Ví dụ xói mòn ảnh (Image Erosion) OpenCV Java

Xói mòn (erosion) loại bỏ pixel ở biên ảnh. Dùng Imgproc.erode() với 3 Mat: nguồn, đích, kernel (tương tự dilation).

Ví dụ (JavaFX)

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.image.ImageView;
import javafx.scene.image.WritableImage;
import javafx.stage.Stage;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.Size;
import org.opencv.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

public class ImageErosion extends Application {
    public void start(Stage stage) throws IOException {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        String file = "D:\\Images\\lamma2.jpg";
        Mat src = Imgcodecs.imread(file);
        Mat dst = new Mat(src.rows(), src.cols(), src.type());
        Mat kernel = Imgproc.getStructuringElement(Imgproc.MORPH_RECT, new Size((2*2)+1, (2*2)+1));
        Imgproc.erode(src, dst, kernel);
        Image img = HighGui.toBufferedImage(dst);
        WritableImage writableImage = SwingFXUtils.toFXImage((BufferedImage) img, null);
        ImageView imageView = new ImageView(writableImage);
        imageView.setX(10); imageView.setY(10);
        imageView.setFitWidth(575); imageView.setPreserveRatio(true);
        Group root = new Group(imageView);
        Scene scene = new Scene(root, 595, 400);
        stage.setTitle("Erosion Example");
        stage.setScene(scene);
        stage.show();
    }
    public static void main(String args[]) { launch(args); }
}

Ảnh gốc

Ảnh sau xói mòn