字视频信号包括帧间编码图像数据。 下变频器接收第三数字视频信号,并以第一模式将第三数字视频信号作为第一数字信号输出到合成图像形成单元。 然而,下变频器在第二模式中将第三数字视频信号下变频为第四数字视频信号,并在第二模式中将第四数字视频信号输出到复合图像形成单元。 存储器存储从复合图像形成单元输出的锚图像,并且运动补偿器基于存储的锚图像生成第二数字信号。
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公开(公告)号:US06493386B1
公开(公告)日:2002-12-10
申请号:US09504323
申请日:2000-02-14
申请人: Anthony Vetro , Huifang Sun , Yao Wang
发明人: Anthony Vetro , Huifang Sun , Yao Wang
IPC分类号: H04N726
CPC分类号: H04L65/605 , G06T9/20 , H04L29/06 , H04L29/06027 , H04L47/10 , H04L65/80 , H04L67/2819 , H04L67/2823 , H04L69/04 , H04L69/329 , H04N19/124 , H04N19/147 , H04N19/152 , H04N19/172 , H04N19/19 , H04N19/20 , H04N19/25 , H04N19/29 , H04N19/33 , H04N19/40 , H04N19/436 , H04N19/61 , H04N21/84
摘要: A compressed bitstream is scaled down to a reduced rate bitstream by first demultiplexing a compressed input bitstream to extract video objects as elementary input bitstreams having a first bit rate. A transcoder converts each elementary input bitstream to an elementary output bitstream having a second bit rate. The first bit rate is less than the second bit rate. A transcoding control unit, coupled to the transcoder, supplies control information for the transcoder. A multiplexer composes the elementary output bitstreams into a compressed output bitstream having the second bit rate.
摘要翻译: 通过首先对压缩的输入比特流进行解复用以将视频对象提取为具有第一比特率的基本输入比特流,将经压缩的比特流缩小到降低的比特流。 代码转换器将每个基本输入比特流转换为具有第二比特率的基本输出比特流。 第一个比特率小于第二个比特率。 耦合到代码转换器的代码转换控制单元提供代码转换器的控制信息。 多路复用器将基本输出比特流组合成具有第二比特率的压缩输出比特流。
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公开(公告)号:US06490320B1
公开(公告)日:2002-12-03
申请号:US09546717
申请日:2000-04-11
申请人: Anthony Vetro , Ajay Divakaran , Huifang Sun
发明人: Anthony Vetro , Ajay Divakaran , Huifang Sun
IPC分类号: H04B166
CPC分类号: H04N21/23418 , H04L29/06 , H04L29/06027 , H04L47/10 , H04L65/605 , H04L65/80 , H04L67/2819 , H04L67/2823 , H04L69/04 , H04L69/329 , H04N19/124 , H04N19/126 , H04N19/132 , H04N19/147 , H04N19/152 , H04N19/164 , H04N19/17 , H04N19/172 , H04N19/179 , H04N19/19 , H04N19/20 , H04N19/25 , H04N19/29 , H04N19/33 , H04N19/40 , H04N19/436 , H04N19/587 , H04N19/61 , H04N21/2343 , H04N21/234318 , H04N21/2402 , H04N21/25825 , H04N21/25833 , H04N21/2662 , H04N21/84
摘要: In an apparatus for transcoding a compressed video, a generator simulates constraints of a network and constraints of a user device. A classifier is coupled to receive an input compressed video and the constraints. The classifier generates content information from features of the input compressed video. A manager produces a plurality of conversions modes dependent the constraints and content information, and a transcoder produces output compressed videos, one for each of the plurality conversion modes.
摘要翻译: 在用于对压缩视频进行代码转换的设备中,发生器模拟网络的约束和用户设备的约束。 分类器被耦合以接收输入压缩视频和约束。 分类器从输入压缩视频的特征生成内容信息。 管理器产生依赖于约束和内容信息的多个转换模式,并且代码转换器产生输出压缩视频,对于多个转换模式中的每一个都是一个。
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公开(公告)号:US06327390B1
公开(公告)日:2001-12-04
申请号:US09231699
申请日:1999-01-14
申请人: Huifang Sun , Ajay Divakaran , Hiroshi Ito , Tommy C. Poon
发明人: Huifang Sun , Ajay Divakaran , Hiroshi Ito , Tommy C. Poon
IPC分类号: G06K946
CPC分类号: H04N5/147 , H04N19/142 , H04N19/179 , H04N19/87
摘要: A method locates scene changes in a sequence of images or frames that have been compressed without first decompressing the sequence. The sequence includes subsequences of P-frames between I-frames. DC residual coefficients including sign information are extracted from the sub-sequences of P-frames. If the number of residual coefficients in the P-frames exceed a predetermined threshold, then a scene change is indicated. Positive coefficients indicate fade-ins, and negative coefficients indicate fade-outs.
摘要翻译: 一种方法可以在没有首先解压缩序列的情况下,对压缩的图像或帧序列中的场景变化进行定位。 该序列包括I帧之间的P帧的子序列。 从P帧的子序列中提取包括符号信息的DC残差系数。 如果P帧中的残差系数超过预定阈值,则指示场景变化。 正系数表示淡入淡出,负系数表示淡入淡出。
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公开(公告)号:US06192080B1
公开(公告)日:2001-02-20
申请号:US09206032
申请日:1998-12-04
申请人: Huifang Sun , Anthony Vetro , Yen-Kuang Chen , Sun-Yuan Kung
发明人: Huifang Sun , Anthony Vetro , Yen-Kuang Chen , Sun-Yuan Kung
IPC分类号: H04N712
CPC分类号: H04N19/577
摘要: A method determines true motion vectors associated with a sequence of images. The images include fields made up of blocks of pixels. The method selects candidate feature blocks from the blocks of pixels. The candidate feature blocks have intensity variances above a threshold indicative of texture features. Candidate feature blocks in similarly numbered adjacent field intervals are compared to determine sets of displaced frame differences parameters for each candidate feature block. The true motion vectors for each candidate feature block are determined from a minimum weighted score derived from the difference parameters.
摘要翻译: 一种方法确定与图像序列相关联的真实运动矢量。 图像包括由像素块组成的场。 该方法从像素块中选择候选特征块。 候选特征块具有高于指示纹理特征的阈值的强度方差。 将相似编号的相邻场间隔中的候选特征块进行比较,以确定每个候选特征块的位移帧差参数的集合。 每个候选特征块的真实运动矢量是从差分参数导出的最小加权得分确定的。
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公开(公告)号:US5835151A
公开(公告)日:1998-11-10
申请号:US648358
申请日:1996-05-15
申请人: Huifang Sun , Jay Bao , Tommy C. Poon
发明人: Huifang Sun , Jay Bao , Tommy C. Poon
CPC分类号: H04N7/0125 , H04N19/40 , H04N19/85
摘要: A method and apparatus for down-converting a digital video signal includes a synthesizer and a converter. The synthesizer receives a digital video signal including at least first and second DCT blocks of DCT coefficients, and synthesizes the first and second DCT blocks into a single synthesized DCT block having dimensions equal to the first and second DCT blocks. The converter converts the synthesized DCT block from the DCT domain to the spatial domain to produce an output digital video signal.
摘要翻译: 用于下变频数字视频信号的方法和装置包括合成器和转换器。 合成器接收包括DCT系数的至少第一和第二DCT块的数字视频信号,并将第一和第二DCT块合成为具有等于第一和第二DCT块的尺寸的单个合成DCT块。 转换器将合成DCT块从DCT域转换为空间域,以产生输出数字视频信号。
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87.
公开(公告)号:US5455629A
公开(公告)日:1995-10-03
申请号:US17455
申请日:1993-02-12
申请人: Huifang Sun , Joel W. Zdepski
发明人: Huifang Sun , Joel W. Zdepski
IPC分类号: H04N5/44 , H04N7/24 , H04N7/54 , H04N7/60 , H04N19/895 , H04N21/438 , H04N21/442 , H04N7/12
CPC分类号: H04N21/4382 , H04N19/152 , H04N19/174 , H04N19/30 , H04N19/37 , H04N19/423 , H04N19/577 , H04N19/61 , H04N19/895 , H04N21/44209 , H04N5/4401 , H04N7/54 , H04N19/50 , H04N19/70
摘要: A digital video signal processing system includes apparatus for concealing errors which might occur in reproduced images due to image data lost during signal transmission. The system includes circuitry for detecting transmitted video data, generating error signals if errors are present in segments (transport blocks) of the received data, and excising segments having errors from the data stream. The received data is applied to a decoder/decompressor system which decodes and decompresses the transmitted video data according to a predetermined sequence and applies the decompressed video data to a memory (for subsequent display or recording, etc.). The decompressor is responsive to the error signals for altering the predetermined sequence.
摘要翻译: 数字视频信号处理系统包括用于在信号传输期间由于图像数据丢失而隐藏在再现图像中可能发生的错误的装置。 该系统包括用于检测传输的视频数据的电路,如果在接收到的数据的段(传输块)中存在错误,则产生误差信号,以及从数据流切除具有错误的段。 所接收的数据被应用于解码器/解压缩器系统,该解码器/解压缩器系统根据预定的顺序解码和解压缩传输的视频数据,并将解压缩的视频数据应用于存储器(用于随后的显示或记录等)。 解压缩器响应于错误信号来改变预定的顺序。
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