计算十字叉丝的在不同距离的衍射图像,计算晶粒的生长，入门级别程序,FIR 底通和带通滤波器和IIR 底通和带通滤波器。- Calculation crosshairs diffraction image at different distances, Calculation of growth, entry-level program grains Bottom-pass and band-pass FIR and IIR filter bottom pass and band-pass fil