能将频带分解为几个不同频率的信号，可以帮助程序员在做小波变换时使用-Band decomposition can be for several different frequency signal，Can help programmers to use when doing wavelet transform

基于小波的纹理特征，小波四层分解，特征向量含有均值、标准差、空间频率等，共13*4个特征。-Based on texture feature of wavelet, wavelet decomposition, four layers of characteristic vector containing the mean, standard deviation, such as spatial frequency, a total of 13* 4 characteristics.