Using Usb Camera with Opencv Python

Question

I am developing a neural.network with python opencv. It works when I turn on the laptop's own camera. When I plug in an external usb camera, I don't get any response. Independent of the program, only if I write opencv camera opening codes, it hangs. The program does not close, it seems to be running, but nothing happens. Why could it be?

Opening usb camera for opencv python

My Source Code:

img_height = 128
img_width = 128

model = tf.keras.models.load_model("modelson.h5")

camera_id = 1
camera_width = 1920
camera_height = 1080
camera_frame_rate = 30
camera_fourcc = cv2.VideoWriter_fourcc(*"MJPG")

auto_percent = 0.2
auto_threshold = 127
auto_blur = 5

norm_alpha = 0
norm_beta = 255

Answer 1

The device index is just a number to determine which camera. Usually one camera will be connected (as in my case my camera id is 0). You can choose a second camera by changing camera id: 1 to camera id: 0 or camera id: 2 . Camera id can be changed to index 0 - 9.

hope this can help you