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。

Ideal knife-edge image and real remote sensing images were selected as the original image, and a series of degraded images were obtained through applying a various of radiation and geometric resampling operation on these original images. Then the MTF (modulation transfer function) evaluation was performed using the original image and all of degeneration images based on slant edge method. Experiments show that, in evaluating MTF of the imaging system, proper radiation resampling operation can be performed on the image for the visual effect, which will not affect the imaging system MTF, but the geometric resampling can seriously affect the MTF of imaging system.