jbyteArray myJByteArray = env->NewByteArray(imageToScan.cols * imageToScan.rows);
env->SetByteArrayRegion(myJByteArray, 0, imageToScan.cols * imageToScan.rows, (jbyte *) imageToScan.data);

BitmapFactory.Options options = new BitmapFactory.Options();
    options.outHeight = height;
    options.outWidth = width;
    Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length, options);