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选取理想刃边图像和真实遥感图像作为原始图像,对其进行多种辐射和几何重采样操作,得到了一系列退化图像;用这些图像按照刃边法对成像系统的调制传递函数进行了估算。试验表明,采用刃边法估算成像系统的调制传递函数时,为了视觉效果,可以对图像进行适当的辐射重采样操作,基本不会影响成像系统的调制传递函数;而几何重采样则会严重影响成像系统的调制传递函数。
The ideal edge image and real remote sensing image are selected as the original image, and a series of degraded images are obtained through various radiation and geometric resampling operations. The modulation transfer function of the imaging system is estimated by these images according to the edge-edge method. Experiments show that when using the edge-to-edge method to estimate the modulation transfer function of an imaging system, an appropriate radiation resampling operation can be performed on the image for visual effects without substantially affecting the modulation transfer function of the imaging system. However, geometric re-sampling can seriously affect Modulation transfer function of imaging system.