How can I find the percentage of the overlap of two histograms in Matlab?

Question

Zahra 2013-11-5

回答： Image Analyst 2014-11-21

I try to plot two histograms and I need to know quantitavely what is the area and percentage of overlap of these two histograms.

Image Analyst 2013-11-5

Do the bins cover the same ranges? Like they're both 5 units wide and have edges in the same locations?

Filippo 2014-11-21

Assuming they do cover the same ranges... can anyone answer this question? I'm looking too!

Answer 1

Image Analyst 2014-11-21

I'd put each histogram into one row and take the min and the max.

bothHistograms = [hist1; hist2];
minCounts = min(bothHistograms, [], 1);
maxCounts = max(bothHistograms, [], 1);

Then get the ratio of the min value for each bin to the max value for each bin:

ratios = minCounts ./ maxCounts;

If you want the average percentage coverage over all bins, take the mean over all bins:

meanPercentage = mean(ratios);