Re : NI vision

[Mustathna]

Hello,

Is there anyway that NI Vision Assistant (version 8.5) can take videos of an event and track a region of interest throughout the video. Basically, I'm trying to track the rotations of a deformed wheel. I want to see how the deformation of the wheel changes as it rotates. Also, is it possible to measure how much it has deformed every time interval using pattern matching?

Thanks

[toto26]

Hi,

Yes you can do it by triggerring your camera with an external trigger (so webcams won't do the jobs, use machine vision cameras instead). For instance, use a sensor that will gives you a top everytime the wheel has made a turn.

Then configure your camera to be extrenally triggered by this signal.

Then the next step for image processing could be done with different techniques. But it would be better to have some images in order for us to get an idea of what you are trying to do.

Regards

[Mustathna]

Hello toto26,

I have an AVT Guppy F808B camera. I'm trying to capture video of a wheel rolling under high pressure (see picture attached). The thing is that I want to stop the video once the caster has returned to its 'circular' shape if at all. That might happen before it makes a full 360 degrees. After, I want some kind of method to track that deformed portion of the wheel and measure the distance from the tip of the wheel to the axle. I know how to do this using pattern matching and the caliper function on one image. But I have no idea how to do it on a short video clip (imagine the caster in the picture but rolling). 

Thank you for your help