摘要
从实验和计算机模拟两方面讨论二值化联合变换相关器的最佳阈值选取原则 实验研究表明 ,不同阈值对二值化联合变换相关结果有着较大影响 ,阈值过高或过低都会使联合变换相关结果变差 也就是说 ,二值化联合变换相关器存在一个最佳阈值 计算机模拟结果表明 ,最佳阈值位于联合变换功率谱的平均灰度值附近 在该阈值下 ,二值化联合变换相关器输出的相关峰值将相对提高 ,半宽度减小 。
The intensity of the correlation peaks output from a Joint Transform Correlator (JTC) can be relatively enhanced by binarizing the joint transform power spectrum nonlinearly. It is found in our experiment that the threshold magnitude has great influence on the correlation output of a binary joint transform correlator (BJTC). An excessive high or low threshold will weaken the correlation peaks. That is, there exists an optimal threshold for BJTC. The results of the computer simulation show that the optimal threshold should be the average gray of the joint transform power spectrum. With this optimal threshold the correlation peaks will be correspondingly enhanced and the half width will become narrower. Furthermore, the noise will be controlled.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2002年第9期1101-1105,共5页
Acta Photonica Sinica
