说明：  matlab 环境下的 二维小波变换（正和逆变换），用二维卷积实现的，其中有个子函数用于产生小波系数的（小波分解和小波重构的系数都有）！你自己也可以往里面加系数
(Matlab environment 2D wavelet transform (and inverse transform), with the realization of two-dimensional convolution. these subsystems function used to generate the wavelet coefficients (wavelet decomposition and reconstruction of wavelet coefficients have)! You can also hide factor! !)