景深差分提取绿色植物的真彩色夜视图像颜色校正  

Color Correction of True-color Night Vision Image by Extracting Green Plants with Differential Depth of Field

作　　者：赵振芬 陈远金 张猛蛟 陈东启 王岭雪 蔡毅 ZHAO Zhenfen;CHEN Yuanjin;ZHANG Mengjiao;CHEN Dongqi;WANG Lingxue;CAI Yi(School of Optics and Photonics,Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems,Beijing Institute of Technology,Beijing 100081,China;East China Institute of Optoelectronic Integrated Device,Suzhou 215163,China;China Research and Development Academy of Machinery Equipment,Beijing 100089,China)

机构地区：[1]北京理工大学光电学院纳米光子学与超精密光电系统北京市重点实验室,北京100081 [2]华东光电集成器件研究所,江苏苏州215163 [3]中国兵器科学研究院,北京100089

出　　处：《红外技术》2020年第9期886-892,共7页Infrared Technology

摘　　要：近红外辐射是夜天光的重要成分,充分利用近红外辐射是提高真彩色夜视成像系统信噪比的有效手段。然而,对近红外辐射反射率高的绿色植物在真彩色夜视图像中存在偏色严重的问题。本文分析了红、绿、蓝通道中绿色植物图像的灰度值分布后发现:①绿色植物区域的景深大;②全通通道和红色通道的差值为不含近红外辐射的绿、蓝分量之和,且绿色植物区域在差分图像中的绿、蓝分量很小。本文基于这两个特点提出一种景深差分提取绿色植物的方法,之后根据色彩平衡原理利用所提取的绿色植物区域去调整红色通道和蓝色通道的值。结果表明:该方法能够有效校正近红外辐射对图像色彩的影响,还原绿色植物图像的色彩。Near-infrared radiation is an important component of night sky light.Making optimal use of near-infrared radiation is an effective method to improve the signal-to-noise ratio of true-color night vision imaging systems.However,green plants with high reflectance of near-infrared radiation introduce a strong color cast problem in true-color night vision images.In this study,we analyze the gray value distribution of green plant images in red,green,and blue channels and find that the depth of field of the green plant area is large.The difference between the all-pass channel and the red channel is the sum of the green and blue components,without the near-infrared radiation.In addition,the green and blue components of the green plant region are few in the difference image.Based on these two characteristics,in this study,we propose a color correction method for true-color night vision images.The method extracts green plants with differential depth of field,then uses the extracted green plant area to adjust the values of the red and blue channels,according to the color balance principle.The results show that the proposed method can effectively correct the influence of near-infrared radiation on image color and restore the image color of green plants in night vision images.

关 键 词：颜色校正 景深差分 提取绿色植物 色彩平衡 真彩色夜视 近红外 

分 类 号：TN223[电子电信—物理电子学]