使摄像机帧捕捉动态并在同一窗口中实时连接输出

如何解决使摄像机帧捕捉动态并在同一窗口中实时连接输出

我正在尝试使捕获帧的主题动态化。也就是说，用户将输入摄像机的数量，每个摄像机将开始捕获相应的帧。每个摄像机的每个输出都显示在一个窗口中，我还想实现的是将所有这些窗口连接起来，并一个接一个地显示它们，直到屏幕末端，一旦到达末端，就继续在行中连接它们下面就像形成一个窗口阵列。

下面，我附上我所测试的代码段，该代码段可以在其中工作，但最多只能容纳两到三个摄像机。如果我放置三个以上，则会出现错误。

#Variables
cap = []
ret = []
frame = []
final = ""
i = 0
number_cameras = 2

# Initialization of lists. I use them to make the frame capture dynamic
for x in range (number_cameras):
    cap.append(cv2.VideoCapture(x))
    ret.append(x)
    frame.append(x)

#Start capturing frames
while (True):

    ret[i],frame[i] = cap[i].read()

    if i == number_cameras-1:

        final = cv2.hconcat ([cv2.resize (frame[x],(400,400)) for x in in range (number of 
        cameras)])
        cv2.namedWindow ('frame')
        cv2.moveWindow ('frame',0)

        cv2.imshow ('frame',final)

        i = 0
    else:
        i = i + 1

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

#I release the cameras
for x in range (number_cameras):
    cap[x].release()

#Destroy the windows
cv2.destroyAllWindows()

使用四台摄像机进行测试时的错误消息如下：

Using TensorFlow backend.
Camara  0
Camara  1
Camara  2
[ WARN:0] global C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-wbmte9m7\opencv\modules\videoio\src\cap_msmf.cpp (435) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback
Camara  3
Traceback (most recent call last):
  File "D:/Programacion/Desarrollo/PyCharm/Software Terminal/Automatizacion.Liquidaciones.Mensuales.Colectivos/f_main/c_main/prueba.py",line 80,in <module>
    final = cv2.hconcat([cv2.resize(frame[x],400)) for x in range(cant_camaras)])
  File "D:/Programacion/Desarrollo/PyCharm/Software Terminal/Automatizacion.Liquidaciones.Mensuales.Colectivos/f_main/c_main/prueba.py",in <listcomp>
    final = cv2.hconcat([cv2.resize(frame[x],400)) for x in range(cant_camaras)])
cv2.error: OpenCV(4.4.0) C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-wbmte9m7\opencv\modules\imgproc\src\resize.cpp:3929: error: (-215:Assertion failed) !ssize.empty() in function 'cv::resize'

[ WARN:1] global C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-wbmte9m7\opencv\modules\videoio\src\cap_msmf.cpp (435) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback
[ WARN:0] global C:\Users\appveyor\AppData\Local\Temp\1\pip-req-build-wbmte9m7\opencv\modules\videoio\src\cap_msmf.cpp (435) `anonymous-namespace'::SourceReaderCB::~SourceReaderCB terminating async callback

从已经非常感谢您！问候。