
150 Current Trends in Bayesian Methodology with Applications
FIGURE 7.3
Elastic shape models of the tulip poplar leaf. Top: Similarity-invariant. Bot-
tom: Affine-invariant.
ground truth boundary curves of 15 tulip poplar leaves that were extracted
from images found in a Google Image sear ch. Notice that in addition to the
inherent leaf shape variability, this data additionally exhibits an approximate
affine variability due to imaging from different camera angles. Fig. 7.3 shows
the r e sulting similarity and affine invariant elastic s hap e models, and one can
see from the random samples that the affine-invariant model eliminates the ...