| 相位测量轮廓术中结合几何标定的非线性校正（英） |
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| 引用本文： | 刘凯,龙云飞,王帅军,吴炜,杨晓敏. 相位测量轮廓术中结合几何标定的非线性校正（英）[J]. 强激光与粒子束, 2015, 27(7): 071005. DOI: 10.11884/HPLPB201527.071005 |
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| 作者姓名： | 刘凯 龙云飞 王帅军 吴炜 杨晓敏 |
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| 作者单位： | 1.四川大学 电气信息学院, 成都 61 0065; |
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| 摘 要： | 提出了一种嵌入到常规几何标定过程中的非线性校正算法。该方法通过相位获取投影图案与拍摄图像对应点之间的亮度关系，进而确定系统的非线性亮度响应。该算法在几何标定进行的同时，无需调整系统设置或投影额外的结构光图案，直接导出用于非线性预补偿的灰度查找表。实验结果表明，校正后的相位误差比校正前减少了约95%。
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| 关 键 词： | 相位测量轮廓术 结构光 三维测量 非线性畸变 系统标定 |
| 收稿时间： | 2015-03-12 |
Nonlinearity calibration incorporated with geometrical calibration for phase measuring profilometry |
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| Affiliation: | 1.School of Electrical Engineering and Information,Sichuan University,Chengdu 610065,China;2.College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,China |
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| Abstract: | In this paper, we present an algorithm, which is incorporated into geometrical calibration, to accurately and efficiently calibrate and correct the nonlinearity. The proposed method utilizes phase to obtain the intensity correspondences between projected patterns and recorded images. Based on the intensity correspondences, the nonlinear response of the system is further retrieved. Along with geometrical calibration, without adjusting setup or using any additional specially-designed structured light patterns, a look-up table for correcting the nonlinear response is directly and accurately derived, and is applied to the intensities of the patterns before projection. Experiments show that the root mean square of the phase error is significantly reduced by a factor of 21.8 times. |
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