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POOpenCV Flann problems with AutotunedIndexParams
 

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  1. POOpenCV Flann problems with AutotunedIndexParams
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    <p>I have a problem with openCV 2.4.2 flann indexing with AutotunedIndexParams. If i use multiple images to create an index the program exits with the output:</p> <pre><code>trees : 1 terminate called throwing an exception </code></pre> <p>Thats a similar error I get for the equal code in JavaCV where the error is the following:</p> <pre><code>trees : 1 Exception in thread "main" java.lang.RuntimeException: Missing parameter 'algorithm' in the parameters given at com.googlecode.javacv.cpp.opencv_flann$Index.allocate(Native Method) at com.googlecode.javacv.cpp.opencv_flann$Index.&lt;init&gt;(opencv_flann.java:229) </code></pre> <p>In openCVs miniflann.cpp I found multiple lines where <code>p["algorithm"]</code>is being set, may be that hast something to do with the problem?</p> <p>For testing here my C++ Code, I'll post the java code as well if needed ;-)</p> <pre><code>#include &lt;iostream&gt; #include &lt;opencv2/core/core.hpp&gt; #include &lt;opencv2/features2d/features2d.hpp&gt; #include &lt;opencv2/highgui/highgui.hpp&gt; #include &lt;opencv2/nonfree/nonfree.hpp&gt; #include &lt;opencv2/objdetect/objdetect.hpp&gt; #include &lt;opencv2/flann/flann.hpp&gt; using namespace cv; using namespace std; using namespace flann; int main( int argc, char** argv ) { string pathToImages = "/Users/anubis/Desktop/KeypointTest/"; string img_1 = "book_001_canon.jpg"; string img_2 = "book_002_canon.jpg"; string img_3 = "book_003_canon.jpg"; string img_4 = "book_004_canon.jpg"; Mat db_image_1 = imread(pathToImages + img_1, CV_LOAD_IMAGE_COLOR); Mat db_image_2 = imread(pathToImages + img_2, CV_LOAD_IMAGE_COLOR); Mat db_image_3 = imread(pathToImages + img_3, CV_LOAD_IMAGE_COLOR); Mat db_image_4 = imread(pathToImages + img_4, CV_LOAD_IMAGE_COLOR); vector&lt;KeyPoint&gt; db_keypoints_1; vector&lt;KeyPoint&gt; db_keypoints_2; vector&lt;KeyPoint&gt; db_keypoints_3; vector&lt;KeyPoint&gt; db_keypoints_4; Mat db_descriptors_1; Mat db_descriptors_2; Mat db_descriptors_3; Mat db_descriptors_4; Mat db_descriptor; SurfFeatureDetector detector(400, 4, 2, true, true); SurfDescriptorExtractor extractor; detector.detect(db_image_1, db_keypoints_1); detector.detect(db_image_2, db_keypoints_2); detector.detect(db_image_3, db_keypoints_3); detector.detect(db_image_4, db_keypoints_4); extractor.compute(db_image_1, db_keypoints_1, db_descriptors_1); extractor.compute(db_image_2, db_keypoints_2, db_descriptors_2); extractor.compute(db_image_3, db_keypoints_3, db_descriptors_3); extractor.compute(db_image_4, db_keypoints_4, db_descriptors_4); db_descriptor.push_back(db_descriptors_1); db_descriptor.push_back(db_descriptors_2); db_descriptor.push_back(db_descriptors_3); db_descriptor.push_back(db_descriptors_4); IndexParams indexParams = *new AutotunedIndexParams(); Index flannIndex = *new Index(db_descriptor, indexParams); return 0; } </code></pre> <p>The images can be found here: <a href="http://imgur.com/a/l3lfg#Ga99D" rel="nofollow">images</a></p>
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    1. COI did not manage to reproduce your issue with Opencv 2.4.2. Which platform are you working on?
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    2. COI am working on OSX. Did the code work correct for your platform?
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    3. COYes, I managed to run it successfuly on Ubuntu 12.04.
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