How can I plot the real-time intensity of a real-time image (imaq 1394)?

[Artie85]

I've a firewire camera.

i've interfaced my camera to my pc with labview and now I display real-time image. How can I plot intensity of a region time-dependent? 
Y-intensity 
X-time...I would watching the real-time variaions of the intensity... 

Thanks in advance

[ChristopheC · Accepted solution]

The light meter example does pretty much what you want to do. It is located here:

<Program Files>\National Instruments\<LabVIEW>\examples\Vision\2. Functions\Light Meter\Light Meter Example.llb\Light Meter Example.vi

In the example, the x-axis is the iteration number, but it is easy to modify to use a graph instead of a chart and plot the time instead.

Hope that helps.

Christophe

[Artie85]

Thanks! I was waiting to finish my program to reply you! I'm at the and so Thank you for your advice...

But now I have a problem...

I've saved overwriting my 'Light Meter Example'(labview 7.1)...and now nothing work and I don't remember what I modified or deleted trying some changes....

I've removed and than installed my labview and its driver ecc... but this 'example.vi' is that changed by myself again...

I didn't want click on 'save'...:-(

Could you, or somebody, help me maybe posting me this .vi, please?

Thanks indeed in advance!

[ChristopheC]

Here it is.