Convert Android Bitmap to OpenCV Mat and backwards

Question

I wanted to simply convert a bitmap from Android to a Mat object for OpenCV. This topic is often adressed on Stack Overflow. For example:

convert Mat to Bitmap Opencv fo

Answer 1

You only can do your work with OpenCV after it is initialized. So you need to initialize it like that:

1.Create a Callback:

private BaseLoaderCallback mOpenCVCallBack = new BaseLoaderCallback(this) {
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
        case LoaderCallbackInterface.SUCCESS:
            //DO YOUR WORK/STUFF HERE 
            break;
        default:
            super.onManagerConnected(status);
            break;
        }
    }
};

2.You need to initialize the callback in the onResume Method of your Activity:

@Override
    protected void onResume() {
        super.onResume();
        OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_8, this,
                mOpenCVCallBack);
    }

and thats it, i hope it was helpful :D

Answer 2

you should add OpenCV lib dependecy to your android prj config(properties->Android->Library ->add [opencv andrid prg])