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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<h1>binreducelow.c File Reference</h1> </div>
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<p>Low-level implementation of power of 2 reduction.
<a href="#_details">More...</a></p>
<div class="textblock"><code>#include <stdio.h></code><br/>
<code>#include <string.h></code><br/>
<code>#include <stdlib.h></code><br/>
<code>#include "<a class="el" href="allheaders_8h_source.html">allheaders.h</a>"</code><br/>
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<p><a href="binreducelow_8c_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="binreducelow_8c.html#ae7d544d70a9d03e71770214cfdffaa14">reduceBinary2Low</a> (<a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> *datad, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> wpld, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> *datas, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> hs, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> wpls, <a class="el" href="environ_8h.html#a7ed60554e7d6dd89aca643189b1e70ad">l_uint8</a> *tab)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="binreducelow_8c.html#a9d04146214c711b33fe6617f2ce6c736">reduceRankBinary2Low</a> (<a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> *datad, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> wpld, <a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> *datas, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> hs, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> wpls, <a class="el" href="environ_8h.html#a7ed60554e7d6dd89aca643189b1e70ad">l_uint8</a> *tab, <a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> level)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="environ_8h.html#a7ed60554e7d6dd89aca643189b1e70ad">l_uint8</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="binreducelow_8c.html#a70343d973da93c3e09ee529c0ef4cc15">makeSubsampleTab2x</a> (void)</td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Low-level implementation of power of 2 reduction. </p>
<div class="fragment"><pre class="fragment"> Low-level subsampled reduction
<span class="keywordtype">void</span> <a class="code" href="binreducelow_8c.html#ae7d544d70a9d03e71770214cfdffaa14">reduceBinary2Low</a>()
Low-level threshold reduction
<span class="keywordtype">void</span> <a class="code" href="binreducelow_8c.html#a9d04146214c711b33fe6617f2ce6c736">reduceRankBinary2Low</a>()
<a class="code" href="environ_8h.html#a7ed60554e7d6dd89aca643189b1e70ad">l_uint8</a> *<a class="code" href="binreducelow_8c.html#a70343d973da93c3e09ee529c0ef4cc15">makeSubsampleTab2x</a>()
</pre></div>
<p>Definition in file <a class="el" href="binreducelow_8c_source.html">binreducelow.c</a>.</p>
</div><hr/><h2>Function Documentation</h2>
<a class="anchor" id="ae7d544d70a9d03e71770214cfdffaa14"></a><!-- doxytag: member="binreducelow.c::reduceBinary2Low" ref="ae7d544d70a9d03e71770214cfdffaa14" args="(l_uint32 *datad, l_int32 wpld, l_uint32 *datas, l_int32 hs, l_int32 wpls, l_uint8 *tab)" -->
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<td class="memname">void reduceBinary2Low </td>
<td>(</td>
<td class="paramtype"><a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> * </td>
<td class="paramname"><em>datad</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>wpld</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> * </td>
<td class="paramname"><em>datas</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>hs</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>wpls</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a7ed60554e7d6dd89aca643189b1e70ad">l_uint8</a> * </td>
<td class="paramname"><em>tab</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p><a class="el" href="binreducelow_8c.html#ae7d544d70a9d03e71770214cfdffaa14">reduceBinary2Low()</a></p>
<p>After folding, the data is in bytes 0 and 2 of the word, and the bits in each byte are in the following order (with 0 being the leftmost originating pair and 7 being the rightmost originating pair):</p>
<p>0 4 1 5 2 6 3 7</p>
<p>These need to be permuted to</p>
<p>0 1 2 3 4 5 6 7</p>
<p>which is done with an 8-bit table generated by <a class="el" href="binreducelow_8c.html#a70343d973da93c3e09ee529c0ef4cc15">makeSubsampleTab2x()</a>. </p>
<p>Definition at line <a class="el" href="binreducelow_8c_source.html#l00060">60</a> of file <a class="el" href="binreducelow_8c_source.html">binreducelow.c</a>.</p>
<p>References <a class="el" href="environ_8h_source.html#l00151">L_MIN</a>, and <a class="el" href="arrayaccess_8h_source.html#l00146">SET_DATA_TWO_BYTES</a>.</p>
<p>Referenced by <a class="el" href="binreduce_8c_source.html#l00047">pixReduceBinary2()</a>.</p>
</div>
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<a class="anchor" id="a9d04146214c711b33fe6617f2ce6c736"></a><!-- doxytag: member="binreducelow.c::reduceRankBinary2Low" ref="a9d04146214c711b33fe6617f2ce6c736" args="(l_uint32 *datad, l_int32 wpld, l_uint32 *datas, l_int32 hs, l_int32 wpls, l_uint8 *tab, l_int32 level)" -->
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<td class="memname">void reduceRankBinary2Low </td>
<td>(</td>
<td class="paramtype"><a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> * </td>
<td class="paramname"><em>datad</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>wpld</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a4d4d7254020fc95aef5dde8884405358">l_uint32</a> * </td>
<td class="paramname"><em>datas</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>hs</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>wpls</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a7ed60554e7d6dd89aca643189b1e70ad">l_uint8</a> * </td>
<td class="paramname"><em>tab</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="environ_8h.html#a9085c7874153c280a4171244aa052e4e">l_int32</a> </td>
<td class="paramname"><em>level</em> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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<div class="memdoc">
<p><a class="el" href="binreducelow_8c.html#a9d04146214c711b33fe6617f2ce6c736">reduceRankBinary2Low()</a></p>
<p>Rank filtering is done to the UL corner of each 2x2 pixel block, using only logical operations.</p>
<p>Then these pixels are chosen in the 2x subsampling process, subsampled, as described above in <a class="el" href="binreducelow_8c.html#ae7d544d70a9d03e71770214cfdffaa14">reduceBinary2Low()</a>. </p>
<p>Definition at line <a class="el" href="binreducelow_8c_source.html#l00107">107</a> of file <a class="el" href="binreducelow_8c_source.html">binreducelow.c</a>.</p>
<p>References <a class="el" href="environ_8h_source.html#l00151">L_MIN</a>, and <a class="el" href="arrayaccess_8h_source.html#l00146">SET_DATA_TWO_BYTES</a>.</p>
<p>Referenced by <a class="el" href="binreduce_8c_source.html#l00177">pixReduceRankBinary2()</a>.</p>
</div>
</div>
<a class="anchor" id="a70343d973da93c3e09ee529c0ef4cc15"></a><!-- doxytag: member="binreducelow.c::makeSubsampleTab2x" ref="a70343d973da93c3e09ee529c0ef4cc15" args="(void)" -->
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<td class="memname"><a class="el" href="environ_8h.html#a7ed60554e7d6dd89aca643189b1e70ad">l_uint8</a>* makeSubsampleTab2x </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"></td><td>)</td>
<td></td>
</tr>
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<div class="memdoc">
<p><a class="el" href="binreducelow_8c.html#a70343d973da93c3e09ee529c0ef4cc15">makeSubsampleTab2x()</a></p>
<p>This table permutes the bits in a byte, from 0 4 1 5 2 6 3 7 to 0 1 2 3 4 5 6 7 </p>
<p>Definition at line <a class="el" href="binreducelow_8c_source.html#l00237">237</a> of file <a class="el" href="binreducelow_8c_source.html">binreducelow.c</a>.</p>
<p>References <a class="el" href="environ_8h_source.html#l00214">CALLOC</a>, <a class="el" href="environ_8h_source.html#l00250">ERROR_PTR</a>, <a class="el" href="environ_8h_source.html#l00171">NULL</a>, and <a class="el" href="environ_8h_source.html#l00249">PROCNAME</a>.</p>
<p>Referenced by <a class="el" href="binreduce_8c_source.html#l00047">pixReduceBinary2()</a>, <a class="el" href="binreduce_8c_source.html#l00177">pixReduceRankBinary2()</a>, and <a class="el" href="binreduce_8c_source.html#l00108">pixReduceRankBinaryCascade()</a>.</p>
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