Fringe projection profilometry (FPP) has been widely used in various fields because of its high precision and efficiency. However, fringe images containing overexposed areas are obtained by traditional FPP for high-reflective object surfaces, which leads to errors in absolute phase and three-dimensional (3D) reconstruction results. A robust 3D reconstruction technique based on a polarization state-based ternary polarization coding strategy is proposed to address these errors. Instead of the light intensity coding patterns, the polarization coding patterns are used in this method. Next, the S1 image is calculated using the polarization image captured by the camera. The Stokes parameter is utilized to segment the fringe codewords without using a specially designed threshold. The proposed method enhanced the stability of the fringes, improved the quality of the fringes, and reduced the number of fringe patterns. Experimental results verified that the proposed method has higher robustness than the conventional method in the measurement of objects with high-reflective surfaces. The results reveal that the proposed method can suppress the effect of highlight areas in the reconstruction of high-reflective surfaces to obtain accurate absolute phases and reconstruct the 3D point cloud data reliably.

中文翻译：

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基于三元偏振编码策略的鲁棒3D重建技术

条纹投影轮廓仪（FPP）因其高精度和高效率而被广泛应用于各个领域。然而，传统的FPP针对高反射物体表面获得的条纹图像包含过度曝光区域，这导致绝对相位和三维（3D）重建结果出现误差。提出了一种基于偏振态三元偏振编码策略的鲁棒 3D 重建技术来解决这些错误。在该方法中使用偏振编码图案来代替光强度编码图案。接下来，使用相机捕获的偏振图像计算S1图像。利用Stokes参数对边缘码字进行分割，无需使用专门设计的阈值。所提出的方法增强了条纹的稳定性，提高了条纹的质量，并减少了条纹图案的数量。实验结果验证了该方法在高反射表面物体的测量中比传统方法具有更高的鲁棒性。结果表明，该方法可以抑制高反射表面重建中高光区域的影响，获得准确的绝对相位并可靠地重建3D点云数据。