Comparing to the DCT(discrete cosine transform), the realizing of DWT(discrete wavelet transform) is more complex, so solving the fast calculating of DWT is vej-y significative to use widely DWT.

• 小波变换与离散余弦变换相比,运算复杂度高,如何解决小波变换的快速实现对小波变换的广泛应用具有重要的意义。