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Adaptive colour constancy algorithm using discrete wavelet transform

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Çelik, Turgay and Tjahjadi, Tardi. (2012) Adaptive colour constancy algorithm using discrete wavelet transform. Computer Vision and Image Understanding, Vol.116 (No.4). pp. 561-571. ISSN 1077-3142

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Official URL: http://dx.doi.org/10.1016/j.cviu.2011.12.004

Abstract

The colours of chromatically homogeneous object surfaces measured by a sensor vary with the illuminant colour used to illuminate the objects. In contrast, colour constancy enables humans to identify the true colours of the surfaces under varying illumination. This paper proposes an adaptive colour constancy algorithm which estimates the illuminant colour from wavelet coefficients at each scale of the decomposition by discrete wavelet transform of the input image. The angular error between the estimated illuminant colours in consecutive scales are used to determine the optimum scale for the best estimate of the true illuminant colour. The estimated illuminant colour is then used to modify the approximation subbands of the image so as to generate the illuminant-colour corrected image via inverse discrete wavelet transform. The experiments show that the colour constancy results generated by the proposed algorithm are comparable or better than those of the state-of-the-art colour constancy algorithms that use low-level image features.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH):	Image processing -- Digital techniques, Wavelets (Mathematics)
Journal or Publication Title:	Computer Vision and Image Understanding
Publisher:	Academic Press
ISSN:	1077-3142
Date:	April 2012
Volume:	Vol.116
Number:	No.4
Number of Pages:	11
Page Range:	pp. 561-571
Identification Number:	10.1016/j.cviu.2011.12.004
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
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URI:	http://wrap.warwick.ac.uk/id/eprint/41296