IEEE Consumer Electronics Magazine - March 2018 - 81
Table 5 shows the results using a confusion matrix. The
no-gesture condition has the highest sensitivity, specificity,
and efficiency values. Consequently, the application does
not trigger any function if the user does not perform a gesture. The results of the sensitivity, specificity, and efficiency
When no gesture is recognized, the command prompt
shows the message "no gesture detected." When the clap
gesture is recognized, the program calls the MPlayer (video
player) software and begins playback. When the verticalhand gesture is recognized, the program sends a pause command to the MPlayer. When the video is paused, another
pause command resumes the playback. Furthermore, when
the motion of the hand moving toward the receiver is recognized, the program sends a quit command to the MPlayer
application. The user interface of the application is shown
in Figure 10.
ACCURACY OF THE APPLICATION
Classification accuracy was used to measure the classification
performance, and we used this measurement scheme to test
the performance and accuracy of our application in recognizing different hand gestures. Each of the hand gestures was
evaluated 60 times. For the first 30 times, correct hand gestures were performed. For the remaining 30 times, incorrect
hand gestures were performed. Classification accuracy was
then calculated by (1)-(5).
Supposing that the accuracy of hand gesture A is evaluated,
the following four conditions are checked.
▼▼ A TP prediction is when the user performs hand gesture
A and the application recognizes hand gesture A.
▼▼ An FN prediction is when the user performs hand gesture
A and the application returns other results.
▼▼ A TN prediction is when the user performs other hand
gestures and the application returns other results.
▼▼ An FP prediction is when the user performs other hand
gestures and the application recognizes hand gesture A.
FIGURE 9. The suggested environmental setup.
FIGURE 10. The user interface of our application.
Table 5. The accuracy of our application.
Prediction
Actual
gesture
Clap
Hand Moves
Toward the
Receiver
Hand Moves
Away from
the Receiver
Swipe
"Come
Here"
Not
Recognized
0
0
0
0
0
0
0.1
0
0.77
0.07
0
0
0.07
0.03
0.07
0
0.03
0.83
0
0.03
0
0
0.1
Hand moves toward the receiver
0
0
0
0.77
0.03
0.07
0.03
0.1
Hand moves away
from the receiver
0
0
0.03
0.07
0.8
0.03
0
0.07
Swipe
0
0
0
0.03
0
0.67
0.1
0.2
"Come here"
No
Gesture
Hand is
Vertical
No gesture
0.9
Hand is vertical
Clap
0
0
0
0.03
0
0.03
0.77
0.17
Sensitivity
0.9
0.77
0.83
0.74
0.8
0.67
0.77
−
Specificity
1
0.8
0.87
0.73
0.77
0.57
0.67
−
Positive predictive value
1
0.8
0.87
0.71
0.77
0.61
0.7
−
Negative predictive value
0.91
0.77
0.84
0.76
0.79
0.63
0.74
−
Efficiency/classification
accuracy
0.95
0.78
0.85
0.74
0.78
0.62
0.72
−
MARCH 2018
^
IEEE Consumer Electronics Magazine
81
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