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为有效评价凝视成像系统的性能,依据凝视红外成像系统对红外辐射信号的转换机理,建立了凝视红外成像系统信号响应模型;利用线性系统理论和采样理论对成像系统的传递函数进行了分析建模;借助于三维噪声模型表征了系统的噪声特性。以成像系统建模为基础,模拟生成不同尺寸、不同辐射温差的等边三角形方位靶标图像;针对不同刺激强度的三角形靶标仿真图像,统计观察者对靶标方向正确鉴别的概率,引入视觉心理测量函数———韦布尔(Weibull)函数拟合观察者鉴别概率数据,实现了三角方向鉴别阈值(TOD)曲线的预测。与实际测量结果进行比较,显示了此方法预测三角方向鉴别阈值曲线的合理性。
In order to effectively evaluate the performance of gaze imaging system, a signal response model of gaze infrared imaging system is established according to the mechanism of the conversion of the infrared radiation signal by the gaze infrared imaging system. The transfer function of the imaging system is modeled using linear system theory and sampling theory The noise characteristics of the system were characterized by means of three-dimensional noise model. Based on the imaging system modeling, an isometric triangle azimuth target image with different sizes and different radiative temperature differences was simulated. For triangular target simulation images with different stimulation intensities, the probability that the observer correctly identified the target direction was statistically analyzed, and the visual psychological measurement function --- Weibull function to fit the observer identification probability data, to achieve the triangular direction identification threshold (TOD) curve prediction. Compared with the actual measurement results, this method shows the rationality of this method in predicting the triangular direction identification threshold curve.