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<div class="subTitle">org.opencv.features2d</div>
<h2 title="Class SimpleBlobDetector" class="title">Class SimpleBlobDetector</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>
<li>
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<li><a href="../../../org/opencv/features2d/Feature2D.html" title="class in org.opencv.features2d">org.opencv.features2d.Feature2D</a></li>
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<li>org.opencv.features2d.SimpleBlobDetector</li>
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<pre>public class <span class="typeNameLabel">SimpleBlobDetector</span>
extends <a href="../../../org/opencv/features2d/Feature2D.html" title="class in org.opencv.features2d">Feature2D</a></pre>
<div class="block">Class for extracting blobs from an image. :

 The class implements a simple algorithm for extracting blobs from an image:

 1.  Convert the source image to binary images by applying thresholding with several thresholds from
     minThreshold (inclusive) to maxThreshold (exclusive) with distance thresholdStep between
     neighboring thresholds.
 2.  Extract connected components from every binary image by findContours and calculate their
     centers.
 3.  Group centers from several binary images by their coordinates. Close centers form one group that
     corresponds to one blob, which is controlled by the minDistBetweenBlobs parameter.
 4.  From the groups, estimate final centers of blobs and their radiuses and return as locations and
     sizes of keypoints.

 This class performs several filtrations of returned blobs. You should set filterBy\* to true/false
 to turn on/off corresponding filtration. Available filtrations:

 <ul>
   <li>
    <b>By color</b>. This filter compares the intensity of a binary image at the center of a blob to
 blobColor. If they differ, the blob is filtered out. Use blobColor = 0 to extract dark blobs
 and blobColor = 255 to extract light blobs.
   </li>
   <li>
    <b>By area</b>. Extracted blobs have an area between minArea (inclusive) and maxArea (exclusive).
   </li>
   <li>
    <b>By circularity</b>. Extracted blobs have circularity
 (\(\frac{4*\pi*Area}{perimeter * perimeter}\)) between minCircularity (inclusive) and
 maxCircularity (exclusive).
   </li>
   <li>
    <b>By ratio of the minimum inertia to maximum inertia</b>. Extracted blobs have this ratio
 between minInertiaRatio (inclusive) and maxInertiaRatio (exclusive).
   </li>
   <li>
    <b>By convexity</b>. Extracted blobs have convexity (area / area of blob convex hull) between
 minConvexity (inclusive) and maxConvexity (exclusive).
   </li>
 </ul>

 Default values of parameters are tuned to extract dark circular blobs.</div>
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<td class="colFirst"><code>static <a href="../../../org/opencv/features2d/SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/SimpleBlobDetector.html#Z:Z__fromPtr__-long-">__fromPtr__</a></span>(long&nbsp;addr)</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>static <a href="../../../org/opencv/features2d/SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/SimpleBlobDetector.html#create--">create</a></span>()</code>&nbsp;</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static <a href="../../../org/opencv/features2d/SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/SimpleBlobDetector.html#create-org.opencv.features2d.SimpleBlobDetector_Params-">create</a></span>(<a href="../../../org/opencv/features2d/SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a>&nbsp;parameters)</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>java.util.List&lt;<a href="../../../org/opencv/core/MatOfPoint.html" title="class in org.opencv.core">MatOfPoint</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/SimpleBlobDetector.html#getBlobContours--">getBlobContours</a></span>()</code>&nbsp;</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/SimpleBlobDetector.html#getDefaultName--">getDefaultName</a></span>()</code>
<div class="block">Returns the algorithm string identifier.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../org/opencv/features2d/SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/SimpleBlobDetector.html#getParams--">getParams</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/opencv/features2d/SimpleBlobDetector.html#setParams-org.opencv.features2d.SimpleBlobDetector_Params-">setParams</a></span>(<a href="../../../org/opencv/features2d/SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a>&nbsp;params)</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;org.opencv.features2d.<a href="../../../org/opencv/features2d/Feature2D.html" title="class in org.opencv.features2d">Feature2D</a></h3>
<code><a href="../../../org/opencv/features2d/Feature2D.html#compute-java.util.List-java.util.List-java.util.List-">compute</a>, <a href="../../../org/opencv/features2d/Feature2D.html#compute-org.opencv.core.Mat-org.opencv.core.MatOfKeyPoint-org.opencv.core.Mat-">compute</a>, <a href="../../../org/opencv/features2d/Feature2D.html#defaultNorm--">defaultNorm</a>, <a href="../../../org/opencv/features2d/Feature2D.html#descriptorSize--">descriptorSize</a>, <a href="../../../org/opencv/features2d/Feature2D.html#descriptorType--">descriptorType</a>, <a href="../../../org/opencv/features2d/Feature2D.html#detect-java.util.List-java.util.List-">detect</a>, <a href="../../../org/opencv/features2d/Feature2D.html#detect-java.util.List-java.util.List-java.util.List-">detect</a>, <a href="../../../org/opencv/features2d/Feature2D.html#detect-org.opencv.core.Mat-org.opencv.core.MatOfKeyPoint-">detect</a>, <a href="../../../org/opencv/features2d/Feature2D.html#detect-org.opencv.core.Mat-org.opencv.core.MatOfKeyPoint-org.opencv.core.Mat-">detect</a>, <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>, <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>, <a href="../../../org/opencv/features2d/Feature2D.html#empty--">empty</a>, <a href="../../../org/opencv/features2d/Feature2D.html#read-java.lang.String-">read</a>, <a href="../../../org/opencv/features2d/Feature2D.html#write-java.lang.String-">write</a></code></li>
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<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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<h4>__fromPtr__</h4>
<pre>public static&nbsp;<a href="../../../org/opencv/features2d/SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</a>&nbsp;__fromPtr__(long&nbsp;addr)</pre>
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<h4>create</h4>
<pre>public static&nbsp;<a href="../../../org/opencv/features2d/SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</a>&nbsp;create()</pre>
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<h4>create</h4>
<pre>public static&nbsp;<a href="../../../org/opencv/features2d/SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</a>&nbsp;create(<a href="../../../org/opencv/features2d/SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a>&nbsp;parameters)</pre>
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<h4>getBlobContours</h4>
<pre>public&nbsp;java.util.List&lt;<a href="../../../org/opencv/core/MatOfPoint.html" title="class in org.opencv.core">MatOfPoint</a>&gt;&nbsp;getBlobContours()</pre>
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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/features2d/Feature2D.html#getDefaultName--">getDefaultName</a></code>&nbsp;in class&nbsp;<code><a href="../../../org/opencv/features2d/Feature2D.html" title="class in org.opencv.features2d">Feature2D</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>automatically generated</dd>
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<h4>getParams</h4>
<pre>public&nbsp;<a href="../../../org/opencv/features2d/SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a>&nbsp;getParams()</pre>
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<h4>setParams</h4>
<pre>public&nbsp;void&nbsp;setParams(<a href="../../../org/opencv/features2d/SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a>&nbsp;params)</pre>
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