Abstract
Received 14 February 2012; received in revised form March 27 2012; accepted March 28 2012ABSTRACTReal-time three-dimensional shape measurement is becoming increasingly important in variousfields, including medical sciences, high-technology industry, and microscale measurements.However, there are not so many 3D profile tools specially designed for specifically narrowspace, for example, to scan the tooth shape of a human jaw. In this paper, a real-time 3Dintraoral scanner is proposed for the measurement of tooth profile in the mouth cavity. The pro-posed system comprises a laser diode beam, a micro charge-coupled device, a graticule, a piezo-electric transducer, a set of optical lenses, and a polhemus device sensor. The phase-shiftingtechnique is used along with an accurate calibration method for the measurement of the toothprofile. Experimental and theoretical inspection of the phase-to-coordinate relation is presented.In addition, a nonlinear system model is developed for collimating illumination that gives themore accurate mathematical representation of the system, thus improves the shape measurementaccuracy. Experiment results are presented to verify the feasibility and performance of the devel-oped system. The experimental results indicate that overall measurement error accuracy can becontrolled within 0.4 mm with a variability of ±0.01. Key Words: Calibration, Camera-laser scanner, Virtual fringe-projection setup
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