opencv python 图像预处理

img = cv.imread()
kernel = np.ones((5,5),np.uint8)
imgGray = cv.cvtColor(img,cv.COLOR_BGR2GRAY)
imgBlur = cv.GaussianBlur(imgGray,(7,7),1)
imgCanny = cv.Canny(imgBlur,100,100)
imgDialation = cv.dilate(imgCanny,kernel,iterations=1)
imgEroded = cv.erode(imgDialation,kernel,iterations=1)