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Analysis of CCD moiré pattern for micro-range measurements using the wavelet transform |
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| Authors: | Rong-Seng Chang Jin-Yi Sheu Ching-Huang Lin He-Chiang Liu |
| Institution: | a Institute of Optical Sciences, National Central University, Chung-Li 320, Taiwan, ROC;b Kwang Wu Institute of Technology, 151, I-Te St, Peitou, Taipei 112, Taiwan, ROC;c Hua Hsia College of Technology and Commerce, 111, Hwa-Hsin St, Chung Ho, Taipei 235, Taiwan, ROC |
| Abstract: | A new approach based on the moiré theory and wavelet transform (WT) is proposed for measuring the micro-range distance between a charge-couple-device (CCD) camera and a two-dimensional reference grating. The micro-range distance is determined by measuring the pitch of the moiré pattern image, which is digitized by a CCD camera. A one-dimensional WT algorithm is applied to estimate the pitch of the moiré pattern. Experimental results prove that this technique is very efficient and highly accurate. The moiré range finder is an economic technique for measuring a micro-range distance. |
| Keywords: | Wavelet Moiré CCD |
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