摘要
利用透镜的傅电叶变换性质,并采用电寻址液晶等关键器件,研制成功光电混合联合变换相关器,实现了对复杂背景目标的准实时探测和精确定位。相对于传统的4f系统,具有识别精度高、识别速度快等特点。由于从图像传感器采集到的运动目标图像信息含有各种畸变形式(如位移、旋转、比例等),使得运动目标实时自动识别与跟踪变得困难。提出了梅林(Mellin)变换的方法,对梅林变换的原理及算法进行了深入研究,并进行了光学实验,得到了较好的实验效果,解决了目标尺寸不变问题。作为实例,给出了高空拍摄的航空图片的实验结果。目标的大小是模极的150%,经梅林变换处理后得到了较强的相关输出,该算法在光电混合目标探测领域具有一定的实际应用意义。
Opto-electronic hybrid joint transform correlator is developed successfully utilizing the Fourier transform feature of lens and adopting key devices such as electrical addressed liquid crystal device （EALCD）, which can realize quasi-real-time detection and precise location of targets with cluttered background. Compared to 4f system, it has the advantages of high identification accuracy, fast recognition speed and so on. However, the image information of moving targets collected form image sensor contains various forms of distortion （such as displacement, rotation and scale, etc. ）, which makes it difficult to realize automatic real-time recognition and tracking of moving targets. In this paper, the method of Mellin transform is proposed. The theory and algorithm of Mellin transform are studied deeply and computer simulation experiments and optical experiments are also conducted with good results. This solved the problem of scale invariable. As an example, the experiment results of aerial images taken at high altitudet are given. The size of target is 150% of the template. Brighter correlation peaks are obtained after Mellin transform. The algorithm has strong pratical application significance in the field of opto-electronic hybrid target detection.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2009年第2期421-425,共5页
Chinese Journal of Lasers
基金
总装备部预研究局十一五(51317×××105)资助课题
关键词
傅里叶光学
联合变换相关器
梅林变换
尺寸不变
Fourier optics
joint transform correlator
Mellin transform
scale invariable
