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<title>Binarizer (ZXing 3.5.4 API)</title>
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<div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">com.google.zxing</a></div>
<h1 title="Class Binarizer" class="title">Class Binarizer</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">com.google.zxing.Binarizer</div>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>Direct Known Subclasses:</dt>
<dd><code><a href="common/GlobalHistogramBinarizer.html" title="class in com.google.zxing.common">GlobalHistogramBinarizer</a></code></dd>
</dl>
<hr>
<div class="type-signature"><span class="modifiers">public abstract class </span><span class="element-name type-name-label">Binarizer</span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div>
<div class="block">This class hierarchy provides a set of methods to convert luminance data to 1 bit data.
It allows the algorithm to vary polymorphically, for example allowing a very expensive
thresholding technique for servers and a fast one for mobile. It also permits the implementation
to vary, e.g. a JNI version for Android and a Java fallback version for other platforms.</div>
<dl class="notes">
<dt>Author:</dt>
<dd>dswitkin@google.com (Daniel Switkin)</dd>
</dl>
</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 three-column-summary">
<div class="table-header col-first">Modifier</div>
<div class="table-header col-second">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color"><code>protected </code></div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(com.google.zxing.LuminanceSource)" class="member-name-link">Binarizer</a><wbr>(<a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a> source)</code></div>
<div class="col-last even-row-color"> </div>
</div>
</section>
</li>
<!-- ========== 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-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-tab3" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab3', 3)" class="table-tab">Abstract 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>
<div id="method-summary-table.tabpanel" role="tabpanel" aria-labelledby="method-summary-table-tab0">
<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-tab2 method-summary-table-tab3"><code>abstract <a href="Binarizer.html" title="class in com.google.zxing">Binarizer</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#createBinarizer(com.google.zxing.LuminanceSource)" class="member-name-link">createBinarizer</a><wbr>(<a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a> source)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Creates a new object with the same type as this Binarizer implementation, but with pristine
state.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>abstract <a href="common/BitMatrix.html" title="class in com.google.zxing.common">BitMatrix</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getBlackMatrix()" class="member-name-link">getBlackMatrix</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Converts a 2D array of luminance data to 1 bit data.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code>abstract <a href="common/BitArray.html" title="class in com.google.zxing.common">BitArray</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3"><code><a href="#getBlackRow(int,com.google.zxing.common.BitArray)" class="member-name-link">getBlackRow</a><wbr>(int y,
<a href="common/BitArray.html" title="class in com.google.zxing.common">BitArray</a> row)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab3">
<div class="block">Converts one row of luminance data to 1 bit data.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>final int</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getHeight()" class="member-name-link">getHeight</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>final <a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getLuminanceSource()" class="member-name-link">getLuminanceSource</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>final int</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getWidth()" class="member-name-link">getWidth</a>()</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#clone--" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/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/javase/8/docs/api/java/lang/Object.html#finalize--" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#getClass--" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notifyAll--" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#toString--" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/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="<init>(com.google.zxing.LuminanceSource)">
<h3>Binarizer</h3>
<div class="member-signature"><span class="modifiers">protected</span> <span class="element-name">Binarizer</span><wbr><span class="parameters">(<a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a> source)</span></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="getLuminanceSource()">
<h3>getLuminanceSource</h3>
<div class="member-signature"><span class="modifiers">public final</span> <span class="return-type"><a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a></span> <span class="element-name">getLuminanceSource</span>()</div>
</section>
</li>
<li>
<section class="detail" id="getBlackRow(int,com.google.zxing.common.BitArray)">
<h3>getBlackRow</h3>
<div class="member-signature"><span class="modifiers">public abstract</span> <span class="return-type"><a href="common/BitArray.html" title="class in com.google.zxing.common">BitArray</a></span> <span class="element-name">getBlackRow</span><wbr><span class="parameters">(int y,
<a href="common/BitArray.html" title="class in com.google.zxing.common">BitArray</a> row)</span>
throws <span class="exceptions"><a href="NotFoundException.html" title="class in com.google.zxing">NotFoundException</a></span></div>
<div class="block">Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
cached data. Callers should assume this method is expensive and call it as seldom as possible.
This method is intended for decoding 1D barcodes and may choose to apply sharpening.
For callers which only examine one row of pixels at a time, the same BitArray should be reused
and passed in with each call for performance. However it is legal to keep more than one row
at a time if needed.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>y</code> - The row to fetch, which must be in [0, bitmap height)</dd>
<dd><code>row</code> - An optional preallocated array. If null or too small, it will be ignored.
If used, the Binarizer will call BitArray.clear(). Always use the returned object.</dd>
<dt>Returns:</dt>
<dd>The array of bits for this row (true means black).</dd>
<dt>Throws:</dt>
<dd><code><a href="NotFoundException.html" title="class in com.google.zxing">NotFoundException</a></code> - if row can't be binarized</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getBlackMatrix()">
<h3>getBlackMatrix</h3>
<div class="member-signature"><span class="modifiers">public abstract</span> <span class="return-type"><a href="common/BitMatrix.html" title="class in com.google.zxing.common">BitMatrix</a></span> <span class="element-name">getBlackMatrix</span>()
throws <span class="exceptions"><a href="NotFoundException.html" title="class in com.google.zxing">NotFoundException</a></span></div>
<div class="block">Converts a 2D array of luminance data to 1 bit data. As above, assume this method is expensive
and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
may not apply sharpening. Therefore, a row from this matrix may not be identical to one
fetched using getBlackRow(), so don't mix and match between them.</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>The 2D array of bits for the image (true means black).</dd>
<dt>Throws:</dt>
<dd><code><a href="NotFoundException.html" title="class in com.google.zxing">NotFoundException</a></code> - if image can't be binarized to make a matrix</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="createBinarizer(com.google.zxing.LuminanceSource)">
<h3>createBinarizer</h3>
<div class="member-signature"><span class="modifiers">public abstract</span> <span class="return-type"><a href="Binarizer.html" title="class in com.google.zxing">Binarizer</a></span> <span class="element-name">createBinarizer</span><wbr><span class="parameters">(<a href="LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a> source)</span></div>
<div class="block">Creates a new object with the same type as this Binarizer implementation, but with pristine
state. This is needed because Binarizer implementations may be stateful, e.g. keeping a cache
of 1 bit data. See Effective Java for why we can't use Java's clone() method.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>source</code> - The LuminanceSource this Binarizer will operate on.</dd>
<dt>Returns:</dt>
<dd>A new concrete Binarizer implementation object.</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getWidth()">
<h3>getWidth</h3>
<div class="member-signature"><span class="modifiers">public final</span> <span class="return-type">int</span> <span class="element-name">getWidth</span>()</div>
</section>
</li>
<li>
<section class="detail" id="getHeight()">
<h3>getHeight</h3>
<div class="member-signature"><span class="modifiers">public final</span> <span class="return-type">int</span> <span class="element-name">getHeight</span>()</div>
</section>
</li>
</ul>
</section>
</li>
</ul>
</section>
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