Mathematical Morphology Applied to the Analysis of Lighting Conditions of Color Images

28/03/02

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Summary

Title

Objective

Presentation's plan

First part : Introduction to the problematic

Why the lighting conditions ?

The light : essential image component

Lighting conditions : temporal cue

Lighting conditions : spatial cue

Lighting conditions : define the image quality

The nature of the light

Geometric and spectral aspect of the light

Photometric and colorimetric aspect of the light

Common light sources

Locus of planckian radiators

Color information : how can it help ?

Spectral integration

The dichromatic reflection model

Light reflection : Transmission

Light reflection : Absorption

Light reflection : Reflection

Light reflection : Geometrical aspect

Light reflection : Spectral aspect

Body reflection / Surface reflection

The dichromatic plane

Photometric characterization of the lighting conditions

Shadow detection

Reflectance edge / Luminance edge

Detection cues

The shadow and the dichromatic reflection model

The algorithm 1

The algorithm 2

The algorithm 3

The algorithm 4

Results (Strong direct light)

Results (Direct light with ambient light)

Results (Ambient light)

Global luminance contrast measurement

Comparing the luminance contrast of two images

Sky detection

Types of sky (1)

Types of sky (2)

Types of sky (3)

Visual perception cues

Algorithm (1)

Algorithm (2)

Algorithm (3)

Algorithm (4)

Algorithm (5)

Results (Distinction sky / sea)

Results (Distinction sky / blue paint)

Results (Detecting a mixed)

Results (Detecting a covered sky)

Detection statistics

Classification according to the chrominance signal

Detecting the illuminant's chrominance

Dichromatic plane / dichromatic line / Dichromatic convergence

Color segmentation advantages

Regions filtering

Chromatic convergence determination

Results

Results

Conclusions

Conclusions

Conclusions

Conclusions

Perspectives

End

Author:Valéry RISSON 

Mail: risson@cmm.ensmp.fr

Home Page: http://cmm.ensmp.fr/~risson/index_ang.html