Li Jin, Xing Fei, Sun Ting, You Zheng
Opt Express. 2015 Mar 9;23(5):6187-208. doi: 10.1364/OE.23.006187.
Modulation transfer function (MTF) can be used to evaluate the imaging performance of on-board optical remote sensing sensors, as well as recover and restore images to improve imaging quality. Laboratory measurement approaches for MTF have achieved high precision. However, they are not yet suitable for on-board measurement. In this paper, a new five-step approach to calculate MTF of space optical remote sensing sensors is proposed. First, a pixel motion model is used to extract the conditional sub-frame images. Second, a mathematical morphology algorithm and a correlation-homomorphic filter algorithm are used to eliminate noise and enhance sub-frame image. Third, an image partial differentiation determines the accurate position of edge points. Fourth, a model optical function is used to build a high-resolution edge spread function. Finally, MTF is calculated by derivation and Fourier transform. The experiment shows that the assessment method of MTF is superior to others.
调制传递函数（MTF）可用于评估机载光学遥感传感器的成像性能，以及对图像进行复原和恢复以提高成像质量。MTF的实验室测量方法已达到高精度。然而，它们尚不适用于机载测量。本文提出了一种计算空间光学遥感传感器MTF的新五步方法。首先，使用像素运动模型提取条件子帧图像。其次，采用数学形态学算法和相关同态滤波算法消除噪声并增强子帧图像。第三，通过图像偏微分确定边缘点的准确位置。第四，使用模型光学函数构建高分辨率边缘扩展函数。最后，通过求导和傅里叶变换计算MTF。实验表明，MTF的评估方法优于其他方法。
