Embedding Gestalt Laws in Markov Random Fields by Song-Chun Zhu

Contour-based Feature Measures

Goal is to be generic

But generic shape features are hard to find

φ1 = κ(s), the curvature

κ(s) = 0 implies the linelets on either side of Γ(s) are colinear

φ2 = κ'(s), its derivative

κ'(s) = 0 implies three sequential linelets are cocircular

“Other contour-based shape filters can be defined in the same way”