CODEWITHSUNDEEP
pythonimageopencvimshow
user7374554
user7374554

Reputation:

error in function imshow with created image

I am working with opencv using python. I have problem with cv2.imshow(). I wrote this code : 

import numpy as np  
import cv2  
img=np.zeros((512,512),np.uint8)  
img=cv2.line(img,(0,0),(511,511),(255,0,0),5)  
while(True):  
    cv2.imshow('img',img)  
    if cv2.waitKey(1) & 0xFF==ord('q'):  
       break

I get this error : 

error: (-215) size.width>0 && size.height>0 in function imshow

I have tried cv2.imshow() without cv2.line() it works fine.
how to solve with cv2.line() , cv2.rectanlge() functions ?

Upvotes: 1

Views: 79

Answers (2)

Ken Y-N
Ken Y-N

Reputation: 15018

Looking at the docs:

Python: cv2.line(img, pt1, pt2, color[, thickness[, lineType[, shift]]]) → None

The return type is None, but you assign that to img. Just use:

cv2.line(img,(0,0),(511,511),(255,0,0),5)

This is the same for all cv2 functions.

Upvotes: 2

user8502296
user8502296

Reputation:

You don't need to do img = cv2.line.

The line will draw as long as you specify image in the first positional argument. Do this and see the difference.

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

Upvotes: 1

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