I’m trying to capture an image from my Raspberry Pi camera module using OpenCV. The code runs without errors, but the frame I get is completely black.

When I use

`rpicam-still -o Desktop/image.jpg`,

I am able to get a still picture from the camera. However, when I run this code that I found on the internet (I’m not sure where I got it, but it’s a generic code that just tries to use OpenCV), I only get a completely black frame.

The code:

`   import numpy as np
import cv2 as cv

cap = cv.VideoCapture(0)
if not cap.isOpened():
    print("Cannot open camera")
    exit()
while True:
    # Capture frame-by-frame
    ret, frame = cap.read()
    # if frame is read correctly ret is True
    if not ret:
        print("Can't receive frame (stream end?). Exiting ...")
        break

    # Display the resulting frame
    cv.imshow('frame', frame)
    cv.waitKey()
    if cv.waitKey(1) == ord('q'):
        break

cap.release()
cv.destroyAllWindows()   `

Also, I’m running this in Thonny IDE, and I’m using a Raspberry Pi 3 (with Raspberry Pi OS 64-bit) with a RaspiCam module. I already checked the OpenCV installation, and everything seems to be fine, but I’ll include the versions of Python and OpenCV that I’m using:

`   pip show opencv-python
Name: opencv-python
Version: 4.10.0.84
Summary: Wrapper package for OpenCV python bindings.
Home-page: https://github.com/opencv/opencv-python
Author: 
Author-email: 
License: Apache 2.0

python3 --version
Python 3.11.2   `

(This is my first time posting here, and English is not my native language, so let me know if you have any questions about my writing or the data I provided.)