Image Analysis and Computer Graphics > Research > Geometric Modelling

Geometric Modelling

Intuitive, Interactive Shape Modelling

The bear is represented as a distance field volume created using CaVE - our Level-Set based volume sculpting system. Interactive modelling of 3D shapes on a computer should be as simple and intuitive as doodling 2D shapes using pencil and paper. Simpler, in fact, since on a computer changes can always be undone, and the user is more free to explore and experiment. Unfortunately, completely intuitive, interactive modelling of shapes seems to be an elusive goal. Some researchers attack the problem of intuitive sculpting from a user interface perspective. Perhaps the best example is the well-known gesture-based system, Teddy, by Takeo Igarashi. It seems likely that by a careful design of user friendly interfaces, we can come a long way towards intuitive sculpting, but, unfortunately, it also seems that the underlying representation will be an obstacle - simply because effective modelling often requires the user to be aware of the parameters of the representation. The goal of this project is to explore new methods for shape modelling that allow the user to be completely unaware of the underlying representation so that she can focus solely on the task of modelling. Inroads have been made, using the volume representation in conjunction with the Level-Set Method. Future challenges involve handling high resolution detail and adaptive resolution. We are also looking into the application of shape modelling techniques to surgery planning. This is also a part of the "Visualization and Manipulation of Medical Data" project discussed elsewhere. more

Contact: Andreas Baerentzen

Structure from Motion

The topic of this project is structure from motion, i.e. the inference of 3D structure of a usually rigid object from normal images hereof. The primary focus is on:

1) the statistical issues regarding this highly popular problem, i.e. robust statistics and the including of prior knowledge.

2) The extension to dealing with non-rigid objects.

3) The estimation of how the objects surface, once a crude structure and camera motion have been estimated.

Contact: Henrik Aanęs