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    <p>For those who don't read the comments or didn't see it the solution is to use: </p> <p><code>vector&lt;cv::vector&lt;int&gt; &gt;hull;</code> </p> <p>to create the hull instead of:</p> <p><code>vector&lt;cv::vector&lt;Point&gt; &gt;hull;</code></p> <p>as convexityDefects only works on hulls stored as a series of indices rather than a series of Points.</p> <p>Sadly this gives another problem as drawContours only draws contours stored as a series of Points and not as a series of indices! So if you want to draw your hulls at a later stage you may want to create 2 stores when you are finding the hulls, one for drawing and one for finding defects from. Something along the lines of the following works:</p> <pre><code> // create storage space vector&lt;vector&lt;int&gt; &gt; hullsI(contours.size()); vector&lt;vector&lt;Point&gt; &gt; hullsP(contours.size()); vector&lt;vector&lt;Vec4i&gt; &gt; defects(contours.size()); for(int i = 0; i &lt;contours.size(); ++i){ //find the hulls convexHull(contours[i], hullsI[i], true); convexHull(contours[i], hullsP[i], true); //find the defects convexityDefects(contours[i], hullsI[i], defects[i]); } </code></pre> <p>It may be more efficient to just use a different method to draw the hulls rather than calculating them twice but this was the most elegant way I saw of doing it.</p> <p>Also I'm still getting the hang of C/C++ myself (Java guy) but I believe if you add <code>using namespace cv</code> to the top of the code you can save having to have cv:: throughout your code.</p> <p>Hope I haven't stepped on toes Innuendo, not my intention at all if I have.</p>
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