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Proceedings Paper

Experimental investigation of distortion range for synthetic discriminant function filter in optical correlator
Author(s): Wenshen Hua; Rui Xue; Yong Zhang; XueJu Shen; Yongzhong Wang
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Paper 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.

Paper Details

Date Published: 11 January 2005
PDF: 8 pages
Proc. SPIE 5642, Information Optics and Photonics Technology, (11 January 2005); doi: 10.1117/12.576977
Show Author Affiliations
Wenshen Hua, Shijiazhuang Mechanical Engineering College (China)
Rui Xue, Shijiazhuang Mechanical Engineering College (China)
Yong Zhang, Shijiazhuang Mechanical Engineering College (China)
XueJu Shen, Shijiazhuang Mechanical Engineering College (China)
Yongzhong Wang, Shijiazhuang Mechanical Engineering College (China)

Published in SPIE Proceedings Vol. 5642:
Information Optics and Photonics Technology
Guoguang Mu; Francis T. S. Yu; Suganda Jutamulia, Editor(s)

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