Image Processing Reference
In-Depth Information
(10)
where
E
int
is the internal energy decided by the curve,
α
and
β
control the continuity and
smoothness, respectively.
E
ext
is the external energy decided by the image information. The
VFC Snake is an active contour model whose external force is VFC field. First defined a vector
field. kennel:
(11)
where
m
(
x
,
y
) is the vector magnitude and
n
(
x
,
y
) is the unit vector pointing to the kennel origin
(0, 0):
(12)
(13)
Here,
r
= (
x
2
+
y
2
)
1/2
. The external force is calculated by convoluting the vector field kennel
k
(
x
,
y
) and the edge map
f
(
x
,
y
), defined as
(14)
2.4.2 Improved VFC Snake model
First, we use the typical VFC Snake model to detect the lesion area; however, there are obvious
distortions in the segmented results. By analyzing the force field of the model, we observe that
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