A 3D-polar coordinate colour representation well adapted to image analysis

Authors:
Allan Hanbury
Affiliations:
Vienna University of Technology, Vienna, Austria
Venue:
SCIA'03 Proceedings of the 13th Scandinavian conference on Image analysis
Year:
2003

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Abstract

Representations of the RGB space in terms of 3D-polar co-ordinates (hue, saturation and brightness) are often used in image analysis. The literature describes a large number of similar coordinate systems (HLS, HSV, etc.). We show that the read, on for the existence of so many systems is a poor definition of the saturation coordinate which makes it dependent on the brightness function used: and hence poorly suited to image analysis applications. An improved saturation measurement which (1) always has small values for achromatic colours and (2) is independent of the brightness function is derived.