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When I wish to compare 2D image histograms I can use methods like Chi-Square and Intersection but what are my options if I wish to compare 3D histograms (e.g, based on R,G,B values)?

Thanks.

wrek
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  • Please explain what a "3D histogram" is. If you have a three-band ("RGB") image it will yield three ordinary histograms, one for each band. That doesn't even sound 2D, much less 3D! – whuber Aug 07 '14 at 20:46
  • this is a scatter version of what I mean http://rsb.info.nih.gov/ij/plugins/color-inspector.html – wrek Aug 07 '14 at 20:53
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    Thank you: that really is 3D! It is a histogram in which the vectors $(r,g,b)$ have been binned and counted. Since chi-squared statistics apply just as well to such objects as the usual histograms, and you seem to be seeking alternatives, I would guess you have some particular kinds of comparisons in mind. What are they? What are you trying to find out when you compare two such image histograms? – whuber Aug 07 '14 at 20:56
  • Both methods you mention for 2D should apply to 3D. Are you seeking further methods than those? – Glen_b Aug 08 '14 at 03:06
  • Yes, I am seeking further methods. – wrek Aug 08 '14 at 08:17

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