A toolkit for the dynamic study of air sacs in siamang and other elastic circular structures
Fig 6
Automatically tracked radii in comparison to manually labeled radii for both approaches: DLC+ and Hough Transform.
A) Comparison of DLC+ trackings and manual tracking of air sac radii, both in pixel units, for a set of > 1000 frames from nine different video scenes. Perfect fit would mean r = 1.0 and direct match in pixels. We find that the DLC+ radii match very well with the manual trackings, r = 0.86, as calculated on all frames over nine videos. B) Comparison of Hough Transform tracking and manual tracking for the same set of > 1000 frames. The correlation coefficient (r) for the nine test videos was 0.23. Parameters can be optimized for each video specifically, and when set adequately for individual videos, we see correlations close to the one for DLC+ trackings. As a trendline, in turquoise, we see the second-best correlation for one video with r = 0.53; in red, the best correlation with r = 0.8.