Research On Polarization Imaging With Linearly Polarized Light Illumination

As an effective means to obtain image target information,the original intensity image obtained in some special environments can not meet military investigation,remote sensing detection and traffic supervision and other needs.However,polarization imaging technology can solve this problem,which is one of the important means of target recognition at present.Therefore,it is of great significance to explore the principle of polarization imaging,the influencing factors and the enhancement scheme of polarization characteristics for breaking through the bottleneck of polarization detection technology and achieving more efficient target recognition.The common polarization measurement system belongs to passive imaging system,and its incident light is non polarized light source.In this paper,the way of active linearly polarization light source illuminating the target is considered for polarization imaging experiment.The main research contents are as follows:(1)A polarization imaging measurement system based on active linearly polarized light is built by using the method of rotating polarizer to obtain Stokes polarization parameters,and the accuracy of the system is verified.(2)In order to obtain higher quality polarization characteristic image,aiming at the polarization imaging measurement system based on active linearly polarization illumination,the influence factors of this system are explored from the types of incident light source,incident light intensity,incident angle,spectral width,and preprocessing of original intensity image,and the conclusion is verified by experiment.(3)In this dissertation,a polarization imaging and image fusion method of active orthogonal linearly polarized light is proposed,which uses orthogonal linearly polarized light to perform two polarization imaging on the measured object,and then fuses the two polarization images to obtain the enhanced polarization image,and then fuses the two original intensity images to obtain the enhanced intensity image,and then fuses the enhanced polarization image with the enhanced intensity image.Through two fusions,not only the whole target area can be obtained,but also the detailed features such as contour and texture can be improved.The experimental results show that the method has a significant improvement in subjective and objective evaluation index compared with the original polarization image and intensity image.