为什么 cv2.imshow() 在我的 python 编译器中导致错误？

Question

Hi friends i just now installed opencv and checking the basic code but it results in error. The code is

import numpy as np
import cv2
img=cv2.imread('C:\Users\Pravin\Desktop\a.jpeg',1)
cv2.namedWindow('img',cv2.WINDOW_NORMAL)
cv2.Waitkey(10000)
cv2.imshow('cv2.WINDOW_NORMAL',img)
cv2.destoryAllWindows()

The error for cv2.imshow() is

Traceback (most recent call last):
 File "<pyshell#3>", line 1, in <module>
cv2.imshow('image',img)
error: ..\..\..\src\opencv\modules\highgui\src\window.cpp:261: error: (-215)
size.width>0 && size.height>0

It was very helpful to me with your answer. Thanks in advance

Answer 1

Most likely, the imread call didn't succeed. Make sure the image "C:\\Users\\Pravin\\Desktop\\a.jpeg" exists. (The extension .jpeg seems unusual, maybe it has to be .jpg?)

Also, as Hyperboreus suggests, please, try using forward slashes in the filename "C:/Users/Pravin/Desktop/a.jpg", or escape backslashes

"C:\\Users\\Pravin\\Desktop\\a.jpg"

Answer 2

The error says that the image you opened doesn't satisfy the condition height > 0 and width > 0 . This may have several reasons.

Most of the times, it is due to an inexistent image address given in imread .

Sometimes it may be also because the complier failed to load the image. For example, if you write some random strings in notepad and save the file as a.jpg , the compiler may not be able to load it.

Answer 3

For me it worked when i just changed jpeg to jpg

Try this, may be it will work

import numpy as np
import cv2
img=cv2.imread('C:\Users\Pravin\Desktop\a.jpg',1)    #changed image format to jpg
cv2.namedWindow('img',cv2.WINDOW_NORMAL)
cv2.Waitkey(10000)
cv2.imshow('cv2.WINDOW_NORMAL',img)
cv2.destoryAllWindows()

Answer 4

Try this...

import numpy as np
import cv2
img = cv2.imread('E:/Images/ece/1.png',1)
cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

Answer 5

It is because, python compiler cannot find the image in the place. if you copy the image in the python working directory and do this. it worked for me.

    # keep image in the current working directory
    img=cv2.imread('roi.jpg',1) 
    cv2.imshow('image',img)