Improving Color Constancy in the Presence of Multiple Illuminants using Depth Information

Marc Ebner, Johannes Hansen

2014

Abstract

A human observer is able to judge the color of objects independent of the illuminant. In contrast, a digital sensor (or the retinal receptors for that matter) only measure reflected light which varies with the illuminant. The brain is somehow able to compute a color constant descriptor from the light falling onto the retina. We have improved a well known color constancy algorithm based on local space average color. This color constancy algorithm can be mapped to the different visual processing stages of the human brain. We have extended this algorithm by incorporating depth information. The idea is that wherever there are depth discontinuities there may also be a change of the illuminant in the image. Hence, depth discontinuities are used to separate different illuminants. This allows us to better estimate the local illumination and allows us to compute an improved color constant descriptor. We also compute local space average depth to decide locally whether to average data from retinal sensors uniformly or non-uniformly. We show how our algorithm works on real world scenes. Depth information is obtained from a standard Kinect sensor.

Paper Citation

in Harvard Style

Ebner M. and Hansen J. (2014). Improving Color Constancy in the Presence of Multiple Illuminants using Depth Information . In Proceedings of the International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2014) ISBN 978-989-758-011-6, pages 133-140. DOI: 10.5220/0004743601330140

in Bibtex Style

@conference{biosignals14,
author={Marc Ebner and Johannes Hansen},
title={Improving Color Constancy in the Presence of Multiple Illuminants using Depth Information},
booktitle={Proceedings of the International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2014)},
year={2014},
pages={133-140},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0004743601330140},
isbn={978-989-758-011-6},
}

in EndNote Style

TY - CONF
JO - Proceedings of the International Conference on Bio-inspired Systems and Signal Processing - Volume 1: BIOSIGNALS, (BIOSTEC 2014)
TI - Improving Color Constancy in the Presence of Multiple Illuminants using Depth Information
SN - 978-989-758-011-6
AU - Ebner M.
AU - Hansen J.
PY - 2014
SP - 133
EP - 140
DO - 10.5220/0004743601330140