1
National Tsing Hua University, Department of Electrical Engineering 2 National Taiwan University, Graduate Institute of
Electronics Engineering
Abstract
Digital refocusing for
sparsely sampled light fields results in aliasing effect. For realistic
quality, previous works performed anti-aliasing by applying
time-consuming view interpolation for a heuristic number of novel views.
In this paper, we study this problem by first performing a spectral
analysis to give an analytical rule for the novel view number, which
saves 34% of views compared to the intuitional choice. Then we propose a
fast refocusing algorithm using a view interpolation method which is
about 30x faster than VSRS-1D-Fast. Experimental results show the
effectiveness of our approach in terms of speed and quality. For showing
realistic refocusing, a light-field wafer-level-optics array is
implemented, and its refocused images are compared to pictures captured
by a real camera.
Publications
"Fast Realistic Refocusing for Sparse
Light Fields," Proc. ICASSP, 2015.
[preprint,
5.5MB]
Experimental Refocusing Results
Move mouse
on the refocused images to activate GIF animation for
viewing dynamic refocusing effect
This work was
supported by the Ministry of Science and Technology, Taiwan,
R.O.C. under Grant no. MOST 103-2218-E-007-008-MY3. The authors
thank Himax Technologies, Inc., for providing wafer-level
optics.