在python + openCV中使用网络摄像头时出现问题 [英] Problems using webcam in python + openCV
问题描述
我正在使用以下代码通过openCV + python访问我的网络摄像头...
I am using the following code to access my webcam using openCV + python...
import cv
cv.NamedWindow('webcam_feed', cv.CV_WINDOW_AUTOSIZE)
cam = cv.CaptureFromCAM(-1)
然后我在控制台中收到以下错误...
I am then getting the following error in the console...
VIDIOC_QUERYMENU: Invalid argument
VIDIOC_QUERYMENU: Invalid argument
VIDIOC_QUERYMENU: Invalid argument
我最初使用的是
cv.CaptureFromCAM(0)
要访问相同且具有相同问题的设备，并使用-1，因为它假设是要拾取任何网络摄像头.
to access the same and had the same issue and used -1 because it is suppose to pick up any webcam.
我还测试了Ubuntu是否可以识别网络摄像头，并且可以识别.我正在使用v4l2作为网络摄像头.
I also tested to see if Ubuntu recognizes the webcam and it does. I am using v4l2 for the webcam.
{编辑}
我正在使用以下代码显示视频源，似乎只显示了网络摄像头捕获的一个图像，而不是连续的视频源...
I am using the following code to display a video feed, it seems to only be showing just one image the web cam captured instead of a continuous video feed...
import cv
cv.NamedWindow('webcam_feed', cv.CV_WINDOW_AUTOSIZE)
cam = cv.CaptureFromCAM(-1)
feed = cv.QueryFrame(cam)
cv.ShowImage("webcam_feed", feed)
cv.WaitKey(-1)
推荐答案
WOW，在我发布此内容后，在15分钟内回答了我自己的问题.我进行了一些研究，网络摄像头仅捕获一张图像的原因是由于...
WOW, answered my own question in 15 after me posting this. I did some research and the reason for the web cam only grabbing one image is because of the...
cv.WaitKey(-1)
这不允许刷新窗口的内容.我将数字设置为10 ...
This doesn't allow the contents of the window to refresh. I set the number to 10...
cv.WaitKey(10)
效果很好.我也尝试了100，但没什么区别.当数字为1000时，我只会看到一个差异.我使用1是因为它看起来运行得最顺畅.
and it worked beautifully. I also tried 100, but saw no difference. I only saw a difference when the number was 1000. I use 1 because seems that it runs the smoothest.
这是显示网络摄像头的完整代码
Here is the full code to display a web cam feed
import cv
cv.NamedWindow("webcam", 1)
cam = cv.CaptureFromCAM(-1)
While True:
feed = cv.QueryFrame(cam)
cv.ShowImage("webcam", feed)
cv.WaitKey(1)
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