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<h2 title="Class GlobalHistogramBinarizer" class="title">Class GlobalHistogramBinarizer</h2>
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<li><a href="../../../../com/google/zxing/Binarizer.html" title="class in com.google.zxing">com.google.zxing.Binarizer</a></li>
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<dt>Direct Known Subclasses:</dt>
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<dd><a href="../../../../com/google/zxing/common/HybridBinarizer.html" title="class in com.google.zxing.common">HybridBinarizer</a></dd>
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<br>
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<pre>public class <span class="typeNameLabel">GlobalHistogramBinarizer</span>
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extends <a href="../../../../com/google/zxing/Binarizer.html" title="class in com.google.zxing">Binarizer</a></pre>
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<div class="block">This Binarizer implementation uses the old ZXing global histogram approach. It is suitable
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for low-end mobile devices which don't have enough CPU or memory to use a local thresholding
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algorithm. However, because it picks a global black point, it cannot handle difficult shadows
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and gradients.
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Faster mobile devices and all desktop applications should probably use HybridBinarizer instead.</div>
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<dl>
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<dt><span class="simpleTagLabel">Author:</span></dt>
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<dd>dswitkin@google.com (Daniel Switkin), Sean Owen</dd>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../com/google/zxing/common/GlobalHistogramBinarizer.html#GlobalHistogramBinarizer-com.google.zxing.LuminanceSource-">GlobalHistogramBinarizer</a></span>(<a href="../../../../com/google/zxing/LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a> source)</code> </td>
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<tr id="i0" class="altColor">
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<td class="colFirst"><code><a href="../../../../com/google/zxing/Binarizer.html" title="class in com.google.zxing">Binarizer</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/google/zxing/common/GlobalHistogramBinarizer.html#createBinarizer-com.google.zxing.LuminanceSource-">createBinarizer</a></span>(<a href="../../../../com/google/zxing/LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a> source)</code>
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<div class="block">Creates a new object with the same type as this Binarizer implementation, but with pristine
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state.</div>
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</td>
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</tr>
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<tr id="i1" class="rowColor">
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<td class="colFirst"><code><a href="../../../../com/google/zxing/common/BitMatrix.html" title="class in com.google.zxing.common">BitMatrix</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/google/zxing/common/GlobalHistogramBinarizer.html#getBlackMatrix--">getBlackMatrix</a></span>()</code>
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<div class="block">Converts a 2D array of luminance data to 1 bit data.</div>
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</td>
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</tr>
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<tr id="i2" class="altColor">
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<td class="colFirst"><code><a href="../../../../com/google/zxing/common/BitArray.html" title="class in com.google.zxing.common">BitArray</a></code></td>
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<td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/google/zxing/common/GlobalHistogramBinarizer.html#getBlackRow-int-com.google.zxing.common.BitArray-">getBlackRow</a></span>(int y,
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<a href="../../../../com/google/zxing/common/BitArray.html" title="class in com.google.zxing.common">BitArray</a> row)</code>
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<div class="block">Converts one row of luminance data to 1 bit data.</div>
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</td>
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</tr>
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<h3>Methods inherited from class com.google.zxing.<a href="../../../../com/google/zxing/Binarizer.html" title="class in com.google.zxing">Binarizer</a></h3>
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<code><a href="../../../../com/google/zxing/Binarizer.html#getHeight--">getHeight</a>, <a href="../../../../com/google/zxing/Binarizer.html#getLuminanceSource--">getLuminanceSource</a>, <a href="../../../../com/google/zxing/Binarizer.html#getWidth--">getWidth</a></code></li>
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<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h3>Constructor Detail</h3>
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<a name="GlobalHistogramBinarizer-com.google.zxing.LuminanceSource-">
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<h4>GlobalHistogramBinarizer</h4>
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<pre>public GlobalHistogramBinarizer(<a href="../../../../com/google/zxing/LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a> source)</pre>
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<h3>Method Detail</h3>
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<a name="getBlackRow-int-com.google.zxing.common.BitArray-">
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<h4>getBlackRow</h4>
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<pre>public <a href="../../../../com/google/zxing/common/BitArray.html" title="class in com.google.zxing.common">BitArray</a> getBlackRow(int y,
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<a href="../../../../com/google/zxing/common/BitArray.html" title="class in com.google.zxing.common">BitArray</a> row)
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throws <a href="../../../../com/google/zxing/NotFoundException.html" title="class in com.google.zxing">NotFoundException</a></pre>
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<div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../com/google/zxing/Binarizer.html#getBlackRow-int-com.google.zxing.common.BitArray-">Binarizer</a></code></span></div>
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<div class="block">Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
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cached data. Callers should assume this method is expensive and call it as seldom as possible.
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This method is intended for decoding 1D barcodes and may choose to apply sharpening.
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For callers which only examine one row of pixels at a time, the same BitArray should be reused
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and passed in with each call for performance. However it is legal to keep more than one row
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at a time if needed.</div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code><a href="../../../../com/google/zxing/Binarizer.html#getBlackRow-int-com.google.zxing.common.BitArray-">getBlackRow</a></code> in class <code><a href="../../../../com/google/zxing/Binarizer.html" title="class in com.google.zxing">Binarizer</a></code></dd>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>y</code> - The row to fetch, which must be in [0, bitmap height)</dd>
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<dd><code>row</code> - An optional preallocated array. If null or too small, it will be ignored.
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If used, the Binarizer will call BitArray.clear(). Always use the returned object.</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>The array of bits for this row (true means black).</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="../../../../com/google/zxing/NotFoundException.html" title="class in com.google.zxing">NotFoundException</a></code> - if row can't be binarized</dd>
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</dl>
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</li>
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</ul>
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<a name="getBlackMatrix--">
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</a>
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<ul class="blockList">
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<h4>getBlackMatrix</h4>
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<pre>public <a href="../../../../com/google/zxing/common/BitMatrix.html" title="class in com.google.zxing.common">BitMatrix</a> getBlackMatrix()
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throws <a href="../../../../com/google/zxing/NotFoundException.html" title="class in com.google.zxing">NotFoundException</a></pre>
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<div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../com/google/zxing/Binarizer.html#getBlackMatrix--">Binarizer</a></code></span></div>
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<div class="block">Converts a 2D array of luminance data to 1 bit data. As above, assume this method is expensive
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and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
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may not apply sharpening. Therefore, a row from this matrix may not be identical to one
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fetched using getBlackRow(), so don't mix and match between them.</div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code><a href="../../../../com/google/zxing/Binarizer.html#getBlackMatrix--">getBlackMatrix</a></code> in class <code><a href="../../../../com/google/zxing/Binarizer.html" title="class in com.google.zxing">Binarizer</a></code></dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>The 2D array of bits for the image (true means black).</dd>
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<dt><span class="throwsLabel">Throws:</span></dt>
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<dd><code><a href="../../../../com/google/zxing/NotFoundException.html" title="class in com.google.zxing">NotFoundException</a></code> - if image can't be binarized to make a matrix</dd>
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</dl>
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</li>
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</ul>
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<a name="createBinarizer-com.google.zxing.LuminanceSource-">
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<h4>createBinarizer</h4>
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<pre>public <a href="../../../../com/google/zxing/Binarizer.html" title="class in com.google.zxing">Binarizer</a> createBinarizer(<a href="../../../../com/google/zxing/LuminanceSource.html" title="class in com.google.zxing">LuminanceSource</a> source)</pre>
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<div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../com/google/zxing/Binarizer.html#createBinarizer-com.google.zxing.LuminanceSource-">Binarizer</a></code></span></div>
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<div class="block">Creates a new object with the same type as this Binarizer implementation, but with pristine
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state. This is needed because Binarizer implementations may be stateful, e.g. keeping a cache
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of 1 bit data. See Effective Java for why we can't use Java's clone() method.</div>
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<dl>
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<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
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<dd><code><a href="../../../../com/google/zxing/Binarizer.html#createBinarizer-com.google.zxing.LuminanceSource-">createBinarizer</a></code> in class <code><a href="../../../../com/google/zxing/Binarizer.html" title="class in com.google.zxing">Binarizer</a></code></dd>
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<dt><span class="paramLabel">Parameters:</span></dt>
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<dd><code>source</code> - The LuminanceSource this Binarizer will operate on.</dd>
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<dt><span class="returnLabel">Returns:</span></dt>
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<dd>A new concrete Binarizer implementation object.</dd>
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</dl>
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</li>
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</ul>
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</li>
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</ul>
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