Berlin : Weierstraß-Institut für Angewandte Analysis und Stochastik
Doi
Abstract
Optical imaging in biomedicine is governed by the light absorption and
scattering interaction on microscopic and macroscopic constituents in the
medium. Therefore, light scattering characteristics of human tissue
correlates with the stage of some diseases. In the near infrared range the
scattering event with the coefficient approximately two orders of magnitude
greater than absorption plays a dominant role. The potential of an
experimental laser diode based setup for the transillumination of rheumatoid
finger joints and the pattern of the stray light detection are demonstrated.
For evaluating the scattering light images a new non-local image segmentation
method is presented. Regarding a noisy picture as a multicomponent mixture of
gray scaled particles, this method minimizes a non-convex free energy
functional under the constraint of mass conservation of the components.
Contrary to constructing equilibrium distributions as steady states of an
adequate evolution equation, a direct descent method for the free energy is
used to separate the components of the image