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    System and method for reducing power consumption for wireless communications by mobile devices
    41.
    发明授权
    System and method for reducing power consumption for wireless communications by mobile devices 有权

    公开(公告)号：US07096034B2

    公开(公告)日：2006-08-22

    申请号：US09968380

    申请日：2001-10-01

    申请人： Qian Zhang ,  Wenwu Zhu ,  Ya-Qin Zhang ,  Ji Zhu

    发明人： Qian Zhang ,  Wenwu Zhu ,  Ya-Qin Zhang ,  Ji Zhu

    IPC分类号： H04B7/00 ,  H04Q7/00

    CPC分类号： H04W52/265 ,  H04W52/146 ,  H04W52/20 ,  H04W52/24 ,  H04W52/267 ,  H04W52/54

    摘要： A power control scheme for a wireless network communication system that includes a base station and multiple wireless mobile device dynamically adjusts transmission power of a mobile device in conjunction with adjusting its bit allocation in source coding and channel coding to minimize its total power consumption while maximizing the system capacity in terms of the total effective transmission rates received by the base station. The base station sets a target signal quality value for each mobile station, and the target values are determined by the base station such that the total effective data rate from all the mobile devices is maximized under constraints of the total received power and the error protection level requirements for the mobile devices. The base station periodically measures a signal quality value, such as a signal-to-interference ratio (SIR), from transmissions received by the base from each mobile device, compares it with the measured signal quality value for that mobile device, and sends a control signal instructing the mobile device to increase or decrease its transmission power based on the result of the comparison. When the mobile device receives the control signal, it determines an amount of adjustment to its transmission power by performing a minimum calculation under constraints on the total data distortion and the maximum transmission rate to adjust the parameters for source coding, channel coding, and transmission under the constraints to result in a redistribution of power between the components that provides the minimized total power consumption.

    Video coding system and method using 3-D discrete wavelet transform and entropy coding with motion information
    42.
    发明授权
    Video coding system and method using 3-D discrete wavelet transform and entropy coding with motion information 失效
    使用3-D离散小波变换和运动信息熵编码的视频编码系统和方法

    公开(公告)号：US07023922B1

    公开(公告)日：2006-04-04

    申请号：US09599160

    申请日：2000-06-21

    申请人： Jizheng Xu ,  Shipeng Li ,  Ya-Qin Zhang

    发明人： Jizheng Xu ,  Shipeng Li ,  Ya-Qin Zhang

    IPC分类号： H04N7/12

    CPC分类号： H04N19/615 ,  H04N19/13 ,  H04N19/147 ,  H04N19/19 ,  H04N19/61 ,  H04N19/62 ,  H04N19/63 ,  H04N19/647

    摘要： A video encoding system and method utilizes a three-dimensional (3-D) wavelet transform and entropy coding that utilize motion information in a way to reduce the sensitivity to motion. In one implementation, the coding process initially estimates motion trajectories of pixels in a video object from frame to frame in a video sequence to account for motion of the video object throughout the frames. After motion estimation, a 3-D wavelet transform is applied in two parts. First, a temporal 1-D wavelet transform is applied to the corresponding pixels along the motion trajectories in a time direction. The temporal wavelet transform produces decomposed frames of temporal wavelet transforms, where the spatial correlation within each frame is well preserved. Second, a spatial 2-D wavelet transform is applied to all frames containing the temporal wavelet coefficients. The wavelet transforms produce coefficients within different sub-bands. The process then codes wavelet coefficients: In particular, the coefficients are assigned various contexts based on the significance of neighboring samples in previous, current, and next frame, thereby taking advantage of any motion information between frames. The wavelet coefficients are coded independently for each sub-band to permit easy separation at a decoder, making resolution scalability and temporal scalability natural and easy. During the coding, bits are allocated among sub-bands according to a technique that optimizes rate-distortion characteristics.

    摘要翻译： 视频编码系统和方法利用利用运动信息的三维（3-D）小波变换和熵编码来降低对运动的敏感度。 在一个实施方案中，编码过程最初估计视频序列中的视频对象中的像素的运动轨迹，以考虑视频对象在整个帧中的运动。 运动估计后，三维小波变换分为两部分。 首先，沿时间方向沿着运动轨迹将时间1-D小波变换应用于相应的像素。 时间小波变换产生时间小波变换的分解帧，其中每帧内的空间相关性保持良好。 其次，将空间二维小波变换应用于包含时间小波系数的所有帧。 小波变换产生不同子带内的系数。 然后，该过程编码小波系数：特别地，基于前一帧，当前帧和下一帧中相邻采样的重要性，系数被分配各种上下文，从而利用帧之间的任何运动信息。 对于每个子带，小波系数被独立地编码，以便在解码器处容易地分离，使得分辨率可扩展性和时间可扩展性自然而简单。 在编码期间，根据优化速率失真特性的技术，在子带中分配比特。

    Seamless switching of scalable video bitstreams
    43.
    发明申请
    Seamless switching of scalable video bitstreams 有权
    可扩展视频比特流的无缝切换

    公开(公告)号：US20060067401A1

    公开(公告)日：2006-03-30

    申请号：US11280095

    申请日：2005-11-16

    申请人： Feng Wu ,  Shipeng Li ,  Xiaoyan Sun ,  Ya-Qin Zhang

    发明人： Feng Wu ,  Shipeng Li ,  Xiaoyan Sun ,  Ya-Qin Zhang

    IPC分类号： H04N11/04 ,  H04N7/12 ,  H04B1/66 ,  H04N11/02

    CPC分类号： G06T9/00 ,  H04N21/234327 ,  H04N21/2402 ,  H04N21/2662

    摘要： A seamless bitstream switching schema is presented. The schema takes advantage of both the high coding efficiency of non-scalable bitstreams and the flexibility of scalable bitstreams. Small bandwidth fluctuations are accommodated by the scalability of the bitstreams, while large bandwidth fluctuations are tolerated by switching among scalable bitstreams. This seamless bitstream switching schema significantly improves the efficiency of scalable video coding over a broad range of bit rates.

    摘要翻译： 提出了无缝比特流切换模式。 该模式利用了非可分级比特流的高编码效率和可扩展比特流的灵活性。 通过比特流的可扩展性来适应小的带宽波动，而通过在可缩放比特流之间切换来允许大的带宽波动。 这种无缝比特流切换架构显着提高了可扩展视频编码在广泛比特率下的效率。

    Video coding using bit-plane coding based on significance of neighboring samples
    45.
    发明申请
    Video coding using bit-plane coding based on significance of neighboring samples 审中-公开
    使用基于相邻样本的重要性的位平面编码的视频编码

    公开(公告)号：US20050002457A1

    公开(公告)日：2005-01-06

    申请号：US10901621

    申请日：2004-07-29

    申请人： Jizheng Xu ,  Shipeng Li ,  Ya-Qin Zhang

    发明人： Jizheng Xu ,  Shipeng Li ,  Ya-Qin Zhang

    IPC分类号： H04N7/12 ,  H04N7/26

    CPC分类号： H04N19/615 ,  H04N19/13 ,  H04N19/147 ,  H04N19/19 ,  H04N19/61 ,  H04N19/62 ,  H04N19/63 ,  H04N19/647

    摘要： A video encoding system and method utilizes a three-dimensional (3-D) wavelet transform and entropy coding that utilize motion information in a way to reduce the sensitivity to motion. In one implementation, the coding process initially estimates motion trajectories of pixels in a video object from frame to frame in a video sequence to account for motion of the video object throughout the frames. After motion estimation, a 3-D wavelet transform is applied in two parts. First, a temporal 1-D wavelet transform is applied to the corresponding pixels along the motion trajectories in a time direction. The temporal wavelet transform produces decomposed frames of temporal wavelet transforms, where the spatial correlation within each frame is well preserved. Second, a spatial 2-D wavelet transform is applied to all frames containing the temporal wavelet coefficients. The wavelet transforms produce coefficients within different sub-bands. The process then codes wavelet coefficients. In particular, the coefficients are assigned various contexts based on the significance of neighboring samples in previous, current, and next frame, thereby taking advantage of any motion information between frames. The wavelet coefficients are coded independently for each sub-band to permit easy separation at a decoder, making resolution scalability and temporal scalability natural and easy. During the coding, bits are allocated among sub-bands according to a technique that optimizes rate-distortion characteristics.

    摘要翻译： 视频编码系统和方法利用利用运动信息的三维（3-D）小波变换和熵编码来降低对运动的敏感度。 在一个实施方案中，编码过程最初估计视频序列中的视频对象中的像素的运动轨迹，以考虑视频对象在整个帧中的运动。 运动估计后，三维小波变换分为两部分。 首先，沿时间方向沿着运动轨迹将时间1-D小波变换应用于相应的像素。 时间小波变换产生时间小波变换的分解帧，其中每帧内的空间相关性保持良好。 其次，将空间二维小波变换应用于包含时间小波系数的所有帧。 小波变换产生不同子带内的系数。 然后，该过程编码小波系数。 特别地，根据前一帧，当前帧和下一帧中相邻采样的重要性，将系数分配给各种上下文，从而利用帧之间的任何运动信息。 对于每个子带，小波系数被独立地编码，以便在解码器处容易地分离，使得分辨率可扩展性和时间可扩展性自然而简单。 在编码期间，根据优化速率失真特性的技术，在子带中分配比特。

    Vector wavelet organization
    48.
    发明授权
    Vector wavelet organization 有权
    矢量小波组织

    公开(公告)号：US06298167B1

    公开(公告)日：2001-10-02

    申请号：US09177219

    申请日：1998-10-22

    申请人： Stephen A. Martucci ,  Iraj Sodagar ,  Ya-Qin Zhang

    发明人： Stephen A. Martucci ,  Iraj Sodagar ,  Ya-Qin Zhang

    IPC分类号： G06K936

    CPC分类号： H04N19/94 ,  H04N19/64 ,  H04N19/645 ,  H04N19/647

    摘要： Apparatus and method for encoding zerotrees in a wavelet-based coding technique. The method uses a depth-first pattern for traversing the zerotree, i.e., each branch of the tree, from parent to child to grandchild and so on, is fully traversed before a next branch is traversed. The depth-first tree traversal pattern is used to quantize the coefficients of the tree as well as to assign symbols to the quantized coefficients. The method assigns one of three symbols to each node: ZEROTREE ROOT, VALUED ZEROTREE ROOT, and VALUE. By using three symbols and the efficient tree traversal pattern, the method is substantially more efficient at encoding a zerotree than the prior art. Additionally, this concept is applied to the encoding of “vector” zerotrees.

    摘要翻译： 在基于小波的编码技术中编码零点的装置和方法。 该方法使用深度优先模式遍历零树，即树的每个分支，从父到子到孙，等等，在遍历下一个分支之前，完全遍历。 深度优先树遍历模式用于对树的系数进行量化，并将符号分配给量化系数。 该方法为每个节点分配三个符号之一：ZEROTREE ROOT，VALUED ZEROTREE ROOT和VALUE。 通过使用三个符号和有效的树遍历模式，该方法比现有技术在编码零树方面显着更有效率。 另外，这个概念被应用于“矢量”零点的编码。