rd">inline</span> cv::Mat <a class="code" href="namespacefb360__dep_1_1cv__util.html#a0231466832b9b8aa221024292668dc51">extractAlpha</a>(<span class="keyword">const</span> cv::Mat&amp; src) {</div><div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;  CHECK_EQ(src.channels(), 4) &lt;&lt; <span class="stringliteral">&quot;no alpha channel!&quot;</span>;</div><div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;  cv::Mat alpha;</div><div class="line"><a name="