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    • 1. 发明授权
    • Motion vector selection based on a preferred point
    • 基于优选点的运动矢量选择
    • US06931066B2
    • 2005-08-16
    • US10715894
    • 2003-11-18
    • Swee-San TeeKah-Ho PhongJean-Michel BardLucas Y. W. Hui
    • Swee-San TeeKah-Ho PhongJean-Michel BardLucas Y. W. Hui
    • H04N7/12H04N7/26
    • H04N19/51
    • A method of selecting a motion vector for use in a motion estimation system in which the motion vector defines movement of a block of pixels between a search window and a reference frame. The method includes the steps of scanning a search window in a fixed order for a suitable match with an area of the reference frame such that each search position within a current row or column of the window is one pixel away from a previous search position, defining a preferred point in the search window, calculating a primary norm function with reference to the preferred point for a given position in each row or column, calculating a norm function for each search position based on a linear increment of the primary norm function for the respective row or column, calculating an Absolute Error (AE) for each search position, based on a difference between a given property of the search position and a position in the reference window, and selecting a motion vector, the displacement of the motion vector defined in terms of the search position having the smallest AE and the smallest norm function. An apparatus for performing the method is also disclosed.
    • 一种选择用于运动估计系统的运动矢量的方法,其中运动矢量定义搜索窗口和参考帧之间的像素块的移动。 该方法包括以固定顺序扫描搜索窗口以与参考帧的区域进行合适的匹配的步骤,使得窗口的当前行或列内的每个搜索位置距离先前搜索位置一个像素,定义 在搜索窗口中的优选点,参考每行或列中的给定位置的优选点来计算主范数函数,基于各个搜索位置的主范数函数的线性增量来计算每个搜索位置的范数函数 行或列,基于搜索位置的给定属性与参考窗口中的位置之间的差计算每个搜索位置的绝对误差(AE),并且选择运动矢量,定义在 具有最小AE和最小范数函数的搜索位置的项。 还公开了一种用于执行该方法的装置。
    • 4. 发明授权
    • Motion vector detection with local motion estimator
    • 运动矢量检测与局部运动估计器
    • US06876702B1
    • 2005-04-05
    • US09807497
    • 1998-10-13
    • Yau Wai Lucas HuiHong Lye OhJean-Michel Bard
    • Yau Wai Lucas HuiHong Lye OhJean-Michel Bard
    • H04N7/26H04N7/12
    • H04N19/51
    • 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.
    • 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。