基于对功率谱进行位相调制的联合变换相关器  

A Joint Transform Correlator Based on Phase Modulation of the Power Spectrum

作　　者：翟宏琛[1,2] 陈自宽[1,2] 张铁群 李海龙[1,2] 路明哲 康辉 战元龄[3] 朱秀山 

机构地区：[1]南开大学现代光学研究所 [2]国家教委光学信息技术科学开放实验室 [3]南开大学物理系

出　　处：《中国激光》1998年第2期139-144,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金;国家教委博士点基金

摘　　要：讨论了通过位相调制对多灰度图像进行功率谱相减的原理，并提出了利用此原理实现多灰度多目标光学联合变换相关的新的实验方法。其中需对功率谱进行两次记录并进行相减。在第二次的记录过程中，利用位相板使参考图像产生半波位相延迟。将相减后的功率谱进行傅里叶逆变换，能够使相关峰得到明显增强，而且大大抑制了多目标间的相关及背景噪声间的相关。此方法特别适用于具有多灰度背景噪声的多灰度的多目标识别，而且方法简单，易于实现。In this paper, the principle of power spectrum subtraction for images with multiple grey levels through the phase modulation is discussed. And, based on this principle, a new experimental solution of the optical joint transform correlation for multiple objects with multiple grey levels is presented. In this experimental solution, the power spectrum is recorded two times and followed by a subtraction of them. During the second recording, a phase plate is used to produce a half wave delay of the reference image. The subtracted power spectrum is used for reverted Fourier transformation, which results in enhanced correlation peaks and eliminates correlations between the objects and between the background noises. This method is specially suitable to the recognization of multiple objects with multiple grey levels and is easy to be implemented.

关 键 词：联合变换相关 位相调制 功率谱 JTC 图像识别 

分 类 号：TN761.3[电子电信—电路与系统] TP391.41[自动化与计算机技术—计算机应用技术]