 |
 |
 |
Input Image |
Output Image |
Depth |
 |
 |
 |
Modified Fog Layer |
Refocused |
Refocused |
Single Image Dehazing
Raanan Fattal
In this project we present a new method for estimating the optical
transmission in hazy scenes given a single input image. Based on
this estimation, the scattered light is eliminated to increase scene
visibility and recover haze-free scene contrasts. In this new
approach we formulate a refined image formation model that accounts
for surface shading in addition to the transmission function. This
allows us to resolve ambiguities in the data by searching for a
solution in which the resulting shading and transmission functions
are locally statistically uncorrelated. A similar principle is used
to estimate the color of the haze. Results demonstrate the new
method abilities to remove the haze layer as well as provide a
reliable transmission estimate which can be used for additional
applications such as image refocusing and novel view synthesis.
Results Page
2008 Siggraph paper (12.7MB PDF)
A talk at MSR
VIDEO: refocusing & novel views (17MB AVI)
Information about licensing this technlogy can be found here.
Red Bricks House
|
|
|
Input Image |
Output Image |
Depth |
|
|
|
Modified Fog Layer |
Refocused |
Refocused |
Wheat Cones
 |
 |
 |
Input Image |
Output Image |
Depth Image |
 |
 |
 |
Raw Estimate (before extrap.) |
Refocued |
Shading Component l(x) |
 |
 |
 |
Transmission t(x) |
Extrapolated Trans. |
Certainty (1/Var(sigma_t)) |
Synthetic Example
 |
 |
 |
 |
Input Image |
Transmission t(x) |
Shading l(x) |
Output |
 |
 |
 |
|
Transmission t(x) |
Shading l(x) |
Output |
Aerial & Underwater Photography
 |
 |
 |
Input |
Output |
The airlight-albedo mutual component, Eta (black pixels discarded) |
 |
 |
Input |
Output |
Forest
 |
 |
 |
Input Image |
Output Image |
Denser Fog |
 |
 |
 |
IA(x) |
IR(x) |
h(x) |
People (watching a show)
 |
 |
 |
Input Image |
Output Image |
Refocused |
Mountain
 |
 |
 |
Input Image |
Output Image |
Depth |
Pumpkins
 |
 |
Input Image |
Output Image |
 |
 |
Refocued |
Depth |
Comparisons
Landscape
(Image taken from Schechner et al 2001)
 |
 |
 |
Input Image |
Polarization-Based, Schechner et al. 2001 |
Output (our) |
 |
 |
 |
Dark-Object Subtraction, Chavez 1988 |
Dark-Object Subtraction, Chavez 1988 |
Histogram Equalization |
 |
 |
 |
Multi-Scale Detail Enhancement, Fattal et al. 2007 |
Unsharp Mask |
Gamma Correction |
New York
(Image taken from Schechner et al 2001)
 |
 |
 |
Input Image |
Polarization-Based, Schechner et al. 2001 |
Output (our) |
 |
 |
 |
Dark-Object Subtraction, Chavez 1988 |
Unsharp Mask |
Histogram Equalization |
Additional Fields
 |
 |
 |
Estimated Transmission t(x) |
Extrapolated Trans. |
Certainty (1/Var(sigma_t)) |
 |
 |
 |
IA(x) |
IR(x) |
H(x) |
