| 摘要 |
Image motion flags or vectors are derived by subtracting a first image frame from the succeeding image and thresholding the absolute difference. To remove noise in the form of isolated motion flags from the resulting signal the input m is passed directly and via two pixel delays delta pa1, delta pa2 to the three inputs of an AND gate, the output of which is supplied directly and via two pixel delays delta pb1, delta pb2 to an OR gate to produce a replica of the input motion flag. If it is desired to accept image motion flags of only two pixels duration switches may set one input of the AND and OR gates to "1" and "0" respectively. Image motion may be classified into four classes - fully moving, covering, uncovering, static - by comparing the motion flags derived over two successive interframe periods; alternatively the motion class signals may provide the input to the motion flag filter. <IMAGE> |
