使用 cv2.VideoCapture 降低 fps

Question

我的 FPB 低 ~5，我在不同的相机 logitech c270 和 logitech 9000 上检查了此代码，情况相同。

我完成了有关关闭右灯等的所有提示。

import urllib.request as urllib
import cv2
import numpy as np
import time

while True:

    # Use urllib to get the image and convert into a cv2 usable format
    cap = cv2.VideoCapture(0)

    width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
    hiegh = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))

    ret, frame = cap.read()


    # put the image on screen
    cv2.imshow('Webcam', frame)


    if cv2.waitKey(1) & 0xFF == 27:
        break

cap.release()        
cv2.destroyAllWindows()

我应该怎么做才能提高 FPS？

Answer 1

You need to move this line up, outside your acquisition loop:

 cap = cv2.VideoCapture(0)

It does a one-time only initialisation.