Abstract
An improved tripolar pulse width modulation method has been proposed in this paper. According to the linear effect of optical system defocusing, the three-gray-level structured light pattern can be split into two binary ones. With the composite image, the same measurement result as the tripolar method is obtained. Simulation result shows that, under three-step phase shifting method, the error of phase retrieval is greatly eliminated. Thus, the proposed method can achieve better depth reconstruction results than PWM method. Furthermore, both simulation and experimental results show that the measurement range of this method is effectively extended.
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