A resistant method for landmark-based analysis of individual asymmetry in two dimensions
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- 作者：Sebastián Torcida ; Paula Gonzalez ; Federico Lotto
- 关键词：resistant procrustes method ; shape asymmetry ; matching and object symmetry ; landmarks
- 刊名：Quantitative Biology
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：4
- 期：4
- 页码：270-282
- 全文大小：1245KB
- 刊物主题：Bioinformatics; Computational Biology/Bioinformatics; Computer Appl. in Life Sciences; Mathematical and Computational Biology;
- 出版者：Higher Education Press
- ISSN：2095-4697
- 卷排序：4
文摘
BackgroundSymmetry of biological structures can be thought as the repetition of their parts in different positions and orientations. Asymmetry analyses, therefore, focuses on identifying and measuring the location and extent of symmetry departures in such structures. In the context of geometric morphometrics, a key step when studying morphological variation is the estimation of the symmetric shape. The standard procedure uses the least-squares Procrustes superimposition, which by averaging shape differences often underestimates the symmetry departures thus leading to an inaccurate description of the asymmetry pattern. Moreover, the corresponding asymmetry values are neither geometrically intuitive nor visually perceivable.