Database Reference
In-Depth Information
Table 3. Results using the video tracking data some
values of sample size s and δ .
Distance function
Time (sec)
Correct clusterings
(out of 10)
complete linkage
Euclidean
31.28
2
DTW
227.162
5
S 2:
s-5%, δ -25%
2.645
8.45
s-10%, δ -25%
8.240
9.85
s-15%, δ -25%
15.789
10
s-20%, δ -25%
28.113
10
Fig. 15. Time required to compute the pairwise distance computations for various sam-
ple sizes and values of δ .
sign one the 95 words of the ASL. These series are relatively short
(50-100 points). We used only the X coordinates and collected 5 recordings
of the following 10 words: 'Norway', 'cold', 'crazy', 'eat', 'forget', 'happy',
'innocent', 'later', 'lose', 'spend' . This is the experiment conducted also in
[27]. Examples of this dataset can be seen in Figure 17.
In this experiment all distance functions do not depict significant clus-
tering accuracy, and the reason is that we used only 1 parameter out of
the possible 10. Therefore accuracy is compromised. Specifically, the per-
formance of the LCSS in this experiment is similar to the DTW (both rec-
ognized correctly 20 clusters). So both present equivalent accuracy levels,
which is expected, since this dataset does not contain excessive noise and
 
Search WWH ::




Custom Search