OpenCV -闭合轮廓(Java)

import org.opencv.core.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

public class ClosedContourExample {
    static {
        // Load the native OpenCV library
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
    }

    public static void main(String[] args) {
        // Load an image
        Mat src = Imgcodecs.imread("path_to_your_image.jpg");
        if (src.empty()) {
            System.out.println("Could not open or find the image!");
            System.exit(-1);
        }

        // Convert to grayscale
        Mat gray = new Mat();
        Imgproc.cvtColor(src, gray, Imgproc.COLOR_BGR2GRAY);

        // Apply GaussianBlur to reduce noise and improve contour detection
        Mat blurred = new Mat();
        Imgproc.GaussianBlur(gray, blurred, new Size(5, 5), 0);

        // Use Canny edge detector
        Mat edges = new Mat();
        Imgproc.Canny(blurred, edges, 50, 150);

        // Find contours
        List<MatOfPoint> contours = new ArrayList<>();
        Mat hierarchy = new Mat();
        Imgproc.findContours(edges, contours, hierarchy, Imgproc.RETR_TREE, Imgproc.CHAIN_APPROX_SIMPLE);

        // Draw contours on the original image
        Mat drawing = Mat.zeros(edges.size(), CvType.CV_8UC3);
        for (int i = 0; i < contours.size(); i++) {
            Imgproc.drawContours(drawing, contours, i, new Scalar(0, 255, 0), 2, 8, hierarchy, 0, new Point());
        }

        // Save or display the result
        Imgcodecs.imwrite("output.jpg", drawing);
        // Alternatively, you can use HighGui to display the image
        // HighGui.imshow("Contours", drawing);
        // HighGui.waitKey();
    }
}