Unsupervised corrections of unknown chromatic dominants using a Brownian-path-based Retinex algorithm

An experimental analysis of chromatic equalization based on a new implementation of the Retinex algorithm is pre- sented. The experiments are carried out on a colored Mondrian patchwork illuminated with different commercial light sources and on synthetic images generated with a photometric ray tracer using dif- ferent illuminants. Regarding the Mondrian patchwork, the spectral characteristics of the bulbs and the reflected light from each patch are measured using a commercial spectrometer. From the mea- sured data, synthetic images of the patchwork with different illumi- nants are created and processed by the Retinex algorithm. The chromatic correction capabilities of the Retinex implementation have been measured and compared with unfiltered values and with the results of another Retinex implementation and classic color equal- ization algorithms. Results show that Retinex performs an unsuper- vised color correction without requiring any information about the spectral composition of the illuminant. © 2003 SPIE and IS&T.

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