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Proceedings Paper

An improved hybrid opto-digital joint transform correlator reducing the influence of defocus on image motion measurement
Author(s): Hui Zhao; Hongwei Yi; Jingxuan Wei; Xiaopeng Xie
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Paper Abstract

Joint transform correlator (JTC) is a highly efficient way to measure image motion and a hybrid opto-digital JTC (HODJTC) has been proposed by us in [CHIN. OPT. LETT., Vol. 8, No. 8]. Being different from the traditional JTC, only one optical Fourier transform is needed and the optically generated joint power spectrum (JPS) is used to compute the image motion in a digital way. Although a high measurement precision can be obtained through HODJTC, the defocus will counteract the final result. In this paper, the influence of defocus is analyzed and an improved HODJTC, whose sensitiveness to defocus is reduced, is proposed. By introducing randomly generated defocus, a series of cross-correlation peak images is obtained and a subsequent spatial averaging procedure is applied to these images to generate the final cross-peak image which is used to compute the defocus invariant motion value.

Paper Details

Date Published: 14 November 2014
PDF: 10 pages
Proc. SPIE 9273, Optoelectronic Imaging and Multimedia Technology III, 92731C (14 November 2014); doi: 10.1117/12.2064959
Show Author Affiliations
Hui Zhao, Xi'an Institute of Optics and Precision Mechanics (China)
Hongwei Yi, Xi'an Institute of Optics and Precision Mechanics (China)
Jingxuan Wei, Xidian Univ. (China)
Xiaopeng Xie, Inner Mongolia Univ. (China)

Published in SPIE Proceedings Vol. 9273:
Optoelectronic Imaging and Multimedia Technology III
Qionghai Dai; Tsutomu Shimura, Editor(s)

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