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摘要: 提出了一种针对数字投影仪的光栅相位自校正方法. 在基于光栅投影的主动式视觉三维测量技术中, 投影出具有标准正弦分布的光栅条纹是其关键环节之一. 对投影仪投出的光栅条纹, 应用n步相移法通过条纹图像得到其理想的相位分布, 然后根据理想相位分布和实际相位分布的映射关系, 对投影仪的光栅模式进行自校正. 实验结果表明, 经过3～5次自校正后, 投影仪投影出的光栅条纹质量有了很大的提高, 可以得到较理想的正弦分布的投影光栅.Abstract: 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.
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Key words:
- Optical measurement /
- projected fringe /
- phase alignment
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