Biomedical Engineering Reference
In-Depth Information
Figure 10.23:
Weak-edge leakage testing. Top row: original image with starting
contour and geodesic snake which steps through. Middle row: oversegmentation
color region map and converged RAGS snake. Bottom row: undersegmentation
color region map and converged RAGS snake (original image courtesy of Bristol
Biomedical Image Archive, Bristol University, UK) (color slide).
where
A
and
B
correspond to ground-truth and RAGS localized optic disk re-
gions respectively, and
n
(
ยท
) is the number of pixels in a region. Table 10.2 shows
the result of measurement
M
demonstrating a 91
.
7% average performances for
both over/undersegmentation RAGS respectively.
The final example in Fig. 10.26 shows a darker cell center compared to the
cell outer region, but more significantlythe object of interest is surrounded by
