ROIs are specified using ActivView's sub-tool AVTViewROI.

You can align ROIs automatically to moving parts with the help of ActivAlignment.

The results of ActivBlobFinder are "just" the extracted blobs, i.e., the corresponding regions in the image. These blobs can then be analyzed using other ActivVisionTools. For example, you can use ActivFeatureCalc to calculate various shape features for each blob. The results of ActivFeatureCalc can then be further evaluated using ActivDecision, before you output them via ActivFile, ActivSerial, or ActivDigitalIO.