边缘增强新方法及在联合变换相关器中的应用(英文)

A New Method for Edge Enhancement and Its Application to Joint Transform Correlator

基于耦合理论定义并推导出耦合增益系数g,分析耦合增益系数g随TL和r的变化.提出图像边缘增强的新光学系统,该系统利用背景信号增强边缘信号,具有高输出效率和高亮度的优点.设计并构建出该光学系统,并利用CCD获得手骨的边缘增强图像.论证了光相关原理,模拟边缘增强和非边缘增强字母E的三维相关分布,并比较了两种相关器的分辨率Iac和半高宽(FWHM).分析表明:边缘增强预处理能有效提高相关器的性能.

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.