浑浊介质下的偏振差分关联成像研究

Polarization Difference Ghost Imaging in Turbid Medium

为提高浑浊介质下关联成像系统的成像质量,提出了一种基于直方图预处理的水下偏振差分关联成像方法。首先,通过偏振探测获取两个正交偏振方向的关联成像图像,然后,借助图像的灰度拉伸方法对重构图像进行预处理,最后,运用偏振差分算法得到目标图像。实验结果表明,所提方法可以改善浑浊水体下散射所造成的像质退化问题,增强图像细节,提高成像质量。利用重建图像的灰度直方图进行灰度统计分析表明,相比于现有偏振关联成像方法,该方法在水体介质浑浊浓度较高的情况下仍可以区分浑浊介质与目标。

To improve the imaging quality of ghost imaging systems in turbid media, we propose an underwater polarization difference ghost imaging method based on histogram preprocessing. Firstly, two images in orthogonal polarization directions are acquired by polarization detection. Then, the images are preprocessed by gray-scale stretching. Finally, the reconstructed image is obtained with the polarization difference algorithm. Experimental results show that proposed method can not only improve the image quality degraded by scattering in turbid media but also enhance image details. In addition, compared with the existing polarization ghost imaging method, the gray-scale statistical analysis using the gray-scale histograms of the reconstructed images shows that when the medium has a higher turbidity concentration, the proposed method can still distinguish the target from the turbid medium.