说明：  一篇利用小波理论实现数字图像边缘检测的方法的文章，可以实现多尺度多分辨率的边缘检测，其基本思想来源于金字塔算法，和传统算子相比有不少优势
(The use of wavelet theory to achieve a digital image edge detection method of the article, you can realize multi-scale multi-resolution edge detection, the basic idea comes from the pyramid algorithm, and traditional operator has many advantages compared to)