High-precision image motion measurement applied for space camera based on hybrid opto-digital joint transform correlator

Hongwei Yi; Hui Zhao; Yingcai Li

doi:10.1117/12.900508

23 November 2011 High-precision image motion measurement applied for space camera based on hybrid opto-digital joint transform correlator

Hongwei Yi, Hui Zhao, Yingcai Li

Author Affiliations +

Proceedings Volume 8006, MIPPR 2011: Remote Sensing Image Processing, Geographic Information Systems, and Other Applications; 80061X (2011) https://doi.org/10.1117/12.900508
Event: Seventh International Symposium on Multispectral Image Processing and Pattern Recognition (MIPPR2011), 2011, Guilin, China

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.

Citation Download Citation

Hongwei Yi, Hui Zhao, and Yingcai Li "High-precision image motion measurement applied for space camera based on hybrid opto-digital joint transform correlator", Proc. SPIE 8006, MIPPR 2011: Remote Sensing Image Processing, Geographic Information Systems, and Other Applications, 80061X (23 November 2011); https://doi.org/10.1117/12.900508

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