openCV4Android features2d error

openCV4Android features2d error

By : user2951391
Date : November 18 2020, 11:13 AM
This might help you The problem is, that you give a filtered list (i.e. matOfSceneGoodKeyPoints) to drawMatches(). But the good matches list gm contains indices based on the original lists. So change to
code :
Features2d.drawMatches(gray1, keypoints_object, gray2,
keypoints_scene, gm, outputImg, Scalar.all(-1), RED,
drawnMatches, Features2d.NOT_DRAW_SINGLE_POINTS);

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What is my error using opencv4android and haarcascade

What is my error using opencv4android and haarcascade

By : WayneDarley
Date : March 29 2020, 07:55 AM
To fix this issue you can't use opencv code, until the BaseLoader finished loading the native libs
code :
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
    public void onManagerConnected(int status) {
        if (status == LoaderCallbackInterface.SUCCESS ) {

            // now we can call opencv code !

        } else {

public void onResume() {;
    OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_5,this, mLoaderCallback);
    // you may be tempted, to do something here, but it's *async*, and may take some time,
    // so any opencv call here will lead to unresolved native errors.
OpenCV4Android - find/drawContour error

OpenCV4Android - find/drawContour error

By : user3389316
Date : March 29 2020, 07:55 AM
this will help Dimensions of Bitmap has to match the dimensions of OpenCV Mat. I suggest you create Bitmap as below.
code :
Bitmap bitmapImg = Bitmap.createBitmap( matImg.cols(), matImg.rows(), Bitmap.Config.ARGB_8888 );
error /usr/include/opencv2/nonfree/features2d.hpp error vector in opencv on ubuntu

error /usr/include/opencv2/nonfree/features2d.hpp error vector in opencv on ubuntu

By : Dustin Bernard
Date : March 29 2020, 07:55 AM
it helps some times This code is surf algorithm of Opencv. My code is not working. I am using Ubuntu 14.04.2 with Opencv 3.0.0 and gcc/g++ 4.8.4. I want to complie on "surf algorithm" , Include header file vector
code :
  #include <vector>
Features2D + Homography OpenCV linking error

Features2D + Homography OpenCV linking error

By : Ved Peer
Date : March 29 2020, 07:55 AM
should help you out @uelordi for the support.
I had placed jni folder in root of project directory, so after compiling with ndk-build, I copied the generated *.so files from libs folder (generated after compilation in the same directory) to myapp/src/main/jniLibs and I can now run the OpenCV code. I hope it might help someone.
Opencv4Android getPerspectiveTransform error

Opencv4Android getPerspectiveTransform error

By : Nikhil Joshi
Date : March 29 2020, 07:55 AM
I wish did fix the issue. As mentioned in the comment discussion on OP's post (all credit to them), the problem lies with the list l:
code :
List<Point> l = new ArrayList<Point>();
for (int i = 0; i < pts_1.length; i++) {
    Point pt = new Point(pts_1[0][i], pts_1[1][i]);
Mat mat1 = Converters.vector_Point2f_to_Mat(l);
for (Point pt : l)
    System.out.println("(" + pt.x + ", " + p.ty + ")");

(x0, y0)
(x1, y1)
(x2, y2)
(x3, y3)
for (int i = 0; i < pts_2.length; i++) {
    Point pt = new Point(pts_2[0][i], pts_2[1][i]);
Mat mat2 = Converters.vector_Point2f_to_Mat(l);
for (Point pt : l)
    System.out.println("(" + pt.x + ", " + p.ty + ")");

(x4, y4)
(x5, y5)
(x6, y6)
(x7, y7)
(x0, y0)
(x1, y1)
(x2, y2)
(x3, y3)
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