激光辐照条件下光学相机像质评价方法研究

Research on optical camera imaging quality evaluation method under the condition of laser irradiation

倾斜刃边像分析法是调制传递函数评价方法中最常用的方法之一,该方法成像过程中光束透过能量高、实用性强,具有广泛的应用前景。将倾斜刃边像分析法应用于激光辐照条件下相机成像质量评价系统,分析方法可信有效,但需综合考虑刃边倾角度、刃边两侧灰度对比度和背景噪声等影响因素。采用倾斜刃边像分析法计算不同功率密度和光斑位置下系统不同的MTF曲线和MTFA值,结果表明:当激光功率密度偏小或光斑位置距刃边较远时,刃边对比度和MTF值影响较小;当激光功率密度逐步增大或光斑位置向刃边靠近时,局部MTF呈降低趋势变化,刃边对比度和MTF值影响逐渐增大,干扰效果也逐渐明显,尤其是在光斑覆盖目标时,MTF值无法计算,干扰效果达到最佳。因此,基于倾斜刃边像分析法可实现定性和定量评价光学相机成像质量。基于该仿真结果,建立相应的激光辐照条件下光学相机成像质量测评系统,可为光学相机激光辐照效应实验及其激光干扰效果评估提供技术支持。

Slanted-edge imaging quality analysis method is one of the most commonly used methods in the evaluation of modulation transfer function(MTF).This imaging process method has broad application prospect because of its high beam transmission energy and strong practicability.The application of slanted-edge imaging quality analysis method to the camera imaging quality evaluation system under laser irradiation is credible and effective.However,the factors such as edge inclination angle,gray contrast on both sides of edge and background noise should be considered comprehensively.The MTF curves and modulation transfer function amplitude(MTFA)values of the system under different power densities and spot positions are calculated by the slanted-edge imaging quality analysis method.The results indicate that when the laser power density is low or the spot position is far from the edge,the influences of the edge contrast and the MTF value are weak.With the increase of laser power density or the spot position is close to the edge,the local MTF value decreases,the influences of the edge contrast and the MTF value gradually increase,and the interference effect is obvious gradually.Especially when the spot covers the target,the MTF value cannot be calculated,and the interference effect is the best.Therefore,the imaging quality of optical cameras can be evaluated qualitatively and quantitatively based on the slanted-edge imaging quality analysis method.Based on the simulation results,establishment of an imaging quality evaluation system of optical camera under laser irradiation can provide technical support for laser irradiation effect experiment and laser jamming effect evaluation of optical camera.