cv2 and picamera

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Fri, 02 Sep 2016 - 11:20
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awood85
awood85's picture
cv2 and picamera

Being a python beginner I think I'm missing something regarding the picamera use and opencv's cv2 or am I just being a nump(t)y ?

Isn't cv2 aimed at usb camera usage and not the picamera so calls to cv2.VideoCapture(0) give: TypeError Required argument 'device' (pos 1) not found.

Thanks

Adam

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Fri, 02 Sep 2016 - 12:06
piborg
piborg's picture
Pi Camera and OpenCV

Originally we did use the picamera module to get the video feed.
The trouble is that we did not seem to be able to get enough speed out of it at higher frame rates.

We changed to using the standard OpenCV interface for accessing cameras to get around this problem.
The cv2.VideoCapture class works with any attached camera which supports Video4Linux (V4L).

By default the Pi Camera does not have Video4Linux support, but a driver has been written already for it.
Our script (Formula.py) loads this driver using the command: sudo modprobe bcm2835-v4l2 before trying to talk to the camera.

The simulator also uses this interface to open a network stream for processing images.

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Fri, 02 Sep 2016 - 13:08
awood85
awood85's picture
Ah great, thanks for clearing

Ah great, thanks for clearing that up.

Adam

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