采用Canny算法进行边缘检测。主要包括以下几个步骤：1、用高斯滤波器平滑图像。2、用一阶偏导的有限差分计算梯度的幅值和方向。3、对梯度幅值进行非极大值抑制。4、用双阈值算法检测和连接边缘。5、采用高斯平滑函数-Using the Canny edge detection algorithm. Include the following steps: 1, smooth image with a Gaussian filter. 2, first-order partial derivatives of finite-difference calculation of the magnitude and direction of the gradient. 3, the gradient amplitude, non-maxima suppression. 4, dual-threshold algorithm to detect and connect edge. 5 Gaussian smoothing function