CODEWITHSUNDEEP
pythonpython-3.xopencvtypeerror
3NiGMa
3NiGMa

Reputation: 545

Mat is not a numerical tuple openCV 2

I am relatively new to python and to openCV, I am trying to create a program that grabs input from my Macs' webcam and displays it in a window, and ultimately can process and edit these frames. Here is my code:

import cv2
import numpy as nmp
capture=cv2.VideoCapture(0)

while True:
    frame = capture.read()
    cv2.imshow("Webcam", frame)
    if (cv2.waitKey(0)):
        break

cv2.release()
cv2.destroyAllWindows()

my light near my webcam turns on but then the program stops with the following error

Traceback (most recent call last):
  File "/Users/spinder/Desktop/WebCam.py", line 7, in <module>
    cv2.imshow("Webcam", frame)
TypeError: mat is not a numerical tuple

there are similar questions in here but they do not fix my problem, any advice, fix or workaround would be greatly appreciated.

Upvotes: 0

Views: 2894

Answers (1)

eyllanesc
eyllanesc

Reputation: 243947

According to the docs:

Python: cv2.VideoCapture.read([image]) → retval, image

This returns 2 values, the first indicates if the frame is obtained correctly and the second is the frame. So in your case the code should be as follows:

import cv2
import numpy as nmp

capture=cv2.VideoCapture(0)

while True:
    res, frame = capture.read()
    if res:
        cv2.imshow("Webcam", frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

capture.release()
cv2.destroyAllWindows()

Upvotes: 1

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