Compare two histograms with Correlation Coefficient

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Sandra Marta 2016-11-16

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评论： Sandra Marta 2016-11-16

Im am trying to get a histogram of the hue of an image and then compare two different image histograms with correlation coefficient. "Corr2" is not working..

img = imread('hb1.jpeg'); hsvImage = rgb2hsv(img); hImage = hsvImage(:, :, 1); figure; subplot(2,2,1); hHist = histogram(hImage);

img = imread('hb2.jpeg'); hsvImage = rgb2hsv(img); hImage = hsvImage(:, :, 1); figure; subplot(2,2,1); hHist2 = histogram(hImage);

R=corr2(hHist, hHist2);

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Answer 1

Steven Lord 2016-11-16

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The corrcoef function cannot accept histogram object handles. You may have better luck using corrcoef on the vectors of bin counts from two calls to histcounts (using the same set of edges for each call) instead.

% Sample data
x1 = randn(1, 1e5);
x2 = 2*randn(1, 1e5);
% Obtain the vectors of bin counts. Use the set of edges returned from the first call
% as an input to the second call so the vector of bin counts are the same length and
% measure "apples to apples"
[n2, edges] = histcounts(x2);
n1 = histcounts(x1, edges);
% Compute the correlation coefficient between the vectors of bin counts
corrcoef(n1, n2)