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

Rong Seng Chang, Jin Yi Sheu, Ching Huang Lin, He Chiang Liu

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

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.

Original languageEnglish
Pages (from-to)43-47
Number of pages5
JournalOptics and Laser Technology
Volume35
Issue number1
DOIs
StatePublished - Feb 2003

Keywords

  • CCD
  • Moiré
  • Wavelet

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