[OpenCV] 04.. OpenCV 평활화와 이진화(feat.JAVA)

JAVA와 OpenCV를 이용하여 이미지 평활화(Equalization)와 이진화(Binarization)를 해보겠습니다.

 

평활화(Equalization)

public static void showEqualizedGrayLenna() {
	try {
		String locGrayLenna = "경로생략/LennaGray.png";
		
		Mat imageGrayLenna = Imgcodecs.imread(locGrayLenna);
		Imgproc.cvtColor(imageGrayLenna, imageGrayLenna, Imgproc.COLOR_BGR2GRAY);
		Mat imageEqualizedGrayLenna = new Mat();
		
		// Equalize Start
		Imgproc.equalizeHist(imageGrayLenna, imageEqualizedGrayLenna);
		// Equalize End

		// Show
		HighGui.imshow("LennaEqualizedGray", imageEqualizedGrayLenna);
		
	} catch (Exception e) {
		e.printStackTrace();
	}
}

실행결과

 

이진화(Binarization)

public static void showBinarizationGrayLenna() {
	try {
		String locGrayLenna = "경로생략/LennaGray.png";
		
		Mat imageGrayLenna = Imgcodecs.imread(locGrayLenna);
		Mat imageBinarizationGrayLenna = new Mat();
		
		// Binarization Start
		Imgproc.threshold(imageGrayLenna, imageBinarizationGrayLenna
        				, 127, 255, Imgproc.THRESH_BINARY);
		// Binarization End

		// Show
		HighGui.imshow("LennaBinarizationGray", imageBinarizationGrayLenna);
		
	} catch (Exception e) {
		e.printStackTrace();
	}
}

실행결과

 

이진화(Binarization) - 보너스 GUI

이진화에 트랙바를 추가하여 임계값(Threshold)을 조절하는 프로그램입니다.

public static void showBinarizationGrayLennaWithTrackbar() {
	
	try {
		String locGrayLenna = "경로생략/LennaGray.png";
		
		Mat imageGrayLenna = Imgcodecs.imread(locGrayLenna);
		Mat imageBinarizationGrayLenna = new Mat();
		
		// Binarization Start
		Imgproc.threshold(imageGrayLenna, imageBinarizationGrayLenna
        				, 127, 255, Imgproc.THRESH_BINARY);
		// Binarization End

		// Show
		JFrame trackbarWindow = new JFrame("BinarizationGrayLennaWithTrackbar");

		trackbarWindow.setBounds(100, 100, 528, 582);
		trackbarWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		trackbarWindow.getContentPane().setLayout(null);
		
		// 이미지
		Image img = HighGui.toBufferedImage(imageBinarizationGrayLenna);
		JLabel imgLabel = new JLabel(new ImageIcon(img));
		imgLabel.setBounds(0, 31, 512, 512);
		
		trackbarWindow.getContentPane().add(imgLabel);
		
		// 임계값 텍스트
		JLabel levelLabel = new JLabel("임계값 : " + 127);
		levelLabel.setBounds(10, 10, 75, 15);
		trackbarWindow.getContentPane().add(levelLabel);
		
		// 트랙바
		JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 255, 127);
		slider.setBounds(86, 5, 410, 26);
		slider.addChangeListener(new ChangeListener() {
			public void stateChanged(ChangeEvent e) {
				JSlider source = (JSlider)e.getSource();
				int level = (int)source.getValue();
				//System.out.println(level);
				// Binarization Start
				Imgproc.threshold(imageGrayLenna, imageBinarizationGrayLenna
                				,level, 255, Imgproc.THRESH_BINARY);
				// Binarization End
				Image img = HighGui.toBufferedImage(imageBinarizationGrayLenna);
				levelLabel.setText("임계값 : " + level);
				imgLabel.setIcon(new ImageIcon(img));
				trackbarWindow.repaint();
			}
		});
		trackbarWindow.getContentPane().add(slider, BorderLayout.NORTH);
		trackbarWindow.setVisible(true);
	} catch (Exception e) {
		e.printStackTrace();
	}
}

 

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실행결과