基于Wollaston棱镜阵列的目标识别系统

针对传统目标识别方法识别率低、受背景环境影响大等问题,设计了一种基于Wollaston棱镜阵列的偏振光谱成像系统.为了有效地探测野外目标的微弱信号,采用了高光通量的光学天线、偏振模块及干涉模块的设计.为了保证实时采集及高稳定性的设计要求,采用了全静态光学器件完成偏振分光及空间光程调制.系统由偏振成像模块与光谱成像模块构成,可实现同一视场内4个偏振方向图像及光谱图像的同时采集,并经图像融合算法重建被测区域的偏振光谱图像.实验在不同测试距离上分别以钢板和某型火炮作为被测目标,分别采用本系统偏振模块与传统非偏振系统进行测试.实验结果显示,偏振目标识别信噪比高、受距离影响小.基于此实验,再将偏振识别图像与光谱识别图像相融合,从而构成偏振光谱图像.与传统目标识别图像相比较,本系统合成图像中目标清晰可见,受背景环境影响小、可探测距离远,具有很高的野外适应性及稳定性.

Based on Wollaston Prism Array Polarization Spectroscopy Target Identification System

The main disadvantages of traditional target recognition methods are:low recognition rate,easily interference by the environment,non-real time and so on.In order to improve the ability to identify the target,based on Wollaston prism array polarization spectrum imaging system was designed.In order to effectively detect a weak signal field goal,a high flux of optical antenna,polarization modules and interference module were used for the system.In order to meet requirements for real-time acquisition and high stability,the fully static optics devices were used for polarization module and interference modulation.The system consists of polarization imaging module and spectral imaging module.Polarization Images of 4 directions and spectrum image can be collected simultaneously,and polarized spectrum image was rebuilt by image fusion algorithm in measurement region.In the experiment,plates and a certain type of gun was used as the test target at different test distance,the polarization module of the system was compare with conventional non-polarized system.Experimental results show that the signal to noise ratio(SNR)of the polarization target identification system is high,and the affected by the distance is small.Based on this experiment,polarization identification image and spectrum identification image was fused,to constitute polarization spectrum image.Compared with conventional object recognition image,the composite image of target is clearly visible.It 's not easily affected by the environment,and its detection distance is very far away.It has high adaptability field and stability.