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Applied Optics

Applied Optics


  • Vol. 40, Iss. 26 — Sep. 10, 2001
  • pp: 4661–4666

Projection-invariant pattern recognition with logarithmic harmonic function and wavelet transform

Yih-Shyang Cheng and Hui-Chi Chen  »View Author Affiliations

Applied Optics, Vol. 40, Issue 26, pp. 4661-4666 (2001)

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A logarithmic harmonic filter can detect objects at different projection angles. The Mexican-hat wavelet function can extract edges of equal width for objects, regardless of their sizes. Hence incorporating wavelet filtering in the logarithmic harmonic filter can improve its performance. The theory is presented together with computer simulation. Finally, an experiment using a joint transform correlator is presented to verify the capability of the proposed filter.

© 2001 Optical Society of America

OCIS Codes
(070.4550) Fourier optics and signal processing : Correlators
(070.5010) Fourier optics and signal processing : Pattern recognition
(070.6110) Fourier optics and signal processing : Spatial filtering
(100.7410) Image processing : Wavelets

Original Manuscript: January 24, 2001
Revised Manuscript: May 31, 2001
Published: September 10, 2001

Yih-Shyang Cheng and Hui-Chi Chen, "Projection-invariant pattern recognition with logarithmic harmonic function and wavelet transform," Appl. Opt. 40, 4661-4666 (2001)

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