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Speed measurement system for individual vehicles in stream of traffic involves taking two difference pictures from three or more time-separated pictures to produce difference images?keyword=Speed measurement system for individual vehicles in stream of traffic involves taking two difference pictures from three or more time-separated pictures to produce difference images?keyword=Speed measurement system for individual vehicles in stream of traffic involves taking two difference pictures from three or more time-separated pictures to produce difference images?keyword=Speed measurement system for individual vehicles in stream of traffic involves taking two difference pictures from three or more time-separated pictures to produce difference images?keyword=Speed measurement system for individual vehicles in stream of traffic involves taking two difference pictures from three or more time-separated pictures to produce difference images?keyword=Speed measurement system for individual vehicles in stream of traffic involves taking two difference pictures from three or more time-separated pictures to produce difference images?keyword=Speed measurement system for individual vehicles in stream of traffic involves taking two difference pictures from three or more time-separated pictures to produce difference images?keyword=Speed measurement system for individual vehicles in stream of traffic involves taking two difference pictures from three or more time-separated pictures to produce difference images 专利,更快更准确