Game Development Reference
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Figure 3. 2D model of the eye.
Figure 4. 2D models of the mouth.
(a) mouth-open model (b) mouth-closed model
is set to a fixed fraction of the eye width that is the distance between two eye
corner positions
h
l
and
h
r
. The parameters of the parabolic curves (
a
u
,a
o
)
represent the opening heights of the eyelids. It is assumed that both eyes have
the same opening heights. In order to represent eye features with a 2D eye
model, eight parameters have to be estimated, namely: (i) four eye corner points,
(ii) two pupil points, and (iii) two opening heights
of the eyelids.
2D mouth models
The mouth is represented by a
mouth-open
model or a
mouth-closed
model. The
mouth-open
model (ref. Figure 4a) consists of four parabolic curves,
W
i
, and the
mouth-closed
model (ref. Figure 4b) of three parabolic curves,
W
i
(Zhang,
1998). The parameters (
o
u
, o
o
) describe the opening heights of the lips and the
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