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import cv2
# Canny算子
def CannyFilter(img):
# 读取图像
src = img
########## Begin ##########
# 1. 高斯滤波
blur = cv2.GaussianBlur(src, (3, 3), 0)
# 2. 灰度转换
blur = cv2.cvtColor(blur, cv2.COLOR_BGR2GRAY)
# 3. 求x，y方向的Sobel算子
gradx = cv2.Sobel(blur, cv2.CV_16SC1, 1, 0)
grady = cv2.Sobel(blur, cv2.CV_16SC1, 0, 1)
# 4. 使用Canny函数处理图像，x,y分别是3求出来的梯度，低阈值50，高阈值150
edge_output = cv2.Canny(gradx, grady, 50, 150)
########## End ##########
return edge_output
