Improving Image Contrast using Polarization Light Stripe Scanning Mohit Gupta Srinivasa G Narasimhan Yoav Y Schechner Polarized flood lighting Unpolarized light striping Polarized ID: 286021
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Slide1
On Controlling Light Transport in Poor Visibility Environments
Improving Image
Contrast using Polarization + Light
Stripe Scanning
Mohit
Gupta
Srinivasa
G.
Narasimhan
Yoav Y. Schechner
Polarized
flood lighting
Unpolarized
light striping
Polarized
light striping
Strong
scattering
Increasing image contrast
Where to Place the Camera and the
Source for the Best Image Quality?
Small camera-source separation
Large camera-source separation
OR
?
High contrast High noise
Low contrast Low noise
Optimal separation
The
optimal separation for
flood-lighting
Image
contrast
SNR
Large
separation
High noise
Image
quality
versus separation
Flood
lighting
Polarized
light striping
Comparison
No post-processing
Increasing image contrast
How to Illuminate
the Scene in Poor Visibility Environments?
Light Transport in Scattering Media
1. Flood Lighting
Floodlit
(Low contrast)
Object
2. High-frequency Illumination [
Nayar
et al]
Global
(Low contrast)
Direct
(High noise)
3.
Confocal
Imaging [
Levoy
et al]
Synthetic aperture
Scanning
Coded aperture
4. Light
Stripe
Scanning [
Narasimhan
et al]
Light
striping input
Less backscatter
Increased contrast
Signal S(
x,y
)
Backscatter
Treibitz
et al, CVPR06
edsphotoblog.com
Backscatter degrades visibility
Unpolarized
vs. Polarized Light Striping
The
optimal
light stripe scan
Image
from
the optimal scan
Delineation of light-plane
stripe
Image
quality
versus separation
Rotating
Translating
Combination
Unpolarized
light stripe
Polarized light stripe
Difference
Removed backscatter