Affine properties of the relative position PHI-descriptor
Pascal Matsakis · 2016
Colour, texture, shape, and relative position descriptors are fundamental visual descriptors. In particular, a relative position descriptor is a quantitative representation of the relative position of two spatial objects, and a basis from which models of spatial relationships (like inside, above, around, near) can be derived. The affine properties of visual descriptors have been the subject of much attention. Here, we focus on the PHI-descriptor, introduced in recent work. We show that it is a relative position descriptor with remarkable affine properties, and we illustrate these properties with two experiments.