八通道并行多光谱成像仪的辐射定标  

Radiometric calibration of eight-channel parallel multi-spectral imaging

作　　者：屈亮[1] 廖宁放[1] 董志刚[1] 杨奇开 吕航[1] 董淑雯[1] 

机构地区：[1]北京理工大学光电成像技术与系统教育部重点实验室,北京100081

出　　处：《光学技术》2014年第3期240-244,共5页Optical Technique

基　　金：国家科技支撑计划(2012BAK02B04);公安部重点研究计划(2010ZDYJBJLG006)

摘　　要：为了对八通道并行多光谱成像仪进行准确的辐射定标,介绍了多光谱成像仪的工作原理,分析了相机的辐射响应模型,根据八个通道以及窄带滤光片的光谱响应特性及实际应用要求,提出取每个相机的G通道输出作为定标通道。根据不同色温下积分球输出的光谱辐亮度和相机的曝光时间,测量并拟合出相应的八通道相机辐射特性曲线。实验结果表明该方法可以准确地得到被测目标的绝对光谱辐射亮度曲线,满足海洋表面多光谱数据的测量要求。In order to calibrate the eight-channel parallel multi-spectral imaging, the principle of the multi-spectral imaging is introduced. The radiation response of the camera is analyzed. Based on the eight channels and the characteris- tics of the narrowband filters, a method which takes the G channel output of each digital camera as calibration channel is proposed. Depending on the spectral radiance of the integrating sphere under different color temperatures and exposure time of the camera, the camera＇s radiation characteristic curve is fit. The results show that the method is accurate and valid. An accurate absolute spectral radiance output of the object is got. The eight channel multi-spectral imaging system＇s data processing requirements is met.

关 键 词：多光谱成像 海洋颜色 辐射定标 

分 类 号：TP731[自动化与计算机技术—检测技术与自动化装置]