MATLAB: How to generate a HS histogram

histogramhs histogramhsvimage processingImage Processing Toolbox

My task is to acquire the frequency values of the H and S values of an image. Therefore, I'm trying to generate a HS histogram of an image. However, I looked up numerous sources and they all create the H and S histograms separately. To state my problem more clearly, how do I know the number of time the H and S values occur together as a pair? Can anyone point me to the right direction?

Thanks!

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See my demo, attached.

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MATLAB: How to collect the each row of a matrix after operation

What are you doing? It makes little sense to me. You're multiplying the histogram counts by the upper left 256x256 portion of the value channel image. Then you're summing the histogram to get b, which is simply the number of pixels in the image. Then you're dividing the "a" by "b". So essentially it looks like you're just computing the mean of the value channel, which can be done more simply as

M = mean2(v);

MATLAB: Extract data from a histogram from a certain range on the x-axis

The easiest way is to store the output of the hist() call, which will be the counts (or the counts and the centers if you have two outputs.) You can then bar() the graph into existence:

[counts, centers] = hist(YourData);
bar(centers, counts, 'hist');

Failing that, if you really need to pull data out of an existing hist(), then:

histpatch = findobj(gca, 'type', 'patch');
edgemat = get(histpatch, 'XData');
countmat = get(histpatch, 'YData');
counts = countmat(2,:);
centers = mean(edgemat(2:3,:));

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MATLAB: How to collect the each row of a matrix after operation

MATLAB: Extract data from a histogram from a certain range on the x-axis

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