How to recognize images in with ARToolKit

I am using ARToolKit for recognizing some images. I made the official tutorial https://github.com/artoolkit/ar6unity-wiki/wiki/Setting-Up-Your-First-ARToolKit-for-Unity-Scene
in this site. However, I do not need to track a object, I just need to simply recognize the image and done. Which script and line is recognizing the images?

See this: Tutorial de realidad aumentada: Marcadores NFT - ARtoolkit - Unity3d - YouTube