AttributeError: ‘NoneType’ object has no attribute ‘ravel’
import cv2 as cv
from matplotlib import pyplot as plt
import numpy as np
path = './water_bottle/main.jpg'
img = cv.imread(path, 0)
plt.hist(img.ravel(), 256, [0, 256])
plt.show()
- 可能原因
- 没有numpy这个库
- 没有引入
import numpy
或者import numpy as np
- path的路径中没有这张图片或者就是路径错误,img中没有对应的值