基于光学相关的亚像元像移测量方法研究  

Research on the Measurement Method of the Sub-pixel Image Motion Based on Optical Correlator

作　　者：樊超[1] 易红伟[1] 陈浩锋[1] 王矫[1] 

机构地区：[1]中国科学院西安光学精密机械研究所,陕西西安710068

出　　处：《激光与红外》2007年第2期181-184,共4页Laser & Infrared

摘　　要：为了对高帧频采集的低信噪比图像进行亚像元配准,使用了光学联合变换相关的方法对相邻两帧图像进行相关运算,测量出相对像移量。给出了使用该方法测量像移的原理和离焦影响,并采用两种预处理方法对不同景物图像的亚像元像移进行了仿真测量。结果表明,通过对联合变换相关器的输入面采用拉普拉斯卷积核进行边缘提取,对功率谱采用均值进行二值化处理,亚像元像移的测量均方差小于0.2个像元,并且测量精度对离焦不敏感。The joint transform correlator（JTC） can provide sub-pixel registration accuracy for the images which were captured at high frame rate with poor SNR. The principle of this method was described, and the effect of the defocussing on the accuracy was analyzed. Two preprocessing methods were simulated to measure the image motion for two images with different scene. The results show that, the RMS accuracy of 0.2 pixel can be achieved, when the Laplacian convolution kernel is used in the input plane, and the power spectrum is binaried by mean value. Moreover, this method is insensitive to the defocusing.

关 键 词：光学相关 联合变换相关器 像移测量 离焦 

分 类 号：TN751[电子电信—电路与系统]