水下目标物偏振成像特性研究
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摘要
偏振图像比传统强度图像包含更丰富的物体表面反射及散射信息。用萨尔萨(SALSA)相机在自然光照下获取水下偏振图像,研究不同材质物体、放置深度、牛奶浓度及波段因素对水下目标物偏振成像的影响。结果表明:蓝色波段偏振成像能够较好地获取水下物体的边界轮廓等信息;不同材质的目标物在水下呈现不同的偏振特性,紫铜偏振度最高达0.69;在1.40mg/L牛奶浑浊度的水下,偏振图像仍能通过比较目标物的偏振度(degree of polarization,DOP)信息来检测出水下目标物,瓷片的DOP仅降低0.31;此外,在水下约40cm深度下,偏振成像获取的图像比强度图像轮廓更为清晰,如铁的偏振对比度比强度对比度高5.26%。
Compared with the traditional intensity image,the polarization image contains more abundant information of the reflection and scattering of the object surface.The underwater polarizing image was acquired by SALSA camera under natural illumination.The influence of underwater objects,depth,milk concentration and detection band on polarization imaging detection was studied.The results show that in the blue band,the polarization imaging can obtain better information of the boundary contour of the underwater object.The objects of different materials present different polarization characteristics under the water,and the copper has the highest degree of polarization 0.69.Under the condition of milk turbidity 1.40 mg/L,the polarization image can still detect the underwater target by comparing the target object's degree of polarization(DOP)information,the DOP of porcelain only reduces by 0.31.In addition,The image obtained by polarizing imaging is clearer than the intensity image at the depth of about 40 cm underwater.For example,the polarization contrast of iron is 5.26% higher than that of intensity.
Compared with the traditional intensity image,the polarization image contains more abundant information of the reflection and scattering of the object surface.The underwater polarizing image was acquired by SALSA camera under natural illumination.The influence of underwater objects,depth,milk concentration and detection band on polarization imaging detection was studied.The results show that in the blue band,the polarization imaging can obtain better information of the boundary contour of the underwater object.The objects of different materials present different polarization characteristics under the water,and the copper has the highest degree of polarization 0.69.Under the condition of milk turbidity 1.40 mg/L,the polarization image can still detect the underwater target by comparing the target object's degree of polarization(DOP)information,the DOP of porcelain only reduces by 0.31.In addition,The image obtained by polarizing imaging is clearer than the intensity image at the depth of about 40 cm underwater.For example,the polarization contrast of iron is 5.26% higher than that of intensity.
引文
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[9]HUANG Bingjing,LIU Tiegen,HU Haofeng.Un-derwater image recovery considering polarizationeffects of objects[J].Optics Express,2016,24(9):9826-9838.
[10]SABBAH S,LERNER A,ERLICK C.Under waterpolarization vision-aphysical examination[C]:NewYork:Final Report,2005,123-176.
[2]QIN Lin,CHEN Mingsong,QUE Feiyi.Investiga-tion of underwater polarization image system basedon range-gated techniques[J].Electronic Design En-gineering,2011,19(7):184-186.秦琳,陈名松,阙斐一.基于距离选通的水下偏振光成像系统的研究[J].电子设计工程,2011,19(7):184-186.
[3]ZHAO Hongyang, YAO Wenqing. Polarization-based depth information acquision of underwater tar-get[J].Electronics &Control.2015,22(8):43-47.赵泓扬,姚文卿.基于偏振的水下目标深度信息获取方法[J].电光与控制.2015,22(8):43-47.
[4]HAN Jiefei,XIA Min,SUN Liying,et al.Influenceof underwater targets with diferent polarization prop-erties on the resolution of imaging system[J].ActaOptica Sinica,2016,36(3):75-83.韩捷飞,夏珉,孙立颖,等.水下目标不同偏振特性对成像系统分辨率的影响[J].光学学报,2016,36(3):75-83.
[5]WANG Mahua,ZHAO Zhengmin,WANG Shihu,etal.Restoring method for underwater degraded imagesbased on improved turbulence model and polarizationimaging[J].Transactions of the Chinese Society ofAgricultural Engineering,2013,29(sup):203-209.王马华,赵正敏,王士湖,等.基于改进湍流模型和偏振成像技术的水下退化图像复原方法[J].农业工程学报,2013,29(增刊):203-209.
[6]GUAN Jinge,ZHU Jingping,TIAN Heng,et al.Real time polarization difference of underwater ima-ging based on Stokes vector[J].Acta Phys.Sin.,2015,64(22):224203-1-7.管今哥,朱京平,田恒,等.基于Stokes矢量的实时偏振差分水下成像研究[J].物理学报.2015,64(22):224203-1-7.
[7]LI Mingjie,LIU Xiaofei,ZHANG Yinghua.Re-search on feature fusion technology of laser underwa-ter polarization imaging[J].Laser Journal,2017,38(5):94-98.李明杰,刘小飞,张英华.激光水下偏振城乡的特征融合技术研究[J].激光杂志,2017,38(5):94-98.
[8]BAI Sike,DUAN Jin,LU Yizhuo,et al.Experi-mental study on polarization imaging characteristicsof various materials[J].Journal of Applied Optics,2016,37(4):510-516.白思克,段锦,鲁一倬,等.不同材质的偏振成像特性实验研究[J].应用光学.2016,37(4):510-516.
[9]HUANG Bingjing,LIU Tiegen,HU Haofeng.Un-derwater image recovery considering polarizationeffects of objects[J].Optics Express,2016,24(9):9826-9838.
[10]SABBAH S,LERNER A,ERLICK C.Under waterpolarization vision-aphysical examination[C]:NewYork:Final Report,2005,123-176.