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PODoes Bruteforce matching work with FREAK descriptors?
 

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  1. PODoes Bruteforce matching work with FREAK descriptors?
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    <p>I've been making an application on the smartphone for Android, where 2 images can be compared (one on the SD card, one from the camera). There I use a FREAK descriptor on a limited amount of keypoints (i filtered out the 500 best ones according to the response). When I try to match it with BRUTEFORCE_SL2, it gives back 0 matches.</p> <p>Is this because FREAK and Bruteforce don't work well together? Or did I do something wrong in the code?</p> <p>Matching happens with</p> <pre><code>MatOfDMatch matches = new MatOfDMatch(); matcher = DescriptorMatcher.create(DescriptorMatcher.BRUTEFORCE_SL2); matcher.match(descriptors,descriptors1,matches); MatOfDMatch goedematches = new MatOfDMatch(); double max_dist = 0; double min_dist = 100; //if (descriptors.cols() == descriptors1.cols()) //{ for( int i = 0; i &lt; descriptors.rows(); i++ ) { double dist = matches.toArray()[i].distance; if( dist &lt; min_dist ) min_dist = dist; if( dist &gt; max_dist ) max_dist = dist; } // should only draw good matches for( int i = 0; i &lt; descriptors.rows(); i++ ) { MatOfDMatch temp = new MatOfDMatch(); if( matches.toArray()[i].distance &lt; 3*min_dist ) { temp.fromArray(matches.toArray()[i]); goedematches.push_back(temp); } // } } Log.d("LOG!", "Number of good matches= " + goedematches.size()); </code></pre> <p>When I just do the </p> <pre><code>matcher.match(descriptors,descriptors1,matches); </code></pre> <p>and read out the matches with</p> <pre><code>Log.d("LOG!", "Number of good matches= " + matches.size()); </code></pre> <p>I get about 450 even if I take a picture of something that doesn't even look like my image.</p>
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