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1. 发明授权

US4779054A Digital inphase/quadrature product detector 失效
标题翻译：数字同相/正交产品检测器
公开(公告)号：US4779054A
公开(公告)日：1988-10-18
申请号：US85681
申请日：1987-08-17
申请人： Veronika M. Monteleone , Richard P. Perry , Bede Liu
发明人： Veronika M. Monteleone , Richard P. Perry , Bede Liu
IPC分类号： H03D1/22 , H03D1/00 , H03D3/00
CPC分类号： H03D1/2245
摘要： The detector is responsive to a modulated intermediate frequency (IF) or radio frequency (RF) signal for producing four sample signals spaced at 90.degree. one-quarter IF (or RF) cycle apart, the first and third sample signals corresponding to the amplitude of the IF signal and its negative value, respectively, the stream of such sample signals corresponding to the inphase component of the IF signal; the fourth and second sample signals corresponding to the amplitude of the IF signal and its negative value, respectively, the stream of such sample signals corresponding to the quadrature component of the IF signal.
摘要翻译：检测器响应于调制的中频（IF）或射频（RF）信号，以产生四分之一的四分之一IF（或RF）周期间隔90°的四个采样信号，第一和第三采样信号对应于 IF信号及其负值分别对应于IF信号的同相分量的这些采样信号的流; 分别对应于IF信号的幅度和其负值的第四和第二采样信号，这些采样信号的流对应于IF信号的正交分量。

2. 发明授权

US07349472B2 Rate-distortion models for error resilient video transcoding 失效
标题翻译：用于错误弹性视频转码的速率失真模型
公开(公告)号：US07349472B2
公开(公告)日：2008-03-25
申请号：US10776062
申请日：2004-02-11
申请人： Anthony Vetro , Minghui Xia , Bede Liu , Huifang Sun
发明人： Anthony Vetro , Minghui Xia , Bede Liu , Huifang Sun
IPC分类号： H04B1/66 , H04N7/12 , H04N11/02
CPC分类号： H04N19/68 , H04N19/107 , H04N19/124 , H04N19/147 , H04N19/176 , H04N19/40 , H04N19/89 , H04N19/895
摘要： A model stored in a memory accessible by a video transcoder includes a first rate-distortion function modeling a requantization of an input video. A second-rate distortion function models a resynchronization marker insertion rate for the transcoded video, and a third rate-distortion function models an intra-block insertion rate for the transcoded video.
摘要翻译：存储在由视频代码转换器访问的存储器中的模型包括对输入视频的重新量化建模的第一速率失真函数。第二速率失真函数为代码转换的视频建立再同步标记插入率，并且第三速率失真函数对代码转换的视频的块内插入速率进行建模。

3. 发明授权

US06671322B2 Video transcoder with spatial resolution reduction 有权
标题翻译：具有空间分辨率降低的视频转码器
公开(公告)号：US06671322B2
公开(公告)日：2003-12-30
申请号：US09853394
申请日：2001-05-11
申请人： Anthony Vetro , Huifang Sun , Peng Yin , Bede Liu , Tommy C. Poon
发明人： Anthony Vetro , Huifang Sun , Peng Yin , Bede Liu , Tommy C. Poon
IPC分类号： H04N712
CPC分类号： H04N19/40 , G06T3/4084 , H04N19/48 , H04N19/90
摘要： A method transcodes groups of macroblocks of a partially decoded input bitstream. The groups of macroblocks include intra-mode and inter-mode macroblocks. Each macroblock includes DCT coefficients, and at least one motion vector. The modes of each group of macroblocks are mapped to be identical only if there is an inter-mode block and an intra-mode macroblock in the group. If any of the macroblocks in the group are mapped, then the DCT coefficients and the motion vector for such mapped macroblocks are modified in accordance with the mapping to generate reduced-resolution macroblock for an output compressed bitstream to compensate for drift.
摘要翻译：一种方法对部分解码的输入比特流的宏块组进行转码。宏块组包括帧内模式和模式间宏块。每个宏块包括DCT系数和至少一个运动矢量。每组宏块的模式只有在组中有模式间模块和模式内宏块时才被映射为相同模式。如果组中的任何宏块被映射，则根据映射来修改这些映射宏块的DCT系数和运动矢量，以生成用于输出压缩比特流的减小分辨率的宏块以补偿漂移。

4. 发明申请

US20050175109A1 Optimal bit allocation for error resilient video transcoding 审中-公开
标题翻译：用于错误弹性视频转码的最佳位分配
公开(公告)号：US20050175109A1
公开(公告)日：2005-08-11
申请号：US10776571
申请日：2004-02-11
申请人： Anthony Vetro , Minghui Xia , Bede Liu , Huifang Sun
发明人： Anthony Vetro , Minghui Xia , Bede Liu , Huifang Sun
IPC分类号： H03M7/30 , H04N7/12 , H04N19/89 , H04N19/895
CPC分类号： H04N19/68 , H04N19/107 , H04N19/126 , H04N19/147 , H04N19/172 , H04N19/19 , H04N19/40 , H04N19/61 , H04N19/89 , H04N19/895
摘要： A method transcodes an input video to an output video, which can have a lower bit rate than the input video. Sets of rate values and corresponding sets of distortion values are determined for each components of the output video. There is one set of rate values and one corresponding set of distortion values for each component in the output video. The components include a requantization of the input video, inserted resynchronization markers, and inserted intra-blocks. Then, bits are allocated to each of the components in the output video according to the associated set of rate values and the associated corresponding set of distortion values.
摘要翻译：一种方法将输入视频转码为输出视频，其可以具有比输入视频更低的比特率。为输出视频的每个组件确定速率值和相应的失真值集合。输出视频中的每个组件有一组速率值和一组对应的失真值。这些组件包括输入视频的重新排序，插入的重新同步标记和插入的块内块。然后，根据相关联的一组速率值和相应的对应的失真值组，将比特分配给输出视频中的每个分量。

5. 发明授权

US07418134B2 Method and apparatus for foreground segmentation of video sequences 失效
标题翻译：视频序列前景分割的方法和装置
公开(公告)号：US07418134B2
公开(公告)日：2008-08-26
申请号：US10843953
申请日：2004-05-12
申请人： Stuart Schwartz , Juhua Zhu , Bede Liu
发明人： Stuart Schwartz , Juhua Zhu , Bede Liu
IPC分类号： G06K9/34 , G06K9/36 , H04N11/02
CPC分类号： G06K9/38 , G06T7/11 , G06T7/174 , G06T7/194 , G06T7/262 , G06T2207/10016 , G06T2207/20021 , G06T2207/20052
摘要： The present invention relates to a method and system for foreground segmentation in which frames of a video sequence are analyzed in the transform domain to determine one or more features. The features are used to model the background. The background can be modeled as a single Gaussian model with a mean and variance of the features. A current frame is segmented by determining if one or more features of the current frame analyzed in the foreground domain satisfy a threshold between the background model. The threshold value can be based on the mean and/or variance of features. During the segmentation, the mean and variance can be updated based on previous corresponding values and current features to adaptively update the background model. In one embodiment, the frames are divided into a plurality of blocks. A transform is used to analyze the blocks in the transform domain. For example, the transform can be a discrete cosine transform (DCT). The features can be a DC feature comprising the DC coefficient and an AC feature comprising a weighted sum of the AC coefficients. The weighted sum is determined with weights which are varied to emphasize different aspects of the present invention. Additional processing steps can be used to remove false positives, handle sudden global illumination changes, handle sudden local illumination changes and remove false negatives.
摘要翻译：本发明涉及一种用于前景分割的方法和系统，其中在变换域中分析视频序列的帧以确定一个或多个特征。这些功能用于建模背景。背景可以被建模为具有特征的均值和方差的单个高斯模型。通过确定在前景域中分析的当前帧的一个或多个特征是否满足背景模型之间的阈值来分割当前帧。阈值可以基于特征的平均值和/或方差。在分割期间，可以基于先前的相应值和当前特征来更新均值和方差，以自适应地更新背景模型。在一个实施例中，帧被划分成多个块。变换用于分析变换域中的块。例如，变换可以是离散余弦变换（DCT）。特征可以是包括DC系数的DC特征和包括AC系数的加权和的AC特征。用权重进行加权和确定，该权重被改变以强调本发明的不同方面。可以使用额外的处理步骤来消除假阳性，处理突然的全局照明变化，处理突发的局部照明变化并消除假阴性。

6. 发明授权

US07088780B2 Video transcoder with drift compensation 有权
标题翻译：具有漂移补偿的视频转码器
公开(公告)号：US07088780B2
公开(公告)日：2006-08-08
申请号：US09854020
申请日：2001-05-11
申请人： Anthony Vetro , Huifang Sun , Peng Yin , Bede Liu , Tommy C. Poon
发明人： Anthony Vetro , Huifang Sun , Peng Yin , Bede Liu , Tommy C. Poon
IPC分类号： H04N7/12
CPC分类号： H04N19/59 , H04N19/107 , H04N19/40 , H04N19/51 , H04N19/61
摘要： A method compensates for drift in macroblocks of a partially decoded input bitstream. The macroblocks include intra-mode and inter-mode macroblocks, and each macroblock includes DCT coefficients, and at least one motion vector. An estimate of drift is measured in the partially decoded input bitstream. The estimated drift is translated into an intra refresh rate. The modes of inter-mode macroblock are mapped to intra-mode macroblock according to the refresh rate. The DCT coefficients and the motion vector for each changed macroblock are modified in accordance with the mapping for each changed macroblock.
摘要翻译：一种补偿部分解码的输入比特流的宏块中的漂移的方法。宏块包括帧内模式和帧间模式宏块，并且每个宏块包括DCT系数和至少一个运动矢量。在部分解码的输入比特流中测量漂移的估计。估计漂移被转换成内部刷新率。模式间宏块的模式根据刷新率映射到模式内宏块。根据每个改变的宏块的映射来修改每个改变的宏块的DCT系数和运动矢量。

7. 发明授权

US5821945A Method and apparatus for video browsing based on content and structure 失效
公开(公告)号：US5821945A
公开(公告)日：1998-10-13
申请号：US856899
申请日：1997-05-15
申请人： Boon-Lock Yeo , Minerva M. Yeung , Wayne Wolf , Bede Liu
发明人： Boon-Lock Yeo , Minerva M. Yeung , Wayne Wolf , Bede Liu
IPC分类号： G06F17/30 , G06T11/00
CPC分类号： G06F17/30825 , G06F17/3084 , G06F17/30852
摘要： A new technique for extracting a hierarchical decomposition of a complex video selection for browsing purposes, combines visual and temporal information to capture the important relations within a scene and between scenes in a video, thus allowing the analysis of the underlying story structure with no a priori knowledge of the content. A general model of hierarchical scene transition graph is applied to an implementation for browsing. Video shots are first identified and a collection of key frames is used to represent each video segment. These collections are then classified according to gross visual information. A platform is built on which the video is presented as directed graphs to the user, with each category of video shots represented by a node and each edge denoting a temporal relationship between categories. The analysis and processing of video is carried out directly on the compressed videos. Preliminary tests show that the narrative structure of a video selection can be effectively captured using this technique.

8. 发明授权

US07170932B2 Video transcoder with spatial resolution reduction and drift compensation 有权
标题翻译：具有空间分辨率降低和漂移补偿的视频转码器
公开(公告)号：US07170932B2
公开(公告)日：2007-01-30
申请号：US10046366
申请日：2002-01-14
申请人： Anthony Vetro , Huifang Sun , Peng Yin , Bede Liu
发明人： Anthony Vetro , Huifang Sun , Peng Yin , Bede Liu
IPC分类号： H04B1/66
CPC分类号： G06T3/4084 , H04N19/40 , H04N19/48 , H04N19/90
摘要： A method and system reduces the spatial resolution of a compressed bitstream of a sequence of frames of a video signal by first decoding the frames, and storing the decoded frames in a first frame buffer. While performing the decoding, motion compensating is performed with full resolution motion vectors of the stored decoded frames. The decoded frames are then down-sampled to a reduced resolution, and stored in a second frame buffer. The reduced resolution frames are partially encoded to produce a reduced resolution compressed bitstream of the video. While performing the partial encoding, motion compensation is performed with reduced resolution motion vectors of the stored reduced resolution frames.
摘要翻译：一种方法和系统通过首先对帧进行解码并将解码的帧存储在第一帧缓冲器中来降低视频信号的帧序列的压缩比特流的空间分辨率。在执行解码时，利用所存储的解码帧的全分辨率运动矢量来执行运动补偿。然后将经解码的帧进行下采样以降低分辨率，并存储在第二帧缓冲器中。缩小分辨率帧被部分编码以产生视频的降低分辨率的压缩比特流。在执行部分编码的同时，利用所存储的分辨率降低的帧的分辨率降低的运动矢量执行运动补偿。

9. 发明申请

US20050175090A1 Rate-distortion models for errors resilient video transcoding 失效
标题翻译：用于错误弹性视频转码的速率失真模型
公开(公告)号：US20050175090A1
公开(公告)日：2005-08-11
申请号：US10776062
申请日：2004-02-11
申请人： Anthony Vetro , Minghui Xia , Bede Liu , Huifang Sun
发明人： Anthony Vetro , Minghui Xia , Bede Liu , Huifang Sun
IPC分类号： H04L1/00 , H04N19/89 , H04N19/895 , H04N7/12
CPC分类号： H04N19/68 , H04N19/107 , H04N19/124 , H04N19/147 , H04N19/176 , H04N19/40 , H04N19/89 , H04N19/895
摘要： A model stored in a memory accessible by a video transcoder includes a first rate-distortion function modeling a requantization of an input video. A second-rate distortion function models a resynchronization marker insertion rate for the transcoded video, and a third rate-distortion function models an intra-block insertion rate for the transcoded video.
摘要翻译：存储在由视频代码转换器访问的存储器中的模型包括对输入视频的重新量化建模的第一速率失真函数。第二速率失真函数为代码转换的视频建立再同步标记插入率，并且第三速率失真函数对代码转换的视频的块内插入速率进行建模。

10. 发明授权

US06285775B1 Watermarking scheme for image authentication 失效
标题翻译：图像认证的水印方案
公开(公告)号：US06285775B1
公开(公告)日：2001-09-04
申请号：US09164474
申请日：1998-10-01
申请人： Min Wu , Bede Liu
发明人： Min Wu , Bede Liu
IPC分类号： G06K900
CPC分类号： G06T1/0042 , G06T2201/0052
摘要： A digital watermarking process whereby an invisible watermark inserted into a host image is utilized to determine whether or not the image has been altered and, if so, where in the image such alteration occurred. The watermarking method includes the steps of providing a look-up table containing a plurality of coefficients and corresponding values; transforming the image into a plurality of blocks, wherein each block contains coefficients matching coefficients in the look-up table; and embedding the watermark in the image by performing the following substeps for at least some of the blocks: First, a coefficient is selected for insertion of a marking value representative of a corresponding portion of the watermark. Next, the value of the selected coefficient to used to identify a corresponding value in the look-up table. Finally, the identified coefficient is left unchanged if the corresponding value is the same as the marking value, and is changed if the corresponding value is different from the marking value. After the insertion of the watermark, the image may be stored in a lossy-compression form, thus permitting efficient storage and distribution. Moreover, the method may be used to produce two output signals for authentication: (1) a meaningful pattern to facilitate a quick visual check, and (2) an additional signal to detect unauthorized alteration. The method can be applied to an image compressed using JPEG or other techniques, such as Wavelet compression, and the marked image can be kept in the compressed format. Any alteration made on the marked image can be localized, making the method suitable for use in a “trustworthy” digital camera or camcorder.
摘要翻译：使用数字水印处理，由此使用插入到主机图像中的不可见水印来确定图像是否已被改变，如果是，则在图像中发生这种改变。该水印方法包括以下步骤：提供包含多个系数和对应值的查找表; 将图像变换成多个块，其中每个块包含在查找表中匹配系数的系数; 以及通过对于至少一些块执行以下子步骤来将图像嵌入图像中：首先，选择用于插入表示水印的相应部分的标记值的系数。接下来，选择的系数的值用于识别查找表中的相应值。最后，如果相应的值与标记值相同，则识别的系数保持不变，如果相应值与标记值不同，则该变化将被改变。在插入水印之后，可以以有损压缩形式存储图像，从而允许有效的存储和分发。此外，该方法可以用于产生用于认证的两个输出信号：（1）有意义的模式以便于快速视觉检查，以及（2）附加信号以检测未经授权的改变。该方法可以应用于使用JPEG或其他技术（例如小波压缩）压缩的图像，并且标记的图像可以保持为压缩格式。对标记图像进行的任何更改均可进行本地化，使该方法适用于“值得信赖”的数码相机或摄像机。

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