A New Method for Edge Enhancement and Its Application to Joint Transform Correlator
边缘增强新方法及在联合变换相关器中的应用

The coupling gain coefficient g was defined and deduced based on coupling theory, and the variant of coupling gain coefficient g for different TL and r was analyzed. A new optical system was proposed for image edge-enhancement. The back signal was used to amplify the edge signal,which has the advantages of high throughput efficiency and brightness. The optical system was designed and built, and the edge-enhanced image of hand bone was captured electronically by CCD camera. The principle of optical correlation was demonstrated, 3-D correlation distribution of letter E with and without edge-enhancement was simulated, and the discrimination capability Iac and the full-width at half maximum intensity (FWHM) were compared for two kinds of correlators. The analysis shows that edge-enhancement preprocessing can improve the performance of correlator effectively.