Ask Your Question

zoenightshade's profile - activity

2018-07-15 22:50:16 -0500 asked a question Stitching panorama images of blank walls

Stitching panorama images of blank walls Hi everyone! Im currently working on a stitching project for Unity. My code wo

2016-06-08 01:23:07 -0500 commented question OpenCV stitching chooses certain image to stitch

I am using the findHomography function instead of the built-in Stitcher. Sorry i forgot to mention it earlier

2016-06-07 22:07:26 -0500 asked a question OpenCV stitching chooses certain image to stitch

My code could stitch these certain 2 images just fine. But when i try to stitch other images, it gives distorted results. Any heads up why?

2016-06-05 19:41:48 -0500 asked a question Panorama stitching in OpenCV returns error.

For some reasons, i keep getting this error. I am able to compile my project successfully but i cant run it because of this error. Any idea why? Thanks in advance.

image description

2016-06-03 00:02:14 -0500 asked a question Native object address is NULL

I dont know where I went wrong with this one. My script doesnt show any errors but there's something wrong because it keeps returning "Native object address is NULL.

This is my code


public MatOfDMatch matches = new MatOfDMatch();
public MatOfDMatch gm = new MatOfDMatch();
public List <DMatch> good_matches = new List<DMatch>();
public List <Point> objList = new List<Point>();
public List <Point> sceneList = new List<Point>();
public MatOfKeyPoint keypoints_object = new MatOfKeyPoint();
public MatOfKeyPoint keypoints_scene = new MatOfKeyPoint();
public Mat descriptors_object = new Mat();
public Mat descriptors_scene = new Mat();
public Mat result, half;
public MatOfPoint2f obj = new MatOfPoint2f();
public MatOfPoint2f scene = new MatOfPoint2f();


        Mat Mat1 = Highgui.imread(_SavePath + _PreviousPhoto + ".png");
        Mat Mat2 = Highgui.imread(_SavePath + _CurrentPhoto + ".png");

        FeatureDetector fd = FeatureDetector.create(FeatureDetector.ORB);

        fd.detect(Mat1, keypoints_object);
        fd.detect(Mat2, keypoints_scene);
        int con = 3;

        DescriptorExtractor extractor = DescriptorExtractor.create(con);

        extractor.compute(Mat1, keypoints_object, descriptors_object);
        extractor.compute(Mat2, keypoints_scene, descriptors_scene);
        DescriptorMatcher matcher = DescriptorMatcher.create(DescriptorMatcher.BRUTEFORCE_HAMMING);

        matcher.match(descriptors_object, descriptors_scene, matches);


        double max_dist = 0; double min_dist = 100;
        List<DMatch> matchesList = matches.toList();

        //– Quick calculation of max and min distances between keypoints

        for( int i = 0; i < descriptors_object.rows(); i++ )
            double dist = (double) matchesList[i].distance;
            if( dist < min_dist ) min_dist = dist;
            if( dist > max_dist ) max_dist = dist;

        for(int i = 0; i < descriptors_object.rows(); i++){
            if(matchesList[i].distance < 3*min_dist){


        List<KeyPoint> keypoints_objectList = keypoints_object.toList();
        List<KeyPoint> keypoints_sceneList = keypoints_scene.toList();

        for(int i = 0; i < good_matches.Count; i++){



        Mat H = Calib3d.findHomography(obj, scene);

        OpenCVForUnity.Size ims = new OpenCVForUnity.Size(Mat1.cols() + Mat2.cols(), Mat1.rows());
        OpenCVForUnity.Rect rect = new OpenCVForUnity.Rect(0, 0, Mat2.cols(), Mat2.rows());

        result = Mat1.clone();

        Imgproc.warpPerspective(Mat1,result,H, ims);
        half = new Mat(result, rect);
2016-06-02 23:58:55 -0500 commented question Script error for descriptors_1.rows

I fixed it by changing it to 'descriptors_1.rows()'

2016-06-02 19:23:49 -0500 answered a question import OpenCV inside UNITY3D

You have to download the OpenCVForUnity plugin in the Asset Store.

Then integrate it into your project.

using OpenCVForUnity;
2016-06-02 04:05:07 -0500 asked a question OpenCV for Unity doesn't have 'Stitcher'

I cant access the Stitcher. Any idea why?

2016-06-02 01:41:18 -0500 asked a question Script error for descriptors_1.rows

I'm getting an 'Operator "<" cannot be applied to operands of type "int" and "method group" for my line for (int i = 0; i < descriptors_1.rows; i++)

descriptors_1.rows is initialized as Mat.