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    <p>Can you post some code? A CPU implementation can be found in the samples/cpp folder called matcher_simple.cpp. Are you able to run that? I also have run the GPU version of SURF on OpenCV with no problem using:</p> <pre><code>SURF_GPU surf(1000, 4, 2, false, 0.5); // detecting keypoints &amp; computing descriptors GpuMat keypoints1GPU, keypoints2GPU; GpuMat descriptors1GPU, descriptors2GPU; surf(img1, GpuMat(), keypoints1GPU, descriptors1GPU); surf(img2, GpuMat(), keypoints2GPU, descriptors2GPU); cout &lt;&lt; "FOUND " &lt;&lt; keypoints1GPU.cols &lt;&lt; " keypoints on first image" &lt;&lt; endl; cout &lt;&lt; "FOUND " &lt;&lt; keypoints2GPU.cols &lt;&lt; " keypoints on second image" &lt;&lt; endl; // matching descriptors BruteForceMatcher_GPU&lt; L2&lt;float&gt; &gt; matcher; GpuMat trainIdx, distance; matcher.matchSingle(descriptors1GPU, descriptors2GPU, trainIdx, distance); // downloading results vector&lt;KeyPoint&gt; keypoints1, keypoints2; vector&lt;float&gt; descriptors1, descriptors2; vector&lt;DMatch&gt; matches; surf.downloadKeypoints(keypoints1GPU, keypoints1); surf.downloadKeypoints(keypoints2GPU, keypoints2); surf.downloadDescriptors(descriptors1GPU, descriptors1); surf.downloadDescriptors(descriptors2GPU, descriptors2); BruteForceMatcher_GPU&lt; L2&lt;float&gt; &gt;::matchDownload(trainIdx, distance, matches); // drawing the results Mat img_matches, image1, image2; img1.download(image1); img2.download(image2); drawMatches(image1, keypoints1, image2, keypoints2, matches, img_matches); </code></pre>
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