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add demo for jointHistogram
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‎demos/demoJointHistogram.m‎

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%DEMOJOINTHISTOGRAM One-line description here, please.
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%
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% output = demoJointHistogram(input)
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%
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% Example
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% demoJointHistogram
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%
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% See also
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%
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% ------
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% Author: David Legland
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% e-mail: david.legland@inrae.fr
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% INRAE - BIA Research Unit - BIBS Platform (Nantes)
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% Created: 2020-07-29, using Matlab 9.8.0.1323502 (R2020a)
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% Copyright 2020 INRAE.
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%% Input data
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% read a color image
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img = Image.read('peppers.png');
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% show it
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figure; show(img);
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%% joint histogram
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% compute joint histogram, as an image!
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histoRG = jointHistogram(channel(img, 1), channel(img, 2));
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% use logarithmic representation for better display
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histoRG2 = log(histoRG+1);
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% display
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figure; show(histoRG2);
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colormap(jet);
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set(gca, 'ydir', 'normal');

‎demos/html/demoJointHistogram.html‎

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<!DOCTYPE html
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PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html><head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<!--
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This HTML was auto-generated from MATLAB code.
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To make changes, update the MATLAB code and republish this document.
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--><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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html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,font,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,center,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td{margin:0;padding:0;border:0;outline:0;font-size:100%;vertical-align:baseline;background:transparent}body{line-height:1}ol,ul{list-style:none}blockquote,q{quotes:none}blockquote:before,blockquote:after,q:before,q:after{content:'';content:none}:focus{outine:0}ins{text-decoration:none}del{text-decoration:line-through}table{border-collapse:collapse;border-spacing:0}
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html { min-height:100%; margin-bottom:1px; }
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html body { height:100%; margin:0px; font-family:Arial, Helvetica, sans-serif; font-size:10px; color:#000; line-height:140%; background:#fff none; overflow-y:scroll; }
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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>
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<span class="comment">%</span>
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<span class="comment">% output = demoJointHistogram(input)</span>
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<span class="comment">%</span>
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<span class="comment">% Example</span>
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<span class="comment">% demoJointHistogram</span>
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<span class="comment">%</span>
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<span class="comment">% See also</span>
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<span class="comment">%</span>
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<span class="comment">% ------</span>
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<span class="comment">% Author: David Legland</span>
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<span class="comment">% e-mail: david.legland@inrae.fr</span>
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<span class="comment">% INRAE - BIA Research Unit - BIBS Platform (Nantes)</span>
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<span class="comment">% Created: 2020-07-29, using Matlab 9.8.0.1323502 (R2020a)</span>
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<span class="comment">% Copyright 2020 INRAE.</span>
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</pre><h2 id="2">Input data</h2><pre class="codeinput"><span class="comment">% read a color image</span>
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img = Image.read(<span class="string">'peppers.png'</span>);
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<span class="comment">% show it</span>
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figure; show(img);
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</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>
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histoRG = jointHistogram(channel(img, 1), channel(img, 2));
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<span class="comment">% use logarithmic representation for better display</span>
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histoRG2 = log(histoRG+1);
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<span class="comment">% display</span>
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figure; show(histoRG2);
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colormap(jet);
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set(gca, <span class="string">'ydir'</span>, <span class="string">'normal'</span>);
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</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&reg; R2020a</a><br></p></div><!--
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##### SOURCE BEGIN #####
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%DEMOJOINTHISTOGRAM One-line description here, please.
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%
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% output = demoJointHistogram(input)
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%
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% Example
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% demoJointHistogram
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%
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% See also
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%
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% REPLACE_WITH_DASH_DASHREPLACE_WITH_DASH_DASHREPLACE_WITH_DASH_DASH
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% Author: David Legland
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% e-mail: david.legland@inrae.fr
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% INRAE - BIA Research Unit - BIBS Platform (Nantes)
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% Created: 2020-07-29, using Matlab 9.8.0.1323502 (R2020a)
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% Copyright 2020 INRAE.
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%% Input data
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% read a color image
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img = Image.read('peppers.png');
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% show it
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figure; show(img);
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%% joint histogram
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% compute joint histogram, as an image!
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histoRG = jointHistogram(channel(img, 1), channel(img, 2));
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% use logarithmic representation for better display
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histoRG2 = log(histoRG+1);
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% display
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figure; show(histoRG2);
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colormap(jet);
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set(gca, 'ydir', 'normal');
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##### SOURCE END #####
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--></body></html>

‎demos/html/demoJointHistogram.png‎

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‎demos/html/demoJointHistogram_01.png‎

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‎demos/html/demoJointHistogram_02.png‎

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