Details of Grant 

EPSRC Reference:	GR/R65978/01
Title:	Chromagenic Colour Constancy
Principal Investigator:	Finlayson, Professor G
Other Investigators:	Hordley, Dr S
Researcher Co-Investigators:
Project Partners:	Hewlett Packard
Department:	Computing Sciences
Organisation:	University of East Anglia
Scheme:	Standard Research (Pre-FEC)
Starts:	01 June 2002	Ends:	31 May 2005	Value (£):	242,584
EPSRC Research Topic Classifications:	Image & Vision Computing
EPSRC Industrial Sector Classifications:	Creative Industries
Related Grants:
Panel History:
Summary on Grant Application Form
After many years of research the single illuminant/many surface colour constancy problem remains open. Although good progress has been made towards a solution, it is still not possible to decouple the colour of the single illuminant from multiple surfaces. The chromagenic camera is a new idea for colour camera design that has the potential to render this problem easy to solve. In addition, it offers the possibility of making the pointwise decoupling of light and surface practical. A chromagenic camera captures two RGB images; the first is the same as in a conventional camera but the second is optically prefiltered. This prefiltering can be thought of as changing the effective illumination pointwise across the scene, so that at each image location we effectively have RGB measurements of a surface viewed under two unknown lights. It is well known that the colour constancy problem with two lights is easier to solve than the one illuminant case; though experiments have shown that it is not much easier. The key advantage that the chromagenic camera has is that it knows how the two illuminants are related to one another - they differ by the optical prefiltering - and this knowledge can be exploited in solving the pointwise colour constancy problem.A chromagenic colour constancy algorithm will help to solve important multiple illuminant problems in digital photography including finding the optimal colour balance for a scene, image enhancement in general and dynamic range compression in particular.
Key Findings
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Organisation Website:	http://www.uea.ac.uk