MATLAB: How to combine different histograms

histogramno attemptunclear

I have several different histograms and I want to take as a result a final histogram. I am looking for a way to combine the different histograms and manage to make it one.

Best Answer

As long as the bins cover the same ranges, you can simply add them. If they don't, then you'll have to align the ranges some how, which might mean taking the histograms again with histc and making sure all the bins are in the same places.

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MATLAB: How to remove the black line from the bottom of histogram plotting

Try this:

fontSize = 20;
grayImage=imread('cameraman.tif');
subplot(1,2,1)
imshow(grayImage,[]);
axis on
subplot(1,2,2)
[counts, bins] = histcounts(grayImage, 256);
bar(bins(1:end-1), counts, 'BarWidth', 1);
title('Histogram', 'FontSize', fontSize);
xlabel('Gray Level', 'FontSize', fontSize);
ylabel('PixelCount', 'FontSize', fontSize);
grid on;
xlim([0,256])
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')

MATLAB: Difference between hist and imhist

For a gray scale image imhist() will give 256 bins. hist() only gives 10 by default. But you did not use hist() to take the histogram of the image - the badly-named "I". You used it to take a histogram of the histogram counts, x - a pretty weird/strange thing to do.

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Related Solutions

MATLAB: How to remove the black line from the bottom of histogram plotting

MATLAB: Difference between hist and imhist

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