Figure 2

A toy example. A toy example to illustrate the geometric measure M _l (p,q) of Eq. (5) for a feature pair (p,q) at codeword k, and with H^k(P) = H^k(Q) = 1. Pyramid Match Kernel [11] returns 1, since it ignores feature space-time locations; Our AMK Type II returns a matching score using Eq. (6) as: $\left(1-\frac{|3-6|}{6}\right)\ast \left(1-\frac{|7-5|}{8}\right)\ast \left(1-\frac{|1-3|}{4}\right)=0.5\ast 0.75\ast 0.5=0.1875$, which indicates the geometric affinity of the two features.