摘要
MTF(调制传递函数)是反映卫星成像系统性能的重要参数。由于不易从遥感影像中获得理想的直线刃边地物靶标,监测中低分辨率在轨卫星MTF是一个困难的任务。在讨论了刃边法计算MTF的基础上,本文采用了多项式拟合弯曲刃边,Fermi函数逼近边缘扩展函数,模拟退火方法计算函数系数,和多次最小二乘方法减少拟合误差等技术。设计实现了基于弯曲刃边计算遥感影像MTF的方法;为中低分辨率卫星MTF在轨监测提供了有效的技术手段。
The Modulation Transfer Function （MTF） is an essential parameter in satellite imaging system. It is difficult to obtain a perfect beeline edge object from the remote sensing image, so how to measure the MTF for the mid-low spatial resolution satellite in orbit is a hard task. After discussion of the edge method, the techniques of fitting curve edge with polynomial, ap- proaching the edge spread function （ESF） by Fermi function, and calculating the function coefficients with simulated annealing algorithm are used in this work. The algorithm for computing MTF of remote sensing image with curve edge is designed, which provides an effective monitoring method of mid-low spatial resolution satellite in orbit.
出处
《遥感信息》
CSCD
2009年第3期3-6,共4页
Remote Sensing Information
