Webcam image acquisition

[Drip]

Hey everyone,

I'm somewhat new to Labview and I've only recently gotten the Vision Development Module and the Vision Acquisition software. It's extremely new to me and I'm at a loss. I searched around and couldn't seem to find exactly what I'm looking for, or maybe I didn't understand it enough to know. I'm really just looking for something to get me started. I'm currently using my laptop and I wanted to create a VI that showed what my webcam was seeing continuously, allows the user to drag and focus on a specific area, and can take a snapshot of the user defined spot.

Ultimately I'm going to use the snapshotted image as a comparison to a later snapshotted image. I'm just looking for somewhere to get started. I've played around with some of the functions and was able to see what my webcam was seeing though I had no clue how to take a snapshot of the image.

Thanks in advance for the assistance.

EDIT: I added a VI of what I'm currently working with that I found from searching around. I'm just stuck at the snapshoting of the defined area(the drag and select tool on image indicator).

[josborne]

I think what you want to do is called ROI... region of interest.

See here for an example:  https://decibel.ni.com/content/docs/DOC-5531

[josborne]

Also, you might want to re-post here:

http://forums.ni.com/t5/Machine-Vision/bd-p/200

I often find the vision experts hang out in that forum.

[Drip]

Hey thanks for the reply.

I will post there.

I appreciate the assistance and will look into the ROI stuff.

[josborne]

This looks like a good example too:

http://www.ni.com/example/30249/en/

[CarlosOtiniano]

reading your message you want to capture from webcam imaenes your laptop, this program in Labview capture images from a USB camera to your application for further processing using the NI Vision module.

[CarlosOtiniano]

If we draw ua perform extraction of the region of interest with a function for image processing that captures the last event of the RGB image (extract image coordinates and ROI)...