I'm new to AR, creating an AR app to "try wall painting". User start the app, scan's the wall and choose color to paint the wall virtually. Which library is good for this kind of app.
Does ARToolkit provides object recognition so that I can detect the wall and objects on the wall.
Wikitude has cloud recognition API but I'm not sure this can be done with it.
VuForia is one more library but I haven't tried.
Basically, for using Vuforia or ARToolkit kind of libraries, you need to have enough features for them to detect. These libraries search for images which you load into their database in advance. Something like a blank wall will not get detected, since it is smooth (It does not have any features). If there are objects or patterns on the wall, it might work - it depends if they have enough features for getting detected. There are indeed some good hardware-based solutions, like suggested above, but this is not what you want. If it's not a blank wall - I suggest you take a look at Vuforia, they have some pretty good samples and articles.