OpenCV Python不支持的数组类型错误

Question

我是Python的新手（但不是openCV的新手），我很确定所有内容都安装正确，我已经测试了一些程序并且似乎工作正常，但是当我想要在图像上绘图时，例如此代码取自Python openCV教程：

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
img = cv2.line(img,(0,0),(511,511),(255,0,0),5)
cv2.imshow('img',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

我收到以下错误：

OpenCV Error: Bad flag (parameter or structure field) (Unrecognized or unsupported array type) in cvGetMat, file /build/buildd/opencv-2.3.1/modules/core/src/array.cpp, line 2482
Traceback (most recent call last):
File "/home/dccv/rec 2.py", line 17, in <module>
cv2.imshow('img',img)
cv2.error: /build/buildd/opencv-2.3.1/modules/core/src/array.cpp:2482: error: (-206)
Unrecognized or unsupported array type in function cvGetMat

任何帮助将不胜感激，我在Windows和ubuntu上都得到了相同的错误。

Answer 1

line函数返回None，因此您尝试显示None。

修复（第6行）是不将img变量设置为返回值，而只是忽略返回值：

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('img',img)
cv2.waitKey(0)
cv2.destroyAllWindows()