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Optics Letters

Optics Letters


  • Vol. 27, Iss. 16 — Aug. 15, 2002
  • pp: 1466–1468

Frequency-multiplexed profilometric phase coding for three-dimensional object recognition without 2π pi phase ambiguity

Debesh Choudhury and Mitsuo Takeda  »View Author Affiliations

Optics Letters, Vol. 27, Issue 16, pp. 1466-1468 (2002)

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A novel phase-coding technique based on Fourier-transform profilometry (FTP) is proposed for three-dimensional object recognition. Two spatially multiplexed grating patterns of different spatial frequencies are projected simultaneously onto the objects–target, and the phase changes in the distorted patterns are detected. An algebraic addition or subtraction of these phase values is utilized to code the two-dimensional plans of the objects–target with spatial harmonic modulations. The phase-coded plans of the objects and the target are cross correlated digitally to yield a high correlation peak at the target location. The 2π ambiguity of the phase associated with FTP has been resolved in correlation results without recourse to phase unwrapping. Experimental results show an excellent discrimination capability for target recognition.

© 2002 Optical Society of America

OCIS Codes
(070.2590) Fourier optics and signal processing : ABCD transforms
(070.4550) Fourier optics and signal processing : Correlators
(100.4550) Image processing : Correlators
(100.6890) Image processing : Three-dimensional image processing
(120.2650) Instrumentation, measurement, and metrology : Fringe analysis
(150.6910) Machine vision : Three-dimensional sensing

Debesh Choudhury and Mitsuo Takeda, "Frequency-multiplexed profilometric phase coding for three-dimensional object recognition without 2π pi phase ambiguity," Opt. Lett. 27, 1466-1468 (2002)

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