Retinex at 40

Retinex at 50: color theory and spatial algorithms, a review

Retinex Imaging shares two distinct elements: first, a model of human color vision; second, a spatialimaging algorithm for making better reproductions. Edwin Land’s 1964 Retinex Color Theory began as a model of human color vision of real complex scenes. He designed many experiments, such as Color Mondrians, to understand why retinal cone quanta catch fails to predict color constancy. Land’s Ret...

Retinex in MATLABTM

Many different descriptions of Retinex methods of lightness computation exist. We provide concise MATLABTM implementations of two of the spatial techniques of making pixel comparisons. The code is presented, along with test results on several images and a discussion of the results. We also discuss the calibration of input images and the postRetinex processing required to display the output imag...

Retinex in Matlab

Many different descriptions of retinex methods of lightness computation exist. This paper provides concise MATLAB implementations of two of the spatial techniques of making pixel comparisons. The code is presented along with test results on several images and a discussion of the results. The paper also discusses the calibration of input images and the post-retinex processing required to display...

Tuning Retinex parameters

Our goal is to specify the retinex model as precisely as possible. The core retinex computation is clearly specified in the recent MATLAB implementation; however, there remain several free parameters which introduce significant variability into the model’s predictions. In this paper, we extend previous work on specifying these parameters. In particular, instead of looking for fixed values for t...

Lightness and retinex theory.