Optical nonlinear correlation based on nonuniform subband decomposition

P. Garcia-Martinez*, C. Ferreira, D. Mendlovic

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present a nonlinear correlation to improve the selectivity for optical pattern recognition. The approach is based on morphological correlation which involves a threshold decomposition concept. Hereby, we propose a subband decomposition in the Fourier domain to perform the threshold decomposition operation. We consider two frequency bands that give rise to two separate channels. We apply the morphological correlation to each channel using a localized threshold decomposition. Then, we define a two-channel morphological correlation. The final detection decision is made as a combination of both correlation outputs. The two-channel morphological correlation yields improved discrimination capability and noise robustness compared with common linear and morphological correlation. Computer simulations are presented as well as optical experiments performed using a joint transform correlator.

Original languageEnglish
Pages (from-to)719-724
Number of pages6
JournalJournal of Optics A: Pure and Applied Optics
Volume1
Issue number6
DOIs
StatePublished - Nov 1999

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