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<!DOCTYPE html>
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<title>dip::Feature::LineBased class | DIPlib | a library for quantitative image analysis</title>
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<a href="https://diplib.org"><img src="DIPlib_logo.svg" alt="" />DIPlib</a><span class="m-breadcrumb">┃</span><a href="index.html" class="m-thin">a library for quantitative image analysis</a><span class="m-breadcrumb">┃</span><a href="https://github.com/DIPlib/diplib/releases/tag/3.5.1" class="m-thin">version 3.5.1</a> </span>
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<h1>
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<span class="m-thin"><a href="measurement.html" class="m-doc">Measurement</a> module</span><br/><span class="m-code m-inverted"><span class="cp">#include</span> <a class="cpf" href="file--diplib--measurement-h.html">"diplib/measurement.h"</a></span> </div>
<span class="m-breadcrumb"><a href="dip.html">dip</a>::<wbr/></span><span class="m-breadcrumb"><a href="dip-Feature.html">Feature</a>::<wbr/></span>LineBased <span class="m-thin">class</span> </h1>
<p>The pure virtual base class for all line-based measurement features.</p>
<div class="m-block m-default">
<h3>Contents</h3>
<ul>
<li>
Reference
<ul>
<li><a href="#base-classes">Base classes</a></li>
<li><a href="#function-members">Functions</a></li>
</ul>
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<section id="base-classes">
<h2>Base classes</h2>
<dl class="m-doc">
<dt>
class <a href="dip-Feature-Base.html" class="m-doc">dip::<wbr />Feature::<wbr />Base</a> <span class="m-label m-flat m-warning">abstract</span>
</dt>
<dd>The pure virtual base class for all measurement features.</dd>
</dl>
</section>
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<h2>Functions</h2>
<dl class="m-doc">
<dt>
<span class="m-doc-wrap-bumper">void <a href="#dip-Feature-LineBased-ScanLine-LineIterator<LabelType>--LineIterator<dfloat>--UnsignedArray--dip-uint--ObjectIdToIndexMap-CL" class="m-doc">ScanLine</a>(</span><span class="m-doc-wrap"><a href="dip-LineIterator-T.html" class="m-doc">dip::LineIterator</a> label,
<a href="dip-LineIterator-T.html" class="m-doc">dip::LineIterator</a> grey,
<a href="supporttypes.html#dip-UnsignedArray" class="m-doc">dip::UnsignedArray</a> coordinates,
<a href="supporttypes.html#dip-uint" class="m-doc">dip::uint</a> dimension,
<a href="measurement.html#dip-ObjectIdToIndexMap" class="m-doc">dip::ObjectIdToIndexMap</a> const& objectIndices) <span class="m-label m-flat m-warning">pure virtual</span></span>
</dt>
<dd>Called once for each image line, to accumulate information about each object.
This function is not called in parallel, and hence does not need to be thread-safe.</dd>
<dt id="dip-Feature-LineBased-Finish-dip-uint--Measurement-ValueIterator-">
<span class="m-doc-wrap-bumper">void <a href="#dip-Feature-LineBased-Finish-dip-uint--Measurement-ValueIterator-" class="m-doc-self">Finish</a>(</span><span class="m-doc-wrap"><a href="supporttypes.html#dip-uint" class="m-doc">dip::uint</a> objectIndex,
<a href="dip-Measurement.html#dip-Measurement-ValueIterator" class="m-doc">dip::Measurement::ValueIterator</a> output) <span class="m-label m-flat m-warning">pure virtual</span></span>
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<dd>Called once for each object, to finalize the measurement.</dd>
</dl>
</section>
<section>
<h2>Function documentation</h2>
<section class="m-doc-details" id="dip-Feature-LineBased-ScanLine-LineIterator<LabelType>--LineIterator<dfloat>--UnsignedArray--dip-uint--ObjectIdToIndexMap-CL"><div>
<h3>
<span class="m-doc-wrap-bumper">void
</span><span class="m-doc-wrap"><span class="m-doc-wrap-bumper"><a href="#dip-Feature-LineBased-ScanLine-LineIterator<LabelType>--LineIterator<dfloat>--UnsignedArray--dip-uint--ObjectIdToIndexMap-CL" class="m-doc-self">ScanLine</a>(</span><span class="m-doc-wrap"><a href="dip-LineIterator-T.html" class="m-doc">dip::LineIterator</a> label,
<a href="dip-LineIterator-T.html" class="m-doc">dip::LineIterator</a> grey,
<a href="supporttypes.html#dip-UnsignedArray" class="m-doc">dip::UnsignedArray</a> coordinates,
<a href="supporttypes.html#dip-uint" class="m-doc">dip::uint</a> dimension,
<a href="measurement.html#dip-ObjectIdToIndexMap" class="m-doc">dip::ObjectIdToIndexMap</a> const& objectIndices) <span class="m-label m-warning">pure virtual</span></span></span>
</h3>
<p>Called once for each image line, to accumulate information about each object.
This function is not called in parallel, and hence does not need to be thread-safe.</p>
<p>The two line iterators can always be incremented exactly the same number of times.
<code>label</code> is non-zero where there is an object pixel.
Look up the <code>label</code> value in <code>objectIndices</code> to obtain the index for
the object. Object indices are always between 0 and number of objects - 1. The
<a href="dip-Feature-Base.html#dip-Feature-Base-Initialize-Image-CL-Image-CL-dip-uint-"><code>dip::Feature::Base::Initialize</code></a> function should allocate an array with <code>nObjects</code>
elements, where measurements are accumulated. The <a href="dip-Feature-LineBased.html#dip-Feature-LineBased-Finish-dip-uint--Measurement-ValueIterator-"><code>dip::Feature::LineBased::Finish</code></a>
function is called after the whole image has been scanned, and should provide the
final measurement result for one object given its index (not object ID).</p>
<p><code>coordinates</code> contains the coordinates of the first pixel on the line, and is passed by copy,
so it can be modified. <code>dimension</code> indicates along which dimension to run. Increment
<code>coordinates[ dimension ]</code> at the same time as the line iterators if coordinate information
is required by the algorithm.</p>
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