My goal is to be able to capture an image using a Logitech hd C270 wencam on Ubuntu 20.04 using OpenCV but I’m encountering a problem that I don’t understand.

Hello,

My goal is to be able to capture an image using a Logitech hd C270 wencam on Ubuntu 20.04 using OpenCV but I’m encountering a problem that I don’t understand.

Here is my program :

`import cv2

def capture_image(device_path, ouput) : 
    cap = cv2.VideoCapture(device_path)

    if not cap.isOpened():
        print("Error open the device")
        return 
    
    ret, frame = cap.read()
    print(ret)
    print(frame)
    if not ret:
        print("Error capture image")
        return
    
    cv2.imwrite(ouput, frame)

    cap.release

    print("imahe capturée")

if __name__ == "__main__":
    device_path = "/dev/video0"
    ouput = "image.jpg"   
    capture_image(device_path, ouput) `

when I launch my program
ret is False and
frame is None

This is my OS
Linux nahel-VirtualBox 5.15.0-105-generic #115~20.04.1-Ubuntu SMP Mon Apr 15 17:33:04 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

nahel@nahel-VirtualBox:/$ v4l2-ctl –list-device
C270 HD WEBCAM (usb-0000:00:06.0-2):
/dev/video0
/dev/video1

nahel@nahel-VirtualBox:/$ v4l2-ctl -V
Format Video Capture:
Width/Height : 640/480
Pixel Format : ‘YUYV’ (YUYV 4:2:2)
Field : None
Bytes per Line : 1280
Size Image : 614400
Colorspace : sRGB
Transfer Function : Rec. 709
YCbCr/HSV Encoding: ITU-R 601
Quantization : Default (maps to Limited Range)
Flags :

nahel@nahel-VirtualBox:/$ v4l2-ctl –list-formats
ioctl: VIDIOC_ENUM_FMT
Type: Video Capture

I tried my code on Windows and it worked