如何更改帧分辨率opencv python

import cv2

cap = cv2.VideoCapture(0)  # 打开默认摄像头

while True:
    ret, frame = cap.read()  # 读取一帧图像
    if not ret:
        break

new_width = 640  # 新的宽度
new_height = 480  # 新的高度
resized_frame = cv2.resize(frame, (new_width, new_height))

cv2.imshow('Resized Frame', resized_frame)

if cv2.waitKey(1) & 0xFF == ord('q'):
    break

cap.release()

cv2.destroyAllWindows()