此源代码用以实现二维离散小波变变换，一种基于mallat塔式算法 -This source code is used to achieve the two-dimensional discrete wavelet transform to transform a pyramid algorithm based mallat

用平面波展开法计算二维声子晶体带隙,关于非线性离散系统辨识，Gabor小波变换与PCA的人脸识别代码。- Computation Method D phononic bandgap plane wave, Nonlinear discrete system identification, Gabor wavelet transform and PCA face recognition code.