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Illuminant Chromaticity Estimation via Optimization of RGB Channel Standard Deviation
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 Title & Authors
Illuminant Chromaticity Estimation via Optimization of RGB Channel Standard Deviation
Subhashdas, Shibudas Kattakkalil; Yoo, Ji-Hoon; Ha, Yeong-Ho;
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 Abstract
The primary aim of the color constancy algorithm is to estimate illuminant chromaticity. There are various statistical-based, learning-based and combinational-based color constancy algorithms already exist. However, the statistical-based algorithms can only perform well on images that satisfy certain assumptions, learning-based methods are complex methods that require proper preprocessing and training data, and combinational-based methods depend on either pre-determined or dynamically varying weights, which are difficult to determine and prone to error. Therefore, this paper presents a new optimization based illuminant estimation method which is free from complex preprocessing and can estimate the illuminant under different environmental conditions. A strong color cast always has an odd standard deviation value in one of the RGB channels. Based on this observation, a cost function called the degree of illuminant tinge(DIT) is proposed to determine the quality of illuminant color-calibrated images. This DIT is formulated in such a way that the image scene under standard illuminant (d65) has lower DIT value compared to the same scene under different illuminant. Here, a swarm intelligence based particle swarm optimizer(PSO) is used to find the optimum illuminant of the given image that minimizes the degree of illuminant tinge. The proposed method is evaluated using real-world datasets and the experimental results validate the effectiveness of the proposed method.
 Keywords
Color constancy;Illuminant estimation;Particle swarm optimization;Color cast;Optimization;
 Language
English
 Cited by
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