Method and apparatus for supporting motion scalability
    61.
    发明申请
    Method and apparatus for supporting motion scalability 审中-公开
    支持运动可伸缩性的方法和装置

    公开(公告)号:US20050226335A1

    公开(公告)日:2005-10-13

    申请号:US11104640

    申请日:2005-04-13

    摘要: A method and apparatus for supporting scalability for motion vectors in scalable video coding are provided. The motion estimation apparatus includes a motion estimation module searching for a variable block size and a motion vector that minimize a cost function for each layer according to predetermined pixel accuracy, a sampling module upsampling an original frame when the pixel accuracy is less than a pixel size, and before searching for a motion vector in a layer having a lower resolution than the original frame downsampling the original frame into the low resolution, a motion residual module calculating a residual between motion vectors found in the respective layers, and a rearrangement module rearranging the residuals between the found motion vectors and the found variable block size information using significance obtained from a searched lower layer. Accordingly, true motion scalability can be achieved to improve adaptability to changing network circumstances.

    摘要翻译: 提供了一种用于支持可伸缩视频编码中的运动矢量的可扩展性的方法和装置。 运动估计装置包括:运动估计模块,用于根据预定的像素精度搜索可变块大小和每个层的成本函数最小化的运动矢量;当像素精度小于像素尺寸时,采样模块对原始帧进行上采样 并且在将具有比原始帧低的原始帧的分辨率低的层的运动矢量搜索到低分辨率之前,运动残差模块计算在各个层中找到的运动矢量之间的残差,以及重新排列模块 找到的运动矢量之间的残差和使用从搜索到的下层获得的显着性的找到的可变块大小信息。 因此,可以实现真实的运动可伸缩性,以提高对网络环境变化的适应性。

    Bit-rate control method and apparatus for normalizing visual quality
    62.
    发明申请
    Bit-rate control method and apparatus for normalizing visual quality 审中-公开
    用于使视觉质量正常化的比特率控制方法和装置

    公开(公告)号:US20050084015A1

    公开(公告)日:2005-04-21

    申请号:US10968491

    申请日:2004-10-20

    摘要: A scalable video codec includes an encoder that encodes an original moving picture; a rate control unit that allocates an optimal amount of bits for each coding unit based on a bit-rate desired by a user; a pre-decoder that receives a bit-stream and extracts a bit-stream having an appropriate amount of bits; and a decoder that decodes image sequences of the moving picture from the extracted bit-stream, so as to reconstruct the original moving picture. In particular, the present invention focuses on the operation performed in the rate control unit 340. The rate control unit operates a definition step of a bit-rate function available for use in the predecoder, a pre-summation step to thereby obtain the uniform visual quality, an approximation to determine the distortion function, and a normalization step to allow the total allocated bit-rates to be equal to a target bit-rate.

    摘要翻译: 可分级视频编解码器包括对原始运动图像进行编码的编码器; 速率控制单元,其基于用户期望的比特率为每个编码单元分配最佳的比特量; 接收比特流并提取具有适当位数的比特流的预解码器; 以及解码器,其从提取的比特流解码运动图像的图像序列,以便重构原始运动图像。 特别地,本发明着重于在速率控制单元340中执行的操作。 速率控制单元操作可用于预解码器的比特率函数的定义步骤,预先求和步骤,从而获得均匀的视觉质量,确定失真函数的近似值,以及允许总数的归一化步骤 分配的比特率等于目标比特率。