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SUMMARY:Optical Flow on Evolving Sphere-Like Surfaces - Lukas Lang (Univer
 sity of Vienna)
DTSTART:20161101T150000Z
DTEND:20161101T160000Z
UID:TALK68842@talks.cam.ac.uk
CONTACT:Carola-Bibiane Schoenlieb
DESCRIPTION:In this talk we will consider optical flow on evolving surface
 s which can be parametrised from the 2-sphere. Our main motivation is to e
 stimate cell motion in time-lapse volumetric (4D) microscopy images depict
 inguorescently labelled cells of a live zebrafish embryo. We exploit the f
 act that the recorded cells float on the surface of the embryo and allow f
 or the extraction of a two-dimensional image sequence together with a surf
 ace parametrisation. The variational optical flow problem is then solved w
 ith a Galerkin method based on tangent vector spherical harmonics. Finally
 \, we present numerical results and discuss recent efforts.\nThis is joint
  work with Otmar Scherzer.
LOCATION:MR 14\, Centre for Mathematical Sciences
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