dispossessed

Antoine,

I tried your vi, but still no luck. i couldnt get more than 11fps. however, i did a speed test to my HD and found out that it is runing at a speed of 32MB/sec. this is much less than what is supposed to be doing (320MB/sec), but it should still be enough for my requirements.

QUOTE (Antoine @ Jul 3 2008, 04:24 AM)

There we are, I couldn't test it because I don't have the hardware available at the moment, but I think with this base you have a good chance to make it work.

Hope this helps

Thanks a lot. i will try it today and inform you if it works or not. i hope it does! and thanks for the links above.

QUOTE (Antoine @ Jul 3 2008, 02:28 AM)

It's ok to http://forums.ni.com/ni/board/message?board.id=170&thread.id=337265' target="_blank">cross-post to other forums but please mention it

Last I made an application LV8.20 that saves up to 50fps for 10minutes the flowrate was close to 120Mo/s with RAID0 system.

17Mo/s on a fast HD should really be fine, as Crelf said, show your code and it will be easier to help you.

What I did for my application is 2 loops running in parallel, one extracting images as they are ready and copy them into a queue, the second loop keeps dequeueing and saving to disk as fast as possible. To see it the systems goes fast enough, graph the "elements in queue" to make sure it does not incease too much.

Hope this helps

i already posted the code above. please take a look at it and hopefully you might spot a glitch

by queing, you mean indexing the tunnel at the loop exit? if so, ive tried something similar, but still no success.

Thanks.

QUOTE (crelf @ Jul 2 2008, 09:14 PM)

Firstly, you're doing all your timing in software - the card you're using has 16Mb of onboard RAM to buffer the image data in hardware - use that and then only get it all out when you need too. Also, how long does the conversion to TUFF take? You probably don't need to do that in the acquisition loop.

yes, but 16MB is not enough space for my pictures. i need to acquire images for long times (scale of minutes. not less than 8min). and i need to save them in a certain file format, right? unless there is a way to save the RAW image directly. i know that TIFF is simplest kind of lossless format so it shouldnt take too much time. i could use JPEG which probably is faster, but i would lose information by doing that.

QUOTE (crelf @ Jul 2 2008, 08:30 PM)

Show us your code.

I attached it. dont worry about the name of the vi; i started out with the LLRing vi but then modified it.

Hi,

I want to save images directly to the hard disk during acquisition at a frame rate of 30fps. Although, this is a reasonable, not very high frame rate, im not achieving the frame rate im asking for. The maximum that i can get is about 14fps for 582x782, 10-bit images and an Ultra-320 15K RPM SCSI hard drive(which is empty; the OS is on another HD). According to my calculations, i should be able to easily save frames at 30fps, as all i am requiring is 17MB/sec, even if we assume that the bus speed is slow.

I am sure that there is something wrong going on. Could anyone please give me some advise or suggestions as how to fix this?

Using: Cohu 7700 Camera Link

PCI-1428

Labview 8.5.1

Thanks.

QUOTE (crelf @ Jun 5 2008, 06:54 AM)

I've http://mplab.ucsd.edu/standards/FourCameraSetup/A300_Series_Data_Sheet.pdf' rel='nofollow' target="_blank">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

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.

Thanks,

Leen