The purpose of this study is understand the movements of the person while walking, determine the repeatability of the Microsoft® Kinect™ and use coordinates of specific points to see if the angle can be measured with the Microsoft® Kinect™. The repeatability in this study is the ability to duplicate skeletal point measurements.

1. MICROSOFT®
KINECT™
– SKELETAL REPEATABLITY
The purpose of this study is understand the movements of the person while walking, determine the repeatability of the
Microsoft® Kinect™ and use coordinates of specific points to see if the angle can be measured with the Microsoft®
Kinect™. The repeatability in this study is the ability to duplicate skeletal point measurements.
Derek Jackson, Carl Zaderej, Kevin O’Connor, Stephen Elliott
Overview
•Skeletal Points to be
used:
•Head
•Shoulder Center
•Spine
•Hip Center
•Knee
•Ankle
K
I
N
E
C
T
90 inches
X: .77 -.78
Y: .19
Z: 2.76- 2.77
X: .66 -.67(neg)
Y: .30 - .31
Z: 3.31 – 3.32
X: .81
Y: .31 - .32
Z: 3.41 - 3.43
X: .65 -.66(neg)
Y: .23
Z: 2.79
^
21.875 inches
22.125 inches>
<21.875 inches
22.3125 inches
v
Findings
-- ground is not level
-- box is not symmetric
Lab door
I
R
I
S
C
A
M
Experiment Design
Experiment
The subject walked towards and away from the Microsoft® Kinect™ , and the skeletal points selected were each graphed
to test the repeatability of the product for research. The X ,Y, and Z coordinates were measured multiple times, and then
compared to see if any change was found. The would be useful in applications such as athletics and border control.
Graph Analysis
0
0.5
1
1.5
2
2.5
3
3.5
Location
Time
Hip Center Test 1
X Coordinates
Z Coordinates
Y Coordinates
0
0.5
1
1.5
2
2.5
3
3.5
Location
Time
Hip Center Test 2
X Coordinates
Z Coordinates
Y Coordinates
-1
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
Location
Time
Knee Test 1
X Coordinate
Z Coordinate
Y Coordinate
-1
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
Lo0cation
Time
Knee Test 2
X Coordinate
Z Coordinate
Z Coordinate
0
0.5
1
1.5
2
2.5
3
3.5
4
Location
Time
Head Test 2
X Coordinates
Z Coordinates
Y Coordinates
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
Location
Time
Head Test 1
X Coordinates
Z Coordinates
Y Coordinates
0
0.5
1
1.5
2
2.5
3
3.5
Location
Time
Shoulder Center Test 1
X Coordinates
Z Coordinates
Y Coordinates
0
0.5
1
1.5
2
2.5
3
3.5
Location
Time
Shoulder Center Test 2
X Coordinates
Z Coordinates
Y Coordinates
0
0.5
1
1.5
2
2.5
3
3.5
Location
Time
Spine Test 1
X Coordinates
Z Coordinates
Y Coordinates
0
0.5
1
1.5
2
2.5
3
3.5
Location
Time
Spine Test 2
X Coordinates
Z Coordinates
Y Coordinates
Results
ConclusionAfter graphing and analyzing the data we determined that the Microsoft®
Kinect™ has good repeatability. As a result, we conclude that the Microsoft®
Kinect™ can be considered a useful tracking devices and a practical research
tool.
Future Work
Squatting is a popular lower body lift for the population that exercises. Increase the
understanding of the correct posture while performing the lift. Better results and lower the
chance of injury. Using the Microsoft® Kinect™ (or similar technology) to facilitate accuracy of
squatting position.
The measurements were
recorded from the subject
while the subject was
within the red box. The
subject would walk into the
box, have iris captured,
and turn around and walk
out of the designated area.
This part of the experiment is with the
head. As you can see from the graphs,
the Microsoft® Kinect™ appears to have
good repeatability since both graphs
are near duplicates of each other.
This part of the experiment is with the
shoulder center. As you can see from
the graphs, the Microsoft® Kinect™
appears to have good repeatability
since both graphs are near duplicates of
each other.
This part of the experiment is with the
spine. As you can see from the graphs,
the Microsoft® Kinect™ appears to have
good repeatability since both graphs
are near duplicates of each other.
This part of the experiment is with the
hip center. As you can see from the
graphs, the Microsoft® Kinect™ appears
to have good repeatability since both
graphs are near duplicates of each
other.
This part of the experiment is with the
knee. As you can see from the graphs,
the Microsoft® Kinect™ appears to have
good repeatability since both graphs
are near duplicates of each other.
Points of Interest