用于完成小波变换的函数，这个函数与matlab自带的函数不同之处在于它可以返回矩阵，而不是一个行向量-wavelet transform for the completion of the function, Matlab functions and the built-in function of the difference between lies in the fact that it can return to the matrix and vector is not a trip

基于matlab的DWT函数，供信号与图像处理学习研究者参考。-Matlab function based on the DWT for signal and image processing study researchers.

function in platform to use this method discrete wavelet transform