OpenCV: Why SIFT and SURF detectors crashes?

Question

Why do the SIFT and SURF detectors crash?

using namespace std;
using namespace cv;

int main(int argc, char *argv[])
{        
  Mat image = imread("TestImage.jpg");

  // Create smart pointer for SIFT feature detector.
  Ptr<FeatureDetector> featureDetector = FeatureDetector::create("SIFT");
  vector<KeyPoint> keypoints;

  // Detect the keypoints
  featureDetector->detect(image, keypoints); // here crash
  // ...
}

The error is Segmentation fault (core dumped). I use OpenCV 2.4.8, gcc 4.9 and Ubuntu. If I use the other types of features it runs normally. What am I missing?

I don't know - check the docs - what I was referring to though was the fact that there was no error checking to see whether `image` had been loaded successfully. — Paul R, May 13 '14 at 12:08
SIFT/SURF are extracted on grayscale images, althought I'm not sure you need to pass a grayscale image explicitely. But this would have crashed with an exception, not core dumped — remi, May 13 '14 at 12:10

remi · Accepted Answer · 2014-05-13T12:15:40.573

10

Have you tried to call initModule_nonfree()?

#include <opencv2/nonfree/nonfree.hpp>
using namespace std;
using namespace cv;

int main(int argc, char *argv[])
{
  initModule_nonfree();
  Mat image = imread("TestImage.jpg");

  // Create smart pointer for SIFT feature detector.
  Ptr<FeatureDetector> featureDetector = FeatureDetector::create("SIFT");
  vector<KeyPoint> keypoints;

  // Detect the keypoints
  featureDetector->detect(image, keypoints); // here crash
  // ...
}

Also, you didnt check the pointer featureDetector which is probably null (since you have not called initModule).

edited May 13 '14 at 12:15

answered May 13 '14 at 12:09

remi

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It seems that `initModule_nonfree()` was the problem... I did not knew about it – thedarkside ofthemoon May 13 '14 at 12:13
fixed my link to the documentation in the answer. – remi May 13 '14 at 12:15
"If you are using the C version", How do I know that? I used just C++ – thedarkside ofthemoon May 13 '14 at 12:18
There is another explanation about calling initModule in [`Algorithm::create`](http://docs.opencv.org/modules/core/doc/basic_structures.html?highlight=algorithm#algorithm-create), I doubt the problem is really about using C/C++ – remi May 13 '14 at 12:24

OpenCV: Why SIFT and SURF detectors crashes?

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