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Proceedings Paper

Multidomain Pixel Analysis for Illuminant Estimation and Compensation
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Paper Abstract

The illuminant estimation has an important role in many domain applications such as digital still cameras and mobile phones, where the final image quality could be heavily affected by a poor compensation of the ambient illumination effects. In this paper we present an algorithm, not dependent on the acquiring device, for illuminant estimation and compensation directly in the color filter array (CFA) domain of digital still cameras. The algorithm proposed takes into account both chromaticity and intensity information of the image data, and performs the illuminant compensation by a diagonal transform. It works by combining a spatial segmentation process with empirical designed weighting functions aimed to select the scene objects containing more information for the light chromaticity estimation. This algorithm has been designed exploiting an experimental framework developed by the authors and it has been evaluated on a database of real scene images acquired in different, carefully controlled, illuminant conditions. The results show that a combined multi domain pixel analysis leads to an improvement of the performance when compared to single domain pixel analysis.

Paper Details

Date Published: 10 February 2006
PDF: 8 pages
Proc. SPIE 6069, Digital Photography II, 60690C (10 February 2006); doi: 10.1117/12.643766
Show Author Affiliations
Arcangelo Bruna, STMicroelectronics (Italy)
Francesca Gasparini, Univ. of Milano-Bicocca (Italy)
Filippo Naccari, STMicroelectronics (Italy)
Raimondo Schettini, Univ. of Milano-Bicocca (Italy)

Published in SPIE Proceedings Vol. 6069:
Digital Photography II
Nitin Sampat; Jeffrey M. DiCarlo; Russel A. Martin, Editor(s)

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