Markerless AR
Formal
Markerless AR is used to denote an Augmented Reality application that does not need any pre-knowledge of a uses environment to overlay 3D content into a scene and hold it to a fixed point in space.
Practical
This term is used to denote an Augmented Reality application that does not need any pre-knowledge of a uses environment to overlay 3D content into a scene and hold it to a fixed point in space. Until recently, most AR fell under the category of marker-based AR, which required the user to place a tracker — an image encoded with information that translated by complex software to produce a 3D object that maintains special orientation within a scene — in order to achieve the desired effect.
