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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 BFMatcher" class="title">Class BFMatcher</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="../core/Algorithm.html" title="class in org.opencv.core">org.opencv.core.Algorithm</a>
<div class="inheritance"><a href="DescriptorMatcher.html" title="class in org.opencv.features2d">org.opencv.features2d.DescriptorMatcher</a>
<div class="inheritance">org.opencv.features2d.BFMatcher</div>
</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">BFMatcher</span>
<span class="extends-implements">extends <a href="DescriptorMatcher.html" title="class in org.opencv.features2d">DescriptorMatcher</a></span></div>
<div class="block">Brute-force descriptor matcher.
For each descriptor in the first set, this matcher finds the closest descriptor in the second set
by trying each one. This descriptor matcher supports masking permissible matches of descriptor
sets.</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- =========== FIELD SUMMARY =========== -->
<li>
<section class="field-summary" id="field-summary">
<h2>Field Summary</h2>
<div class="inherited-list">
<h3 id="fields-inherited-from-class-org.opencv.features2d.DescriptorMatcher">Fields inherited from class&nbsp;org.opencv.features2d.<a href="DescriptorMatcher.html" title="class in org.opencv.features2d">DescriptorMatcher</a></h3>
<code><a href="DescriptorMatcher.html#BRUTEFORCE">BRUTEFORCE</a>, <a href="DescriptorMatcher.html#BRUTEFORCE_HAMMING">BRUTEFORCE_HAMMING</a>, <a href="DescriptorMatcher.html#BRUTEFORCE_HAMMINGLUT">BRUTEFORCE_HAMMINGLUT</a>, <a href="DescriptorMatcher.html#BRUTEFORCE_L1">BRUTEFORCE_L1</a>, <a href="DescriptorMatcher.html#BRUTEFORCE_SL2">BRUTEFORCE_SL2</a>, <a href="DescriptorMatcher.html#FLANNBASED">FLANNBASED</a></code></div>
</section>
</li>
<!-- ======== 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()" class="member-name-link">BFMatcher</a>()</code></div>
<div class="col-last even-row-color">
<div class="block">Brute-force matcher constructor (obsolete).</div>
</div>
<div class="col-constructor-name odd-row-color"><code><a href="#%3Cinit%3E(int)" class="member-name-link">BFMatcher</a><wbr>(int&nbsp;normType)</code></div>
<div class="col-last odd-row-color">
<div class="block">Brute-force matcher constructor (obsolete).</div>
</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(int,boolean)" class="member-name-link">BFMatcher</a><wbr>(int&nbsp;normType,
boolean&nbsp;crossCheck)</code></div>
<div class="col-last even-row-color">
<div class="block">Brute-force matcher constructor (obsolete).</div>
</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
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<h2>Method Summary</h2>
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<div class="summary-table three-column-summary">
<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="BFMatcher.html" title="class in org.opencv.features2d">BFMatcher</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-tab1 method-summary-table-tab4"><code>static <a href="BFMatcher.html" title="class in org.opencv.features2d">BFMatcher</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#create()" class="member-name-link">create</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Brute-force matcher create method.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="BFMatcher.html" title="class in org.opencv.features2d">BFMatcher</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#create(int)" class="member-name-link">create</a><wbr>(int&nbsp;normType)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Brute-force matcher create method.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="BFMatcher.html" title="class in org.opencv.features2d">BFMatcher</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#create(int,boolean)" class="member-name-link">create</a><wbr>(int&nbsp;normType,
boolean&nbsp;crossCheck)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">
<div class="block">Brute-force matcher create method.</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.opencv.features2d.DescriptorMatcher">Methods inherited from class&nbsp;org.opencv.features2d.<a href="DescriptorMatcher.html" title="class in org.opencv.features2d">DescriptorMatcher</a></h3>
<code><a href="DescriptorMatcher.html#add(java.util.List)">add</a>, <a href="DescriptorMatcher.html#clear()">clear</a>, <a href="DescriptorMatcher.html#clone()">clone</a>, <a href="DescriptorMatcher.html#clone(boolean)">clone</a>, <a href="DescriptorMatcher.html#create(java.lang.String)">create</a>, <a href="DescriptorMatcher.html#empty()">empty</a>, <a href="DescriptorMatcher.html#getTrainDescriptors()">getTrainDescriptors</a>, <a href="DescriptorMatcher.html#isMaskSupported()">isMaskSupported</a>, <a href="DescriptorMatcher.html#knnMatch(org.opencv.core.Mat,java.util.List,int)">knnMatch</a>, <a href="DescriptorMatcher.html#knnMatch(org.opencv.core.Mat,java.util.List,int,java.util.List)">knnMatch</a>, <a href="DescriptorMatcher.html#knnMatch(org.opencv.core.Mat,java.util.List,int,java.util.List,boolean)">knnMatch</a>, <a href="DescriptorMatcher.html#knnMatch(org.opencv.core.Mat,org.opencv.core.Mat,java.util.List,int)">knnMatch</a>, <a href="DescriptorMatcher.html#knnMatch(org.opencv.core.Mat,org.opencv.core.Mat,java.util.List,int,org.opencv.core.Mat)">knnMatch</a>, <a href="DescriptorMatcher.html#knnMatch(org.opencv.core.Mat,org.opencv.core.Mat,java.util.List,int,org.opencv.core.Mat,boolean)">knnMatch</a>, <a href="DescriptorMatcher.html#match(org.opencv.core.Mat,org.opencv.core.MatOfDMatch)">match</a>, <a href="DescriptorMatcher.html#match(org.opencv.core.Mat,org.opencv.core.MatOfDMatch,java.util.List)">match</a>, <a href="DescriptorMatcher.html#match(org.opencv.core.Mat,org.opencv.core.Mat,org.opencv.core.MatOfDMatch)">match</a>, <a href="DescriptorMatcher.html#match(org.opencv.core.Mat,org.opencv.core.Mat,org.opencv.core.MatOfDMatch,org.opencv.core.Mat)">match</a>, <a href="DescriptorMatcher.html#radiusMatch(org.opencv.core.Mat,java.util.List,float)">radiusMatch</a>, <a href="DescriptorMatcher.html#radiusMatch(org.opencv.core.Mat,java.util.List,float,java.util.List)">radiusMatch</a>, <a href="DescriptorMatcher.html#radiusMatch(org.opencv.core.Mat,java.util.List,float,java.util.List,boolean)">radiusMatch</a>, <a href="DescriptorMatcher.html#radiusMatch(org.opencv.core.Mat,org.opencv.core.Mat,java.util.List,float)">radiusMatch</a>, <a href="DescriptorMatcher.html#radiusMatch(org.opencv.core.Mat,org.opencv.core.Mat,java.util.List,float,org.opencv.core.Mat)">radiusMatch</a>, <a href="DescriptorMatcher.html#radiusMatch(org.opencv.core.Mat,org.opencv.core.Mat,java.util.List,float,org.opencv.core.Mat,boolean)">radiusMatch</a>, <a href="DescriptorMatcher.html#read(java.lang.String)">read</a>, <a href="DescriptorMatcher.html#train()">train</a>, <a href="DescriptorMatcher.html#write(java.lang.String)">write</a></code></div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.opencv.core.Algorithm">Methods inherited from class&nbsp;org.opencv.core.<a href="../core/Algorithm.html" title="class in org.opencv.core">Algorithm</a></h3>
<code><a href="../core/Algorithm.html#getDefaultName()">getDefaultName</a>, <a href="../core/Algorithm.html#getNativeObjAddr()">getNativeObjAddr</a>, <a href="../core/Algorithm.html#save(java.lang.String)">save</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,boolean)">
<h3>BFMatcher</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">BFMatcher</span><wbr><span class="parameters">(int&nbsp;normType,
boolean&nbsp;crossCheck)</span></div>
<div class="block">Brute-force matcher constructor (obsolete). Please use BFMatcher.create()</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>normType</code> - automatically generated</dd>
<dd><code>crossCheck</code> - automatically generated</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="&lt;init&gt;(int)">
<h3>BFMatcher</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">BFMatcher</span><wbr><span class="parameters">(int&nbsp;normType)</span></div>
<div class="block">Brute-force matcher constructor (obsolete). Please use BFMatcher.create()</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>normType</code> - automatically generated</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="&lt;init&gt;()">
<h3>BFMatcher</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">BFMatcher</span>()</div>
<div class="block">Brute-force matcher constructor (obsolete). Please use BFMatcher.create()</div>
</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="BFMatcher.html" title="class in org.opencv.features2d">BFMatcher</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="create(int,boolean)">
<h3>create</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="BFMatcher.html" title="class in org.opencv.features2d">BFMatcher</a></span>&nbsp;<span class="element-name">create</span><wbr><span class="parameters">(int&nbsp;normType,
boolean&nbsp;crossCheck)</span></div>
<div class="block">Brute-force matcher create method.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>normType</code> - One of NORM_L1, NORM_L2, NORM_HAMMING, NORM_HAMMING2. L1 and L2 norms are
preferable choices for SIFT and SURF descriptors, NORM_HAMMING should be used with ORB, BRISK and
BRIEF, NORM_HAMMING2 should be used with ORB when WTA_K==3 or 4 (see ORB::ORB constructor
description).</dd>
<dd><code>crossCheck</code> - If it is false, this is will be default BFMatcher behaviour when it finds the k
nearest neighbors for each query descriptor. If crossCheck==true, then the knnMatch() method with
k=1 will only return pairs (i,j) such that for i-th query descriptor the j-th descriptor in the
matcher's collection is the nearest and vice versa, i.e. the BFMatcher will only return consistent
pairs. Such technique usually produces best results with minimal number of outliers when there are
enough matches. This is alternative to the ratio test, used by D. Lowe in SIFT paper.</dd>
<dt>Returns:</dt>
<dd>automatically generated</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="create(int)">
<h3>create</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="BFMatcher.html" title="class in org.opencv.features2d">BFMatcher</a></span>&nbsp;<span class="element-name">create</span><wbr><span class="parameters">(int&nbsp;normType)</span></div>
<div class="block">Brute-force matcher create method.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>normType</code> - One of NORM_L1, NORM_L2, NORM_HAMMING, NORM_HAMMING2. L1 and L2 norms are
preferable choices for SIFT and SURF descriptors, NORM_HAMMING should be used with ORB, BRISK and
BRIEF, NORM_HAMMING2 should be used with ORB when WTA_K==3 or 4 (see ORB::ORB constructor
description).
nearest neighbors for each query descriptor. If crossCheck==true, then the knnMatch() method with
k=1 will only return pairs (i,j) such that for i-th query descriptor the j-th descriptor in the
matcher's collection is the nearest and vice versa, i.e. the BFMatcher will only return consistent
pairs. Such technique usually produces best results with minimal number of outliers when there are
enough matches. This is alternative to the ratio test, used by D. Lowe in SIFT paper.</dd>
<dt>Returns:</dt>
<dd>automatically generated</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="create()">
<h3>create</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="BFMatcher.html" title="class in org.opencv.features2d">BFMatcher</a></span>&nbsp;<span class="element-name">create</span>()</div>
<div class="block">Brute-force matcher create method.
preferable choices for SIFT and SURF descriptors, NORM_HAMMING should be used with ORB, BRISK and
BRIEF, NORM_HAMMING2 should be used with ORB when WTA_K==3 or 4 (see ORB::ORB constructor
description).
nearest neighbors for each query descriptor. If crossCheck==true, then the knnMatch() method with
k=1 will only return pairs (i,j) such that for i-th query descriptor the j-th descriptor in the
matcher's collection is the nearest and vice versa, i.e. the BFMatcher will only return consistent
pairs. Such technique usually produces best results with minimal number of outliers when there are
enough matches. This is alternative to the ratio test, used by D. Lowe in SIFT paper.</div>
<dl class="notes">
<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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