Detalle de: A new chromatic encoding for machine vision invariant to the change of illuminant

The human visual system is adapted to assign constant chromatic attributes to objects in spite of the alterations in spectral distribution of the illuminant or the spatio-chromatic arrangement of the visual field. This visual capacity is called colour constancy. However, artificial vision systems do not usually have this ability. So, when these vision systems operate outdoors for example, chromatic codification errors are usually very significant. Basing ourselves on the theories about colour constancy in the human visual system, fundamentally in the principles of the Retinex theory, in this work we have implemented an algorithm for colour constancy. For this, we propose some new colour-descriptors for a stimulus, practically invariant to the spectral change of the illuminant. Finally, we check experimentally the statistical stability of these colour-descriptors, corresponding to standard colour samples (Munsell chips), against a range of standard illuminants, as well as their validity rank.