Comparative Zoology - Evolutionary Changes in Shape and Stratification of Crabs
Shape Morphing for Psychological Experiments
A common theory in psychology assumes that mental representations of objects are used during the object recognition process of humans. These representations are flexible and can change due to new information (for example an input stimulus). This effect is called adaptation effect and was shown for the recognition of human faces. Now, the adaptation effect is studied for the categorization of biological objects, namely crabs and lobsters. Until now, simple 2D images showing an interpolation from crab to lobster have been used for psychological tests. The goal of this work is to morph between 3D surface models of a crab and a lobster from given CT scans. Controlled experiments require that only one part (for example the carapax) of the animal is changed, thus we need local instead of global mesh morphing.
- Preprocessing and segmentation of a crab and a lobster in given CT scans
- Generation of a smooth manifold surface
- Patchification of the two surfaces into corresponding areas that are homeomorphic to a disc
- Creation of surface correspondence: Each patch is parameterized to the unit disc using a convex combination map
- (Local) surface interpolation to create sensible intermediate surfaces using Poisson interpolation