python opencv 拍照_在jupyter noteb中使用opencv显示网络摄像头中的图像

我正在尝试显示网络摄像头拍摄的图像。但是，存储捕获图像的变量是空的。此问题仅在使用网络摄像头时出现，而不是在播放mp4等视频时出现。这个问题是由Python版本引起的吗？我的OpenCV版本是3.4.3，Python版本是3.6.5。在import numpy as np

import cv2

from IPython import display

import matplotlib.pyplot as py

%matplotlib inline

def showVideo():

try:

print('카메라를 구동합니다.')

cap = cv2.VideoCapture(0)

except:

print('카메라 구동 실패')

return

print(cap.isOpened())

print(cap.read())

cap.set(3, 480)

cap.set(4, 320)

try:

while(True):

# Capture frame-by-frame

ret, frame = cap.read()

if not ret:

# Release the Video Device if ret is false

cap.release()

# Message to be displayed after releasing the device

print ("Released Video Resource")

break

frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)

# Turn off the axis

py.axis('off')

# Title of the window

py.title("Input Stream")

# Display the frame

py.imshow(frame)

py.show()

# Display the frame until new frame is available

display.clear_output(wait=True)

except keyboardInterrupt:

# Release the Video Device

cap.release()

# Message to be displayed after releasing the device

print("Released Video Resource")

pass

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