Acquisition Frame Rate Limit

[lymantc]

So I am using a Prosilica GC640, with a GigE vision ethernet connection, camera to try to take images and track a rolling ball.  Now the camera is spec'd to take 200 fps at 640x480 resolution and in MAX the "AcquisitionFrameRateAbs" field reflects this (~188).  However there is another field that is called "AcquisitionFrameRateLimit" that I can not get to go over 66 fps.  What else can I look at/adjust to try and get the camera to acquire frames closer to its advertised rate?

Thanks,

Ted

[BlueCheese]

Hi Ted,

I believe on the Prosilicas you'll need to manually change the exposure time shorter in order to get the 200fps. At its default exposure setting you'll see the 66fps cap. Additionally, I believe you need to enable the frame rate control via a separate attribute before it takes effect (you may have already done this). I don't have the camera in front of me at the moment, so I can't tell you what those attributes are right now. Please let me know if you continue having problems after adjusting the exposure time.

-Eric

[michaeld]

Hello Ted!

How do you have your camera connected to your development machine? Are you using a gigabit ethernet port and not a standard 10/100 port? Are you connecting to this camera over a network, or through a crossover cable?

[lymantc]

Thanks, it actually was the exposure time setting.  It is up to running at the full speed that it should be now.

-Ted

[Anonymous]

On Sep 3, 12:40 pm, lymantc <x...@no.email> wrote:
> So I am using aProsilicaGC640, with a GigE vision ethernet connection,&nbsp;camera to try to take images and track a rolling ball.&nbsp; Now the camera is spec'd to take 200 fps at 640x480 resolution and in MAX the "AcquisitionFrameRateAbs" field reflects this (~188).&nbsp; However there is another field that is called "AcquisitionFrameRateLimit" that I can not get to go over 66 fps.&nbsp; What else can I look at/adjust to try and get the camera to acquire frames closer to its advertised rate?
> &nbsp;
> Thanks,
> Ted

Hi Ted,

Prosilica cameras power-up with a default exposure time of 15 ms,
which, surprise, surprise, equals 66 fps (1/0.015). If you decrease
the exposure time to something less than 1/200, you will be able to
achieve 200 fps at 640x480.

Regards,
Marty