中文说明：图像边缘是图像最基本的特征之一，是图像中灰度发生剧烈变化的像素点的集合，边缘检测效果将直接影响图像分析与识别。传统边缘检测算子对噪声较为敏感、边缘定位不够精确，使其在实际工程中应用较少。Canny于1986年提出Canny边缘检测算法，并获得了广泛应用。
English Description：
Image edge is one of the most basic features of an image, which is a collection of pixels whose gray level changes dramatically. The effect of edge detection will directly affect the image analysis and recognition. The traditional edge detection operator is sensitive to noise, and the edge location is not accurate enough, so it is seldom used in practical engineering. Canny proposed Canny edge detection algorithm in 1986, and has been widely used.