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    Digital video decoder and method of decoding a digital video signal
    2.
    发明授权
    Digital video decoder and method of decoding a digital video signal 失效
    数字视频解码器和解码数字视频信号的方法

    公开(公告)号：US06144698A

    公开(公告)日：2000-11-07

    申请号：US742124

    申请日：1996-10-31

    申请人： Tommy C. Poon ,  Huifang Sun ,  Jay Bao ,  Anthony Vetro

    发明人： Tommy C. Poon ,  Huifang Sun ,  Jay Bao ,  Anthony Vetro

    IPC分类号： H04N7/32 ,  H04N7/26 ,  H04N7/36 ,  H04N7/50 ,  H04N7/12

    CPC分类号： H04N19/90 ,  H04N19/423 ,  H04N19/428 ,  H04N19/48 ,  H04N19/51 ,  H04N19/61

    摘要： A digital video decoder and method therefor receives a digital video signal and performs motion compensation on the digital video signal in the frequency domain. The motion compensation is performed by forming, for each inter-coded picture in the digital video signal, a composite picture in the frequency domain representing a reference picture corresponding to the inter-coded picture, and then adding the composite picture to the corresponding inter-coded picture. Each macro block of the composite picture is formed based on corresponding macro blocks of at least one anchor picture stored in memory. The anchor pictures are stored as compressed bits via quantization and variable length coding of frequency domain blocks to reduce required memory capacity. The synthesis technique employed by the compositor to form the composite macro blocks accounts for both field and frame motion compensation with half-pel accuracy. The intra-coded pictures produced as a result of the motion compensation are then reformatted in a display order.

    摘要翻译： 数字视频解码器及其方法接收数字视频信号并对频域中的数字视频信号执行运动补偿。 通过对数字视频信号中的每个帧间编码图像形成表示与帧间编码图像相对应的参考图像的频域中的合成图像，然后将合成图像相加到相应的帧间编码图像， 编码图片。 基于存储在存储器中的至少一个锚图像的相应宏块形成复合图像的每个宏块。 锚图像通过频域块的量化和可变长度编码被存储为压缩比特以减少所需的存储容量。 合成器用于形成复合宏块的综合技术考虑了半像素精度的场和帧运动补偿。 作为运动补偿的结果产生的帧内编码图像然后以显示顺序重新格式化。

    Video transcoder with spatial resolution reduction
    3.
    发明授权
    Video transcoder with spatial resolution reduction 有权
    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。

    Video transcoder with drift compensation
    4.
    发明授权
    Video transcoder with drift compensation 有权
    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。

    Method and apparatus for down-converting a digital signal
    5.
    发明授权
    Method and apparatus for down-converting a digital signal 失效
    用于下变频数字信号的方法和装置

    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

    IPC分类号： H04N7/01 ,  H04N7/26

    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。

    Methods of scene fade detection for indexing of video sequences
    7.
    发明授权
    Methods of scene fade detection for indexing of video sequences 有权
    视频序列索引的场景淡入淡出检测方法

    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。

    Method and System for Decoding Multiview Videos with Prediction Dependencies
    8.
    发明申请
    Method and System for Decoding Multiview Videos with Prediction Dependencies 有权
    用预测依赖关系解码多视点视频的方法和系统

    公开(公告)号：US20100322311A1

    公开(公告)日：2010-12-23

    申请号：US12871249

    申请日：2010-08-30

    申请人： Anthony Vetro ,  Huifang Sun ,  Jun Xin ,  Emin Martinian ,  Alexander Behrens

    发明人： Anthony Vetro ,  Huifang Sun ,  Jun Xin ,  Emin Martinian ,  Alexander Behrens

    IPC分类号： H04N7/32

    CPC分类号： H04N19/615 ,  H04N19/105 ,  H04N19/13 ,  H04N19/46 ,  H04N19/597 ,  H04N19/61 ,  H04N19/63

    摘要： Multiview videos are acquired of a scene with corresponding cameras arranged at poses, such that there is view overlap between any pair of cameras. V-frames are generated from the multiview videos. The V-frames are encoded using only spatial prediction. Then, the V-frames are inserted periodically in an encoded bit stream to provide random temporal access to the multiview videos. Additional view dependency information enables the decoding of a reduced number of frames prior to accessing randomly a target frame for a specified view and time, and decoding the target frame. The method also decodes multiview videos by maintaining a reference picture list for a current frame of a plurality of multiview videos, and predicting each current frame of the plurality of multiview videos according to reference pictures indexed by the associated reference picture list.

    摘要翻译： 多视点视频被采集到具有以姿势布置的相应摄像机的场景，使得在任何一对摄像机之间存在视图重叠。 V帧是从多视角视频生成的。 V帧仅使用空间预测编码。 然后，将V帧周期性地插入到编码比特流中，以便为多视点视频提供随机的时间访问。 附加的视图依赖性信息使得能够在对指定的视图和时间的随机访问目标帧之前对减少数量的帧进行解码，以及对目标帧进行解码。 该方法还通过维护多个多视角视频的当前帧的参考图片列表，并根据由相关参考图片列表索引的参考图片来预测多个多视角视频中的每个当前帧来对多视点视频进行解码。