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Proceedings Paper

High-precision image motion measurement applied for space camera based on hybrid opto-digital joint transform correlator
Author(s): Hongwei Yi; Hui Zhao; Yingcai Li
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Paper Abstract

Hybrid opto-digital joint transform correlator (HODJTC) is effective for image motion measurement, but it is different from the traditional joint transform correlator (JTC) because it only has one process of optical Fourier transform and the intermediate joint power spectrum (JPS) is directly input to a digital unit to compute the image motion. In original HODJTC, the correlation image is obtained by using a global discrete Fourier transform operator. In fact, the location of cross-correlation peak corresponding to zero image motion is known and the maximum image shift can also be estimated. Thus, the local cross-correlation image can be directly obtained by adopting a local Fourier transform operator instead. With the pixel-level location of cross-correlation peak is obtained, the up-sampling technique is introduced to relocate the peak in even higher accuracy. Both the experiments and simulations demonstrate that the RMS (root-mean-square) error of motion determination can be controlled below 0.05 pixels, which is a very promising result for real application.

Paper Details

Date Published: 23 November 2011
PDF: 10 pages
Proc. SPIE 8006, MIPPR 2011: Remote Sensing Image Processing, Geographic Information Systems, and Other Applications, 80061X (23 November 2011); doi: 10.1117/12.900508
Show Author Affiliations
Hongwei Yi, Xi'an Institute of Optics and Precision Mechanics (China)
Hui Zhao, Xi'an Institute of Optics and Precision Mechanics (China)
State Key Lab. of Transient Optics and Photonics (China)
Yingcai Li, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 8006:
MIPPR 2011: Remote Sensing Image Processing, Geographic Information Systems, and Other Applications

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