python - 在Ubuntu 16.04(主机)上的OpenCV中无法使用集成的网络摄像头

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Permanent fix for Opencv videocapture

(2个答案)


2年前关闭。




Ubuntu 16.04上的OpenCV中集成的网络摄像头抛出以下错误。我用其他程序检查了奶酪，它会显示静止图像和视频，因此似乎相机本身不是问题所在。

我用来测试的代码:

    import cv2
    import numpy as np
    import time
    cam = cv2.VideoCapture(2)
    if not cam.isOpened():
     print('Cannot open camera')

    while True:
     ret,frame = cam.read()
     cv2.imshow('webcam', frame)
     if cv2.waitKey(1)&0xFF == ord('q'):
      break

   cam.release()
   cv2.destroyAllWindows()

错误 :

Cannot open camera (feedback from script at if not cam.isOpened():).

OpenCV Error: Assertion failed (size.width>0 && size.height>0) in imshow, file /io/opencv/modules/highgui/src/window.cpp, line 325

Traceback (most recent call last): File "Video_test.py", line 13, in cv2.imshow('webcam', frame) cv2.error: /io/opencv/modules/highgui/src/window.cpp:325: error: (-215) size.width>0 && size.height>0 in function imshow

任何帮助，将不胜感激。谢谢!

最佳答案

使用cam.open()尝试以下操作:

import cv2
import numpy as np
import time

cam = cv2.VideoCapture(2)  # camera index (default = 0) (added based on Randyr's comment).

print 'cam has image : %s' % cam.read()[0] # True = got image captured. 
                                           # False = no pics for you to shoot at.

# Lets check start/open your cam!
if cam.read() == False:
    cam.open()

if not cam.isOpened():
    print('Cannot open camera')

while True:
    ret,frame = cam.read()
    cv2.imshow('webcam', frame)
    if cv2.waitKey(1)&0xFF == ord('q'):
        break

cam.release()
cv2.destroyAllWindows()

您也可以使用 cam = cv2.VideoCapture(value)值播放。现在将其设置为2。尝试一个范围..例如1-10。

关于python - 在Ubuntu 16.04(主机)上的OpenCV中无法使用集成的网络摄像头，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47533291/

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Answer 1

使用cam.open()尝试以下操作:

import cv2
import numpy as np
import time

cam = cv2.VideoCapture(2)  # camera index (default = 0) (added based on Randyr's comment).

print 'cam has image : %s' % cam.read()[0] # True = got image captured. 
                                           # False = no pics for you to shoot at.

# Lets check start/open your cam!
if cam.read() == False:
    cam.open()

if not cam.isOpened():
    print('Cannot open camera')

while True:
    ret,frame = cam.read()
    cv2.imshow('webcam', frame)
    if cv2.waitKey(1)&0xFF == ord('q'):
        break

cam.release()
cv2.destroyAllWindows()

您也可以使用 cam = cv2.VideoCapture(value)值播放。现在将其设置为2。尝试一个范围..例如1-10。