how to compare histograms

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sakshi Garg 2015-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/210263-how-to-compare-histograms

回答： Youssef Khmou 2015-4-19

i want to compare two histograms of lbp images.

i tried using pdist2 but it is showing erroneous results.

please help

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Image Analyst 2015-4-18

So you have two vectors of 256 elements each, which are most likely going to be different for each index. So, what does "compare" mean to you? And do you know that two images can have the same histogram and look totally different?

sakshi Garg 2015-4-19

basically, i want to implement face recognition by histogram matching. so i need a code to compare 1 histogram with many others and find the best match. this match might be in terms of the minimum distance between the two histograms.

if anyone could provide a code for the same, it would be of great help.

thanks in advance

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Answer 1

Youssef Khmou 2015-4-19

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Many approaches exist for this purpose, the easiest way is the root mean square error metric, the minimum value means best match from all samples, f1 and f2 are two normalized histograms that we want to compare :

rmse= sqrt(mean((f1-f2).^2));