Issues About Retinex Theory and Contrast Enhancement

  title={Issues About Retinex Theory and Contrast Enhancement},
  author={Marcelo Bertalm{\'i}o and Vicent Caselles and Edoardo Provenzi},
  journal={International Journal of Computer Vision},
AbstractWe present an interpretation of Land’s Retinex theory that we show to be consistent with the original formulation. The proposed model relies on the computation of the expectation value of a suitable random variable weighted with a kernel function, thus the name Kernel-Based Retinex (KBR) for the corresponding algorithm. KBR shares the same intrinsic characteristics of the original Retinex: it can reduce the effect of a color cast and enhance details in low-key images but, since it can… 

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It is proved that if the paths are assumed to be symmetric random walks, the Retinex solutions satisfy a discrete Poisson equation and this formalization yields an exact and fast implementation using only two FFTs.

Achromatic Induction: A Variational Interpretation of Rudd-Zemach's Edge Integration Model

  • E. Provenzi
  • Computer Science
    2013 International Conference on Signal-Image Technology & Internet-Based Systems
  • 2013
Rudd-Zemach's edge integration model is examined and it is shown that it can be interpreted in terms of a variational framework that shares many features with a phenomenologically-based visual perception theory recently proposed, opening the possibility to determine important parameters of this framework.

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Non-Local Retinex - A Unifying Framework and Beyond

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A Local Flatness Based Variational Approach to Retinex

The experimental results show that the new approach to digitally implementing the Retinex using a local deviation based variational model can reconstruct more accurate recovered images than other state-of-the-art methods, while maintaining good contrast.

A parallel operator splitting algorithm for solving constrained total-variation retinex

A parallel operator splitting algorithm tailored for the constrained total-variation retinex model, in which all the resulting subproblems admit closed form solutions or can be tractably solved by some subroutines without any internally nested iterations is developed.

A Retinex model based on Absorbing Markov Chains




A Variational Framework for Retinex

A variational model for the Retinex problem that unifies previous methods and shows that the illumination estimation problem can be formulated as a Quadratic Programming optimization problem.

A Spatially Variant White-Patch and Gray-World Method for Color Image Enhancement Driven by Local Contrast

It is shown that the combination of a pure WP algorithm (RSR: random spray Retinex) and an essentially GW one (ACE) leads to a more robust and better performing model (RACE), which has a general applicability to perceptually inspired color correction algorithms.

A multiscale retinex for bridging the gap between color images and the human observation of scenes

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We present a comparison between two color equalization algorithms: Retinex, the famous model due to Land and McCann, and Automatic Color Equalization (ACE), a new algorithm recently presented by the

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A practical implementation of the retinex is defined without particular concern for its validity as a model for human lightness and color perception, and the trade-off between rendition and dynamic range compression that is governed by the surround space constant is described.

Analysis and extensions of the Frankle-McCann Retinex algorithm

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This paper proposes a novel image functional whose minimization produces a perceptually inspired color enhanced version of the original, and shows that a numerical implementation of the gradient descent technique applied to this energy functional coincides with the equation of automatic color enhancement (ACE), a particular perceptual-based model of color enhancement.

A computational approach to color adaptation effects

Lightness and retinex theory.

The mathematics of a lightness scheme that generates lightness numbers, the biologic correlate of reflectance, independent of the flux from objects is described.

Formal connections between lightness algorithms.

  • A. Hurlbert
  • Computer Science, Mathematics
    Journal of the Optical Society of America. A, Optics and image science
  • 1986
This paper clarifies and formalizes the lightness problem by proposing a new formulation of the intensity equation on which lightness algorithms are based and by identifying and discussing two basic subproblems of lightness and color computation: spatial decomposition and spectral normalization of theintensity signal.