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<!DOCTYPE html>
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<title>arrayfire.features — ArrayFire Python documentation</title>
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<h1>Source code for arrayfire.features</h1><div class="highlight"><pre>
<span></span><span class="c1">#######################################################</span>
<span class="c1"># Copyright (c) 2015, ArrayFire</span>
<span class="c1"># All rights reserved.</span>
<span class="c1">#</span>
<span class="c1"># This file is distributed under 3-clause BSD license.</span>
<span class="c1"># The complete license agreement can be obtained at:</span>
<span class="c1"># http://arrayfire.com/licenses/BSD-3-Clause</span>
<span class="c1">########################################################</span>
<span class="sd">"""</span>
<span class="sd">Features class used for Computer Vision algorithms.</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">.library</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">.array</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">import</span> <span class="nn">numbers</span>
<div class="viewcode-block" id="Features"><a class="viewcode-back" href="../../arrayfire.features.html#arrayfire.features.Features">[docs]</a><span class="k">class</span> <span class="nc">Features</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A container class used for various feature detectors.</span>
<span class="sd"> Parameters</span>
<span class="sd"> ----------</span>
<span class="sd"> num: optional: int. default: 0.</span>
<span class="sd"> Specifies the number of features.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">num</span><span class="o">=</span><span class="mi">0</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">feat</span> <span class="o">=</span> <span class="n">c_void_ptr_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="k">if</span> <span class="n">num</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">assert</span><span class="p">(</span><span class="nb">isinstance</span><span class="p">(</span><span class="n">num</span><span class="p">,</span> <span class="n">numbers</span><span class="o">.</span><span class="n">Number</span><span class="p">))</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_create_features</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">feat</span><span class="p">),</span> <span class="n">c_dim_t</span><span class="p">(</span><span class="n">num</span><span class="p">)))</span>
<span class="k">def</span> <span class="fm">__del__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Release features' memory</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">feat</span><span class="p">:</span>
<span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_release_features</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">feat</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">feat</span> <span class="o">=</span> <span class="kc">None</span>
<div class="viewcode-block" id="Features.num_features"><a class="viewcode-back" href="../../arrayfire.features.html#arrayfire.features.Features.num_features">[docs]</a> <span class="k">def</span> <span class="nf">num_features</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns the number of features detected.</span>
<span class="sd"> """</span>
<span class="n">num</span> <span class="o">=</span> <span class="n">c_dim_t</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_features_num</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">num</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">feat</span><span class="p">))</span>
<span class="k">return</span> <span class="n">num</span></div>
<div class="viewcode-block" id="Features.get_xpos"><a class="viewcode-back" href="../../arrayfire.features.html#arrayfire.features.Features.get_xpos">[docs]</a> <span class="k">def</span> <span class="nf">get_xpos</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns the x-positions of the features detected.</span>
<span class="sd"> """</span>
<span class="n">out</span> <span class="o">=</span> <span class="n">Array</span><span class="p">()</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_features_xpos</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">out</span><span class="o">.</span><span class="n">arr</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">feat</span><span class="p">))</span>
<span class="k">return</span> <span class="n">out</span></div>
<div class="viewcode-block" id="Features.get_ypos"><a class="viewcode-back" href="../../arrayfire.features.html#arrayfire.features.Features.get_ypos">[docs]</a> <span class="k">def</span> <span class="nf">get_ypos</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns the y-positions of the features detected.</span>
<span class="sd"> """</span>
<span class="n">out</span> <span class="o">=</span> <span class="n">Array</span><span class="p">()</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_features_ypos</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">out</span><span class="o">.</span><span class="n">arr</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">feat</span><span class="p">))</span>
<span class="k">return</span> <span class="n">out</span></div>
<div class="viewcode-block" id="Features.get_score"><a class="viewcode-back" href="../../arrayfire.features.html#arrayfire.features.Features.get_score">[docs]</a> <span class="k">def</span> <span class="nf">get_score</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns the scores of the features detected.</span>
<span class="sd"> """</span>
<span class="n">out</span> <span class="o">=</span> <span class="n">Array</span><span class="p">()</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_features_score</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">out</span><span class="o">.</span><span class="n">arr</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">feat</span><span class="p">))</span>
<span class="k">return</span> <span class="n">out</span></div>
<div class="viewcode-block" id="Features.get_orientation"><a class="viewcode-back" href="../../arrayfire.features.html#arrayfire.features.Features.get_orientation">[docs]</a> <span class="k">def</span> <span class="nf">get_orientation</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns the orientations of the features detected.</span>
<span class="sd"> """</span>
<span class="n">out</span> <span class="o">=</span> <span class="n">Array</span><span class="p">()</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_features_orientation</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">out</span><span class="o">.</span><span class="n">arr</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">feat</span><span class="p">))</span>
<span class="k">return</span> <span class="n">out</span></div>
<div class="viewcode-block" id="Features.get_size"><a class="viewcode-back" href="../../arrayfire.features.html#arrayfire.features.Features.get_size">[docs]</a> <span class="k">def</span> <span class="nf">get_size</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns the sizes of the features detected.</span>
<span class="sd"> """</span>
<span class="n">out</span> <span class="o">=</span> <span class="n">Array</span><span class="p">()</span>
<span class="n">safe_call</span><span class="p">(</span><span class="n">backend</span><span class="o">.</span><span class="n">get</span><span class="p">()</span><span class="o">.</span><span class="n">af_get_features_size</span><span class="p">(</span><span class="n">c_pointer</span><span class="p">(</span><span class="n">out</span><span class="o">.</span><span class="n">arr</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">feat</span><span class="p">))</span>
<span class="k">return</span> <span class="n">out</span></div></div>
</pre></div>
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