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POC++ compare surf descriptors algorithm match breaks some times
 

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  1. POC++ compare surf descriptors algorithm match breaks some times
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    <p>I wrote a c++ application that compares points matches from images (OpenSurf C++) but some times, 1 from some thousands of "getUniqueMatches", the application breaks in some point inside "getUniqueMatches". I has this log:</p> <pre><code>05/13/11 10:17:16: this-&gt;pointsA = 227 05/13/11 10:17:16: this-&gt;pointsB = 226 05/13/11 10:17:16: this-&gt;matches before = 0 05/13/11 10:17:16: 227 226 0 0.650000 05/13/11 10:17:16: Starting in getUniqueMatches -- And here breaks, inside getUniqueMatches -- </code></pre> <p>And this is the code:</p> <pre><code>inline bool findInVector(std::vector&lt;int&gt; v, int value) { int size = v.size(); for(int i=0; i&lt;size; i++) { if(v[i] == value) { return true; } } return false; } void getUniqueMatches(IpVec &amp;ipts1, IpVec &amp;ipts2, IpPairVec &amp;matches, float ratio) { try { wLog(f("%d %d %d %f", ipts1.size(), ipts2.size(), matches.size(), ratio)); float dist, d1, d2; Ipoint *match; matches.clear(); std::vector&lt;int&gt; matched; wLog("Starting in getUniqueMatches"); // Breaks after here int size = ipts1.size(); int size2 = ipts2.size(); for (int i = 0; i &lt; size; i++) { d1 = d2 = FLT_MAX; int foundJ = -1; for (unsigned int j = 0; j &lt; size2; j++) { dist = ipts1[i] - ipts2[j]; if (dist &lt; d1 &amp;&amp; !findInVector(matched, j)) { d2 = d1; d1 = dist; match = &amp;ipts2[j]; foundJ = j; } else if (dist &lt; d2) { d2 = dist; } } if (d1 / d2 &lt; ratio) { ipts1[i].dx = match-&gt;x - ipts1[i].x; ipts1[i].dy = match-&gt;y - ipts1[i].y; matches.push_back(std::make_pair(ipts1[i], *match)); matched.push_back(foundJ); } } } catch(std::exception ex) { wLog(f("Exception in getUniqueMatches: ", ex.what())); return; } } </code></pre> <p>Only some times breaks here. I don't know what is happening, maybe something wrong? The application uses only 1 thread when executing this function. When extracting points uses 10 threads.</p> <p>Using it on Centos5 (VPS). 2 Gb RAm 20% hd used Compiled using g++ (Performance mode), IDE used Netbeans. OpenCV, libcurl.</p>
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    1. USWiliam
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      1. VTUpMod
    1. COCan't see anything obvious, have you tried more logging? As an aside I would use find in findInVector(), it uses iterators.
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      1. USColWhi
    2. CO@Sasquiha, logging inside will be crazy, because not all time crashes inside and logging inside iterators will generate very big log files. Nothing obvious then?
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      1. USWiliam
    3. COit is possible the break is not in this function. What does the core file say?
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      1. USColWhi
 

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