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
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.
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.