# Principle and Implementation of Stokes Vector Polarization Imaging Technology
## 4 Application of Stoker Vector Polarization Imaging  
Compared with traditional detection technology, polarization imaging technology has incomparable advantages in the following aspects: one is when the target use camouflage coatings, camouflage net technology in disguise, such as polarization imaging technology can break through the limitations of traditional detector, are more likely to find the goal; Second, when the target radiation is weak and the background radiation is strong, it becomes difficult for the traditional detector to clearly distinguish the characteristics of the target from the background, and it is easier to highlight the target by using polarization imaging technology. Third, in the atmospheric environment, polarization imaging technology can increase the detection range under the conditions of smoke and fog, and polarization information has better retention than intensity scattering information. With the increase in application demand and the rapid development of photoelectric technology, all Stokes polarization imaging technology has become a hot research topic at home and abroad, and a variety of all Stokes polarization imaging schemes based on Stokes vector have been proposed. The Stokes parameters obtained by these schemes have been increased from two to four, and the way of obtaining polarization graphs has been developed from successively acquiring four polarization graphs to simultaneously acquiring four polarization graphs at one time, which has gradually realized the detection of all polarization components and greatly improved the real-time performance. In military application, the earlier and more common monitoring method is to obtain the radiation spectrum of the object, that is, two-dimensional gray image. However, even two different objects can be camouflaged to make the radiation spectrum the same, but the polarization information can represent the inherent properties of the object and is independent of the spectral information. In the case of complex background and camouflaged targets, polarization imaging detection can enhance the recognition of the target, which is conducive to the detection of relatively hidden targets. The special polarization state (circular polarization state) of some substances in a specific direction is helpful for underwater submarine search and tracking [43,44]. In the field of remote sensing ground  
Figure 9: Structure of the split-focal plane polarization sensor IMX250 MZR. Right: Internal stress of a transparent ruler made visible by false color presentation of the polarization [42]. object detection, according to the basic principle that different substances have different polarization information, polarization detection can obtain the distribution information of vegetation, minerals and other substances on the Earth, providing more abundant data for geological investigation, mineral exploration and vegetation protection, etc., which is more active in the field of gas detection and sea surface detection [45,46]. Polarization imaging technology can be used to more clearly record the physical structure and distribution inside the clouds and determine whether there are clouds and oil stains on the sea surface [47,48]. In the biomedical field, polarization is used to obtain the polarization information of relevant tissues before and after lesions, which is helpful for the diagnosis of cancer, burn and other diseases [49,50]. Image defogging has been a hot topic in target detection and automatic recognition, which has attracted extensive attention of researchers. The polarization imaging of split focal plane based on Stokes vector proposed a new method to improve the quality of defogging images. [PERSON] et al. proposed a polarization defogging method based on image fusion and adaptive adjustment algorithm in 2021 [51].