Simple Time-sharing Long Wave Infrared Polarization Imaging System
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摘要: 为了开展红外偏振成像技术研究工作，本文设计搭建了一个长波红外偏振成像系统，实现了目标分时成像。提出了一种改进的基于单像元非均匀性差分图像校正方法去除冷反射，基于Sobel边缘检测方法对图像进行配准，并对目标场景的偏振特性进行了分析。结果表明，设计搭建的系统能够获取目标场景的红外偏振信息，预处理后的图像能够满足实验需要，经过Stokes矢量方法得到的目标场景偏振图像边缘轮廓与细节信息更加丰富。为了进一步衡量实验系统的性能，对强度图像和偏振度图像进行了融合，融合后的图像与红外强度图像相比，图像评估质量得到明显提升，验证了实验系统的可行性。该技术在未来的复杂环境下提高目标探测效率具有应用价值。Abstract: To conduct research on infrared polarization imaging technology, this paper designs and builds a long-wave infrared polarization imaging system to achieve target time-sharing imaging. An improved differential image correction method based on single-pixel inhomogeneity was proposed to remove cold reflections; the image was registered using the Sobel edge detection method, and the polarization characteristics of the target scene were analyzed. The results demonstrate that the proposed system can obtain the infrared polarization information of the target scene, and the pre-processed image meets the requirements of the experiment. The edge contour and detailed information obtained by the Stokes vector method for the polarization image of the target scene are more abundant. To further measure the performance of the experimental system, the intensity and polarization degree images were fused. Compared with the infrared intensity image, the fused image has a significantly improved image evaluation quality, which verifies the feasibility of the experimental system. This technology can potentially improve target detection efficiency in complex environments in the future.
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Keywords:
- infrared /
- polarization imaging /
- image enhancement
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图 1 长波红外偏振成像冷反射现象
Figure 1. Cold reflection phenomenon of long wave infrared polarization imaging
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图 3 不同偏振方向的红外图像：(a1)、(a2)分别为偏振方向为0°和135°的红外图像；(b1)、(b2)为相对应的细节放大图
Figure 3. Infrared images of different polarization directions: (a1), (a2) are infrared images with polarization direction of 0° and 135° respectively; (b1) and (b2) are the enlarged images of corresponding details
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图 5 冷反射去除前后灰度值像素个数变化图
Figure 5. Changes of the number of gray pixels before and after cold reflection removal
表 1 长波红外偏振成像系统参数
Table 1 Parameters of long-wave infrared polarization imagingsystem
Parameter Value Camera size/mm
Resolution ratio pixel
Wavelength coverage/nm
Detection range/m
Polarizer size/mm
Extinction ratio224×179.5×430
640×512
7500-14000
< 8600
50×50
10000:1
下载: 导出CSV
表 2 图 9图像评估结果
Table 2 Evaluation results of image in Fig.9
Information
entropyStandard deviation Average gradient S0
DOLP
Fusion
Rate/%5.8460
5.9859
7.0347
20.3%59.2586
20.4295
35.9071
-39.4%3.0030
7.2133
7.5963
152.9%
下载: 导出CSV
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