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I am using opencv 3.2 for Java (build source with contrib modules), and trying to use SURF + BOWKMeansTrainer for detect, but it throws an error when I run it.

My code:

//read jpg to variable trainMats
//...

//train
Mat allDesc = new Mat();
int clusterCount = 30;
FeatureDetector detector = FeatureDetector.create(FeatureDetector.SURF);
DescriptorExtractor extractor = DescriptorExtractor.create(DescriptorExtractor.SURF);
BOWTrainer bowTrainer = new BOWKMeansTrainer(clusterCount);

for(int i = 0; i < trainMats.size(); i++) {
    Mat trainMat = trainMats.get(i);
    MatOfKeyPoint matOfKeyPoint = new MatOfKeyPoint();
    Mat desc = new Mat();
    detector.detect(trainMat, matOfKeyPoint);
    extractor.compute(trainMat, matOfKeyPoint, desc);
    allDesc.push_back(desc);
}

Mat dictionary = bowTrainer.cluster(allDesc);

//...

throw error:

Exception in thread "main" java.lang.Exception: unknown exception
    at org.opencv.features2d.BOWKMeansTrainer.cluster_1(Native Method)
    at org.opencv.features2d.BOWKMeansTrainer.cluster(BOWKMeansTrainer.java:62)
user7610742
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1 Answers1

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Is by the OpenCV version. Try using 2.4.11

Marichelo García
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