【摘要】 本文叙述调制传递函数 ( MTF)的基本概念 .介绍了闪光 X射线辐射照相屏 -片记录系统的调制传递函数的常用测量方法 .我们分别用矩形波光栅、台阶楔、针孔作输入激励 ,测出了高能闪光 X射线照相系统的调制传递函数 ,并对测量结果进行分析对比 .这些实测的MTF对成象系统成象性能的定量认识、照相条件的最佳选择、照相图象的事前预估、模糊图象的事后处理都有很重要的实用价值更多还原

【Abstract】 Modulation transfer function (MTF) is a very important concept in the field of image processing.In this paper three practical methods for measuring the MTF of flash X ray radiographic screen film system is presented.These methods are based on pin hole,step wedge and rectangle bar/space pattern as stimuli.The MTF results obtained with these techniques are applied to calculate the boundary distortion of certain test objects,choose optimum radiographic geometry and perform restoration processing of the blurred image.更多还原