Udi Pfeffer (CS, Technion)
Wednesday, 14.7.2010, 11:30
We introduce a system for hyperspectral imaging based on
micro-mirror array, that projects subsets of image pixels onto a prism
(or diffraction grating), followed by a CCD-type sensor. This system
allows generalized sampling schemes including compressed sensing. We
acquire only a fraction of the samples that are required to obtain the
full-resolution signal (hyperspectral cube in our case), and by means
of non-linear optimization recover the underlying signal. We use a
prior knowledge about the signal sparsity in some dictionary, and
its limited total variation. We also introduce additional measurements
of full-resolution image using small number of filters similar to RGB.
As a result, we obtain a feasible system for hyperspectral imaging
that enables faster acquisition compared to traditional sampling systems.
We present sensitivity analysis of our system to dark and shot noise.
*M.Sc thesis seminar under the supervision of Prof. Ehud Rivlin and Dr.