抑制相位测量轮廓术饱和误差相位融合算法

在相位测量轮廓术中,由于被测物体表面反射率过大,导致照相机捕获的图像中部分像素点强度值超过照相机的最大量化值,即光强度饱和。分析了光强度饱和引起的相位误差,提出一种相位融合算法。该算法通过查找归一化后的最大调制强度,提取其对应的相位,并将该相位作为三维重建的最终相位。实验结果表明,在理想情况及测量系统存在Gamma畸变时该算法均能有效地修复饱和误差。当测量系统存在Gamma畸变时,校正后相位误差均方根值相对于传统技术减小了58.86%。

A novel phase fusion algorithm of restraining saturation error in phase measuring profilometry

In phase measuring profilometry(PMP), the intensity values exceed the maximum quantization range of camera because of the larger surface reflectivity of object, that is intensity saturation. This paper analyzes phase error caused by intensity saturation, and proposes a phase fusion algorithm. Using this algorithm, we find the largest normalized modulation intensity of each pixel, and extract the corresponding phase and fuse them. The proposed method can effectively restrain the saturation error in the ideal situation and in the situation where exists gamma distortion in the camera-projector pair. The corrected phase error decrease 558.86% in experiment.