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demoJointHistogram.html
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<!DOCTYPE html
PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<!--
This HTML was auto-generated from MATLAB code.
To make changes, update the MATLAB code and republish this document.
--><title>demoJointHistogram</title><meta name="generator" content="MATLAB 9.8"><link rel="schema.DC" href="http://purl.org/dc/elements/1.1/"><meta name="DC.date" content="2020-07-29"><meta name="DC.source" content="demoJointHistogram.m"><style type="text/css">
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</style></head><body><div class="content"><h2>Contents</h2><div><ul><li><a href="#2">Input data</a></li><li><a href="#3">joint histogram</a></li></ul></div><pre class="codeinput"><span class="comment">%DEMOJOINTHISTOGRAM One-line description here, please.</span>
<span class="comment">%</span>
<span class="comment">% output = demoJointHistogram(input)</span>
<span class="comment">%</span>
<span class="comment">% Example</span>
<span class="comment">% demoJointHistogram</span>
<span class="comment">%</span>
<span class="comment">% See also</span>
<span class="comment">%</span>
<span class="comment">% ------</span>
<span class="comment">% Author: David Legland</span>
<span class="comment">% e-mail: david.legland@inrae.fr</span>
<span class="comment">% INRAE - BIA Research Unit - BIBS Platform (Nantes)</span>
<span class="comment">% Created: 2020-07-29, using Matlab 9.8.0.1323502 (R2020a)</span>
<span class="comment">% Copyright 2020 INRAE.</span>
</pre><h2 id="2">Input data</h2><pre class="codeinput"><span class="comment">% read a color image</span>
img = Image.read(<span class="string">'peppers.png'</span>);
<span class="comment">% show it</span>
figure; show(img);
</pre><img vspace="5" hspace="5" src="demoJointHistogram_01.png" alt=""> <h2 id="3">joint histogram</h2><pre class="codeinput"><span class="comment">% compute joint histogram, as an image!</span>
histoRG = jointHistogram(channel(img, 1), channel(img, 2));
<span class="comment">% use logarithmic representation for better display</span>
histoRG2 = log(histoRG+1);
<span class="comment">% display</span>
figure; show(histoRG2);
colormap(jet);
set(gca, <span class="string">'ydir'</span>, <span class="string">'normal'</span>);
</pre><img vspace="5" hspace="5" src="demoJointHistogram_02.png" alt=""> <p class="footer"><br><a href="https://www.mathworks.com/products/matlab/">Published with MATLAB® R2020a</a><br></p></div><!--
##### SOURCE BEGIN #####
%DEMOJOINTHISTOGRAM One-line description here, please.
%
% output = demoJointHistogram(input)
%
% Example
% demoJointHistogram
%
% See also
%
% REPLACE_WITH_DASH_DASHREPLACE_WITH_DASH_DASHREPLACE_WITH_DASH_DASH
% Author: David Legland
% e-mail: david.legland@inrae.fr
% INRAE - BIA Research Unit - BIBS Platform (Nantes)
% Created: 2020-07-29, using Matlab 9.8.0.1323502 (R2020a)
% Copyright 2020 INRAE.
%% Input data
% read a color image
img = Image.read('peppers.png');
% show it
figure; show(img);
%% joint histogram
% compute joint histogram, as an image!
histoRG = jointHistogram(channel(img, 1), channel(img, 2));
% use logarithmic representation for better display
histoRG2 = log(histoRG+1);
% display
figure; show(histoRG2);
colormap(jet);
set(gca, 'ydir', 'normal');
##### SOURCE END #####
--></body></html>