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利用调制传递函数对动态成像质量做出评价,确立合理的稳定系统性能指标,是航空相机设计过程中需要解决的重要问题.基于线性光学系统的传递函数理论,针对匀速运动、加速运动和正弦运动等几种动态成像条件进行了定量分析,建立了像移量和动态成像质量之间的联系.针对低频正弦运动,提出了一种基于离散相位区间的动态调制传递函数计算方法.分析结果表明,在像模糊斑大小均为0.5个像元的情况下,高频正弦运动、直线运动和低频正弦运动的动态调制传递函数分别可以达到0.85、0.9和0.998,此时可以获得较理想的动态图像.据此得出了高频振动对像质的破坏最严重,直线运动次之,低频正弦运动最轻的结论.根据分析,可以针对特定的动态成像条件计算相应的调制传递函数,为航空相机系统的综合像质评价和视轴稳定系统设计提供了准确的定量参考.
The use of modulation transfer function to evaluate the dynamic imaging quality and establish a reasonable stable system performance index is an important problem to be solved in the design process of the aerial camera.According to the transfer function theory of linear optical system, for uniform motion, acceleration and sinusoidal motion And other several dynamic imaging conditions were quantitatively analyzed to establish the relationship between image shift and dynamic imaging quality.Aiming at the low-frequency sinusoidal motion, a dynamic modulation transfer function calculation method based on discrete phase intervals was proposed.The analysis results show that, When the size of fuzzy patches is 0.5 pixels, the dynamic modulation transfer functions of high frequency sinusoidal motion, linear motion and low frequency sinusoidal motion can reach 0.85, 0.9 and 0.998, respectively. At this time, the ideal dynamic image can be obtained. Based on this, we conclude that high-frequency vibration has the most serious damage to the image quality, followed by the linear motion and the lightest of the low-frequency sinusoidal motion.According to the analysis, we can calculate the corresponding modulation transfer function for the specific dynamic imaging conditions, The comprehensive image quality evaluation and boresight stabilization system design provide an accurate quantitative reference.