Active Contouring

Xianghua Xie

(Swansea University, CS)

Deformable contour models or snakes are commonly used in image
processing and computer vision due to their natural handling of shape
variation and independence of operation (once initialised). Although
significant improvements have been made in this field over the last
decade, there are still great challenges in handling weak edges, image
noise, and complex topologies and geometries which often occur in
real world images.
In this talk, we will examine the three fundamental issues in designing
an active contour model, namely contour representation and its
numerical solution, object boundary description and stopping function
design, and initialisation and convergence. The speaker will show how
we can enhance the performance of active contour models, such as
handling weak edges and improving initialisation invariancy, through
designing novel external force field. A novel contour representation
method which transfers difficult PDE problem to simpler ODE problem
will also be presented. More sophisticated topological changes are now
readily achievable. A couple of applications to medical image analysis
of the active contours will be briefly discussed as well.
Tuesday 4th December 2007, 14:00
Robert Recorde Room
Department of Computer Science