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comparison of two histograms using pdist2

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Muhammad Ali Qadar
Muhammad Ali Qadar 2013-8-23
评论： Devarshi Patel 2018-12-10
hi, I am having two Images I wanted compare these two Images by histograms I have read about pdist that provides 'chisq' but i think the way i am doing is not correct, and what to do to show the result afterwards because this is giving a black image.
i1=imread('blue_4.gif');i1=i1(:,:,1);
[c1,n]=imhist(i1);
c1=c1/size(i1,1)/size(i1,2);
i2=imread('blue_5.jpeg');i2=i2(:,:,1);
[c2,n2]=imhist(i2);
c2=c2/size(i2,1)/size(i2,2);
d=pdist2(c1,c2,'chisq');
please give me a working example thanks

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Anand
Anand 2013-8-23
You almost got it right. Just transpose the histograms. So you're last command should be
d = pdist2(c1',c2');
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Sashank
Sashank 2017-11-19
I am beginner. Please guide me about How can I know how much similar two images are ?

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Raghunandan
Raghunandan 2014-10-31
编辑：Raghunandan 2014-10-31
Just wanted to let you know that pdist2 in MATLAB uses 'Euclidean' distance by default. If you are looking to get 'ChiSquare' distance, please use the code found here.
http://www.cs.columbia.edu/~mmerler/project/code/pdist2.m
  1 个评论
ndoum ekanga steve willy
ndoum ekanga steve willy 2015-11-27
编辑：ndoum ekanga steve willy 2015-11-27
But this doesnt give me any output, i cant even see the similarity.
% read two images Im1 = imread('ckt_1.tif'); Im2 = imread('ckt_3.tif');
% convert images to type double (range from from 0 to 1 instead of from 0 to 255) Im1 = im2double(Im1); Im2 = im2double(Im2);
% Calculate the Normalized Histogram of Image 1 and Image 2 hn1 = imhist(Im1)./numel(Im1); hn2 = imhist(Im2)./numel(Im2);
% Calculate the histogram error
f = sum((hn1 - hn2).^2); f; %display the result to console

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