Abstract: This paper discussed the calculation method of rotation based on optical flow. Which is a non-touch measur- ing technique, and has important value in some special occasions. It is to set up rigid motion equations by optical flow character, and then using two-step iterative method to estimate motion equation and calculate rotation speed for each co- ordinate axis. In order to improve the computing speed, the matching algorithm based on gray-coded bit plane block is a- dopted in the measurement for displacement vector on the projection plane. hhe calculation is less complex because two characteristics blocks searching is done with simple logical XOR. hhe experiment results show the calculation is accu- ra飞e.

Key words: Video, Motion model, Optical flow, Angular velocity, Bit plane image, Block matching algorithm