一种基于圆偏光的偏振去雾成像优化方法

在经典的偏振成像去雾方法中，后向散射光的偏振度估计值是影响去雾效果的关键。基于圆偏振光在米氏散射介质中良好的保偏特性，提出一种适用于强散射环境下的偏振成像去雾方法。研究不同偏振态的光源照明时，不同散射强度下，CCD接收到的光场偏振度变化规律，在此基础上提出了一种快速简易的散射光偏振度估计方法。该方法在不增加系统复杂度的情况下，提高了偏振成像去雾的效果。实验结果显示，在强散射条件下文中方法获得的去雾图像EME值比传统方法高20.4%。此外，该方法不需要传统偏振去雾方法中对背景区域的判断，降低了算法复杂度。

Optimization for a polarimetic dehazing imaging method based on the circularly polarized light

In a typical polarimetric dehazing method, the estimation of the degree of polarization (DoP) of the backward scattered light is a key factor to affect the dehazing effect. In the present paper, based on the polarization maintaining characteristic of the circularly polarized light in the Mie scatting media, the traditional polarimetric dehazing method was optimized which was suitable for use in the strong scattering environment. The variation patterns of the DoP of the light field received by the CCD, in the light source illuminations with different polarization states and in different densities of the scattering particles, were discussed, based on which a simple and easy method for estimating the DoP of the scattered light was proposed. This method can improve the effect of polarimetric dehazing method, without increasing the complexity of the system. It can be seen from the experiment results that under a condition of strong scattering, the present method can provide the dehazed images with an EME value being 20.4% higher than that by the traditional method. In addition, in this method, it is not necessary to determine the background region (s) as in the traditional method for polarimetric dehazing, thus lowering the calculation complexity.