Applying Visual Object Categorization and Memory Colors for Automatic Color Constancy

Authors:
Esa Rahtu;Jarno Nikkanen;Juho Kannala;Leena Lepistö;Janne Heikkilä
Affiliations:
Machine Vision Group, University of Oulu, Finland;Nokia Corporation, Tampere, Finland 33720;Machine Vision Group, University of Oulu, Finland;Nokia Corporation, Tampere, Finland 33720;Machine Vision Group, University of Oulu, Finland
Venue:
ICIAP '09 Proceedings of the 15th International Conference on Image Analysis and Processing
Year:
2009

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Abstract

This paper presents a framework for using high-level visual information to enhance the performance of automatic color constancy algorithms. The approach is based on recognizing special visual object categories, called here as memory color categories, which have a relatively constant color (e.g. the sky). If such category is found from image, the initial white balance provided by a low-level color constancy algorithm can be adjusted so that the observed color of the category moves toward the desired color. The magnitude and direction of the adjustment is controlled by the learned characteristics of the particular category in the chromaticity space. The object categorization is performed using bag-of-features method and raw camera data with reduced preprocessing and resolution. The proposed approach is demonstrated in experiments involving the standard gray-world and the state-of-the-art gray-edge color constancy methods. In both cases the introduced approach improves the performance of the original methods.