Based on that , author applies a simple algorithm of restoration : counter - filter method , this algorithm is designed according to theory that the fourier transfer of two function ' s convolution is equal to multiply of two function ' s fourier transfer 在此基礎上,應用了一種簡明的復原算法:逆濾波器法,主要根據兩函數卷積的傅立葉變換等于各個函數傅立葉變換的乘積這一原理而設計。