Graphics Reference
In-Depth Information
Figure
.
.
A rosette map consisting of
Gabor filters. he half-peak magnitude frequency bandwidth
is set to one octave for each Gabor filter. Only the half-peak supports of the filters are shown in the
map
snake-balloon models and their improvements), region growing/competition meth-
ods, and other segmentation methods in order to analyze ultrasound images (Chen
etal.,
;Chen andLu,
;Chenetal.,
a,b,
,
).Forexample,
Ga-
borfilterscanbeconsidered inthespace-frequency domain,asshowninFig.
.
.An
ultrasound image is then transformed toa distance map bythe Gabor filter banks, as
illustrated in Fig.
.
. he active contour model can be modified with the features in
thedistance map inordertoobtain segmentation results,asdemonstrated inFig.
.
.
Morestudies are discussed in Chen et al. (
).Further improvements are reported
in Chen and Lu (
); Chen et al. (
a,b,
,
).
Magnetic Resonance Images
2.4
Magnetic resonance images (MRI) and functional MRI (fMRI) are important medi-
cal modalities for understanding human diseases and brain function. hese modali-
tiesarediscussedindepthinvarious topics on medicalimages(Suetens,
;Prince
and Links,
). A typical application of computational statistics to fMRIis the sta-
tistical parametric mapping (SPM, see http://www.fil.ion.ucl.ac.uk/spm/) system. In
an attempt to advance the study of MRI and fMRI images, the author and his collab-
orators segmented dynamic images with just a few training images that extend the
studies of spatial-frequential analysis to motion segmentation.
