1. Correcting Over-Exposure in Photographs
Dong Guo, Yuan Cheng, Shaojie Zhuo, Terence Sim. IEEE Conf. on Computer Vision and Pattern Recognition (CVPR), San Francisco, 2010

2. Correcting Over-Exposure in Photographs
Problems with overexposed areas
Pixels receiving “too much” irradiance record almost white colors
Color information is distorted (desaturated)
Information is lost

3. Correcting Over-Exposure in Photographs
Main Contribution
Works with one single image
Does not require user interaction

4. Correcting Over-Exposure in Photographs
General Workflow
Create a map of overexposed pixels
Compress the dynamic-range in well-exposed areas
Recover the lightness
Correct the color

5. Correcting Over-Exposure in Photographs
General Workflow
Create a map of overexposed pixels

6. Correcting Over-Exposure in Photographs
General Workflow
2. Compress the dynamic-range in well-exposed areas
Analogue to Fattal’s method (2002)
One among many other Tone Mapping methods

7. Correcting Over-Exposure in Photographs
General Workflow
3. Recover the lightness
E1: Compress the dynamic range (Fattal’s method)
E2: Retain luminance in overexposed areas
Constraint: keep very low light areas unchanged.

8. Correcting Over-Exposure in Photographs
General Workflow
4. Correct the color
\Psi: Color confidence = 1 - M
First term: extract color from neighbors in overexposed areas (=> propagation from good pixels)
Second term: keep the same color in well exposed areas

9. Correcting Over-Exposure in Photographs
Results

10. Correcting Over-Exposure in Photographs
Interesting references:

11. Correcting Over-Exposure in Photographs
Interesting references:
ANAT LEVIN’s work:
A. Levin D. Lischinski and Y. Weiss. A Closed Form Solution to Natural Image Matting. IEEE Trans. Pattern Analysis and Machine Intelligence, Feb 2008
Powerful technique already used for:
Alpha Matting, White Balance, Ghost Removal, Tone Mapping, Haze Removal
Not directly cited in the paper

12. Correcting Over-Exposure in Photographs
Interesting references:
High Dynamic Range Imaging: Acquisition, Display, and Image-Based Lighting
(The Morgan Kaufmann Series in Computer Graphics)
Not directly cited in the paper