private void CreateDB()
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();

            openFileDialog.Filter      = "JPG|*.jpg|PNG|*.png";
            openFileDialog.Multiselect = true;
            openFileDialog.ShowDialog();
            List <UserFingerprint> userFingerprints = new List <UserFingerprint>();

            foreach (String file in openFileDialog.FileNames)
            {
                Bitmap bitmap = (Bitmap)Bitmap.FromFile(file);
                bitmap = Thinning.Thin(bitmap);
                List <Minutiae> minutiaes = GetMinutiaesFromBitmap(bitmap);
                userFingerprints.Add(new UserFingerprint(file, minutiaes));
            }
            Fingerprints     fingerprints = new Fingerprints(userFingerprints);
            DbJSONSerializer db           = new DbJSONSerializer();

            db.WriteToFile(db.SerializeMinutiaes(fingerprints), "db_fingerprints.json");
        }