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2019-04-30 03:55:17 -0500 edited question Adapt the intrinsic parameters according to the resolution

Adapt the intrinsic parameters according to the resolution Hello, I want to use my intrinsic camera's calibration at 64

2019-04-30 03:26:12 -0500 asked a question Adapt the intrinsic parameters according to the resolution

Adapt the intrinsic parameters according to the resolution Hello, I want to use my intrinsic camera's calibration at 64

2019-02-04 02:39:36 -0500 commented answer Triangulation from spheric model

As I quickly look, the example you gave me, is based on Pin hole model and not on Mei calibration model.

2019-02-04 02:37:54 -0500 received badge  Supporter (source)
2019-02-04 02:37:50 -0500 commented question How to use cv::flann (radiusSearch) to find all neighbouring points within radius r in 2D using Euclidean distance

I modify radiusSearch to knnSearch and It works: std::vector<int> indices; std::vector<flo

2019-02-03 15:32:11 -0500 received badge  Student (source)
2019-02-03 14:28:26 -0500 asked a question Triangulation from spheric model

Triangulation from spheric model Hello I use Mei calibration which create unified camera modelisation. I want to trian

2019-02-03 14:19:26 -0500 marked best answer Get nearest neighbors

Hello,

The problem we will discuss is pretty common, I want to search the nearest neighbors with Opencv. I found dozens of example but the program always sends me wrong informations.

here is the example I get:

std::vector<cv::Point2f> pointsForSearch;

for (int c = 100; c < 640; c += 100) {
    for (int l = 100; l < 640; l += 100) {
        pointsForSearch.emplace_back(cv::Point2f(float(c), float(l)));
    }
}

cv::Mat_<float> features(0,2);

 for(auto && point : pointsForSearch) {

   //Fill matrix
   cv::Mat row = (cv::Mat_<float>(1, 2) << point.x, point.y);
   features.push_back(row);
 }
 std::cout << features << std::endl;

 cv::flann::Index flann_index(features, cv::flann::KDTreeIndexParams(1));


 unsigned int max_neighbours = 10;
 cv::Mat query = (cv::Mat_<float>(1, 2) << 313.0, 245.6);
 cv::Mat indices, dists; //neither assume type nor size here !
 double radius= 2000.0;

 flann_index.radiusSearch(query, indices, dists, radius, max_neighbours,
     cv::flann::SearchParams(32));

 std::cerr << indices.type() << std::endl << indices << std::endl;
 std::cerr << dists.type() << std::endl << dists << std::endl;

The result is :

4
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
5
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

The result is alway zero. What is wrong with the previous example?

2019-02-03 14:19:26 -0500 received badge  Scholar (source)
2019-01-31 07:41:45 -0500 asked a question Get nearest neighbors

Get nearest neighbors Hello, The problem we will discuss is pretty common, I want to search the nearest neighbors with

2019-01-14 07:31:45 -0500 commented answer Extract rotation and translation from Fundamental matrix

I will see for the omnidirectional and fisheye problems. I modify my program with 3D data (not planar data) and the esti

2019-01-13 10:08:47 -0500 commented answer Extract rotation and translation from Fundamental matrix

Thank you really push for the explanation. Do you think we could do the same with Mei calibrated lens model? The fundam

2019-01-10 13:26:14 -0500 asked a question Extract rotation and translation from Fundamental matrix

Extract rotation and translation from Fundamental matrix Hello, I try to extract rotation and translation from my simul

2018-12-28 02:40:27 -0500 asked a question Maximum fisheye degree for Opencv Calibration

Maximum fisheye degree for Opencv Calibration Hello, I want to use a 220 degrees fisheyes lens on my camera. I also wan

2017-11-20 01:57:50 -0500 received badge  Enthusiast
2017-11-18 22:02:07 -0500 commented answer Hog detector for hand recognition

What are the negative example you selected? Did you try that with more complexe background ?

2017-11-18 11:20:55 -0500 commented question Hog detector for hand recognition

I finally manage to learn the svm network but it doesn t work property. I don t know if it comes from the dataset or the

2017-11-17 06:11:44 -0500 commented question Hog detector for hand recognition

Where could I get example of use of that train_HOG example?

2017-11-17 04:34:50 -0500 commented question Hog detector for hand recognition

I have also wrong behaviors. What should be the size of the dataset?

2017-11-17 04:04:55 -0500 commented question Hog detector for hand recognition

The images should have a multiply of 8 for the size?

2017-11-17 04:04:48 -0500 commented question Hog detector for hand recognition

The image should have a multiply of 8 for the size?

2017-11-17 02:17:51 -0500 received badge  Editor (source)
2017-11-17 02:17:51 -0500 edited question Hog detector for hand recognition

Hog detector for hand recognition Hello, I am trying to detect hand in images thanks to Hog detection and SVM network.

2017-11-15 13:08:47 -0500 asked a question Hog detector for hand recognition

Hog detector for hand recognition Hello, I am trying to detect hand in images thanks to Hog detection and SVM network.

2015-07-26 11:25:46 -0500 asked a question Undistor algorithm on OpenCV

Hello,

I would like to get more information about undistor algorithm used on OpenCV.

Here is the source of the program:

https://github.com/Itseez/opencv/blob...

Where could I get paper on the algorithm used for undistor points?

Best regard.