Block-matching motion estimator for video coder
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United States of America Patent
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Apr 6, 1993
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N/A
app pub date -
Apr 26, 1991
filing date -
Apr 26, 1991
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Abstract
A method and apparatus (110) for performing block-matching motion estimation in a video coder is disclosed which estimates the motion vector associated with each block of pels in the current coding frame. The motion vector for each block in the current frame is estimated by searching through a larger search window in the previous frame for a best match. At each possible shift position within the search window a pel-by-pel comparison (304) is made between the intensity of the pels in the block in the current frame and the corresponding pels in the previous frame. Each pel is classified as either a matching pel or a mismatching pel depending upon the pel difference and a threshold (306). The number of matching pels at each possible shift position is counted (307) and the motion vector is determined from the shift position that yields the maximum number of matching pels.
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