The invariance properties of chromatic characteristics

Authors:
Yun-Chung Chung;Shyang-Lih Chang;Shen Cherng;Sei-Wang Chen
Affiliations:
Department of Computer Science and Information Engineering, National Taiwan Normal University, Taiwan;Department of Electronic Engineering, St. John's University, Taiwan;Department of Electrical Engineering, Cheng Shiu University, Taiwan;Department of Computer Science and Information Engineering, National Taiwan Normal University, Taiwan
Venue:
PSIVT'06 Proceedings of the First Pacific Rim conference on Advances in Image and Video Technology
Year:
2006

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Abstract

An approach to analyzing the degrees of invariance of chromatic characteristics is proposed in this paper. In many vision applications, it is desirable that the chromatic characteristics of objects in images taken under different lighting conditions could remain constant. However, the invariance properties of chromatic characteristics are subject to the lighting conditions. In order to be able to apply to dynamic scenes, we consider three fundamental lighting sources: diffuse, ambient, and directed lightings. Any illumination condition can be approximated as a combination of the three lighting sources. The proposed degree of chromatic invariance is defined based on the chromatic characteristic behaviors under different illumination conditions. A lot of image samples under different illumination conditions are utilized, and from experimental results, we conclude that chromatic characteristics {H, C, Cλ} are most stable and suitable for the vision applications.