我认为我的代码是正确的但它无法与 opencv 一起使用，我试图让我的相机

Question

import cv2

vid=cv2.VideoCapture(0)

while True:
    ret,frame=vid.read()
    cv2.imshow('frame',frame)

    vid.release()
    cv2.destroyAllWindows()

error: (-215:Assertion failed) !_src.empty() in
function 'cv::cvtColor'

Answer 1

Every time you loop this line of code, the loop starts the camera and stops the camera:

vid.release()
cv2.destroyAllWindows()

You should try this code:

import cv2
cap = cv2.VideoCapture()
# The device number might be 0 or 1 depending on the device and the webcam
cap.open(1, cv2.CAP_DSHOW)
while(True):
    ret, frame = cap.read()
    cv2.imshow('frame', frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
cap.release()
cv2.destroyAllWindows()