相位测量偏折术中基于亚像素相移的噪声抑制算法

刘元坤; 苏显渝; 张启灿

光学与光电技术, 2009, 7 (4): 33, 网络出版: 2009-12-30

相位测量偏折术中基于亚像素相移的噪声抑制算法

Noise Reduction Based on Sub-Pixel Phase-Shift Algorithm in Phase Measuring Deflectometry

论文大纲

刘元坤 ^*苏显渝张启灿

作者单位

四川大学光电科学技术系，四川成都 610064

相位测量偏折术亚像素相移算法噪声抑制 phase measuring deflectometry sub-pixel phase-shift noise reduction

摘要

由于在相位测量偏折术中一般采用数字投影设备或者数字显示设备，相移间隔为若干像素，最小相移量为单个像素，因此对噪声的抑制也是有限的，为此提出一种基于亚像素相移的噪声抑制算法，通过正弦条纹灰度的连续变化来实现亚像素相移，从而增加相移帧数。并采用N-Bucket算法，解决了相移帧数增加后的计算量问题。计算机模拟及实验均表明，该方法可以有效地抑制噪声影响，提高测量精度。为实际应用中合理地选择相移算法提供了理论依据。

Abstract

Normally, the digital devices such as computer-controlled screen and digital projector are always used in PMD system. Therefore there is a minimum interval of phase shift namely one-pixel phase-shift. The phase shift number is not infinite, and then the noise reduction is not good. In this paper, an algorithm named sub-pixel phase-shift technique is introduced into the PMD system. The results of numerical simulation and experiments have confirmed its ability of reducing the noise efficiently and improving the measurement precision.

参考文献

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刘元坤, 苏显渝, 张启灿. 相位测量偏折术中基于亚像素相移的噪声抑制算法[J]. 光学与光电技术, 2009, 7(4): 33. LIU Yuan-kun, SU Xian-yu, ZHANG Qi-can. Noise Reduction Based on Sub-Pixel Phase-Shift Algorithm in Phase Measuring Deflectometry[J]. OPTICS & OPTOELECTRONIC TECHNOLOGY, 2009, 7(4): 33.

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