Dans un environnement OpenCv4Android
, lorsque je crée une image Mat
et que j'utilise Core.line()
pour dessiner sur l'image, elle affiche toujours un blanc au lieu de la couleur que je spécifie.OpenCv Core.line dessine blanc lorsque la couleur est attendue
J'ai vu a question related to gray scale, mais l'image que j'ai n'a pas été converti en gris.
public class DrawingTest extends AppCompatActivity {
public static final Scalar GREEN = new Scalar(0,255,0);
private RelativeLayout mLayout;
private ImageView imageView;
static {
System.loadLibrary("opencv_java");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawing_test);
mLayout = (RelativeLayout) findViewById(R.id.activity_drawing_test);
mLayout.setDrawingCacheEnabled(true);
imageView = (ImageView) this.findViewById(imageView_dt);
//test.jpg is in the drawable-nodpi folder, is an normal color jpg image.
int drawableResourceId = getResources().getIdentifier("test", "drawable", getPackageName());
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), drawableResourceId);
//Mat matImage = new Mat(); // Also white
Mat matImage = new Mat(bitmap.getHeight(), bitmap.getWidth(), CV_8UC4);
Utils.bitmapToMat(bitmap, matImage);
// Attempt to draw a GREEN box, but it comes out white
Core.line(matImage, new Point(new double[]{100,100}), new Point(new double[]{100, 200}), GREEN,4);
Core.line(matImage, new Point(new double[]{100,200}), new Point(new double[]{200, 200}), GREEN,4);
Core.line(matImage, new Point(new double[]{200,200}), new Point(new double[]{200, 100}), GREEN,4);
Core.line(matImage, new Point(new double[]{200,100}), new Point(new double[]{100, 100}), GREEN,4);
Bitmap bitmapToDisplay = Bitmap.createBitmap(matImage.cols(), matImage.rows(), Bitmap.Config.ARGB_8888);
Utils.matToBitmap(matImage, bitmapToDisplay);
imageView.setImageBitmap(bitmapToDisplay);
}
}