Information Technology Reference
In-Depth Information
1
0.8
0.6
0.4
0.2
0
y
x
Fig. 11.6
Graphical representation of the similarity function
F
(
x
,
y
)
T
∑
t
·
a
x
[
t
]
·
s
i
[
t
]
t
=
0
t
i
=
(11.2)
T
∑
t
=
0
a
x
[
t
]
·
s
i
[
t
]
T
∑
t
=
0
a
x
[
t
]
·
s
i
[
t
]
a
i
=
(11.3)
T
∑
s
i
[
t
]
t
=
0
T
∑
2
0
(
t
−
t
i
)
·
a
x
[
t
]
·
s
i
[
t
]
t
=
2
t
i
=
σ
(11.4)
T
∑
a
x
[
t
]
·
s
i
[
t
]
t
=
0
T
∑
2
0
(
[
]
−
)
·
[
]
a
x
t
a
i
s
i
t
t
=
2
a
i
=
σ
(11.5)
T
∑
s
i
[
t
]
t
=
0
11.3
Quality of the Gait
Based on the areas of the rectangles (
A
1
A
4
) which summarize the values of
the dorso-ventral acceleration (
a
x
), we have defined two parameters to measure the
quality of a human gait, namely homogeneity (
A
2
A
3
,
,
,
H
) and symmetry (
S
).
