What backend API to use with DAHENG MER-132 USB3 Vision camera
Hi,
I have a DAHENG MER-132 USB3 Vision camera which I am trying to access with opencv (python 3.7, Win 10).
I followed some example code to get my webcam working with capture = cv.VideoCapture(0) and works great. I figured cv.VideoCapture(1) would work for the next camera (external DAHENG MER-132 USB3) but opencv doesn't detect it
Device Manager detects the camera ok and reports it as "Machine Vision Digital Cameras / USB3 Vision Digital Camera, and the Daheng Galaxy Viewer software can display images ok, so hardware is working ok.
Is there a particular backend API I need to use with this type of camera?
If not, are there any other suggestions to get this camera working with opencv/python?
Thanks, Brendan.
which opencv version is it ?
try the DSHOW backend (default is MSMF):
I tried
CAP_DSHOW,CAP_VFWand many of the other backends, but couldn't find anything that worked.pip freezereportsopencv-python==4.1.1.26Github shows the latest release as being
4.1.2. Is that likely to have better support for USB3 Vision cameras?does it work with VLC / mediaplayer ? does your camera software come with a c++ sdk ?
VLC only gives me two options for video capture device: None, Integrated Web Cam. It does not appear to detect the Daheng USB3 camera.
Yes, there is an SDK available. I was able to get a python library (.pyd) file which is a wrapper around the SDK. It seems to work so I can at least get images now, but I'm wondering if it is possible to use opencv directly?
ah, ok, but sad, since vlc is using similar dshow / msmf code internally
opencv is mainly a computer-vision library, you can use it no matter where your images come from.
(it's not about using webcams, which most python noobs seem to think)