A Simple Example of Image Processing Using Java

In this post, we share a simple example of image processing using Java. This example benefits from Java tutorials available from Internet.

This example has three steps: 1) read the input image; 2) image processing; 3) display the processed image.

For step 1, an image is read into image buffer. 

    File file = new File("Lenna.png");
    BufferedImage image = null;

  // Read image
    try
    {
        image = ImageIO.read(file);
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
    System.out.println("done");

Step 2 has a simple operation of image processing. It does 2D convolution filtering for the image using filt3x3 function in the ConvolutionMatrix class.

    // 2D convolution for the image
    double[][] config = {{1,2,1}, {0,0,0}, {-1,-2,-1}};
    ConvolutionMatrix imageConv = new ConvolutionMatrix(3);
    imageConv.applyConfig(config);
    image2 = imageConv.filt3x3(image, imageConv);

Step 3 displays the modified image

    // Display the modified image
    ImageIcon icon=new ImageIcon(image);
    JFrame frame=new JFrame();
    frame.setLayout(new FlowLayout());
    frame.setSize(image.getWidth(),image.getHeight()); //Window.setSize(int width, int height)
    JLabel lbl=new JLabel();
    lbl.setIcon(icon);
    frame.add(lbl);
    frame.setVisible(true);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Java-based image processing is used in many places. Hopefully some people can benefit from this tutorial. The code can be found from here