On the uniform sampling of CIELAB color space and the number of discernible colors

Jean-Baptiste Thomas (1) , Philippe Colantoni (2) , Alain Trémeau (3)

1 Le2i - Laboratoire Electronique, Informatique et Image [UMR6306]
2 C2RMF - Centre de recherche et de restauration des musées de France
3 LHC - Laboratoire Hubert Curien

This paper presents a useful algorithmic strategy to sample uniformly the CIELAB color space based on close packed hexagonal grid. This sampling scheme has been used successfully in different research works from computational color science to color image processing. The main objective of this paper is to demonstrate that the number of color samples computed is dependent of the color gamut boundary considered and that the number of discernible color can be set to the JND. The second objective of this paper is to demonstrate the relevance and the accuracy of the hexagonal grid sampling method applied to the CIELAB color space.

Mots clés: Sampling; 3D close packed hexagonal grid; perceptually uniform color space; computational color imaging

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Jean-Baptiste Thomas, Philippe Colantoni, Alain Trémeau. On the uniform sampling of CIELAB color space and the number of discernible colors. CCIW 2013, Mar 2013, Chiba, Japan. ⟨hal-00759316⟩