least square regression method was used for mtf curve (at logarithmic axis) fitting with quadratic equation so as or cubic equation to obtain the desired parameters.
用最小二乘法对mtf曲线(对数坐标下)进行二、三次项拟合,求得拟合参数。
results to compare with normal persons, mtf curve was obvious abnormal.
结果正常人记录对照发现,mtf曲线明显异常。
an exponent adjusting method of mtf curve is presented to adjust the mtf compensation degree.
为了能够调节频谱拉伸的程度,还给出了一种指数调节mtf曲线的方法。