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<title>python图像处理工具pillow opencv等练习1 旋转</title>
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<a href="/img_rotate.html" rel="bookmark"
title="Permalink to python图像处理工具pillow opencv等练习1 旋转">python图像处理工具pillow opencv等练习1 旋转</a></h1>
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<abbr class="published" title="2018-12-26T08:20:00+08:00">
Published: 三 26 十二月 2018
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<address class="vcard author">
By <a class="url fn" href="/author/andrew.html">andrew</a>
</address>
<p>In <a href="/category/python.html">python</a>.</p>
</footer><!-- /.post-info --> <ul>
<li><a href="https://china-testing.github.io/practices.html">python测试开发项目实战-目录</a></li>
<li><a href="https://china-testing.github.io/python_books.html">python工具书籍下载-持续更新</a></li>
<li><a href="https://china-testing.github.io/python3_quick.html">python 3.7极速入门教程 - 目录</a></li>
</ul>
<h3 id="_1">对如下图片旋转</h3>
<p><img alt="image.png" src="https://upload-images.jianshu.io/upload_images/12713060-3b0e1960983e5502.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"></p>
<p>将上面图片逆时针旋转45度，90度，要求图片内容完整。</p>
<h3 id="pillow">pillow</h3>
<div class="highlight"><pre><span></span><span class="ch">#!/usr/bin/env python3</span>
<span class="c1"># -*- coding: utf-8 -*-</span>
<span class="c1"># https://china-testing.github.io/pil1.html</span>
<span class="c1"># https://github.com/china-testing/python-api-tesing/blob/master/practices/pillow/rotate.py</span>
<span class="c1"># 项目实战讨论QQ群630011153 144081101</span>
<span class="c1"># CreateDate: 2018-12-26</span>
<span class="kn">from</span> <span class="nn">PIL</span> <span class="kn">import</span> <span class="n">Image</span>
<span class="n">im</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">"qun.jpg"</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="n">im</span><span class="o">.</span><span class="n">size</span><span class="p">)</span>
<span class="n">im</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
<span class="n">im2</span> <span class="o">=</span> <span class="n">im</span><span class="o">.</span><span class="n">rotate</span><span class="p">(</span><span class="mi">45</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="n">im2</span><span class="o">.</span><span class="n">size</span><span class="p">)</span>
<span class="n">im2</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
<span class="n">im2</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="s2">"test1.jpg"</span><span class="p">)</span>
<span class="n">im3</span> <span class="o">=</span> <span class="n">im</span><span class="o">.</span><span class="n">rotate</span><span class="p">(</span><span class="mi">45</span><span class="p">,</span> <span class="n">expand</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
<span class="k">print</span><span class="p">(</span><span class="n">im3</span><span class="o">.</span><span class="n">size</span><span class="p">)</span>
<span class="n">im3</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
<span class="n">im3</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="s2">"test2.jpg"</span><span class="p">)</span>
</pre></div>
<p>执行结果：</p>
<div class="highlight"><pre><span></span><span class="p">(</span><span class="mi">489</span><span class="p">,</span> <span class="mi">594</span><span class="p">)</span>
<span class="p">(</span><span class="mi">489</span><span class="p">,</span> <span class="mi">594</span><span class="p">)</span>
<span class="p">(</span><span class="mi">767</span><span class="p">,</span> <span class="mi">766</span><span class="p">)</span>
</pre></div>
<p><img alt="test1.jpg" src="https://upload-images.jianshu.io/upload_images/12713060-21643432eef1f1ab.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"></p>
<p><img alt="test2.jpg" src="https://upload-images.jianshu.io/upload_images/12713060-f404abebcd88aad6.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"></p>
<p>注意点：pillow在没有设置expand=True的情况，旋转可能会丢失部分内容。设置expand=True的情况下，则可能增大图片像素。</p>
<p>90度的旋转和45的类似。具体参考代码 https://github.com/china-testing/python-api-tesing/blob/master/practices/pillow/rotate.py。</p>
<p>90度旋转在没有设置expand=True的情况下，图片也是有丢失的。</p>
<p><img alt="test3.jpg" src="https://upload-images.jianshu.io/upload_images/12713060-dc2bde95859af7dc.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"></p>
<p>另外：transpose(Image.ROTATE_90)和im.rotate(90, expand=True)的效果实际是相同。</p>
<p>参考资料：</p>
<p>https://www.toutiao.com/i6637827317458567687/</p>
<p>https://china-testing.github.io/python3_lib_pil.html</p>
<h3 id="pillow_1">旋转图片更多pillow练习</h3>
<p>把/home/andrew/code/tmp_photos2的jpg图片旋转270度，放在/home/andrew/code/tmp_photos3 </p>
<p>参考资料：<a href="https://github.com/china-testing/python-api-tesing#%E5%9B%BE%E5%83%8F%E5%A4%84%E7%90%86image-processing">python图像处理库</a></p>
<p>要求实现的命令行界面如下：</p>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
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17</pre></div></td><td class="code"><div class="highlight"><pre><span></span>$ python3 rotate.py -h
usage: rotate.py <span class="o">[</span>-h<span class="o">]</span> <span class="o">[</span>-t TYPE<span class="o">]</span> <span class="o">[</span>-a ANGLE<span class="o">]</span> <span class="o">[</span>--version<span class="o">]</span> src dst
功能：旋转图片
示例： $ python3 rotate.py /home/andrew/code/tmp_photos2 /home/andrew/code/tmp_photos3 -a <span class="m">270</span>
把/home/andrew/code/tmp_photos2的jpg图片旋转270度，放在/home/andrew/code/tmp_photos3
positional arguments:
src 源目录
dst 目的目录
optional arguments:
-h, --help show this <span class="nb">help</span> message and <span class="nb">exit</span>
-t TYPE 文件扩展名, 默认为jpg
-a ANGLE 旋转角度，默认为90度，方向都为逆时针。
--version show program<span class="err">'</span>s version number and <span class="nb">exit</span>
</pre></div>
</td></tr></table>
<p>旋转前：</p>
<p><img alt="photo.jpg" src="https://upload-images.jianshu.io/upload_images/10819934-f2f74d08c0cd62dc.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"></p>
<p>旋转后</p>
<p><img alt="photo.jpg" src="https://upload-images.jianshu.io/upload_images/10819934-6e06decc073c0180.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240"></p>
<p>需求来源： 用户拍的图片人脸未必是头在上，下巴在下面，但是人脸识别的时扶正的识别效果比较好，为此...</p>
<p>参考代码：</p>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
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31</pre></div></td><td class="code"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">glob</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">argparse</span>
<span class="kn">from</span> <span class="nn">PIL</span> <span class="kn">import</span> <span class="n">Image</span>
<span class="kn">import</span> <span class="nn">photos</span>
<span class="kn">import</span> <span class="nn">data_common</span>
<span class="n">description</span> <span class="o">=</span> <span class="s1">'''</span>
<span class="s1">功能：旋转图片</span>
<span class="s1">示例： $ python3 rotate.py /home/andrew/code/tmp_photos2 /home/andrew/code/tmp_photos3 -a 270</span>
<span class="s1">'''</span>
<span class="n">parser</span> <span class="o">=</span> <span class="n">argparse</span><span class="o">.</span><span class="n">ArgumentParser</span><span class="p">(</span><span class="n">description</span><span class="o">=</span><span class="n">description</span><span class="p">,</span>
<span class="n">formatter_class</span><span class="o">=</span><span class="n">argparse</span><span class="o">.</span><span class="n">RawTextHelpFormatter</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s1">'src'</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s2">"store"</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="sa">u</span><span class="s1">'源目录'</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s1">'dst'</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s2">"store"</span><span class="p">,</span> <span class="n">help</span><span class="o">=</span><span class="sa">u</span><span class="s1">'目的目录'</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s1">'-t'</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s2">"store"</span><span class="p">,</span> <span class="n">dest</span><span class="o">=</span><span class="s2">"type"</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="s2">"jpg"</span><span class="p">,</span>
<span class="n">help</span><span class="o">=</span><span class="sa">u</span><span class="s1">'文件扩展名, 默认为jpg'</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s1">'-a'</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s2">"store"</span><span class="p">,</span> <span class="n">dest</span><span class="o">=</span><span class="s2">"angle"</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="mi">90</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">int</span><span class="p">,</span>
<span class="n">help</span><span class="o">=</span><span class="sa">u</span><span class="s1">'旋转角度，默认为90度，方向都为逆时针。'</span><span class="p">)</span>
<span class="n">parser</span><span class="o">.</span><span class="n">add_argument</span><span class="p">(</span><span class="s1">'--version'</span><span class="p">,</span> <span class="n">action</span><span class="o">=</span><span class="s1">'version'</span><span class="p">,</span>
<span class="n">version</span><span class="o">=</span><span class="s1">'</span><span class="si">%(prog)s</span><span class="s1"> 1.0 Rongzhong xu 2018 04 26'</span><span class="p">)</span>
<span class="n">options</span> <span class="o">=</span> <span class="n">parser</span><span class="o">.</span><span class="n">parse_args</span><span class="p">()</span>
<span class="n">data_common</span><span class="o">.</span><span class="n">check_directory</span><span class="p">(</span><span class="n">options</span><span class="o">.</span><span class="n">dst</span><span class="p">)</span>
<span class="n">files</span> <span class="o">=</span> <span class="n">data_common</span><span class="o">.</span><span class="n">find_files_by_type</span><span class="p">(</span><span class="n">options</span><span class="o">.</span><span class="n">src</span><span class="p">,</span> <span class="n">filetype</span><span class="o">=</span><span class="n">options</span><span class="o">.</span><span class="n">type</span><span class="p">)</span>
<span class="n">photos</span><span class="o">.</span><span class="n">rotate</span><span class="p">(</span><span class="n">files</span><span class="p">,</span> <span class="n">options</span><span class="o">.</span><span class="n">dst</span><span class="p">,</span> <span class="n">options</span><span class="o">.</span><span class="n">angle</span><span class="p">)</span>
</pre></div>
</td></tr></table>
<p><a href="https://github.com/china-testing/python-api-tesing/">上述代码依赖的部分库</a></p>
<h3 id="_2">参考资料</h3>
<ul>
<li>讨论qq群630011153 144081101</li>
<li><a href="https://github.com/china-testing/python-api-tesing">本文涉及的python测试开发库</a> 谢谢点赞！</li>
<li><a href="https://github.com/china-testing/python-api-tesing/blob/master/books.md">本文相关海量书籍下载</a></li>
<li><a href="https://china-testing.github.io/img_rotate.html">本文最新版本</a></li>
</ul>
<h3 id="opencv">opencv</h3>
<p>opencv的旋转比pillow复杂，不过好在有imutils辅助，具体代码参见：</p>
<p>https://github.com/china-testing/python-api-tesing/blob/master/practices/cv/rotate.py</p>
<p>本文如遇格式问题，请访问： https://china-testing.github.io/img_rotate.html</p>
<p>wand库旋转的参考： http://docs.wand-py.org/en/0.4.1/guide/transform.html</p>
<h3 id="_3">参考资料</h3>
<ul>
<li>讨论 qq群144081101 567351477</li>
<li><a href="https://china-testing.github.io/ai_books.html">本文最新版本地址</a></li>
<li><a href="https://github.com/china-testing/python-api-tesing">本文涉及的python测试开发库</a> 谢谢点赞！</li>
<li><a href="https://github.com/china-testing/python-api-tesing/blob/master/books.md">本文相关海量书籍下载</a> </li>
<li>道家技术-手相手诊看相中医等钉钉群21734177 qq群：391441566 184175668 338228106 看手相、面相、舌相、抽签、体质识别。服务费50元每人次起。请联系钉钉或者微信pythontesting</li>
<li><a href="https://china-testing.github.io/testing_training.html">接口自动化性能测试线上培训大纲</a></li>
<li><a href="https://www.fullstackpython.com/monitoring.html">Monitoring</a></li>
</ul>
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