<unknown> is not a numpy array error

Question

I am trying to apply threshold to an image, but I get the following error :

TypeError: 'unknown' is not a numpy array

I get this error on the cv2.imshow() line.

Here is my code :

import cv2
import numpy as np
img = cv2.imread('...',0)
img2 = cv2.imread('...',0)
fImg = cv2.addWeighted(img.astype(np.float32), 0.9, img2.astype(np.float32), 0.1, -20.0)
th = cv2.threshold(fImg, 127, 255, cv2.TRESH_BINARY)
cv2.imshow('th', th)
cv2.waitKey(0)
cv2.destroyAllWindows

Thanks in advance for your help !

Abhijit · Accepted Answer · 2014-07-14 17:16:14Z

4

cv2.threshold returns a tuple (retval, dst), where dst is the transformed matrix. You need to pass dst to cv2.imshow instead of the returned tupled, after checking if retval is valid

retval, th = cv2.threshold(fImg, 127, 255, cv2.TRESH_BINARY)
if retval:
    cv2.imshow('th', th)

answered Jul 14, 2014 at 17:16

Abhijit

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