GLOBAL MOTION ESTIMATION

专利名称：GLOBAL MOTION ESTIMATION 发明人：NILSSON, Michael Erling
申请号：EP06709625.5
申请日：20060203
公开号：EP1859627B1
公开日：
20180103
专利内容由知识产权出版社提供
摘要：A global motion vector for a first video frame identifies a shift that, when applied to another frame of a television picture, increases the similarity between the two frames. In order to estimate this shift the method comprises selecting picture elements from the first frame; comparing the selected picture elements with correspondingly positioned picture elements of the other frame to produce a measure of similarity in respect of zero shift; comparing, for each of a plurality of trial shifts, the selected picture elements with picture elements of the other frame that have the same mutual positions but shifted by the respective shift, to produce a measure of similarity in respect of that shift; and identifying that shift (or zero) which gives rise to a measure indicative of high similarity. The number of selected picture elements is in the range of 0.1 % to 5% of the total number of picture elements in the frame - for example, they may be taken only from selected lines of the picture, the number of selected lines being less than 5% of the total number of lines in the frame - possibly even as few as three. The selected picture elements consist of a set of contiguous picture elements taken from the central portion of each selected line. The shifts considered may be primarily or even exclusively horizontal.
申请人：BRITISH TELECOMM
地址：GB
国籍：GB
代理机构：British Telecommunications public limited company Intellectual Property Department
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