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<title>BOWKMeansTrainer (OpenCV 4.12.0 Java documentation)</title>
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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.opencv.features2d</a></div>
<h1 title="Class BOWKMeansTrainer" class="title">Class BOWKMeansTrainer</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance"><a href="BOWTrainer.html" title="class in org.opencv.features2d">org.opencv.features2d.BOWTrainer</a>
<div class="inheritance">org.opencv.features2d.BOWKMeansTrainer</div>
</div>
</div>
<section class="class-description" id="class-description">
<hr>
<div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">BOWKMeansTrainer</span>
<span class="extends-implements">extends <a href="BOWTrainer.html" title="class in org.opencv.features2d">BOWTrainer</a></span></div>
<div class="block">kmeans -based class to train visual vocabulary using the *bag of visual words* approach. :</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<li>
<section class="constructor-summary" id="constructor-summary">
<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
<div class="summary-table two-column-summary">
<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(int)" class="member-name-link">BOWKMeansTrainer</a><wbr>(int&nbsp;clusterCount)</code></div>
<div class="col-last even-row-color">
<div class="block">The constructor.</div>
</div>
<div class="col-constructor-name odd-row-color"><code><a href="#%3Cinit%3E(int,org.opencv.core.TermCriteria)" class="member-name-link">BOWKMeansTrainer</a><wbr>(int&nbsp;clusterCount,
<a href="../core/TermCriteria.html" title="class in org.opencv.core">TermCriteria</a>&nbsp;termcrit)</code></div>
<div class="col-last odd-row-color">
<div class="block">The constructor.</div>
</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(int,org.opencv.core.TermCriteria,int)" class="member-name-link">BOWKMeansTrainer</a><wbr>(int&nbsp;clusterCount,
<a href="../core/TermCriteria.html" title="class in org.opencv.core">TermCriteria</a>&nbsp;termcrit,
int&nbsp;attempts)</code></div>
<div class="col-last even-row-color">
<div class="block">The constructor.</div>
</div>
<div class="col-constructor-name odd-row-color"><code><a href="#%3Cinit%3E(int,org.opencv.core.TermCriteria,int,int)" class="member-name-link">BOWKMeansTrainer</a><wbr>(int&nbsp;clusterCount,
<a href="../core/TermCriteria.html" title="class in org.opencv.core">TermCriteria</a>&nbsp;termcrit,
int&nbsp;attempts,
int&nbsp;flags)</code></div>
<div class="col-last odd-row-color">
<div class="block">The constructor.</div>
</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
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<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="BOWKMeansTrainer.html" title="class in org.opencv.features2d">BOWKMeansTrainer</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#__fromPtr__(long)" class="member-name-link">__fromPtr__</a><wbr>(long&nbsp;addr)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">&nbsp;</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../core/Mat.html" title="class in org.opencv.core">Mat</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#cluster()" class="member-name-link">cluster</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../core/Mat.html" title="class in org.opencv.core">Mat</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#cluster(org.opencv.core.Mat)" class="member-name-link">cluster</a><wbr>(<a href="../core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;descriptors)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Clusters train descriptors.</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.opencv.features2d.BOWTrainer">Methods inherited from class&nbsp;org.opencv.features2d.<a href="BOWTrainer.html" title="class in org.opencv.features2d">BOWTrainer</a></h3>
<code><a href="BOWTrainer.html#add(org.opencv.core.Mat)">add</a>, <a href="BOWTrainer.html#clear()">clear</a>, <a href="BOWTrainer.html#descriptorsCount()">descriptorsCount</a>, <a href="BOWTrainer.html#getDescriptors()">getDescriptors</a>, <a href="BOWTrainer.html#getNativeObjAddr()">getNativeObjAddr</a></code></div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
<section class="constructor-details" id="constructor-detail">
<h2>Constructor Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="&lt;init&gt;(int,org.opencv.core.TermCriteria,int,int)">
<h3>BOWKMeansTrainer</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">BOWKMeansTrainer</span><wbr><span class="parameters">(int&nbsp;clusterCount,
<a href="../core/TermCriteria.html" title="class in org.opencv.core">TermCriteria</a>&nbsp;termcrit,
int&nbsp;attempts,
int&nbsp;flags)</span></div>
<div class="block">The constructor.
SEE: cv::kmeans</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>clusterCount</code> - automatically generated</dd>
<dd><code>termcrit</code> - automatically generated</dd>
<dd><code>attempts</code> - automatically generated</dd>
<dd><code>flags</code> - automatically generated</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="&lt;init&gt;(int,org.opencv.core.TermCriteria,int)">
<h3>BOWKMeansTrainer</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">BOWKMeansTrainer</span><wbr><span class="parameters">(int&nbsp;clusterCount,
<a href="../core/TermCriteria.html" title="class in org.opencv.core">TermCriteria</a>&nbsp;termcrit,
int&nbsp;attempts)</span></div>
<div class="block">The constructor.
SEE: cv::kmeans</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>clusterCount</code> - automatically generated</dd>
<dd><code>termcrit</code> - automatically generated</dd>
<dd><code>attempts</code> - automatically generated</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="&lt;init&gt;(int,org.opencv.core.TermCriteria)">
<h3>BOWKMeansTrainer</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">BOWKMeansTrainer</span><wbr><span class="parameters">(int&nbsp;clusterCount,
<a href="../core/TermCriteria.html" title="class in org.opencv.core">TermCriteria</a>&nbsp;termcrit)</span></div>
<div class="block">The constructor.
SEE: cv::kmeans</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>clusterCount</code> - automatically generated</dd>
<dd><code>termcrit</code> - automatically generated</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="&lt;init&gt;(int)">
<h3>BOWKMeansTrainer</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">BOWKMeansTrainer</span><wbr><span class="parameters">(int&nbsp;clusterCount)</span></div>
<div class="block">The constructor.
SEE: cv::kmeans</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>clusterCount</code> - automatically generated</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="__fromPtr__(long)">
<h3>__fromPtr__</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="BOWKMeansTrainer.html" title="class in org.opencv.features2d">BOWKMeansTrainer</a></span>&nbsp;<span class="element-name">__fromPtr__</span><wbr><span class="parameters">(long&nbsp;addr)</span></div>
</section>
</li>
<li>
<section class="detail" id="cluster()">
<h3>cluster</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="../core/Mat.html" title="class in org.opencv.core">Mat</a></span>&nbsp;<span class="element-name">cluster</span>()</div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="BOWTrainer.html#cluster()">cluster</a></code>&nbsp;in class&nbsp;<code><a href="BOWTrainer.html" title="class in org.opencv.features2d">BOWTrainer</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="cluster(org.opencv.core.Mat)">
<h3>cluster</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="../core/Mat.html" title="class in org.opencv.core">Mat</a></span>&nbsp;<span class="element-name">cluster</span><wbr><span class="parameters">(<a href="../core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;descriptors)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from class:&nbsp;<code><a href="BOWTrainer.html#cluster(org.opencv.core.Mat)">BOWTrainer</a></code></span></div>
<div class="block">Clusters train descriptors.</div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="BOWTrainer.html#cluster(org.opencv.core.Mat)">cluster</a></code>&nbsp;in class&nbsp;<code><a href="BOWTrainer.html" title="class in org.opencv.features2d">BOWTrainer</a></code></dd>
<dt>Parameters:</dt>
<dd><code>descriptors</code> - Descriptors to cluster. Each row of the descriptors matrix is a descriptor.
Descriptors are not added to the inner train descriptor set.
The vocabulary consists of cluster centers. So, this method returns the vocabulary. In the first
variant of the method, train descriptors stored in the object are clustered. In the second variant,
input descriptors are clustered.</dd>
<dt>Returns:</dt>
<dd>automatically generated</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
</ul>
</section>
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<p class="legal-copy"><small>Generated on 2025-07-02 13:16:04 / OpenCV 4.12.0</small></p>
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