Adaptive motion estimator
    1.
    发明授权
    Adaptive motion estimator 有权
    自适应运动估计器

    公开(公告)号:US07551673B1

    公开(公告)日:2009-06-23

    申请号:US09980443

    申请日:1999-05-13

    摘要: A method and apparatus of encoding digital video according to the ISO/IEC MPEG standards (ISO/IEC 11172-2 MPEG-1 and ISO/IEC 13818-2 MPEG-2) using an adaptive motion estimator. A plurality of global motion vectors are derived from the motion vectors of a previous picture in a sequence, and the global motion vectors are analyzed to determine motion characteristics. The video encoding is arranged to enable switching among different types of local motion estimators based on the motion characteristics of the moving pictures sequence. This gives rise to a motion estimation algorithm that can adaptively change its search range, search area and block matching scheme to suit different types of moving sequences.

    摘要翻译: 使用自适应运动估计器根据ISO / IEC MPEG标准(ISO / IEC 11172-2 MPEG-1和ISO / IEC 13818-2 MPEG-2)编码数字视频的方法和装置。 从序列中的先前图像的运动矢量导出多个全局运动矢量,并且分析全局运动矢量以确定运动特性。 视频编码被布置成基于运动图像序列的运动特性来实现不同类型的局部运动估计器之间的切换。 这导致运动估计算法可以自适应地改变其搜索范围,搜索区域和块匹配方案以适应不同类型的移动序列。

    Moving pictures encoding with constant overall bit-rate
    2.
    发明授权
    Moving pictures encoding with constant overall bit-rate 有权
    以恒定的总比特率运动图像编码

    公开(公告)号:US07496142B2

    公开(公告)日:2009-02-24

    申请号:US11386184

    申请日:2006-03-22

    IPC分类号: H04N7/12

    摘要: A method and apparatus control bit rates used in a moving pictures encoder, such as an MPEG standard encoder. A sequence of moving pictures is divided into segments each of which comprises one or more groups of pictures. A constant overall bit rate is specified for the sequence of pictures, but variable bit rate encoding used within each segment. A difference between the number of bits allocated for encoding the segment and the actual bits used for encoding is determined, and the difference distributed over one or more subsequent segments.

    摘要翻译: 一种方法和装置控制在诸如MPEG标准编码器的运动图像编码器中使用的比特率。 一系列运动图像被分成多个段,每个段包括一组或多组图像。 为图像序列指定恒定的总比特率,但在每个片段中使用可变比特率编码。 确定分配用于编码段的位数与用于编码的实际位之间的差异,并且差异分布在一个或多个后续段上。

    Motion vector detection with local motion estimator
    3.
    发明授权
    Motion vector detection with local motion estimator 有权
    运动矢量检测与局部运动估计器

    公开(公告)号:US06876702B1

    公开(公告)日:2005-04-05

    申请号:US09807497

    申请日:1998-10-13

    IPC分类号: H04N7/26 H04N7/12

    CPC分类号: H04N19/51

    摘要: A method and apparatus of encoding digital video, for example according to the ISO/IEC MPEG standards (ISO/IEC 11172-2 MPEG-1 and ISO/IEC 13818-2 MPEG-2), which employs a local motion estimator for determining respective local motion vectors for groups of adjacent macroblocks in a picture. A local motion vector is determined for each row of macroblocks in a picture from the motion vectors of the macroblocks in that row. Then, for macroblocks in the corresponding row of a subsequently coded picture, the local motion vector can be used to select the search window used for determining the motion vectors. The local motion estimator improves search range and accuracy of macroblock motion vector detection without increasing the search window accessing bandwidth and caching requirement, and computation lode of searching.

    摘要翻译: 根据ISO / IEC MPEG标准(ISO / IEC 11172-2 MPEG-1和ISO / IEC 13818-2 MPEG-2)对数字视频进行编码的方法和装置,其采用局部运动估计器来确定各自的 用于图片中的相邻宏块组的局部运动矢量。 根据该行中的宏块的运动矢量来确定图像中的每一行宏块的局部运动矢量。 然后,对于随后编码图像的相应行中的宏块,可以使用局部运动矢量来选择用于确定运动矢量的搜索窗口。 局部运动估计器提高了宏块运动矢量检测的搜索范围和精度,而不增加搜索窗口访问带宽和缓存要求,以及搜索的计算量。

    Moving pictures encoding with constant overall bit rate
    4.
    发明授权
    Moving pictures encoding with constant overall bit rate 有权
    以恒定的总比特率运动图像编码

    公开(公告)号:US07092441B1

    公开(公告)日:2006-08-15

    申请号:US09646716

    申请日:1998-03-20

    IPC分类号: H04N7/12

    摘要: A method and apparatus control bit rates used in a moving pictures encoder, such as an MPEG standard encoder. A sequence of moving pictures is divided into segments each of which comprises one or more groups of pictures. A constant overall bit rate is specified for the sequence of pictures, but variable bit rate encoding is used within each segment. A difference between the number of bits allocated for encoding the segment and the actual bits used for encoding is determined, and the difference is distributed over one or more subsequent segments.

    摘要翻译: 一种方法和装置控制在诸如MPEG标准编码器的运动图像编码器中使用的比特率。 一系列运动图像被分成多个段,每个段包括一组或多组图像。 为图像序列指定恒定的总比特率,但在每个片段中使用可变比特率编码。 确定分配用于编码该段的位数与用于编码的实际位之间的差异,并且该差在一个或多个后续段上分布。