opencv videocapture可以访问某些设备索引

Question

我想在Python中使用不同的网络摄像头拍摄一系列图像，将它们堆叠，然后将它们保存在每个相机的1到14个文件夹中。堆叠是一个过程，每个像素的每个像素都可以求和，然后到最后除以图片的数量。

这是我的代码：

import numpy as np
import time
from time import strftime, localtime, gmtime
import subprocess
import sys
import glob


def install(package):
    subprocess.check_call([sys.executable, "-m", "pip", "install", package])


install("opencv-python")
import cv2


###################### Camport Access #####################################################################################


def list_ports():
# Test the ports and returns a tuple with the available ports and the ones that are working.

is_working = True
dev_port = 0
working_ports = []
available_ports = []
while is_working:
    camera = cv2.VideoCapture(dev_port)
    if not camera.isOpened():
        is_working = False
        print("Port %s is not working." % dev_port)
    else:
        is_reading, img = camera.read()
        w = camera.get(3)
        h = camera.get(4)
        if is_reading:
            print("Port %s is working and reads images (%s x %s)" % (dev_port, h, w))
            working_ports.append(dev_port)
        else:
            print("Port %s for camera ( %s x %s) is present but does not reads." % (dev_port, h, w))
            available_ports.append(dev_port)
    dev_port += 1
return available_ports, working_ports


available, camports = list_ports()
print(camports)


picture_count = 5
hours = int(input("amount of hours: "))
minute = localtime().tm_min

for i in range(stunden):

     hour = localtime().tm_hour
     print("starting hour: ", i)

     for j in camports:
         cam_port = j
         print("currently taking images at camport: ", j + 1)
         cam = cv2.VideoCapture(cam_port, cv2.CAP_DSHOW)
         # take picture here and safe it
         Images = []
         timestr = time.strftime("%d.%m.%Y-%H_%M_%S")

         for k in range(picture_count):
             cam.set(cv2.CAP_PROP_AUTOFOCUS, 0)
             time.sleep(0.5)
             result, image = cam.read()
             if result:
                 Images.append(image)
                 img_sum = np.zeros(np.shape(image))  # Sum of images
                 img_cnt = np.full(image.shape, picture_count)

                 for img in Images:
                     img_sum = img_sum + img.astype(float)  # Sum images
                 avg_img = img_sum / img_cnt  # Divide sum by count, for computing the average.
                 avg_img = np.round(avg_img).astype(np.uint8)  # Round an cast to uint8
             else:
                 print("failure at: ", j + 1, k + 1)

         cv2.imwrite(f"path\\{j + 1}\\pic {i + 1} {timestr}.tiff", avg_img)
     print("waiting for the next hour")

     while localtime().tm_min is not minute or localtime().tm_hour == hour:
       time.sleep(1)

访问摄像头时我有问题。我使用的相机与我使用的相机无关，第4、6、8、10、12、12和14个营地无法正常工作，并给我传达了每张照片都失败的信息。 （请参阅“失败：”）。 您有一个想法如何解决吗？