Extracting part of an image

[Bielak]

Hi guys, i have a question.

What is the best way to extract the common part of 2 pictures to work on it. What i'm trying to do is a human tracking system, using simple webcam, and i encountered some problems to achieve it. I tried to change both images into gray scale, then used imaq image to array, now i would like to compare arrays in a for loop, then fill common parts with 0 and the rest with values from grabbed image. Is there any better way to do it? 

[Simon_T]

Hi,

To simply compare images, you can use the IMAQ Compare VI, or the IMAQ Correlate VI, but I think I we have a better solution for you:

Please read up on the IMAQ Track Objects VI and the Tracking palette in general, it may be exactly what you are looking for.

As usual, there are also some great examples for Object Tracking installed with the Vision module. You can find them using the Example Finder, or in this directory:

LabVIEW\examples\Vision\Tracking\