IPython笔记本中的Python OpenCV错误

我在IPython笔记本中运行此代码时出错。 我的代码：

错误：

error                                     Traceback (most recent call last)
<ipython-input-12-dc7e5a608b64> in <module>()
      6 # Draw a diagonal blue line with thickness of 5 px
      7 img = cv2.line(img,(0,0),(511,511),(255,0,0),5)
----> 8 cv2.imshow('image',img)
      9 cv2.waitKey(0)

error: ..\..\..\modules\highgui\src\window.cpp:261: error: (-215) size.width>0 && size.height>0 in function cv::imshow

您使用cv2.line函数的输出重新分配img数组，但是 根据统计，它的产量是零

此版本将为您提供所需的结果：

import numpy as np
import cv2
# Create a black image
img = np.zeros((512,512,3), np.uint8)
# Draw a diagonal blue line with thickness of 5 px
cv2.line(img,(0,0),(511,511),(255,0,0),5)
cv2.imshow('image',img)
cv2.waitKey(0)

import numpy as np
import cv2
# Create a black image
img = np.zeros((512,512,3), np.uint8)
# Draw a diagonal blue line with thickness of 5 px
cv2.line(img,(0,0),(511,511),(255,0,0),5)
cv2.imshow('image',img)
cv2.waitKey(0)