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<h1>
Recursively compute md5 checksum
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<time class="published" datetime="2019-11-21T09:26:00+01:00">
21 novembre 2019
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<p>The md5 checksum for all files in a folder can be recursively computed then stored in a text file called md5sum.txt with the command :*</p>
<div class="highlight"><pre><span></span><span class="nb">cd</span> /you/folder/of/interest
find -type f <span class="se">\(</span> -not -name <span class="s2">&quot;md5sum.txt&quot;</span> <span class="se">\)</span> -exec md5sum <span class="s1">&#39;{}&#39;</span> <span class="se">\;</span> &gt; md5sum.txt
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<h1>
Open an image with PIL
</h1>
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<time class="published" datetime="2019-11-21T10:21:00+01:00">
21 novembre 2019
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<div class='article_content'>
<p>Python has a library called PIL (short for Python Image Library). With openCV, it provides a very useful set of objects to manipulate image data.</p>
<p>In order to read the content of an image, we will create an <code>Image</code> object</p>
<div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">PIL</span> <span class="kn">import</span> <span class="n">Image</span>
</pre></div>
<p>We now need to specify the image filename as an argument of the open function</p>
<div class="highlight"><pre><span></span><span class="n">img</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="s2">&quot;../images/load_image_PIL/myimage.png&quot;</span><span class="p">)</span>
</pre></div>
<p>If you are in the notebook, you can display the image by calling the object you just created </p>
<div class="highlight"><pre><span></span><span class="n">img</span>
</pre></div>
<p><img alt="png" src="../images/load_image_PIL/myimage.png"></p>
<p>If you pass the image object to the constructor of a Numpy array, the values of the image will be stored in that array</p>
<div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>
<span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">(</span><span class="n">img</span><span class="p">)</span>
</pre></div>
<div class="highlight"><pre><span></span><span class="nb">array</span><span class="p">([[[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">...,</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">]],</span>
<span class="p">[[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">...,</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">]],</span>
<span class="p">[[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">...,</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">]],</span>
<span class="p">...,</span>
<span class="p">[[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">...,</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">]],</span>
<span class="p">[[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">...,</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">]],</span>
<span class="p">[[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">...,</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">],</span>
<span class="p">[</span><span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="mi">255</span><span class="p">]]],</span> <span class="n">dtype</span><span class="o">=</span><span class="n">uint8</span><span class="p">)</span>
</pre></div>
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<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 103 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

2
python/point_cloud_distance.html
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@ -202,7 +202,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 103 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

2
python/quandl.html
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@ -237,7 +237,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 103 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

2
python/randint.html
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@ -156,7 +156,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 103 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

2
python/rename_columns_pandas.html
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@ -647,7 +647,7 @@ you also need to specify the axis.</p>
<footer class="footer">
<div class="container">
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<center>This project contains 103 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
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Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

2
python/reverse.html
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@ -173,7 +173,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 103 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

2
python/reverse_column_order.html
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@ -288,7 +288,7 @@
<footer class="footer">
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<p class="text-muted">
<center>This project contains 103 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

2
python/reverse_row_order.html
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@ -359,7 +359,7 @@
<footer class="footer">
<div class="container">
<p class="text-muted">
<center>This project contains 103 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

2
python/select_lines_values_list.html
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@ -316,7 +316,7 @@
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<p class="text-muted">
<center>This project contains 103 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

2
python/sorting.html
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@ -192,7 +192,7 @@
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<center>This project contains 103 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
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2
python/stock_pandas.html
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@ -381,7 +381,7 @@
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<p class="text-muted">
<center>This project contains 103 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<center>This project contains 105 pages and is available on <a href="https://github.com/redoules/redoules.github.io">GitHub</a>.
<br/>
Copyright &copy; Guillaume Redoulès,
<time datetime="2018">2018</time>.

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