-[Monica Jane Emerson, Ying Wang, Philip John Withers, Knut Conradsen, Anders Bjorholm Dahl, Vedrana Andersen Dahl (2018): Quantifying fibre reorientation during axial compression of a composite through time-lapse X-ray imaging and individual fibre tracking. Composites Science and Technology, 168, pp. 47–54](https://orbit.dtu.dk/files/152923093/1_s2.0_S0266353818309837_main.pdf), and
-[Monica Jane Emerson, Vedrana Andersen Dahl, Knut Conradsen, Lars Pilgaard Mikkelsen,Anders Bjorholm Dahl (2018): Statistical validation of individual fibre segmentation from tomograms and microscopy. Composites Science and Technology 160, pp. 208–215](https://orbit.dtu.dk/files/145957268/validation_postprint.pdf).
Highlight: Statistical Shape Analysis and Geometric Morphometry.
In biology, analysis of shape based on landmarks has become a versatile tool in investigating evolution and relations between populations of different organisms. Traditionally, 3D-landmarks have been obtained using a tactile digitizer arm. En route to automating this, we have made 3D digital models of the surfaces of grey seal sculls and subsequently annotated those using a mouse and a 2D display. However, landmark annotation of a 3D model on a 2D display is tedious and may thus introduce errors. Furthermore, it can be more time-consuming than direct annotation on the physical object using a digitizer arm. Therefore, we as an alternative to the flat screen annotation introduce a virtual reality (VR) prototype for annotating landmarks on 3D models. The studies involved thorough statistical analyses among others using different ANOVA models to compare operators, methods, determining intra- and inter species variation etc.
A specific biological result has been that in a further study of the data and models generated, it was concluded that the separate subspecies status of the Baltic and Atlantic grey seals is questionable from a morphological point of view.
Checkpoints for digital landmark placement (using the Stratovan Checkpoint software), and to the right the 31 landmarks used.
For more information see
A. Galatius, M.S. Svendsen, D. Messer, M. Valtonen, M. McGowen, R. Sabin. V.A. Dahl, A.B. Dahl, and M.T. Olsen (2022): Range-wide variation in grey seal (Halichoerus grypus) skull morphology.. Zoology 153 (2022)126023. https://doi.org/10.1016/j.zool.2022.126023
D. Messer (2022): 3D shape analysis for morphometrics - Based on structured light optical scanning. Technical University of Denmark. https://orbit.dtu.dk/en/publications/3d-shape-analysis-for-morphometrics-based-on-structured-light-opt.
D. Messer, M.S. Svendsen, A. Galatius, M.T. Olsen, V.A. Dahl, K. Conradsen, and A.B. Dahl (2021): Measurement error using a SeeMaLab structured light 3D scanner against a Microscribe 3D digitizer. PeerJ 9:e11804. http://doi.org/10.7717/peerj.11804
D .Messer, M. Atchapero, M.B. Jensen, M.S. Svendsen, A. Galatius, M.T. Olsen, J.R. Frisvad, V.A. Dahl, K. Conradsen, A.B. Dahl, and A. Bærentzen (2022): Using virtual reality for anatomical landmark annotation in geometric morphometrics. PeerJ 10:e12869. http://doi.org//10.7717/peerj.12869
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## People
- Anders Nymark Christensen [anym@dtu.dk](mailto:anym@dtu.dk) [https://orbit.dtu.dk/en/persons/anders-nymark-christensen](https://orbit.dtu.dk/en/persons/anders-nymark-christensen)
