IEEE Consumer Electronics Magazine - May 2018 - 79

Use
100%
CPU
0

Time

100%
HPU
Engine 0
0

Time

100%
Memory
0

Time

0

Time

SoC 100%
Power

System 100%
Power
0

t1

t2

t3

Time

FIGURE 8. The HoloLens CPU, HPU, and memory use.

Table 4. The HoloLens performance evaluation with different data sets.
Data

City Model

Data Set

Memory

HPU

CPU

Frame
Rate

SoC Power

System
Power

Name

Size (Megabytes)

Size (Kilobytes)

(Megabytes)

(%)

(%)

(fps)

(%)

(%)

No city model

0

0

880

6

8-30

58-60

37-40

50-53

Pure city model

75

0

1,699

91-100

10-35

3.8-3.9

89-94

72-77

Places of interest

75

65

1,708

93-100

10-35

3.8-4.1

90-97

72-82

Youth services

75

326

1,715

93-100

10-35

3.8-4.2

90-97

75-81

Heritage inventory

75

1,285

1,747

93-100

10-35

3.8-4.2

90-97

75-82

storage size. This is mainly because city data sets are
stored with XML file format and then processed to generate corresponding 3-D contents before visualization.
Storing data sets in direct 3-D file formats may improve the
balance between storage size and computing power. Second, implementing parallel computing to use multiple
engines of HPU may also improve our application's performance on HoloLens.

GESTURE INTERACTION IMPROVEMENT
Because the gesture-detection camera is embedded in the
front center of HoloLens, users need to put their finger in
front of HoloLens within a limited region. Occasionally,
after a user turns his/her head, he/she may forget to move
the hand with the head, which results in gesture-detection
failure. Holding a hand in front of HoloLens at head
level can easily cause user fatigue. Therefore, a broader
MAy 2018

^

IEEE Consumer Electronics Magazine

79



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