说明：  本代码是Gabor带通滤波器，f应该是滤波器的中心频率，即你的纹理的主频率，Segma1,Segma2是正态分布的标准方差，看你带通的需要了，值越大，通带越大。你可以通过试验进行调整。
(This code is Gabor bandpass filter, f should be the filter center frequency, that is your main frequency texture, Segma1, Segma2 is the normal distribution of standard deviation, look you need a band-pass, the greater the value, pass with the greater. You can adjust through trial.)