python图像处理问题AttributeError: 'NoneType' object has no attribute 'shape'

可能是因为没有设置路径，所以返回的类型是None。

改正的方法是，读取图片时把路径也写上

改正前

    #read an image
    img = cv2.imread('image.jpg')

    #print the dimension of the image
    print img.shape

改正后

#Try changing the direction of the slashes

im = cv2.imread("D:/testdata/some.tif",CV_LOAD_IMAGE_COLOR)

#or add r to the begining of the string

im = cv2.imread(r"D:\testdata\some.tif",CV_LOAD_IMAGE_COLOR)