Color Constant Color Indexing
B.V. Funt and G.D. Finlayson. "Color Constant Color Indexing." IEEE
Transaction on Pattern Analysis and Machine Intelligence, Vol. 17, No.
5, 1995. pp. 522-529.
Objects can be recognized on the basis of their color
alone by color indexing, a technique developed by Swain and Ballard
 which involves matching color-space histograms. Color indexing
fails, however, when the incident illumination varies either spatially
or spectrally. Although this limitation might be overcome by
preprocessing with a color constancy algorithm, we instead propose
histogramming color ratios. Since the ratios of color RGB triples from
neighboring locations are relatively insensitive to changes in the
incident illumination, this circumvents the need for color constancy
preprocessing. Results of tests with the new
color-constant-color-indexing algorithm on synthetic and real images
show that it works very well even when the illumination varies
spatially in its intensity and color.
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Keywords: Color indexing, color constancy, retinex, object
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