peekdata help

2012 3 11
3 个回答
4 次查看（30 天）

0 个投票

Hi folks,
I'm having a bit of trouble with peekdata.
I have a video object created called 'vid',
I'm using
triggerconfig(vid,'manual');
start(vid);
RGBData = peekdata(vid,1);
This works fine, I get a 3d array in RGBData. But it only works in debug mode. As soon as I run it from the GUI I get...
"Warning: PEEKDATA could not return all the frames requested."
and RGBData is now empty... I can't understand why it works in debug but not when running normally.
thanks in advance, this is driving me nuts. Ollie
p.s. i'm trying to gather frames from a webcam indefinitely, is there's a better way to go about it?

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回答（3 个）

Walter Roberson
Walter Roberson 2012-3-11

0 个投票

Possibly there simply has not been enough time for the data to arrive. Try adding a small pause()

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Oliver
Oliver 2012-3-11
hi, thanks for your response, i tried adding pause(5) and it still doesn't work.
I set the debug after the line RGBData = peekdata(vid,1);

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Image Analyst
Image Analyst 2012-3-11

0 个投票

Try getsnapshot() instead. See if that works.
Oliver
Oliver 2012-3-11

0 个投票

Thanks, I tried getsnapshot() but found it to be too slow.
Whilst trying to figure out what was wrong I used a try;catch setup and after a couple of failed calls to peekdata(vid,1) it started working!

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Oliver
Oliver
2012-3-11

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