visualizing off-screen locations on small mobile displays sean gustafson master of science thesis...
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Visualizing Off-Screen Locations onSmall Mobile Displays
Sean Gustafson
master of sciencethesis defense
Dec 15 / 2008
14
cut lines color
ovalsclustering
Irani et al.Baudisch & Rosenholtz
initial approaches
separatevisually
35
1.wedge is more accurate
2.larger improvement in dense condition
3.larger improvement in corners
(no hypothesis about task time)
hypotheses
39
error in pixels
locate task
Err
or
(pix
els) 60
40
20
0
SparseDense
Side
Wedge
Halo80
Corner
SparseDense
42
1.wedge is more accurate
2.larger improvement in dense condition
3.larger improvement in corners
hypotheses
57
results50
100
200
300
Depth Error
Dis
tanc
e
-100 0 100 200 300-60
60
0
-60
60
0
-60
60
0
-60
60
0
Bre
ad
th E
rro
r
61
minimizing errors
• choose smallest base and leg length that still maintains small orbital and low bias
• base length of at least 50px, 100px for longer distances
• a large leg length (above 8px) does not result in smaller orbital
• avoid heavily rotating wedges
63
1. summary of existing techniques and criteria for evaluating them
2. introduction of Wedge
3. introduction of the concept of degrees of freedom and dynamic layout
4. evaluation of Wedge
5. preliminary model
contributions
78 locate task
SparseDense
Err
or
(pix
els
) 60
40
20
0SparseDense
SideCorner
Wedge
Halo80
SparseDense
Tim
e (
ms)
3000
2000
1000
SparseDense
SideCorner
Wedge
Halo
0
full results
79 avoid task
full results
SparseDense
Err
or
Ra
te %
50
40
30
20
10
0SparseDense
Wedge
Halo
SideCorner
Tim
e (
ms)
5000
4000
2000
0
SideCorner
Wedge
Halo
SparseDense SparseDense
3000
1000
80 closest task
full results
SparseDense
Err
or
Ra
te %
60
40
20
0SparseDense
WedgeHalo
SideCorner
SparseDenseT
ime
(m
s)
6000
4000
2000
0
SparseDense
SideCorner
WedgeHalo