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<div class="subTitle">org.opencv.features2d</div>
<h2 title="Class Feature2D" class="title">Class Feature2D</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../../../org/opencv/core/Algorithm.html" title="class in org.opencv.core">org.opencv.core.Algorithm</a></li>
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<ul class="inheritance">
<li>org.opencv.features2d.Feature2D</li>
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<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../org/opencv/features2d/AffineFeature.html" title="class in org.opencv.features2d">AffineFeature</a>, <a href="../../../org/opencv/features2d/AgastFeatureDetector.html" title="class in org.opencv.features2d">AgastFeatureDetector</a>, <a href="../../../org/opencv/features2d/AKAZE.html" title="class in org.opencv.features2d">AKAZE</a>, <a href="../../../org/opencv/features2d/BRISK.html" title="class in org.opencv.features2d">BRISK</a>, <a href="../../../org/opencv/features2d/FastFeatureDetector.html" title="class in org.opencv.features2d">FastFeatureDetector</a>, <a href="../../../org/opencv/features2d/GFTTDetector.html" title="class in org.opencv.features2d">GFTTDetector</a>, <a href="../../../org/opencv/features2d/KAZE.html" title="class in org.opencv.features2d">KAZE</a>, <a href="../../../org/opencv/features2d/MSER.html" title="class in org.opencv.features2d">MSER</a>, <a href="../../../org/opencv/features2d/ORB.html" title="class in org.opencv.features2d">ORB</a>, <a href="../../../org/opencv/features2d/SIFT.html" title="class in org.opencv.features2d">SIFT</a>, <a href="../../../org/opencv/features2d/SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</a></dd>
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<pre>public class <span class="typeNameLabel">Feature2D</span>
extends <a href="../../../org/opencv/core/Algorithm.html" title="class in org.opencv.core">Algorithm</a></pre>
<div class="block">Abstract base class for 2D image feature detectors and descriptor extractors</div>
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<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>static <a href="../../../org/opencv/features2d/Feature2D.html" title="class in org.opencv.features2d">Feature2D</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#Z:Z__fromPtr__-long-">__fromPtr__</a></span>(long&nbsp;addr)</code>&nbsp;</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#compute-java.util.List-java.util.List-java.util.List-">compute</a></span>(java.util.List&lt;<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&gt;&nbsp;images,
       java.util.List&lt;<a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&gt;&nbsp;keypoints,
       java.util.List&lt;<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&gt;&nbsp;descriptors)</code>&nbsp;</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#compute-org.opencv.core.Mat-org.opencv.core.MatOfKeyPoint-org.opencv.core.Mat-">compute</a></span>(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
       <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints,
       <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;descriptors)</code>
<div class="block">Computes the descriptors for a set of keypoints detected in an image (first variant) or image set
     (second variant).</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#defaultNorm--">defaultNorm</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#descriptorSize--">descriptorSize</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#descriptorType--">descriptorType</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#detect-java.util.List-java.util.List-">detect</a></span>(java.util.List&lt;<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&gt;&nbsp;images,
      java.util.List&lt;<a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&gt;&nbsp;keypoints)</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#detect-java.util.List-java.util.List-java.util.List-">detect</a></span>(java.util.List&lt;<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&gt;&nbsp;images,
      java.util.List&lt;<a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&gt;&nbsp;keypoints,
      java.util.List&lt;<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&gt;&nbsp;masks)</code>&nbsp;</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#detect-org.opencv.core.Mat-org.opencv.core.MatOfKeyPoint-">detect</a></span>(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
      <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints)</code>
<div class="block">Detects keypoints in an image (first variant) or image set (second variant).</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#detect-org.opencv.core.Mat-org.opencv.core.MatOfKeyPoint-org.opencv.core.Mat-">detect</a></span>(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
      <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints,
      <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;mask)</code>
<div class="block">Detects keypoints in an image (first variant) or image set (second variant).</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#detectAndCompute-org.opencv.core.Mat-org.opencv.core.Mat-org.opencv.core.MatOfKeyPoint-org.opencv.core.Mat-">detectAndCompute</a></span>(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
                <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;mask,
                <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints,
                <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;descriptors)</code>
<div class="block">Detects keypoints and computes the descriptors</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#detectAndCompute-org.opencv.core.Mat-org.opencv.core.Mat-org.opencv.core.MatOfKeyPoint-org.opencv.core.Mat-boolean-">detectAndCompute</a></span>(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
                <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;mask,
                <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints,
                <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;descriptors,
                boolean&nbsp;useProvidedKeypoints)</code>
<div class="block">Detects keypoints and computes the descriptors</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#empty--">empty</a></span>()</code>
<div class="block">Returns true if the Algorithm is empty (e.g.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#getDefaultName--">getDefaultName</a></span>()</code>
<div class="block">Returns the algorithm string identifier.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#read-java.lang.String-">read</a></span>(java.lang.String&nbsp;fileName)</code>&nbsp;</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/Feature2D.html#write-java.lang.String-">write</a></span>(java.lang.String&nbsp;fileName)</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;org.opencv.core.<a href="../../../org/opencv/core/Algorithm.html" title="class in org.opencv.core">Algorithm</a></h3>
<code><a href="../../../org/opencv/core/Algorithm.html#clear--">clear</a>, <a href="../../../org/opencv/core/Algorithm.html#getNativeObjAddr--">getNativeObjAddr</a>, <a href="../../../org/opencv/core/Algorithm.html#save-java.lang.String-">save</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>__fromPtr__</h4>
<pre>public static&nbsp;<a href="../../../org/opencv/features2d/Feature2D.html" title="class in org.opencv.features2d">Feature2D</a>&nbsp;__fromPtr__(long&nbsp;addr)</pre>
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<h4>compute</h4>
<pre>public&nbsp;void&nbsp;compute(java.util.List&lt;<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&gt;&nbsp;images,
                    java.util.List&lt;<a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&gt;&nbsp;keypoints,
                    java.util.List&lt;<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&gt;&nbsp;descriptors)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>images</code> - Image set.</dd>
<dd><code>keypoints</code> - Input collection of keypoints. Keypoints for which a descriptor cannot be
     computed are removed. Sometimes new keypoints can be added, for example: SIFT duplicates keypoint
     with several dominant orientations (for each orientation).</dd>
<dd><code>descriptors</code> - Computed descriptors. In the second variant of the method descriptors[i] are
     descriptors computed for a keypoints[i]. Row j is the keypoints (or keypoints[i]) is the
     descriptor for keypoint j-th keypoint.</dd>
</dl>
</li>
</ul>
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<h4>compute</h4>
<pre>public&nbsp;void&nbsp;compute(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
                    <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints,
                    <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;descriptors)</pre>
<div class="block">Computes the descriptors for a set of keypoints detected in an image (first variant) or image set
     (second variant).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>image</code> - Image.</dd>
<dd><code>keypoints</code> - Input collection of keypoints. Keypoints for which a descriptor cannot be
     computed are removed. Sometimes new keypoints can be added, for example: SIFT duplicates keypoint
     with several dominant orientations (for each orientation).</dd>
<dd><code>descriptors</code> - Computed descriptors. In the second variant of the method descriptors[i] are
     descriptors computed for a keypoints[i]. Row j is the keypoints (or keypoints[i]) is the
     descriptor for keypoint j-th keypoint.</dd>
</dl>
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<pre>public&nbsp;int&nbsp;defaultNorm()</pre>
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<h4>descriptorSize</h4>
<pre>public&nbsp;int&nbsp;descriptorSize()</pre>
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<pre>public&nbsp;int&nbsp;descriptorType()</pre>
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<h4>detect</h4>
<pre>public&nbsp;void&nbsp;detect(java.util.List&lt;<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&gt;&nbsp;images,
                   java.util.List&lt;<a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&gt;&nbsp;keypoints)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>images</code> - Image set.</dd>
<dd><code>keypoints</code> - The detected keypoints. In the second variant of the method keypoints[i] is a set
     of keypoints detected in images[i] .
     masks[i] is a mask for images[i].</dd>
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<h4>detect</h4>
<pre>public&nbsp;void&nbsp;detect(java.util.List&lt;<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&gt;&nbsp;images,
                   java.util.List&lt;<a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&gt;&nbsp;keypoints,
                   java.util.List&lt;<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&gt;&nbsp;masks)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>images</code> - Image set.</dd>
<dd><code>keypoints</code> - The detected keypoints. In the second variant of the method keypoints[i] is a set
     of keypoints detected in images[i] .</dd>
<dd><code>masks</code> - Masks for each input image specifying where to look for keypoints (optional).
     masks[i] is a mask for images[i].</dd>
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<pre>public&nbsp;void&nbsp;detect(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
                   <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints)</pre>
<div class="block">Detects keypoints in an image (first variant) or image set (second variant).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>image</code> - Image.</dd>
<dd><code>keypoints</code> - The detected keypoints. In the second variant of the method keypoints[i] is a set
     of keypoints detected in images[i] .
     matrix with non-zero values in the region of interest.</dd>
</dl>
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<pre>public&nbsp;void&nbsp;detect(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
                   <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints,
                   <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;mask)</pre>
<div class="block">Detects keypoints in an image (first variant) or image set (second variant).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>image</code> - Image.</dd>
<dd><code>keypoints</code> - The detected keypoints. In the second variant of the method keypoints[i] is a set
     of keypoints detected in images[i] .</dd>
<dd><code>mask</code> - Mask specifying where to look for keypoints (optional). It must be a 8-bit integer
     matrix with non-zero values in the region of interest.</dd>
</dl>
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<pre>public&nbsp;void&nbsp;detectAndCompute(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
                             <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;mask,
                             <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints,
                             <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;descriptors)</pre>
<div class="block">Detects keypoints and computes the descriptors</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>image</code> - automatically generated</dd>
<dd><code>mask</code> - automatically generated</dd>
<dd><code>keypoints</code> - automatically generated</dd>
<dd><code>descriptors</code> - automatically generated</dd>
</dl>
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<pre>public&nbsp;void&nbsp;detectAndCompute(<a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;image,
                             <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;mask,
                             <a href="../../../org/opencv/core/MatOfKeyPoint.html" title="class in org.opencv.core">MatOfKeyPoint</a>&nbsp;keypoints,
                             <a href="../../../org/opencv/core/Mat.html" title="class in org.opencv.core">Mat</a>&nbsp;descriptors,
                             boolean&nbsp;useProvidedKeypoints)</pre>
<div class="block">Detects keypoints and computes the descriptors</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>image</code> - automatically generated</dd>
<dd><code>mask</code> - automatically generated</dd>
<dd><code>keypoints</code> - automatically generated</dd>
<dd><code>descriptors</code> - automatically generated</dd>
<dd><code>useProvidedKeypoints</code> - automatically generated</dd>
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<pre>public&nbsp;boolean&nbsp;empty()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../org/opencv/core/Algorithm.html#empty--">Algorithm</a></code></span></div>
<div class="block">Returns true if the Algorithm is empty (e.g. in the very beginning or after unsuccessful read</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../org/opencv/core/Algorithm.html#empty--">empty</a></code>&nbsp;in class&nbsp;<code><a href="../../../org/opencv/core/Algorithm.html" title="class in org.opencv.core">Algorithm</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>automatically generated</dd>
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<pre>public&nbsp;java.lang.String&nbsp;getDefaultName()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../org/opencv/core/Algorithm.html#getDefaultName--">Algorithm</a></code></span></div>
<div class="block">Returns the algorithm string identifier.
 This string is used as top level xml/yml node tag when the object is saved to a file or string.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../org/opencv/core/Algorithm.html#getDefaultName--">getDefaultName</a></code>&nbsp;in class&nbsp;<code><a href="../../../org/opencv/core/Algorithm.html" title="class in org.opencv.core">Algorithm</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>automatically generated</dd>
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<pre>public&nbsp;void&nbsp;read(java.lang.String&nbsp;fileName)</pre>
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<pre>public&nbsp;void&nbsp;write(java.lang.String&nbsp;fileName)</pre>
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