BlurredImage

BlurredImage.java

package main.java.com.linecorp.nakaly;

import java.awt.Graphics2D;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import java.io.ByteArrayOutputStream;

import java.io.File;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Base64;

import javax.imageio.ImageIO;

public class BlurredImage {

    private static final int IMG_WIDTH = 100;
    private static final int IMG_HEIGHT = 200;
    private static final int RESIZE_RATIO = 5;

    public static void main(String... args) throws IOException {

        Path imageFilePath = Paths.get("/Users/ST20142/rhq/github.com/nakaly/sandbox/src/main/resource/", "line_login.png");
        BufferedImage bufferedImage = ImageIO.read(imageFilePath.toFile());


        float[] matrix = new float[400];
        for (int i = 0; i < 400; i++)
            matrix[i] = 1.0f/400.0f;
        Kernel kernel = new Kernel(3, 3,
                                   new float[] {
                                           1f/9f, 1f/9f, 1f/9f,
                                           1f/9f, 1f/9f, 1f/9f,
                                           1f/9f, 1f/9f, 1f/9f});
        BufferedImageOp op = new ConvolveOp( new Kernel(20, 20, matrix), ConvolveOp.EDGE_NO_OP, null );

        BufferedImage blurredImage = op.filter(bufferedImage, null);
        int type = (blurredImage.getTransparency() == Transparency.OPAQUE) ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB;
        int width = blurredImage.getWidth() / RESIZE_RATIO;
        int height = blurredImage.getHeight() / RESIZE_RATIO;
        BufferedImage resizedImage = new BufferedImage(width, height, type);
        Graphics2D g = resizedImage.createGraphics();
        g.drawImage(bufferedImage, 0, 0, width, height, null);
        g.dispose();
        File outputfile = new File("blurred_image.png");
        ImageIO.write(resizedImage, "png", outputfile);


//        final ByteArrayOutputStream os = new ByteArrayOutputStream();
//        try
//        {
//            ImageIO.write(blurredImage, "png", os);
//            System.out.println(Base64.getEncoder().encodeToString(os.toByteArray()));
//        }
//        catch (final IOException ioe)
//        {
//            throw new UncheckedIOException(ioe);
//        }
    }
}