Error: cv2.error: OpenCV(4.0.0) C:\projects\opencv-python\opencv\modules\highgui\src\window_w32.cpp:1230: error: (-215:Assertion failed) dst.data == (uchar*)dst_ptr in function 'cvShowImage'

[BhautikDonga]

Expected behaviour

to show the image .

Actual behaviour

give this error:
cv2.error: OpenCV(4.0.0) C:\projects\opencv-python\opencv\modules\highgui\src\window_w32.cpp:1230: error: (-215:Assertion failed) dst.data == (uchar*)dst_ptr in function 'cvShowImage'

Steps to reproduce

• example code:

  import cv2
  import numpy as np

  cap = cv2.VideoCapture(0)
  while True:
  _, frame = cap.read()
  laplacian = cv2.Laplacian(frame, cv2.CV_64F)
  sobelx = cv2.Sobel(frame, cv2.CV_64F, 1, 0, ksize=5)
  sobely = cv2.Sobel(frame, cv2.CV_64F, 0, 1, ksize=5)
  cv2.imshow('Original', frame)
  cv2.imshow('Laplacian', laplacian)
  cv2.imshow('Sobelx', sobelx)
  cv2.imshow('Sobely', sobely)
  k = cv2.waitKey(5) & 0xFF
  if (k==27):
  break

  cv2.destroyAllWindows()
  cap.release()

• operating system: Windows 10

• architecture (e.g. x86): x86

• opencv-python version: 4.0.0.21

[HiteshSangwan0567]

Use a different version of OpenCV. 3.4.4 would be equally good. The 4.0.0.21 has a bug which is not yet resolved.

[skvark]

Yes, OpenCV version 4.0.0 has a bug which causes this behaviour. I haven't been able to solve macOS build issues in this repository so I can't release 4.0.1 yet to PyPi.

[skvark]

For reference: opencv/opencv#13216

[parthi2929]

Hi @skvark any update? Me too badly need 4.0.1.

[skvark]

I haven't been able to fix the macOS builds yet. I'll have a look again during this week if I have some spare time. You can see the build status at Travis: https://travis-ci.org/skvark/opencv-python

[skvark]

Build issues have been solved and I will publish soon 4.0.1.

[santhoshBjeeffy]

Hi @skvark I am using opencv version 4.3.0.36 and still i am seeing the same issue.. can you please let me know if am missing something.

[skvark]

Please report your issue to the OpenCV repository with full example: https://github.com/opencv/opencv/issues.

I cannot fix OpenCV bugs here, this is just a build toolchain.