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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 47, Iss. 29 — Oct. 10, 2008
  • pp: 5400–5407

Intensity range extension method for three-dimensional shape measurement in phase-measuring profilometry using a digital micromirror device camera

Shien Ri, Motoharu Fujigaki, and Yoshiharu Morimoto  »View Author Affiliations

Applied Optics, Vol. 47, Issue 29, pp. 5400-5407 (2008)

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Phase-measuring profilometry is an accurate and effective technique for performing three-dimensional (3D) shape and deformation measurements of diffuse objects by fringe projection. However, phase analysis cannot be performed in underexposed or overexposed areas of the detector when an object with wide reflectance is measured. A novel intensity range extension method using a digital micromirror device (DMD) camera is proposed. In the optics of the DMD camera, each pixel of the CCD corresponds exactly to each mirror of the DMD. The phase-shifted fringe patterns with high contrast can be easily captured by programming an inverse intensity pattern that depends on the reflectance of the object. Our method can provide a wider intensity range and higher accuracy for 3D shape measurement than other conventional methods in both underexposed and overexposed areas. The measurements of a replica of a metallic art object and a flat plane are analyzed experimentally to verify the effectiveness of our method. In the experiment, the percentage of invalid points due to underexposure and overexposure can be reduced from 20% to 1%.

© 2008 Optical Society of America

OCIS Codes
(100.2980) Image processing : Image enhancement
(110.6880) Imaging systems : Three-dimensional image acquisition
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

ToC Category:
Image Processing

Original Manuscript: June 17, 2008
Revised Manuscript: August 27, 2008
Manuscript Accepted: September 2, 2008
Published: October 8, 2008

Shien Ri, Motoharu Fujigaki, and Yoshiharu Morimoto, "Intensity range extension method for three-dimensional shape measurement in phase-measuring profilometry using a digital micromirror device camera," Appl. Opt. 47, 5400-5407 (2008)

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