M.I.T. Media Laboratory Vision and Modeling Group Technical Report No. 198
On the use of ``Nulling'' Filters to Separate Transparent Motions
Trevor Darrell and Eero Simoncelli
Transparent motions can be isolated in the Fourier domain, using derivative
prefilters that selectively null the spatio-temporal energy consistent with
the gradient constraint imposed by each component velocity. We use these
``nulling'' prefilters to robustly compute the support a particular velocity
has at a point despite other velocities that may also be present at that
point. Images are decomposed into a set of global constraints that account
for a maximal amount of the motion information in the sequence. Adopting
global motion hypotheses and a selection mechanism based on finding a parsimonious
subset of these hypotheses, we show results separating motion stimuli into
their constituent layers, even when those layers are transparently combined
in the stimuli.
version of this report is available.