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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=62" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">一文了解“光学传递函数”与“调制传递函数” </h1> <p class="xg1"> 时间：2021-10-18 09:27<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1913)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=9309&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a>来自: 网络平台</p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=62" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>今天我们来一起了解一下“光学传递函数”与“调制传递函数”，同时也看看相关的一些产品。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><p> 今天我们来一起了解一下“光学传递函数”与“调制传递函数”，同时也看看相关的一些<a href="http://b.oecr.com/sell" target="_blank" class="relatedlink">产品</a>。</p><p> 光学传递函数（OTF）把空间频率当作变量，用来表达像的传递函数和相位的传递函数。</p><p> OTF可以用来描述光学系统像质，它是认为图像是由不同频率的频谱构成，换句话说，即物体光强的分布函数能够按照傅里叶级数的形式展开。</p><p> 光学传递函数也可以用一个复合函数来表示，由幅值MTF(f)和相位PTF（f）两部分组成，如下式所示：</p><p style="text-align: center;"><a href="data/attachment/portal/202110/18/093119k1yhtkcck1dkys8a.png" target="_blank"><img src="data/attachment/portal/202110/18/093119k1yhtkcck1dkys8a.png"></a></p><p> 其中MTF（f）是实部，调制传递函数，它表示像的调制度和物的调制度之比，PTF（f）是虚部，相位传递函数，它表示光学传递函数的相位变化。在成像系统中，往往使用调制传递函数描述像质的优劣，使用MTF 的限制是成像系统需要是满足线性以及空间不变性。</p><p> 光学传递函数（OTF）可以按照幅值和相位分别用振幅传递函数(MTF)和相位传递函数(PTF)来表示。</p><p> MTF,表示在各个频率分量上目标背景经过成像系统后对比度的变化情况。PTF,描述经过成像系统后，目标背景在各个频率上相位的移动情况。</p><p> 因为我们通常研究的都是线性时不变系统，而PTF 表征的是相对于起始位置的位移变化情况，当成像系统的入射光线是非相干的，就可以认为MTF 等同与OTF。</p><p> MTF全称Modulation Transfer Function，中文为调制传递函数。MTF是一个<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>光学概念，用来对光学系统性能进行评价的重要指标。</p><p> MTF 是光学传递函数OTF模值，用来描述成像系统在空间频率范围上的响应和分辨率，所以，MTF 截止频率一般由成像系统的真实分辨率来决定。</p><p> 使用调制传递函数（MTF）方法来对成像系统进行研究分析，需要系统是线性时不变的，并且在非相干光入射的情况下，系统的映射响应是单值函数。对这些条件的成像系统就是空间时不变系统。</p><p> 除了入射光是非相干光外，严格来讲绝大多数的成像系统是不能够都复合的，所以通常会把成像系统近似看成是线性时不变的。</p><p> （来源：本文中的技术<a href="http://theory.oecr.com" target="_blank" class="relatedlink">理论</a>是通过收集网络上的一些平台<a href="http://theory.oecr.com" target="_blank" class="relatedlink">资料</a>后进行整理和编排制作的。由于水平和能力有限，仅供大家参考。如有什么理论常识错误或者其他不当之处，请在文末留言或者联系我们。欢迎大家纠错和提出意见，我们将及时进行修改或者删除。）</p><p> MTF<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>仪器</p><p> 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