如何使用 OpenCV 同时从​​连接到 Raspberry Pi 3 的两个 USB 摄像头捕获和保存图像？

How to capture and save images from two USB cameras connected to a Raspberry Pi 3 simultaneously using OpenCV?

我想使用连接到 Raspberry Pi 3 的两个 USB 摄像头拍摄的一对上下立体图像，用于无人机。如何将同时拍摄的图像保存在 pi 上的文件夹中？这是我让两个摄像头在两个单独的 windows:

上工作的方法 
import cv2

frame0 = cv2.VideoCapture(1)
frame1 = cv2.VideoCapture(3)
while 1:

   ret0, img0 = frame0.read()
   ret1, img00 = frame1.read()
   img1 = cv2.resize(img0,(1280,720))                          #360,240
   img2 = cv2.resize(img00,(1280,720))
   if (frame0):
       cv2.imshow('img1',img1)
   if (frame1):
       cv2.imshow('img2',img2)

   k = cv2.waitKey(30) & 0xff
   if k == 27:
      break

frame0.release()
frame1.release()
cv2.destroyAllWindows()

每 7 秒将一组两张图像保存在与 .py 文件相同的目录中。

import cv2
import time

frames = 100
interval = 7

frame0 = cv2.VideoCapture(1)
frame0.release()
frame0 = cv2.VideoCapture(1)
frame1 = cv2.VideoCapture(3)
frame1.release()
frame1 = cv2.VideoCapture(3)
for i in range(frames):

   ret0, img0 = frame0.read()
   ret1, img00 = frame1.read()
   img1 = cv2.resize(img0,(1280,720))                          #360,240
   img2 = cv2.resize(img00,(1280,720))
   if (frame0):
       cv2.imwrite('./img_'+str(i).zfill(4)+'.jpg',img1)
   if (frame1):
       cv2.imwrite('./img2_'+str(i).zfill(4)+'.jpg',img2)

   time.sleep(interval)
   #k = cv2.waitKey(30) & 0xff
   #if k == 27:
    #  break

frame0.release()
frame1.release()
cv2.destroyAllWindows()