23 November 2009 Anti aliasing technique in small object surface measurement
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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.
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Sheng Wei, Sheng Wei, Nansheng Liu, Nansheng Liu, Xiaorui Liu, Xiaorui Liu, Yiqing Wei, Yiqing Wei, Xiaopu Ai, Xiaopu Ai, Xian Hu, Xian Hu, } "Anti aliasing technique in small object surface measurement", 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; https://doi.org/10.1117/12.838349


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