Re: Toggle Between Two Cameras in Vision Processing
 

Alright so we tried it today but with no results, is there anything in that VI that we need to edit other than the robot global data thing?

Re: Toggle Between Two Cameras in Vision Processing
 

Nevermind we got it working, we just didn't assign DB/Button 1 anything *Facepalm

Re: Toggle Between Two Cameras in Vision Processing
 

It's designed to be run unmodified with the default dashboard. You shouldn't have needed to modify any globals. DB/Button 1 is one of the default buttons on the default dashboard.

Re: Toggle Between Two Cameras in Vision Processing
 

Would this work with Axis cameras or would it need to be fine tuned?

Re: Toggle Between Two Cameras in Vision Processing
 

I am now in a recursive loop WRT cameras.

Please see the thread below for some code which should work with Axis cameras. I wasn't able to test that code on a robot so it may have some issues. If so, please let me know.

http://www.chiefdelphi.com/forums/sh...d.php?t=133559

Re: Toggle Between Two Cameras in Vision Processing
 

Just wanted to say that you are the man adciv. Using your code to switch between two USB cameras, and it works fine. I switched the toggle to happen on a joystick button press, to be easy for our driver. Now he has the stationary camera at the bottom of the lift, to help line up crates, and a camera at the top of the lift attached to a pan/tilt to get a better view of the field.

Re: Toggle Between Two Cameras in Vision Processing
 

Thanks adciv.

I used your code with JS to switch cams.

The BOT Drivers were complaining about switching delay, so I tried opening two cameras and just switching the image source.

Didn't work. LV doesn't seem to like me opening two USB cameras. I get this error when I try to set the FPS on the second camera.

ERROR -1074360319 occurred at IMAQdx Start Acquisition.vi
NI-IMAQdx: (Hex 0xBFF69001) Internal error

I've included a simple example without the actual switching.
http://www.GEARSinc.org/images/cap.png

Everything work fine till I add the second cam. Any idea why LV is getting upset?

Re: Toggle Between Two Cameras in Vision Processing
 

I've definitely opened multiple USB cams on a roboRIO with no problem. I was processing them and not streaming. Are you sure that is the first call to fail?

Greg McKaskle

Re: Toggle Between Two Cameras in Vision Processing
 

I don't know which/when the call fails, but I do know that if I don't make the second call to SET FPS I don't get the error. Perhaps it's a reentrancy problem.

I'll try doing one camera setup at a time.

Phil.

Re: Toggle Between Two Cameras in Vision Processing
 

Still hunting this down..

Stringing all the camera setup mods in-line didn't help.
In trying to identify the point of the error, I probed all the error outs of the first and second camera setups.

Interesting to note that even though the open to the second camera works, the SET FPS does generate an error. See the attached probe sequence.

A final point. If I just swap the USB0 and USB1 constants, the second camera is successfully displayed, so I know the second cam is functional and configurable.

Phil.

Re: Toggle Between Two Cameras in Vision Processing
 

Starting to get worn out...

I reduced my problem down to two camera opens....

I open and start two cameras. The second start fails...

From the FP you can see that the system has identified the cameras properly.

Any idea why the second start doesn't work?

Re: Toggle Between Two Cameras in Vision Processing
 

It seems to be the WPI_CameraStartStopCount.vi that's causing the trouble.
The first call is fine, but the second call to IMAQdx Configure Grab is erroring out.

I can't tell if the "Cameras Address" is a valid input for the "Session" input of the Configure Grab function. It's being coerced.

The default "Start" action for an unopened USB cam is to open cam0. Is it trying to do this default action twice?

Phil.

Re: Toggle Between Two Cameras in Vision Processing
 

I have been able to reproduce the issue here and I'm speaking with the IMAQ group. I'll let you know what I find out.

Greg McKaskle

Re: Toggle Between Two Cameras in Vision Processing
 

Sorry for taking so long to pop in, been working on the robot too many hours.

I think I saw this problem when initially developing this code (Added about 40 min or so to the dev time). It would explain why I couldn't do an instant switch like I wanted.

Re: Toggle Between Two Cameras in Vision Processing
 

Woo Hoo!!!