IEEE Consumer Electronics Magazine - March 2018 - 80

OUR IMPLEMENTED APPLICATION

4) A hand moving toward the receiver signals the video player to close.

APPLICATION DESIGN
RECOGNITION METHODOLOGY AND IMPLEMENTATION

In our design, the following hand gestures were used to control the playback of a video player (see Figure 7 for the
design concept).
1) No gesture indicates no action and to keep detecting the
new gesture.
2) A clap signals the video player to open and play a video.
3) A hand held vertically in front of the receiver signals to
pause or resume the player.

Start

The recognition methodology used is the same as the one
described in the "Results of Experiments on Hand Gestures"
section. In addition, our application was written using the
C programing language, and the user interface of the application is written in GTK+. Figure 8 shows the sequence
diagram of the application. Before the application/recognition starts, the wireless interface of the device should be
changed to monitor mode. Moreover, the transmitter (a
broadband router) and the receiver (a wireless interface)
should be located 0.5 m apart from each other. The suggested setup is shown in Figure 9.
After the application launches, a background process calls
the tcpdump software to continuously capture packets from
the sender. Every 3 s, tcpdump outputs the captured packets
into a dump file, which is overwritten each time. The process
then converts and extracts the RSSI signal strength values
into decimal number arrays. Subsequently, the average,
minimum, and maximum RSSI values can be calculated, and
the characteristics of the patterns of signal strength can be
examined by an array comparison.

Pause

Close

FIGURE 7. The gestures as the application controls.

User Interface

Tcpdump

Recognition System

MPlayer

User
1: Click [Start]
2: Call Tcpdump to
Capture Packets

Loop
[Until the User
Stops the
Program]
alt

[No Gesture]

3: Process RSSI
Values

<>

Start

[Clap]
<>

Pause

[Vertical Hand]
<>

Quit

[Hand Toward]
<>

FIGURE 8. The sequence diagram of our application.

80 IEEE Consumer Electronics Magazine

^

MARCH 2018



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