A compressive approach to light field synthesis with projection devices. We propose a novel, passive screen design that is combined with high-speed light field projection and nonnegative light field factorization. We demonstrate that the projector can alternatively achieve super-resolved and high dynamic range 2D image display when used with a conventional screen.
AWS Community Day CPH - Three problems of Terraform
Compressive Light Field Projection @ SIGGRAPH 2014
1. A Compressive
Light Field Projection System
Matthew Hirsch1* Gordon Wetzstein1,2* Ramesh Raskar1
1MIT Media Lab
2now at Stanford University
*equal contribution
26. gt ¬ gt
FT
(bl (Yht ))
FT
(l (Yht ))+e
ht ¬ ht
YT
(bl (Fgt ))
YT
(l (Fgt ))+e
minimize bl - (Fgt ) (Yht )
t
å 2
subject to 0 £ g,h £1
l(x,u) = g(f(x,u)) h(y(x,u))
Top View
g h
YF
l
=
Light Field
l(x,u) g(f(x,u))
h(y(x,u))
t
å
vertical diffuser
inversion
Side View
tt
perceptual integration
convolution (diffusion &
aberrations)
27.
28.
29.
30.
31. Flexible Display Modes – Superresolution and HDR
conventional
screen
LightFieldProjector
projected signal
cos ( fg x )
cos ( fh x )
0.5 ( cos ( (fg+fh ) x) + cos ( (fg-fh ) x) )
32.
33. More Details in the Paper & Supplement!
Matlab Source Code &
OpenGL Pseudo-Code
Compressibility
Convergence
Optics
35. Limitations
• Color projection (e.g. multiple devices)
• Screen
• More angle expansion
• Larger size
• Less scattering and aberrations
36. A Compressive Light Field Projection System
Matthew Hirsch Gordon Wetzstein Ramesh Raskar
media.mit.edu/~gordonw/CompressiveLightFieldProjector/
See demo at Emerging Technologies!
Thanks to: Hisham Bedri, Silicon Micro Display, Vincent Lee,
Matthew O’Toole, Phil Surman