[SOLVED] My raspberry pi camera does not return frames to opencv

Issue

I have a raspberry pi camera module 3 connected to raspberry pi. It is connected properly, since libcamera-still -o test.jpg works as intended. But when I try to capture a stream of frames, I get this error message error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'.

My code looks like this:

cap = cv2.VideoCpture(0)

while True:
   _, image = cap.read()
   cv2,imshow("video stream", image)
   if(cv2.waitkey(1) == ord("q")):
      break

cap.release()
cv2.destroyAllWindows()

I have tried what this post says: opencv - unable to capture frame from camera on raspberry pi but it did not help.

Solution

So, the solution that worked for me looks kinda like this(I am using picamera2 to capture the camera frames and cv2 to show those frames in a window):

picam2 = Picamera2()
picam2.start()
while True:
   image = picam2.capture_array()
   cv2.imshow("Frame", image)
   if(cv2.waitkey(1) == ord("q")):
      cv2.imwrite("test_frame.png", image)
      break

cv2.destroyAllWindows()

Answered By - Tom Blums

Answer Checked By - Gilberto Lyons (WPSolving Admin)