In micro aircraft design and testing, as well as motor and rotational motion monitoring, it will need to achieve a noncontact detection for rotational motion. HS (Horn and Schunck) algorithm is deduced under the premise that adjacent image intervals and the little change of image gray. HS algorithm is an optical flow calculation method that based on the image in the global smooth constraint. This paper propose an indicator that is used to characterize the optical flow field, and analyze the feasibility of the HS algorithm for the rotational motion measurement.
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