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Proceedings Paper

Anti aliasing technique in small object surface measurement
Author(s): Sheng Wei; Nansheng Liu; Xiaorui Liu; Yiqing Wei; Xiaopu Ai; Xian Hu
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Paper Abstract

The π phase-shifting technique have used early to remedy frequency aliasing in Fourier transform profilometry , two deforming stripe of phase difference π is photographed and then subtracted to remove the influence of zero frequency and high frequency. Due to background of measured object represent zero frequency of deforming stripe in frequency-domain, image processing based wavelet transform is described to separate background image through image wavelet decomposition, then original image and background image is subtracted to remove the influence of zero frequency, and so fundamental frequency extracted easily. The proposed method reserve merit of frequency domain phase demodulation with low equipment cost and fast convenience. The proposed method is tested through three-dimensional surface sensing experiment of arc welding pool.

Paper Details

Date Published: 23 November 2009
PDF: 8 pages
Proc. SPIE 7508, 2009 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 75081K (23 November 2009); doi: 10.1117/12.838349
Show Author Affiliations
Sheng Wei, Nanchang Univ. (China)
Nansheng Liu, Nanchang Univ. (China)
Xiaorui Liu, Nanchang Univ. (China)
Yiqing Wei, Nanchang Univ. (China)
Xiaopu Ai, Nanchang Univ. (China)
Xian Hu, Nanchang Univ. (China)


Published in SPIE Proceedings Vol. 7508:
2009 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications
YanBiao Liao; Anbo Wang; Tingyun Wang; Yukihiro Ishii, Editor(s)

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