| 摘要 |
A method and apparatus is disclosed for determining the speed and direction and height/width dimensions of subject movement within a field of view. Two video frames are compared such that the dimensions of change within the two frames are determined, sorted and counted. One count is made of the vertically-occurring change; the other count is made of the horizontally-occurring change. The derived change dimensions and position is stored to be later compared with the change dimensions and position of a following comparison of two scans; the lateral displacement of one change position of a prior time with respect to the change position of the present time is determined and counted, the count representing the magnitude and direction of the subject movement that occurred. These determinors are 'dumped' into a computer which detects certain types of change and ignores others and which may be operated to determine the velocity of horizontal movement as well as changes in velocity of vertical movement.
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