本文是关于小波变换的一篇文档，摘自于一位网络牛人所写的文章，讲解通俗易通。本人将其文章中的一些句式和公式做了规范，修正了一些不确切的表达，关键部分做了标记，希望能为初学者提供帮助。-This is a document about wavelet transform, which is taken from the article written by a　Network Bull . Easy to understand. The specification of sentences and formulas has been done in this document. The inaccurate expressions were revised, and the key parts were marked. Hope to provide help for beginners.