rednaks's profile - activity

I'm not sure, but I think that the "issue" was introduced since 2.4.0, if it's a bug, that would be really weird that no one noticed that ...

Oh thank you, I didn't notice that, I'll host them somewhere elese.

@break yes, it's me. I posted here because I don't really know if it's a bug or something else.

I'm trying to detect keypoints with ORB everything is fine until I switched to Opencv 2.4.9.

Firts, it seems that the number of keys decresed, and for some images, no keypoints are detected :

This is my code compiled with two version : (2.3.1, 2.4.8 and 2.4.9)

#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/features2d/features2d.hpp>


using namespace cv;


int main(int argc, char **argv){

  Mat img = imread(argv[1]);

  std::vector<KeyPoint> kp;

  OrbFeatureDetector detector;
  detector.detect(img, kp);
  std::cout << "Found " << kp.size() << " Keypoints " << std::endl;

  Mat out;
  drawKeypoints(img, kp, out, Scalar::all(255));

  imshow("Kpts", out);

  waitKey(0);
  return 0;
}

Result : 2.3.1 : Found 152 Keypoints

2.4.9 and 2.4.8 : Found 0 Keypoints

I also tested with a different ORB Constructor, but I get the same result, no KPts. The same constuctor values as in 2.3.1 default's constructor : 2.4.9 (2.4.8) custom constr :

#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/features2d/features2d.hpp>


using namespace cv;


int main(int argc, char **argv){

  Mat img = imread(argv[1]);

  std::vector<KeyPoint> kp;

  // default in 2.4.9 is : ORB(700, 1.2f, 3, 31, 0);
  OrbFeatureDetector detector(500, 1.2f, 8, 31, 0); // default values of 2.3.1
  detector.detect(img, kp);
  std::cout << "Found " << kp.size() << " Keypoints " << std::endl;
  Mat out;
  drawKeypoints(img, kp, out, Scalar::all(255));

  imshow("Kpts", out);

  waitKey(0);
  return 0;
}

Do you have any idea what's happening ? And how can I fix it ?

Thank you.

@Stev Well, I'm planning to distribute the code source (propably github) and now the default package in ubuntu, debian and fedora are using that older version, so I'm trying to make something that could work for every one

@V I'm using opencv 2.3.1-7, is there any MACRO for opencv version ?

Yes I'm talking about nonfree module, my app is using SURF and SIFT.

Hello, we are a team working with diffrent dev environment, most are using Windows, I'm in charge of the intergration of the app and I'm under ubuntu 12.04, and it seems that there is a problem with the nonfree features2D headers. On windows it's located at opencv2/nonfree/features2d.hpp but in ubuntu it's in diffrent location
opencv2/features2d/features2d.hpp

So I'm wondering, does all linux distributions are like ubuntu ? so that I can use opereting system macro to add or not specific headers. PS: I've tried to build opencv2 from sources and the result was like in windows. How can you advice me to make it possible for cross build ?

Thanks