On Colour Spaces for Change Detection and Shadow Suppression
Philipp Blauensteiner, Horst Wildenauer, Allan Hanbury, Martin Kampel · 2006
In this paper, common colour models for back- ground subtraction and problems related to their utilisation are discussed. A novel approach to represent chrominance information more suitable for robust background modelling and shadow suppression is proposed. Our method relies on the ability to represent colours in terms of a 3D-polar coor- dinate system having saturation independent of the bright- ness function; specifically, we build upon an Improved Hue, Luminance, and Saturation space (IHLS). The additional peculiarity of the approach is that we deal with the problem of unstable hue values at low saturation by modelling the hue-saturation relationship using saturation-weighted hue statistics. The effectiveness of the proposed method is shown in an experimental comparison with an approach based on normalised RGB.