cv2.imshow() 函数在我调用它时没有显示任何内容

Question

I'm following one of the openCV python tutorials on displaying a live video feed from your camera. When I run the program, the green light for the webcam comes on (as I'm on a Mac) and there aren't any errors. Theres also a python rocketship thing that comes up in my dock, but it doesn't show any windows or anything. This also happens when I try and display one image.

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

while(True):
    # Capture frame-by-frame
    ret, frame = cap.read()

    # Our operations on the frame come here
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    # Display the resulting frame
    cv2.imshow('frame',gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# When everything done, release the capture
cap.release()
cv2.destroyAllWindows()

This is the code I'm using. Any help would be much appreciated. Thanks

Answer 1

Try to use cv.named Window command to open a new window :

cv2.namedWindow('frame', cv2.WINDOW_AUTOSIZE)
cv2.imshow('frame',gray)
cv2.WaitKey(1)
cv2.destroyAllWindows()

I hope this works well with you

Answer 2

I found a solution in here . Try adding below line on top.

import cv2.
cv2.startWindowThread()

And inside for loop run this.

cv2.namedWindow("frame")
cv2.imshow('frame',gray)
if cv2.waitKey(1) & 0xFF == ord('q'):
    break