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python - OpenCV 错误：（-215：断言失败）size.width>0 && size.height>0 in function 'imshow'

问题描述

我是 OpenCV 的新手，正在尝试在我的计算机上制作实时面部跟踪器。我的视频输入似乎有问题（它没有得到任何东西吗？）。我在 Mac 笔记本电脑上，正在尝试使用我的内置网络摄像头。

错误：

cv2.error: OpenCV(4.3.0) /Users/travis/build/skvark/opencv- 
python/opencv/modules/highgui/src/window.cpp:376: error: (-215:Assertion failed) size.width>0 
&& size.height>0 in function 'imshow'

代码：

import numpy as np
import cv2

cap = cv2.VideoCapture(0)

while True:
    #capture frame by frame
    ret, img = cap.read()
    cv2.imshow('test', img)


cv2.waitKey(0) & 0xFF
cv2.destroyAllWindows()
cap.release()

我试图将 cv2.VideoCapture(0) 更改为 cv2.VideoCapture(1)，但这导致了这个错误：

You might be loading two sets of Qt binaries into the same process. Check that all plugins 
are compiled against the right Qt binaries. Export DYLD_PRINT_LIBRARIES=1 and check that 
only one set of binaries are being loaded.
QObject::moveToThread: Current thread (0x7ff06a82c5d0) is not the object's thread 
(0x7ff06a876c30).
Cannot move to target thread (0x7ff06a82c5d0)

标签： pythonpython-3.xnumpyopencv

解决方案

import cv2
import numpy as np

cap = cv2.VideoCapture(0)

# Check if camera opened successfully
if (cap.isOpened()== False): 
  print("Error opening video stream or file")

while(cap.isOpened()):
  ret, frame = cap.read()
  if ret == True:

    cv2.imshow('Frame',frame)

    if cv2.waitKey(25) & 0xFF == ord('q'):
      break

  else: 
    break

cap.release()

cv2.destroyAllWindows()

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