一种实测红外图像波段拓展方法研究

A Method of Spectral Band Extension of Measured Infrared Images

红外图像获取是红外成像仿真中的关键环节。针对仿真应用中无法获得多波段红外数据的问题,提出了一种把实拍某波段红外图像拓展到其他波段的方法。首先,利用定标曲线将热像仪电平数据定标得到对应视点处的温度值,然后去除探测器效应和大气效应,得到目标自身的辐射值,由此反推出对应的温度值,再由此温度值计算得到想要拓展波段内的辐射值,最后量化为红外图像。给出了实测红外图像由3～5μm拓展到8～12μm和由8～12μm拓展到3～5μm的仿真结果。并从仿真数据和实测数据的统计特性验证了该方法的可靠性。

It is an essential step to obtain infrared images in infrared image simulation. Since it is hard to obtain the multispectral infrared images in the simulation, a new method, which extends the measured infrared image in one spectral band to another, is proposed. Firstly, the voltage data from the thermal Imager is calibrated to determine the temperature of the points in front of eyes using calibration curve. Secondly, detector effects and atmosphere effects are eliminated, and the radiation from the surface is calculated, then the temperature of the surface is obtained. Furthermore, the corresponding radiation in the desired spectral band is calculated from the surface temperature, and finally the radiation data is quantified and represented as an infrared image. The images in the 3-5 μm and 8- 12 μm band obtained by simulation from 8- 12 μm and 3-5 μm, respectively, are presented in this paper. And statistic comparisons of the simulated images with the measured images are made, which are good proofs to the reliability of the method.