Experiments in Sensor Sharpening for Color Constancy
Kobus Barnard and Brian Funt, "Experiments in Sensor Sharpening for Color
Constancy," Proceedings of the IS&T/SID Sixth Color Imaging Conference:
Color Science, Systems and Applications, 1998 (to appear).
Abstract:
Sensor sharpening has been proposed as a method for improving color constancy
algorithms but it has not been tested in the context of real color constancy
algorithms. In this paper we test sensor sharpening as a method for improving
color constancy algorithms in the case of three different cameras, the
human cone sensitivity estimates, and the XYZ response curves. We find
that when the sensors are already relatively sharp, sensor sharpening does
not offer much improvement and can have a detrimental effect. However,
when the sensors are less sharp, sharpening can have a substantive positive
effect. The degree of improvement is heavily dependent on the particular
color constancy algorithm. Thus we conclude that using sensor sharpening
for improving color constancy can offer a significant benefit, but its
use needs to be evaluated with respect to both the sensors and the algorithm.
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Keywords: colour, colour constancy, sensor sharpening, diagonal models,
coefficient colour constancy, von Kries transforms
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