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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