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Hi Jonathan,
I think the CHMT machine have such a USB capture device that
works with OpenPnP, including a switcher, to switch between the
two analog camera, which OpenPnP supports. Perhaps the CHMT users
could tell you the product name, and perhaps the switcher could be
extended to four, five or all six cameras, because frankly, I
guess running 6 good quality MPEG cameras as web cams (full video
streaming) requires
too much CPU power (outside OpenPnP).
Furthermore, like I said earlier, I would be ready to try and
implement the "pseudo-ganged-up" approach in OpenPnP if somebody
had a machine and was willing to do some thorough testing and
videoing of the result (just for the coolness of it š).
"Pseudo-ganged-up" means camera capture would not be truly
simultaneous, but almost. I assume it would still save a
lot of job time:
https://groups.google.com/g/openpnp/c/0VRTK6-hUBQ/m/YXPUh4h7BgAJ
(Side note: the "multi-shot bottom vision", I mentioned there, was implemented in the mean-time)
_Mark
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I would definitely prefer to keep the cameras, yes. I've spent many hours trying to work out a way to make them appear to the computer in a way that OpenPnP can detect them, but haven't had success yet.The 8-channel analog capture card that is used by the factory Kayo system doesn't seem to have any way to make its inputs appear to the OS as cameras. I also have several USB TV capture devices, and they don't appear as webcams either. They can only be accessed by TV tuner software.
Hi Bing,
The cameras need to be aligned with the nozzles. So I would always prefer two cameras with an adjustable mount. It is much easier to make the cameras adjustable than the nozzles.
As to the number of USB connection. Yes, this is a also a
concern.Ā Two of the recommended 720p ELP cameras can be connected
per USB port (more specifically per USB root hub) on your
computer, you will need another port for the next pair.Ā Some
cameras have such a high bandwidth that only one can be
handled per root USB hub (e.g. FullHD ELP model). Note, USB hubs
are just electrical muxers, so it does not help to add a hub, or
that you have USB 3 etc.
https://github.com/openpnp/openpnp/wiki/USB-Camera-Troubleshooting-FAQ
Analog cameras on the other hand can easily be switched in any
number, I guess, you just need an analog switch that can take the
video bandwidth. The switching of course adds a certain camera
settling delay, as it will switch randomly into V-sync, I guess:
https://github.com/openpnp/openpnp/wiki/SwitcherCamera
_Mark
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This is a very expensive and cumbersome way to do it. Be mindful
of possible lag. You don't want your camera frames to lag behind
by several 100ms.
_Mark
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Yeah, I think Jonathan needs something like that.
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