这个代码是基于论文“Saliency Detection via Graph-Based Manifold Ranking”下的程序源码，作者是Chuan Yang, Lihe Zhang, Huchuan Lu, Ming-Hsuan Yang, and Xiang Ruan

功能1：使用canny算子计算图像的二值边缘图

-The code is for paper "Saliency Detection via Graph-Based Manifold Ranking"

by Chuan Yang, Lihe Zhang, Huchuan Lu, Ming-Hsuan Yang, and Xiang Ruan

Procedures:

1. compute a binary edge map of the image using the canny method.