Ms. Mingchuan Tang Profile

Mingchuan Tang

at Soochow Univ

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Proceedings Article | 20 August 2013 Paper

Optical correlation recognition based on LCOS

Mingchuan Tang, Jianhong Wu

Proceedings Volume 8913, 89130F (2013) https://doi.org/10.1117/12.2032960

KEYWORDS: Optical correlators, Liquid crystal on silicon, Tolerancing, Image filtering, Optical filters, Detection and tracking algorithms, Signal to noise ratio, LCDs, Phase modulation, Target recognition

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Vander-Lugt correlator^[1] plays an important role in optical pattern recognition due to the characteristics of accurate positioning and high signal-to-noise ratio. The ideal Vander-Lugt correlator should have the ability of outputting strong and sharp correlation peak in allusion to the true target, in the existing Spatial Light Modulators^[2], Liquid Crystal On Silicon(LCOS) has been the most competitive candidate for the matched filter owing to the continuous phase modulation peculiarity. Allowing for the distortions of the target to be identified including rotations, scaling changes, perspective changes, which can severely impact the correlation recognition results, herein, we present a modified Vander-Lugt correlator based on the LCOS by means of applying an iterative algorithm to the design of the filter so that the correlator can invariant to the distortions while maintaining good performance. The results of numerical simulation demonstrate that the filter could get the similar recognition results for all the training images. And the experiment shows that the modified correlator achieves the 180° rotating tolerance significantly improving the recognition efficiency of the correlator.

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