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Lower Entropy Basis Functions for Continuous Tone Color Images

IP.com Disclosure Number: IPCOM000121251D
Original Publication Date: 1991-Aug-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 23K

Publishing Venue

IBM

Related People

Feig, E: AUTHOR [+2]

Abstract

Conversion from RGB to other "color bases" such as YUV is an important process in the processing of continuous tone color image data [*]. For example, it provides a simple redundancy removal procedure for lossy compression of such data. Disclosed is the following change of basis: Y = 0.299 R + 0.587 G + 0.144 B X = Y - G V = Y - R The idea behind replacing the U component with the X component is that the latter has less entropy. It will be readily appreciated that the number of entries greater than the various thresholds in the X components are in general considerably smaller than the number of entries greater than the same thresholds in the corresponding U components.

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Lower Entropy Basis Functions for Continuous Tone Color Images

      Conversion from RGB to other "color bases" such as YUV is
an important process in the processing of continuous tone color image
data [*]. For example, it provides a simple redundancy removal
procedure for lossy compression of such data. Disclosed is the
following change of basis:
                     Y = 0.299 R + 0.587 G + 0.144 B
                     X = Y - G
                     V = Y - R
The idea behind replacing the U component with the X component is
that the latter has less entropy.  It will be readily appreciated
that the number of entries greater than the various thresholds in the
X components are in general considerably smaller than the number of
entries greater than the same thresholds in the corresponding U
components.

      Reference
(*)  J. D. McFall, J. L. Mitchell and W. B. Pennebaker, "Displaying
Photographic Images on Computer Monitors with Limited Color
Resolution," Digital Image Processing Applications, No. 1075, SPIE,
Los Angeles, CA, pp. 179-184 (January 1989).