偏振成像及其优化技术研究

Study of the Polarization Imaging and Optimization Technology

偏振成像技术中成像器件所接受到的曝光量以及成像器件的灵敏度都对图像的质量以及偏振信息的获取产生了关键性的影响。从成像器件所接受到的曝光量以及成像器件的灵敏度两个方面分别分析其对天空偏振信息获取的影响。在日照充足的晴朗天气下,器件很容易发生过曝,所以首先要采取减小曝光量的方法来进行成像。实验表明,将曝光量减小5倍,偏振信息的精确度可提高48%。其次通过控制灵敏度来控制器件对于光线的敏感程度。实验表明,灵敏度每降低一个等级,相似度就可以提高5%,并且在感光度为100时相似度可达到最大值,这时的测量精度最高可达70%左右。

The amount of exposure received by the imaging device and the sensitivity of the device all had crucial impacts to the image quality and the polarization information in the polarization imaging technology. We analyzed the influence to the sky polarization information when changed the amount of exposure and the sensitivity of the imaging device respectively. In the sunny weather day,device is easy to overexposure,so the approach to be first taken was to reduced the amount of exposure.Experiments show that when reduced the amount of exposure by 5 times,the accurate of polarization information can be increased 48%. Secondly,the device sensitivity was changed by controlling the ISO degree. Experiments show that when each ISO level is lower in one grade,the similarity can be increased 5%. And the similarity can be achieved the maximum when the ISO is 100,the measurement accuracy can be up to about 70%.