给出了在相干匹配滤波系统中利用Ce:KNSBN光折变晶体非线性特性实现图像边缘增强光学相关模式识别的理论分析和实验结果.实验中自相关峰半最大值宽度降低了75%,自相关峰与互相关峰的强度比增强了近一倍,自相关峰的边瓣强度和互相关峰的强度得到抑制,系统的信噪比和相关鉴别率得到显著提高.

The theoretical analysis and experimental results of real time edge enhanced optical correlation pattern recognition via a Ce∶KNSBN photorefractive crystal in the coherent matched filter system are given. The full width at half maximum (FWHM) of the auto correlation peak is decreased 75%. The intensity ratio of the auto correlation peak and the cross correlation peak increases nearly one time by the edge enhancement operation. The lobe and intensity of the auto correlation peak are obviously depressed. The enhancements of signal to noise ratio and discrimination capability of the system are achieved obviously.