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Explain OpenCV Simple Threshold using Java Example
Thresholding is a simple technique for the segmentation of an image. it is often used to create binary images. In simple thresholding, the pixels greater than a given threshold value will be replaced with a standard value.
The threshold() method performs the simple threshold operation on the given image. Following are the parameters of this method −
Two Mat objects representing the source and destination images.
Two integer variables representing the threshold or the standard value.
An integer variable representing the type of the simple threshold.
Example
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.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
public class SimpleThreshold extends Application {
public void start(Stage stage) throws IOException {
//Loading the OpenCV core library
System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
String file ="D:\Images\win2.jpg";
Mat src = Imgcodecs.imread(file, Imgcodecs.IMREAD_GRAYSCALE);
//Creating an empty matrices to store the destination image.
Mat dst = new Mat(src.rows(), src.cols(), src.type());
//Applying simple threshold
Imgproc.threshold(src, dst, 50, 255, Imgproc.THRESH_BINARY);
//Converting matrix to JavaFX writable image
Image img = HighGui.toBufferedImage(dst);
WritableImage writableImage= SwingFXUtils.toFXImage((BufferedImage) img, null);
//Setting the image view
ImageView imageView = new ImageView(writableImage);
imageView.setX(10);
imageView.setY(10);
imageView.setFitWidth(575);
imageView.setPreserveRatio(true);
//Setting the Scene object
Group root = new Group(imageView);
Scene scene = new Scene(root, 595, 400);
stage.setTitle("Simple Threshold");
stage.setScene(scene);
stage.show();
}
public static void main(String args[]) {
launch(args);
}
}Input Image
Output
On executing, the above program generates the following windows −
Updated on: 13-Apr-2020
232 Views
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