Analysis of CCD moiré pattern for micro-range measurements using the wavelet transform

✍ Scribed by Rong-Seng Chang; Jin-Yi Sheu; Ching-Huang Lin; He-Chiang Liu

• Book ID: 104159769
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 110 KB
• Volume: 35
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(02)00122-6

✦ Synopsis

A new approach based on the moirà e 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 moirà e pattern image, which is digitized by a CCD camera. A one-dimensional WT algorithm is applied to estimate the pitch of the moirà e pattern. Experimental results prove that this technique is very e cient and highly accurate. The moirà e range ÿnder is an economic technique for measuring a micro-range distance.