提出一种基于采样红外成像系统仿真图像的最小可分辨温差MTRD预测方法.该方法从红外成像系统信号传递方程出发,模拟生成不同空间频率、辐射温度的标准四周期矩形样条;利用调制传递函数法和象素处理法,仿真了系统各组成模块的几何扭曲、模糊效应、噪声特性和非线性效应;由多名观察者观察样条仿真图像,统计正确判断概率,实现了MRTD的预测.仿真结果表明:该方法预测的MRTD值能够与实际测量的MRTD值有很好的一致性.

A method for predicting MRTD (Minimum Resolvable Temperature Difference) based on the sampled IR imaging system digital simulation was proposed. Standard four periodical rectangular patterns with typical spatial frequency and radiometric temperature were generated according to signal transfer equation. Then, system geometric distortion, blur effects, noise characters and nonlinear effects were simulated with modulation transfer function method and pixel processing method, respectively. Finally, MRTD prediction was accomplished according to the statistical discrimination of observers to simulated rectangular pattern. Simulation results show that there is a good agreement between MRTD prediction and MRTD experimental measure.