OpenCV的java绑定显示图片

虽然opencv已经原生支持java但是还有一部分api没有实现，比如显示图片的api就没有，这时就需要使用swing或awt来显示图片了。

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.InputStream;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.MatOfByte;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.highgui.Highgui;

public class Main {
public static void showResult(Mat img) {
    //Imgproc.resize(img, img, new Size(640, 480));
    MatOfByte matOfByte = new MatOfByte();
    Highgui.imencode(".jpg", img, matOfByte);
    byte[] byteArray = matOfByte.toArray();
    BufferedImage bufImage = null;
    try {
        InputStream in = new ByteArrayInputStream(byteArray);
        bufImage = ImageIO.read(in);
        JFrame frame = new JFrame();
        frame.getContentPane().add(new JLabel(new ImageIcon(bufImage)));
        frame.pack();
        frame.setVisible(true);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

    public static void main(String[] args) {
        System.out.println("Welcome to OpenCV " + Core.VERSION);
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        //Mat m  = Mat.eye(3, 3, CvType.CV_8UC1);

        Mat img  = Mat.ones(200, 200, CvType.CV_8UC3);
        img.setTo(new Scalar(255, 255, 255));
        //img.setTo(new Scalar(0, 0, 0));
        Point p1 = new Point(10, 10);
        Point p2 = new Point(150, 150);
        //Rect rect = new Rect(p1, p2);
       // img.create(200, 200, CvType.CV_16U);
        Core.rectangle(img, p1, p2, new Scalar(255, 0, 0),5);
        Core.line(img, new Point(30,30),new Point(100,100), new Scalar(0,255, 100));
        String filename = "test.jpg";
        Highgui.imwrite(filename, img);
        showResult(img);


        //System.out.println("m = " + img.dump());
    }

}