Experimental investigation of distortion range for synthetic discriminant function filter in optical correlator

Wenshen Hua; Rui Xue; Yong Zhang; XueJu Shen; Yongzhong Wang

doi:10.1117/12.576977

11 January 2005 Experimental investigation of distortion range for synthetic discriminant function filter in optical correlator

Wenshen Hua, Rui Xue, Yong Zhang, XueJu Shen, Yongzhong Wang

Author Affiliations +

Proceedings Volume 5642, Information Optics and Photonics Technology; (2005) https://doi.org/10.1117/12.576977
Event: Photonics Asia, 2004, Beijing, China

Abstract

Multiple synthetic discriminant function (SDF) filters has been verified to be a better strategy for distortion invariant optical pattern recognition, especially for the in-plane rotation invariant ones. However, how to select the training sets is very crucial for the filter’s validity. In this paper, referring to the Rayleigh criteria, the distortion tolerance of a single matched spatial filter (MSF) has been tested by using a digital-optical hybrid 4f correlation system. Experimental results are ±5° and ±8% for the rotation and scaling distortion tolerance, respectively. According to the results, an equal correlation peak phase-only SDF algorithm has been adopted to synthesize two SDF filters, in which the training set images have been correspondingly selected with 5° and 10° intervals. The SDF filter constructed with 10° interval training sets has demonstrated as good performance as that one with 5° interval, but with the advantage of reduction by half of the number of multiple SDF filters for 360° full-rotation, which indicated that the double of distortion tolerance selected as the interval of training images is more suitable for real-time correlator recognitions.

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Wenshen Hua, Rui Xue, Yong Zhang, XueJu Shen, and Yongzhong Wang "Experimental investigation of distortion range for synthetic discriminant function filter in optical correlator", Proc. SPIE 5642, Information Optics and Photonics Technology, (11 January 2005); https://doi.org/10.1117/12.576977

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KEYWORDS

Distortion

Image filtering

Tolerancing

Optical correlators

Optical filters

Composites

Spatial filters

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