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    System for detecting redundant images in a video sequence by comparing two predetermined threshold values
    2.
    发明授权
    System for detecting redundant images in a video sequence by comparing two predetermined threshold values 失效
    用于通过比较两个预定阈值来检测视频序列中的冗余图像的系统

    公开(公告)号：US06298090B1

    公开(公告)日：2001-10-02

    申请号：US09090594

    申请日：1998-06-04

    申请人： Kiran Challapali ,  Yingwei Chen

    发明人： Kiran Challapali ,  Yingwei Chen

    IPC分类号： H04N718

    CPC分类号： H04N19/587 ,  H04N19/132

    摘要： A system for detecting redundant images in a video sequence includes dividing a target image in the video sequence into a plurality of regions, and determining, for each of the plurality of regions, a local value comprising a sum of differences between individual pixels of each region and corresponding pixels in at least one other image in the video sequence. The local value for each of the plurality of regions is then compared to a first predetermined threshold. The system also includes determining a global value comprising a sum of differences between substantially all pixels in the target image and corresponding pixels in the at least one other image, and comparing the global value to a second predetermined threshold. An indication that the target image is redundant is then output in a case that the local value does not exceed the first predetermined threshold for all regions, and the global value does not exceed the second predetermined threshold.

    摘要翻译： 一种用于检测视频序列中的冗余图像的系统，包括将视频序列中的目标图像划分为多个区域，并且针对多个区域中的每一个确定包括每个区域的各个像素之间的差异之和的局部值 以及视频序列中的至少一个其他图像中的对应像素。 然后将多个区域中的每一个的局部值与第一预定阈值进行比较。 该系统还包括确定包括目标图像中的基本上所有像素与至少一个其它图像中的相应像素之间的差的总和，并将全局值与第二预定阈值进行比较的全局值。 然后在本地值不超过所有区域的第一预定阈值并且全局值不超过第二预定阈值的情况下输出目标图像是冗余的指示。

    Method of chroma-keying for a digital video compression system
    3.
    发明授权
    Method of chroma-keying for a digital video compression system 失效
    数字视频压缩系统色度键控方法

    公开(公告)号：US6084982A

    公开(公告)日：2000-07-04

    申请号：US992291

    申请日：1997-12-17

    申请人： Kiran Challapali ,  Yingwei Chen

    发明人： Kiran Challapali ,  Yingwei Chen

    IPC分类号： H04N9/75 ,  H04N7/26 ,  H04N11/04

    CPC分类号： H04N9/75 ,  H04N19/124 ,  H04N19/14 ,  H04N19/152 ,  H04N19/176 ,  H04N19/186 ,  H04N19/20

    摘要： A method of performing chroma-key coding including the steps of defining color regions and quantifying the number of pixels in the regions, classifying macroblocks in accordance with the number of pixels thus quantified, assigning chroma complexity weights for use in the computation of quantization step-size based on the classification of the macroblocks, computing the quantization step-size, performing quantization and performing variable length coding.

    摘要翻译： 一种执行色键编码的方法，包括定义颜色区域和量化该区域中的像素数量的步骤，根据如此量化的像素数量对宏块进行分类，分配用于计算量化步长的色度复杂度权重， 基于宏块的分类，计算量化步长，执行量化和执行可变长度编码。

    Method and apparatus for decoding digital video using parallel processing
    4.
    发明授权
    Method and apparatus for decoding digital video using parallel processing 失效
    使用并行处理对数字视频进行解码的方法和装置

    公开(公告)号：US5532744A

    公开(公告)日：1996-07-02

    申请号：US294124

    申请日：1994-08-22

    申请人： Olu Akiwumi-Assani ,  Carlo Basile ,  Alan Cavallerano ,  Kiran Challapali ,  Richard Shen ,  Karl Wittig

    发明人： Olu Akiwumi-Assani ,  Carlo Basile ,  Alan Cavallerano ,  Kiran Challapali ,  Richard Shen ,  Karl Wittig

    IPC分类号： H04N7/26 ,  H04N7/50

    CPC分类号： H04N19/436 ,  H04N19/61 ,  H04N19/30

    摘要： A method and decoder for decoding a hierarchically coded digital video bitstream which can process a high resolution television picture in real time and which is made, up of a number of individual decoder modules, connected in parallel, which each have less real time processing power than is necessary, but which when combined, have at least the necessary processing power needed to process the bitstream in real time. The decoder includes a system controller which detects the hierarchical code indicating bits and slices and communicates this information to a slice parser which dynamically allocates the bitstream among the digital modules as needed on a per slice basis.

    摘要翻译： 一种分层编码的数字视频比特流的解码方法和解码器，其可以实时处理高分辨率电视图像，并且由并行连接的多个单独的解码器模块构成，每个解码器模块的实时处理能力都比 是必要的，但是当组合时，至少具有实时处理比特流所需的必要处理能力。 解码器包括系统控制器，其检测指示比特和片段的分层代码，并将该信息传送到片分析器，根据需要在每个片基的基础上动态地分配数字模块中的比特流。

    Method of frame-by-frame calculation of quantization matrices
    6.
    发明授权
    Method of frame-by-frame calculation of quantization matrices 失效
    量化矩阵逐帧计算的方法

    公开(公告)号：US6067118A

    公开(公告)日：2000-05-23

    申请号：US991521

    申请日：1997-12-16

    申请人： Yingwei Chen ,  Kiran Challapali

    发明人： Yingwei Chen ,  Kiran Challapali

    IPC分类号： G06T9/00 ,  H04N7/26 ,  H04N7/30

    CPC分类号： H04N19/126 ,  H04N19/60 ,  H04N19/124

    摘要： A method of reducing distortion in a video signal by coding a video frame utilizing a quantization matrix specifically determined for the video frame. The method includes the steps of determining the degree to which the video signal is spread about an average value, determining an average quantizer scale-value Q for the video frame, determining a reference weighted distortion for all DCT frequency bands in the video frame, determining the quantization parameter through a normalized distortion function, determining each weight for each DCT frequency band and coding the video frame taking into account the determined weights in the quantization matrix.

    摘要翻译： 一种通过使用专门为视频帧确定的量化矩阵对视频帧进行编码来减少视频信号中的失真的方法。 该方法包括以下步骤：确定视频信号关于平均值的扩展程度，确定视频帧的平均量化器比例值Q，确定视频帧中所有DCT频带的参考加权失真，确定 通过归一化失真函数的量化参数，确定每个DCT频带的每个权重，并且考虑到量化矩阵中确定的权重对视频帧进行编码。

    MAC protocol for multi-channel wireless networks
    7.
    发明授权
    MAC protocol for multi-channel wireless networks 有权
    用于多通道无线网络的MAC协议

    公开(公告)号：US09025578B2

    公开(公告)日：2015-05-05

    申请号：US12937025

    申请日：2009-04-24

    申请人： Carlos Cordeiro ,  Bong-Jun Ko ,  Kiran Challapali

    发明人： Carlos Cordeiro ,  Bong-Jun Ko ,  Kiran Challapali

    IPC分类号： H04J3/00 ,  H04W48/10 ,  H04W88/18

    CPC分类号： H04W48/10 ,  H04W88/182

    摘要： A distributed coordination of a wireless network operating on different channels is provided by dispatching a device on each ‘home’ channel to regularly visit other ‘foreign’ channels to propagate and listen to broadcast information on these channels. The information in the broadcast packets transmitted on the home channel is relayed to the devices on the foreign channels by the dispatched device, as a ‘proxy device’ that operates on behalf of the other devices in the home channel. In a preferred embodiment, various aspects of this proxy process are optimized to reduce overhead and delays. Each channel is configured to distinguish home devices from foreign devices, to avoid contention between home and foreign devices. Acquired beacon slots on foreign channels are reserved to facilitate returning proxy devices. At the home channel, an anchor device alerts other devices of the proxy device's temporary absence and preserves the proxy device's beacon slot on the home channel.

    摘要翻译： 通过在每个“家庭”频道上发送设备来定期访问其他“外部”频道来传播和收听这些频道上的广播信息，来提供在不同频道上操作的无线网络的分布式协调。 在归属信道上发送的广播分组中的信息被分配的设备中继到外部信道上的设备，作为代表家庭信道中的其他设备操作的“代理设备”。 在优选实施例中，优化该代理过程的各个方面以减少开销和延迟。 每个通道被配置为将家用设备与外部设备区分开，以避免家庭和外部设备之间的争用。 保留在外国频道上获取的信标插槽，以方便退回代理设备。 在家庭通道，锚设备向其他设备通知代理设备暂时不存在，并在家庭通道上保留代理设备的信标时隙。

    MAC PROTOCOL FOR MULTI-CHANNEL WIRELESS NETWORKS
    8.
    发明申请
    MAC PROTOCOL FOR MULTI-CHANNEL WIRELESS NETWORKS 有权
    用于多通道无线网络的MAC协议

    公开(公告)号：US20110032912A1

    公开(公告)日：2011-02-10

    申请号：US12937025

    申请日：2009-04-24

    申请人： Carlos Cordeiro ,  Bong-Jun Ko ,  Kiran Challapali

    发明人： Carlos Cordeiro ,  Bong-Jun Ko ,  Kiran Challapali

    IPC分类号： H04W48/02 ,  H04W72/04

    CPC分类号： H04W48/10 ,  H04W88/182

    摘要： A distributed coordination of a wireless network operating on different channels is provided by dispatching a device on each ‘home’ channel to regularly visit other ‘foreign’ channels to propagate and listen to broadcast information on these channels. The information in the broadcast packets transmitted on the home channel is relayed to the devices on the foreign channels by the dispatched device, as a ‘proxy device’ that operates on behalf of the other devices in the home channel. In a preferred embodiment, various aspects of this proxy process are optimized to reduce overhead and delays. Each channel is configured to distinguish home devices from foreign devices, to avoid contention between home and foreign devices. Acquired beacon slots on foreign channels are reserved to facilitate returning proxy devices. At the home channel, an anchor device alerts other devices of the proxy device's temporary absence and preserves the proxy device's beacon slot on the home channel.

    摘要翻译： 通过在每个“家庭”频道上发送设备来定期访问其他“外部”频道来传播和收听这些频道上的广播信息，来提供在不同频道上操作的无线网络的分布式协调。 在归属信道上发送的广播分组中的信息被分配的设备中继到外部信道上的设备，作为代表家庭信道中的其他设备操作的“代理设备”。 在优选实施例中，优化该代理过程的各个方面以减少开销和延迟。 每个通道被配置为将家用设备与外部设备区分开，以避免家庭和外部设备之间的争用。 保留在外国频道上获取的信标插槽，以方便退回代理设备。 在家庭通道，锚设备向其他设备通知代理设备暂时不存在，并在家庭通道上保留代理设备的信标时隙。