The
Statistic
The
histogram of feature φ over curve
Γ
is
H(z;
φk, Γ) = ∫δ(z-φk(s))
ds
δ is the Dirac function: mass 1 at 0, and 0 otherwise
μ(z; φk)
denotes the average over all images
Zhu claims μ is a close estimation
of the marginal distribution of the “true distribution” over
shape space, assuming the total number of linelets is small.