A New Phase Alignment Method for Digital Projector in Phase Measuring Profilometry
基于数字投影仪的光栅相位自校正方法

A new phase alignment method for digital projector is proposed. In the phase measuring profilometry, a key problem is to project sinusoidal fringes. By the n step phase shifting method, the ideal phase can be obtained by the image of the fringes, then based on the mapping relations of the ideal phase and the actual phase, the phase pattern on the digital projector can be aligned automatically. Experiments show that the proposed method can decrease the error of the projected fringes effectively, and that better sinusoidal fringes can be achieved to improve the measurement precision.