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<title>SimpleBlobDetector (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 SimpleBlobDetector" class="title">Class SimpleBlobDetector</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="Feature2D.html" title="class in org.opencv.features2d">org.opencv.features2d.Feature2D</a>
<div class="inheritance">org.opencv.features2d.SimpleBlobDetector</div>
</div>
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</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">SimpleBlobDetector</span>
<span class="extends-implements">extends <a href="Feature2D.html" title="class in org.opencv.features2d">Feature2D</a></span></div>
<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>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ========== METHOD SUMMARY =========== -->
<li>
<section class="method-summary" id="method-summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
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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="SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</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="SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</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">&nbsp;</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static <a href="SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</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(org.opencv.features2d.SimpleBlobDetector_Params)" class="member-name-link">create</a><wbr>(<a href="SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a>&nbsp;parameters)</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="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../core/MatOfPoint.html" title="class in org.opencv.core">MatOfPoint</a>&gt;</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getBlobContours()" class="member-name-link">getBlobContours</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="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getDefaultName()" class="member-name-link">getDefaultName</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Returns the algorithm string identifier.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getParams()" class="member-name-link">getParams</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>void</code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#setParams(org.opencv.features2d.SimpleBlobDetector_Params)" class="member-name-link">setParams</a><wbr>(<a href="SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a>&nbsp;params)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-org.opencv.features2d.Feature2D">Methods inherited from class&nbsp;org.opencv.features2d.<a href="Feature2D.html" title="class in org.opencv.features2d">Feature2D</a></h3>
<code><a href="Feature2D.html#compute(java.util.List,java.util.List,java.util.List)">compute</a>, <a href="Feature2D.html#compute(org.opencv.core.Mat,org.opencv.core.MatOfKeyPoint,org.opencv.core.Mat)">compute</a>, <a href="Feature2D.html#defaultNorm()">defaultNorm</a>, <a href="Feature2D.html#descriptorSize()">descriptorSize</a>, <a href="Feature2D.html#descriptorType()">descriptorType</a>, <a href="Feature2D.html#detect(java.util.List,java.util.List)">detect</a>, <a href="Feature2D.html#detect(java.util.List,java.util.List,java.util.List)">detect</a>, <a href="Feature2D.html#detect(org.opencv.core.Mat,org.opencv.core.MatOfKeyPoint)">detect</a>, <a href="Feature2D.html#detect(org.opencv.core.Mat,org.opencv.core.MatOfKeyPoint,org.opencv.core.Mat)">detect</a>, <a href="Feature2D.html#detectAndCompute(org.opencv.core.Mat,org.opencv.core.Mat,org.opencv.core.MatOfKeyPoint,org.opencv.core.Mat)">detectAndCompute</a>, <a href="Feature2D.html#detectAndCompute(org.opencv.core.Mat,org.opencv.core.Mat,org.opencv.core.MatOfKeyPoint,org.opencv.core.Mat,boolean)">detectAndCompute</a>, <a href="Feature2D.html#empty()">empty</a>, <a href="Feature2D.html#read(java.lang.String)">read</a>, <a href="Feature2D.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#clear()">clear</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">
<!-- ============ 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="SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</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(org.opencv.features2d.SimpleBlobDetector_Params)">
<h3>create</h3>
<div class="member-signature"><span class="modifiers">public static</span>&nbsp;<span class="return-type"><a href="SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</a></span>&nbsp;<span class="element-name">create</span><wbr><span class="parameters">(<a href="SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a>&nbsp;parameters)</span></div>
</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="SimpleBlobDetector.html" title="class in org.opencv.features2d">SimpleBlobDetector</a></span>&nbsp;<span class="element-name">create</span>()</div>
</section>
</li>
<li>
<section class="detail" id="setParams(org.opencv.features2d.SimpleBlobDetector_Params)">
<h3>setParams</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">void</span>&nbsp;<span class="element-name">setParams</span><wbr><span class="parameters">(<a href="SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a>&nbsp;params)</span></div>
</section>
</li>
<li>
<section class="detail" id="getParams()">
<h3>getParams</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="SimpleBlobDetector_Params.html" title="class in org.opencv.features2d">SimpleBlobDetector_Params</a></span>&nbsp;<span class="element-name">getParams</span>()</div>
</section>
</li>
<li>
<section class="detail" id="getDefaultName()">
<h3>getDefaultName</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name">getDefaultName</span>()</div>
<div class="block"><span class="descfrm-type-label">Description copied from class:&nbsp;<code><a href="../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 class="notes">
<dt>Overrides:</dt>
<dd><code><a href="Feature2D.html#getDefaultName()">getDefaultName</a></code>&nbsp;in class&nbsp;<code><a href="Feature2D.html" title="class in org.opencv.features2d">Feature2D</a></code></dd>
<dt>Returns:</dt>
<dd>automatically generated</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getBlobContours()">
<h3>getBlobContours</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a>&lt;<a href="../core/MatOfPoint.html" title="class in org.opencv.core">MatOfPoint</a>&gt;</span>&nbsp;<span class="element-name">getBlobContours</span>()</div>
</section>
</li>
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</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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