The study of optical feature point imaging gray value automation control method with movement

In order to solve the problem that feature point imaging quality affects the measurement precision of vision system, a method of optical feature point imaging gray value automation control with movement is proposed. The method eliminates the effect of the relative position changes of camera and feature point on imaging gray value by automatic modulating the current in the feature point and camera exposure time. To control the luminance of feature point automatically, a invariable current source which may be controlled by program is constructed using digitally controlled potentiometer, dynatron, operational amplifier and so on. The experiments prove that the system hold nicer linearity, good sensitivity and response, the control method makes it true that the imaging value of feature point always keeps in the ideal range.