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. Author manuscript; available in PMC: 2011 Aug 24.

Published in final edited form as: Comput Med Imaging Graph. 2008 Sep 19;32(8):670–677. doi: 10.1016/j.compmedimag.2008.08.003

Table 1.

Description of the color features

Feature Group

Description

F_{1} = \frac{R_{L}}{R_{L} + G_{L} + B_{L}}; F_{2} = \frac{G_{L}}{R_{L} + G_{L} + B_{L}}; F_{3} = \frac{B_{L}}{R_{L} + G_{L} + B_{L}}

Chromaticity Coordinates

F_{4} = \frac{R_{L}}{R_{S}}; F_{5} = \frac{G_{L}}{G_{S}}; F_{6} = \frac{B_{L}}{R_{S}}

Relative R, G, B Ratio

F_{7} = \frac{F_{4}}{F_{4} + F_{5} + F_{6}}; F_{8} = \frac{F_{5}}{F_{4} + F_{5} + F_{6}}; F_{9} = \frac{F_{6}}{F_{4} + F_{5} + F_{6}}

Normalized Relative R, G, B Ratio

F_{10} = R_{L} - R_{S}; F_{11} = G_{L} - G_{S}; F_{12} = B_{L} - B_{S}

Relative R, G, B Difference

F_{13} = \frac{F_{10}}{F_{10} + F_{11} + F_{12}}; F_{14} = \frac{F_{11}}{F_{10} + F_{11} + F_{12}}; F_{15} = \frac{F_{12}}{F_{10} + F_{11} + F_{12}}

Normalized Relative R, G, B Difference