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In this paper, a novel data processing algorithm for ultrasonic sensors is proposed using optical flow technique to get relative velocity of obstacles. Ultrasonic sensors are widely applied to robotic system, however, limitations exist for positioning objectpsilas location by angular uncertainty. Collision avoidance in dynamic environment requires the information of relative motion, such as velocity for obstacles in addition to distance. To assist operatorpsilas control skills, a force is generated for collision avoidance using ultrasonic sensorspsila data. Previous research on the generation algorithm of force reflection used relative distance between robot and obstacles. We applied optical flow technique to artificial image sequence which is generated from ultrasonic sensorpsilas range data to obtain relative velocity. The experimental results show the effectiveness of the proposed algorithm for robot navigation in dynamic environment.