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. 2014 Nov 26;9(11):e113083. doi: 10.1371/journal.pone.0113083

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© 2014 Werner et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A. Centered feature-feature similarity matrix according to eq. (6) for the sperm tangent angle data. B. First shape mode for the kernel method (green) compared to the first shape mode as obtained by linear PCA (blue dashed). C. Corresponding shape scores as a function of measurement time for both the kernel method (green) and for linear PCA (blue dashed).

Inline graphic — A. Centered feature-feature similarity matrix according to eq. (6) for the sperm tangent angle data. B. First shape mode for the kernel method (green) compared to the first shape mode as obtained by linear PCA (blue dashed). C. Corresponding shape scores as a function of measurement time for both the kernel method (green) and for linear PCA (blue dashed).