Hi,

I need to take images continuously at high frame rates (~60fps) and then save these images on hard disk. I have no prior knowledge of how many images i will eventually be needing and i dont want to save the images in AVI format, but rather PNG.
I tried using buffers to store my images while the camera is still taking pics and then saving them on the hard disk when the camera has finished acquisition, however, the frame rate that the camera is acquiring images at seems to be always much lower than 60fps.

Does any one have an idea about how to take pics at 60fps and at the same time save them in PNG format?

PS: softwares im using are LABVIEW 8.5 and IMAQ.
Basler Camera A302b
PCI 1428




Thanks,
Leen

This post has been edited by dispossessed: Jun 5 2008, 05:15 AM

I've confirmed that your camera can acquire at 60fps. Can you please upload your code so we can see if there's anything in there that's causing the bottleneck?

attached is the code that i was trying to modify. i found this code on one of the NI website pages.

Thanks,
Leen

Although not the worst example I've seen, it certainly is not the best. Try looking at the LL Sequence.vi found in LabVIEW under the Help-->Find Examples... menu. Click the Browse tab, and select the Directory Structure option. Then find the IMAQ folder and under this is the IMAQ Low Level.llb where you'll find the LL Sequence.vi. Add to this VI the PNG saving portion of your example.

As for not knowing how long you need to acquire, it is fairly difficult to allocate memory "on the fly" without losing frames and very complicated. The best thing to do it to is to allocate a lot of frames and then terminate the sequence by using the IMAQ Stop.vi (you'll have to have a parallel loop monitoring the abort button). In this parallel loop you can also monitor the progress by calling the IMAQ Status.vi to get the current frame.

In a nutshell, what you are trying to do is fairly complicated and may take a lot of time to develop.

Bruce

This question is also in the NI Forums at:

http://forums.ni.com/ni/board/message?boar...d=77174#M328986

...maybe you should look at GigE Vision:
GigE Vision: Under the Hood Video


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--Mikael