光学学报, 2018, 38 (4): 0412005, 网络出版: 2018-07-10   

提高多频条纹投影相位提取精度的反向误差补偿法 下载: 1254次封面文章

Inverse Error Compensation Method for Improvement of Phase Recovery Accuracy of Multi-Frequency Fringe Projection
作者单位
1 合肥工业大学仪器科学与光电工程学院, 安徽 合肥 230009
2 南阳理工学院机械与汽车工程学院, 河南 南阳 473004
摘要
为了减小光栅投影三维测量系统中数字投影仪的非线性响应引起的相位误差,提出了一种提高物体相位测量精度和速度的多频条纹反向相位误差补偿方法。该方法通过投影与最高频率相同且具有特定相移量的补偿相移条纹图,获取相位误差大小相等,符号相反的两幅主值相位图,二者运算后误差得以抵消,与多频法相结合从而得到精确的绝对相位值。采用标准平面对提出的方法进行实验验证,并与最近提出的希尔伯特变换补偿方法以及典型相位补偿方法进行比较。实验结果表明,所提方法能有效提高相位测量的精度和速度。通过对自由曲面以及表面不连续物体进行相位误差补偿,进一步验证了该方法的可行性和有效性。
Abstract
In order to reduce the phase error caused by the nonlinear response of digital projectors in three-dimensional measurement system of grating projection, a multi-frequency fringe inverse-phase error compensation method is proposed for improving the accuracy and speed of the object phase measurement. By projecting the compensated phase-shifted fringe pattern with the same maximum phase frequency and the same phase shift, the two phased phase diagrams with the same phase error and opposite signs are obtained. After the operation, their errors are canceled and compared with the multi-frequency method to get the exact absolute phase value. A standard plane is used for verifying the proposed method, the comparisons are done with recently proposed Hilbert transform compensation method and classical phase compensation method. The experiments results show that the proposed method can improve the accuracy and speed of phase measurement effectively. The feasibility and validity of the proposed method is verified by phase error compensation for a free form surface and object of discontinuous surface.

毛翠丽, 卢荣胜. 提高多频条纹投影相位提取精度的反向误差补偿法[J]. 光学学报, 2018, 38(4): 0412005. Cuili Mao, Rongsheng Lu. Inverse Error Compensation Method for Improvement of Phase Recovery Accuracy of Multi-Frequency Fringe Projection[J]. Acta Optica Sinica, 2018, 38(4): 0412005.

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