多偏振方向对低照度伪装目标偏振度提取的影响

摘要

The DOLP expression of any polarizer direction was deduced based on the Stokes vector and Mueller ma-trix. The polarization detection experiments of camouflage target under multi －polarization directions was done,and taking camouflage man－material polarization reflection experiment as the data,the experiment results were discussed by numerical calculation,and then the influence of multi－polarization directions on the stability and error of DOLP was discussed. The experimental results show that image definition and contrast of interval 60 °in reflection direction are high under the condition of low illumination. The numerical results can reasonably explain the experimental results and show good consistency. Research further finds that three polarization direction angles A,B,C and its intensities are a composite DOLP image,when interval angle ΦAB∈[40°,80°]is between A and B,and average interval angle ΦAC＝2. 06 ΦAB is between B and C,the stability and error of DOLP image is significantly reduced.%基于Stokes矢量和Mueller矩阵,推导了任意偏振方向的线偏振度表达式,实施了多偏振方向的低照度伪装目标偏振检测实验,以多种伪装相关的人材料三波段偏振反射实验数据为依据,采用数值计算方法讨论了上述实验结果,探讨了多偏振方向影响偏振度的误差和稳定性问题.研究表明,探测角在镜面反射方向附近,间隔60°的偏振度图像的清晰度和对比度较高,数值计算结果能合理地解释实验结果,一致性较好;发现当三个偏振方向角A、B、C之间的间隔角度ΦAB∈[40°,80°]和ΦAC平均值为2. 06ΦAB时,偏振度标准差较小,低照度条件下获取的偏振信息较稳定.