Filter Dependence on the Phase Error of Fourier Transform Profilometry

Yeon Serk Yu; Meyong Ho Lee  and Woo Young Song

doi:10.17485/ijst/2015/v8i13/68349

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Filter Dependence on the Phase Error of Fourier Transform Profilometry

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Indian Journal of Science and Technology

DOI: 10.17485/ijst/2015/v8i13/68349

Year: 2015, Volume: 8, Issue: 13, Pages: 1-6

Original Article

Filter Dependence on the Phase Error of Fourier Transform Profilometry

Yeon-Serk Yu^1*, Meyong-Ho Lee² and Woo-Young Song²

¹ Department of Laser & Optical Information Engineering, Cheong Ju University, Korea; [email protected]

²Department of Electronic Engineering, Cheong Ju University, Korea

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

In phase measuring fringe reflection Fourier transform profilometry, it gets the captured image data from the projected sinusoidal fringe patterns by using the CCD cameras. Added white noise in captured fringe images and its low contrast levels affect the accuracy of three-dimensional surface profile measurements induced the phase errors. In this work, we present phase error reduction method using the low pass spatial image filter and median filter. Experimental results are also demonstrated to evaluate the effectiveness of the low pass filter and median filter. The result shows that white noise in the fringe pattern can be effectively removed and filtered fringe is smoothed. In case of the median filter, it showed negative influence to the phase error, but the low-pass filter evidently reduced the phase error about 30 percent.

Keywords: Fourier Transform Profilometry, Low Pass Filter, Median Filter Phase Error