Representation and quantization of digital images and evaluation of color differences
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United States of America Patent
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Sep 18, 2012
Grant Date -
Apr 16, 2009
app pub date -
Oct 28, 2008
filing date -
Oct 11, 2007
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Abstract
Digital image data are coded in a color coordinate system bef where b=0.3·ln B and B, e, and f are Bef coordinates. This coding has high perceptual uniformity with respect to coding errors. A color difference formula is provided, with the color difference defined as 100√{square root over (Δb2+Δe2+Δf2)}. The high perceptual uniformity of this color difference formula is shown using a non-uniformity coefficient developed by the inventor(s). Other features are also provided.
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