Unsharp Mask Demo : Image « Advanced Graphics « Java






Unsharp Mask Demo

Unsharp Mask Demo
  
 
 

/*
 * Copyright (c) 2007, Romain Guy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of the TimingFramework project nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.BufferedImageOp;
import java.awt.image.ColorModel;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.awt.GraphicsConfiguration;
import java.awt.Transparency;
import java.awt.Graphics;
import java.awt.GraphicsEnvironment;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
/**
 *
 * @author Romain Guy <romain.guy@mac.com>
 */
public class UnsharpMaskDemo extends JFrame {
    private BufferedImage image;
    private JLabel viewer;
    
    private float amount;
    private int radius;
    private int threshold;

    private JPanel viewerPanel;
    private CardLayout carder;

    private JLabel amountLabel;
    private JLabel radiusLabel;
    private JLabel thresholdLabel;
    
    public UnsharpMaskDemo() {
        super("Unsharp Mask Demo");
        
        UnsharpMaskFilter filter = new UnsharpMaskFilter();
        this.amount = filter.getAmount();
        this.radius = filter.getRadius();
        this.threshold = filter.getThreshold();
        
        loadImage();
        add(buildInstructions(), BorderLayout.NORTH);
        add(buildControls(), BorderLayout.SOUTH);
        add(buildViewer());
        
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        
        pack();
        setResizable(false);
        setLocationRelativeTo(null);
    }
    
    private JComponent buildInstructions() {
        JLabel label = new JLabel("Click the image to see the original.");
        label.setBorder(new EmptyBorder(3, 3, 3, 3));
        return label;
    }
    
    private JComponent buildViewer() {
        viewerPanel = new JPanel(carder = new CardLayout());
        viewer = new JLabel(new ImageIcon(image));
        viewer.addMouseListener(new MouseAdapter() {
            public void mouseReleased(MouseEvent e) {
                carder.show(viewerPanel, "sharp");
            }

            public void mousePressed(MouseEvent e) {
                carder.show(viewerPanel, "original");
            }
        });
        updateViewer();
        
        viewerPanel.add(viewer, "sharp");
        viewerPanel.add(new JLabel(new ImageIcon(image)), "original");
        
        return viewerPanel;
    }
    
    private JComponent buildControls() {
        JPanel panel = new JPanel(new GridBagLayout());
        JSlider slider;
        
        panel.add(amountLabel = new JLabel("Amount: "),
                new GridBagConstraints(0, 0, 1, 1,
                    1.0, 1.0, GridBagConstraints.LINE_START,
                    GridBagConstraints.NONE, new Insets(3, 3, 0, 3), 0, 0));
        panel.add(slider = new JSlider(0, 500, (int) (amount * 100.0f)),
                new GridBagConstraints(0, 1, 1, 1,
                    1.0, 1.0, GridBagConstraints.LINE_START,
                    GridBagConstraints.NONE, new Insets(0, 3, 0, 3), 0, 0));
        slider.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                JSlider slider = (JSlider) e.getSource();
                float amount = slider.getValue() / 100.0f;
                setAmount(amount);
            }
        });
        
        panel.add(radiusLabel = new JLabel("Radius: "),
                new GridBagConstraints(0, 2, 1, 1,
                    1.0, 1.0, GridBagConstraints.LINE_START,
                    GridBagConstraints.NONE, new Insets(3, 3, 0, 3), 0, 0));
        panel.add(slider = new JSlider(1, 50, radius),
                new GridBagConstraints(0, 3, 1, 1,
                    1.0, 1.0, GridBagConstraints.LINE_START,
                    GridBagConstraints.NONE, new Insets(0, 3, 0, 3), 0, 0));
        slider.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                JSlider slider = (JSlider) e.getSource();
                setRadius(slider.getValue());
            }
        });
        
        panel.add(thresholdLabel = new JLabel("Threshold: "),
                new GridBagConstraints(0, 4, 1, 1,
                    1.0, 1.0, GridBagConstraints.LINE_START,
                    GridBagConstraints.NONE, new Insets(3, 3, 0, 3), 0, 0));
        panel.add(slider = new JSlider(0, 255, threshold),
                new GridBagConstraints(0, 5, 1, 1,
                    1.0, 1.0, GridBagConstraints.LINE_START,
                    GridBagConstraints.NONE, new Insets(0, 3, 3, 3), 0, 0));
         slider.addChangeListener(new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                JSlider slider = (JSlider) e.getSource();
                setThreshold(slider.getValue());
            }
        });
        
        return panel;
    }
    
    private void setAmount(float amount) {
        this.amount = amount;
        updateViewer();
    }
    
    private void setRadius(int radius) {
        this.radius = radius;
        updateViewer();
    }
    
    private void setThreshold(int threshold) {
        this.threshold = threshold;
        updateViewer();
    }
    
    private void updateViewer() {
        amountLabel.setText("Amount: " + (int) (amount * 100.0f) + "%");
        radiusLabel.setText("Radius: " + radius  + " pixels");
        thresholdLabel.setText("Threshold: " + threshold + " levels");
        
        UnsharpMaskFilter filter = new UnsharpMaskFilter(amount, radius, threshold);
        viewer.setIcon(new ImageIcon(filter.filter(image, null)));
    }
    
    private void loadImage() {
        try {
            this.image = GraphicsUtilities.loadCompatibleImage(getClass().
                    getResource("A.jpg"));
            this.image = GraphicsUtilities.createThumbnail(this.image, 300);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new UnsharpMaskDemo().setVisible(true);
            } 
        });
    }
}
/*
 * Copyright (c) 2007, Romain Guy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of the TimingFramework project nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


/**
 *
 * @author Romain Guy <romain.guy@mac.com>
 */
class UnsharpMaskFilter extends AbstractFilter {
    private final float amount;
    private final int radius;
    private final int threshold;

    public UnsharpMaskFilter() {
        this(0.7f, 2, 2);
    }

    public UnsharpMaskFilter(float amount, int radius, int threshold) {
        this.amount = amount;
        this.radius = radius;
        this.threshold = threshold;
    }
    
    public float getAmount() {
        return amount;
    }
            
    public int getRadius() {
        return radius;
    }
    
    public int getThreshold() {
        return threshold;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public BufferedImage filter(BufferedImage src, BufferedImage dst) {
        int width = src.getWidth();
        int height = src.getHeight();

        if (dst == null) {
            dst = createCompatibleDestImage(src, null);
        }

        int[] srcPixels = new int[width * height];
        int[] dstPixels = new int[width * height];

        float[] kernel = GaussianBlurFilter.createGaussianKernel(radius);

        GraphicsUtilities.getPixels(src, 0, 0, width, height, srcPixels);
        // horizontal pass
        GaussianBlurFilter.blur(srcPixels, dstPixels, width, height, kernel, radius);
        // vertical pass
        //noinspection SuspiciousNameCombination
        GaussianBlurFilter.blur(dstPixels, srcPixels, height, width, kernel, radius);
        
        // blurred image is in srcPixels, we copy the original in dstPixels
        GraphicsUtilities.getPixels(src, 0, 0, width, height, dstPixels);
        // we compare original and blurred images,
        // and store the result in srcPixels
        sharpen(dstPixels, srcPixels, width, height, amount, threshold);

        // the result is now stored in srcPixels due to the 2nd pass
        GraphicsUtilities.setPixels(dst, 0, 0, width, height, srcPixels);

        return dst;
    }

    static void sharpen(int[] original, int[] blurred, int width, int height,
            float amount, int threshold) {
        
        int index = 0;
        
        int srcR, srcB, srcG;
        int dstR, dstB, dstG;
        
        amount *= 1.6f;
        
        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                int srcColor = original[index];
                srcR = (srcColor >> 16) & 0xFF;
                srcG = (srcColor >>  8) & 0xFF;
                srcB = (srcColor      ) & 0xFF;
                
                int dstColor = blurred[index];
                dstR = (dstColor >> 16) & 0xFF;
                dstG = (dstColor >>  8) & 0xFF;
                dstB = (dstColor      ) & 0xFF;
                
                if (Math.abs(srcR - dstR) >= threshold) {
                    srcR = (int) (amount * (srcR - dstR) + srcR);
                    srcR = srcR > 255 ? 255 : srcR < 0 ? 0 : srcR;
                }
                
                if (Math.abs(srcG - dstG) >= threshold) {
                    srcG = (int) (amount * (srcG - dstG) + srcG);
                    srcG = srcG > 255 ? 255 : srcG < 0 ? 0 : srcG;
                }

                if (Math.abs(srcB - dstB) >= threshold) {
                    srcB = (int) (amount * (srcB - dstB) + srcB);
                    srcB = srcB > 255 ? 255 : srcB < 0 ? 0 : srcB;
                }
                
                int alpha = srcColor & 0xFF000000;
                blurred[index] = alpha | (srcR << 16) | (srcG << 8) | srcB;

                index++;
            }
        }
    }
}
/*
 * Copyright (c) 2007, Romain Guy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of the TimingFramework project nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


/**
 * <p><code>GraphicsUtilities</code> contains a set of tools to perform
 * common graphics operations easily. These operations are divided into
 * several themes, listed below.</p>
 * <h2>Compatible Images</h2>
 * <p>Compatible images can, and should, be used to increase drawing
 * performance. This class provides a number of methods to load compatible
 * images directly from files or to convert existing images to compatibles
 * images.</p>
 * <h2>Creating Thumbnails</h2>
 * <p>This class provides a number of methods to easily scale down images.
 * Some of these methods offer a trade-off between speed and result quality and
 * shouuld be used all the time. They also offer the advantage of producing
 * compatible images, thus automatically resulting into better runtime
 * performance.</p>
 * <p>All these methodes are both faster than
 * {@link java.awt.Image#getScaledInstance(int, int, int)} and produce
 * better-looking results than the various <code>drawImage()</code> methods
 * in {@link java.awt.Graphics}, which can be used for image scaling.</p>
 * <h2>Image Manipulation</h2>
 * <p>This class provides two methods to get and set pixels in a buffered image.
 * These methods try to avoid unmanaging the image in order to keep good
 * performance.</p>
 *
 * @author Romain Guy <romain.guy@mac.com>
 */
class GraphicsUtilities {
    private GraphicsUtilities() {
    }

    // Returns the graphics configuration for the primary screen
    private static GraphicsConfiguration getGraphicsConfiguration() {
        return GraphicsEnvironment.getLocalGraphicsEnvironment().
                    getDefaultScreenDevice().getDefaultConfiguration();
    }

    /**
     * <p>Returns a new <code>BufferedImage</code> using the same color model
     * as the image passed as a parameter. The returned image is only compatible
     * with the image passed as a parameter. This does not mean the returned
     * image is compatible with the hardware.</p>
     *
     * @param image the reference image from which the color model of the new
     *   image is obtained
     * @return a new <code>BufferedImage</code>, compatible with the color model
     *   of <code>image</code>
     */
    public static BufferedImage createColorModelCompatibleImage(BufferedImage image) {
        ColorModel cm = image.getColorModel();
        return new BufferedImage(cm,
            cm.createCompatibleWritableRaster(image.getWidth(),
                                              image.getHeight()),
            cm.isAlphaPremultiplied(), null);
    }

    /**
     * <p>Returns a new compatible image with the same width, height and
     * transparency as the image specified as a parameter.</p>
     *
     * @see java.awt.Transparency
     * @see #createCompatibleImage(int, int)
     * @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
     * @see #createCompatibleTranslucentImage(int, int)
     * @see #loadCompatibleImage(java.net.URL)
     * @see #toCompatibleImage(java.awt.image.BufferedImage)
     * @param image the reference image from which the dimension and the
     *   transparency of the new image are obtained
     * @return a new compatible <code>BufferedImage</code> with the same
     *   dimension and transparency as <code>image</code>
     */
    public static BufferedImage createCompatibleImage(BufferedImage image) {
        return createCompatibleImage(image, image.getWidth(), image.getHeight());
    }

    /**
     * <p>Returns a new compatible image of the specified width and height, and
     * the same transparency setting as the image specified as a parameter.</p>
     *
     * @see java.awt.Transparency
     * @see #createCompatibleImage(java.awt.image.BufferedImage)
     * @see #createCompatibleImage(int, int)
     * @see #createCompatibleTranslucentImage(int, int)
     * @see #loadCompatibleImage(java.net.URL)
     * @see #toCompatibleImage(java.awt.image.BufferedImage)
     * @param width the width of the new image
     * @param height the height of the new image
     * @param image the reference image from which the transparency of the new
     *   image is obtained
     * @return a new compatible <code>BufferedImage</code> with the same
     *   transparency as <code>image</code> and the specified dimension
     */
    public static BufferedImage createCompatibleImage(BufferedImage image,
                                                      int width, int height) {
        return getGraphicsConfiguration().createCompatibleImage(width, height,
                                                   image.getTransparency());
    }

    /**
     * <p>Returns a new opaque compatible image of the specified width and
     * height.</p>
     *
     * @see #createCompatibleImage(java.awt.image.BufferedImage)
     * @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
     * @see #createCompatibleTranslucentImage(int, int)
     * @see #loadCompatibleImage(java.net.URL)
     * @see #toCompatibleImage(java.awt.image.BufferedImage)
     * @param width the width of the new image
     * @param height the height of the new image
     * @return a new opaque compatible <code>BufferedImage</code> of the
     *   specified width and height
     */
    public static BufferedImage createCompatibleImage(int width, int height) {
        return getGraphicsConfiguration().createCompatibleImage(width, height);
    }

    /**
     * <p>Returns a new translucent compatible image of the specified width
     * and height.</p>
     *
     * @see #createCompatibleImage(java.awt.image.BufferedImage)
     * @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
     * @see #createCompatibleImage(int, int)
     * @see #loadCompatibleImage(java.net.URL)
     * @see #toCompatibleImage(java.awt.image.BufferedImage)
     * @param width the width of the new image
     * @param height the height of the new image
     * @return a new translucent compatible <code>BufferedImage</code> of the
     *   specified width and height
     */
    public static BufferedImage createCompatibleTranslucentImage(int width,
                                                                 int height) {
        return getGraphicsConfiguration().createCompatibleImage(width, height,
                                                   Transparency.TRANSLUCENT);
    }

    /**
     * <p>Returns a new compatible image from a URL. The image is loaded from the
     * specified location and then turned, if necessary into a compatible
     * image.</p>
     *
     * @see #createCompatibleImage(java.awt.image.BufferedImage)
     * @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
     * @see #createCompatibleImage(int, int)
     * @see #createCompatibleTranslucentImage(int, int)
     * @see #toCompatibleImage(java.awt.image.BufferedImage)
     * @param resource the URL of the picture to load as a compatible image
     * @return a new translucent compatible <code>BufferedImage</code> of the
     *   specified width and height
     * @throws java.io.IOException if the image cannot be read or loaded
     */
    public static BufferedImage loadCompatibleImage(URL resource)
            throws IOException {
        BufferedImage image = ImageIO.read(resource);
        return toCompatibleImage(image);
    }

    /**
     * <p>Return a new compatible image that contains a copy of the specified
     * image. This method ensures an image is compatible with the hardware,
     * and therefore optimized for fast blitting operations.</p>
     *
     * @see #createCompatibleImage(java.awt.image.BufferedImage)
     * @see #createCompatibleImage(java.awt.image.BufferedImage, int, int)
     * @see #createCompatibleImage(int, int)
     * @see #createCompatibleTranslucentImage(int, int)
     * @see #loadCompatibleImage(java.net.URL)
     * @param image the image to copy into a new compatible image
     * @return a new compatible copy, with the
     *   same width and height and transparency and content, of <code>image</code>
     */
    public static BufferedImage toCompatibleImage(BufferedImage image) {
        if (image.getColorModel().equals(
                getGraphicsConfiguration().getColorModel())) {
            return image;
        }

        BufferedImage compatibleImage =
                getGraphicsConfiguration().createCompatibleImage(
                    image.getWidth(), image.getHeight(),
                    image.getTransparency());
        Graphics g = compatibleImage.getGraphics();
        g.drawImage(image, 0, 0, null);
        g.dispose();

        return compatibleImage;
    }

    /**
     * <p>Returns a thumbnail of a source image. <code>newSize</code> defines
     * the length of the longest dimension of the thumbnail. The other
     * dimension is then computed according to the dimensions ratio of the
     * original picture.</p>
     * <p>This method favors speed over quality. When the new size is less than
     * half the longest dimension of the source image,
     * {@link #createThumbnail(BufferedImage, int)} or
     * {@link #createThumbnail(BufferedImage, int, int)} should be used instead
     * to ensure the quality of the result without sacrificing too much
     * performance.</p>
     *
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int, int)
     * @param image the source image
     * @param newSize the length of the largest dimension of the thumbnail
     * @return a new compatible <code>BufferedImage</code> containing a
     *   thumbnail of <code>image</code>
     * @throws IllegalArgumentException if <code>newSize</code> is larger than
     *   the largest dimension of <code>image</code> or &lt;= 0
     */
    public static BufferedImage createThumbnailFast(BufferedImage image,
                                                    int newSize) {
        float ratio;
        int width = image.getWidth();
        int height = image.getHeight();

        if (width > height) {
            if (newSize >= width) {
                throw new IllegalArgumentException("newSize must be lower than" +
                                                   " the image width");
            } else if (newSize <= 0) {
                 throw new IllegalArgumentException("newSize must" +
                                                    " be greater than 0");
            }

            ratio = (float) width / (float) height;
            width = newSize;
            height = (int) (newSize / ratio);
        } else {
            if (newSize >= height) {
                throw new IllegalArgumentException("newSize must be lower than" +
                                                   " the image height");
            } else if (newSize <= 0) {
                 throw new IllegalArgumentException("newSize must" +
                                                    " be greater than 0");
            }

            ratio = (float) height / (float) width;
            height = newSize;
            width = (int) (newSize / ratio);
        }

        BufferedImage temp = createCompatibleImage(image, width, height);
        Graphics2D g2 = temp.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                            RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g2.drawImage(image, 0, 0, temp.getWidth(), temp.getHeight(), null);
        g2.dispose();

        return temp;
    }

    /**
     * <p>Returns a thumbnail of a source image.</p>
     * <p>This method favors speed over quality. When the new size is less than
     * half the longest dimension of the source image,
     * {@link #createThumbnail(BufferedImage, int)} or
     * {@link #createThumbnail(BufferedImage, int, int)} should be used instead
     * to ensure the quality of the result without sacrificing too much
     * performance.</p>
     *
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int, int)
     * @param image the source image
     * @param newWidth the width of the thumbnail
     * @param newHeight the height of the thumbnail
     * @return a new compatible <code>BufferedImage</code> containing a
     *   thumbnail of <code>image</code>
     * @throws IllegalArgumentException if <code>newWidth</code> is larger than
     *   the width of <code>image</code> or if code>newHeight</code> is larger
     *   than the height of <code>image</code> or if one of the dimensions
     *   is &lt;= 0
     */
    public static BufferedImage createThumbnailFast(BufferedImage image,
                                                    int newWidth, int newHeight) {
        if (newWidth >= image.getWidth() ||
            newHeight >= image.getHeight()) {
            throw new IllegalArgumentException("newWidth and newHeight cannot" +
                                               " be greater than the image" +
                                               " dimensions");
        } else if (newWidth <= 0 || newHeight <= 0) {
            throw new IllegalArgumentException("newWidth and newHeight must" +
                                               " be greater than 0");
        }

        BufferedImage temp = createCompatibleImage(image, newWidth, newHeight);
        Graphics2D g2 = temp.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                            RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g2.drawImage(image, 0, 0, temp.getWidth(), temp.getHeight(), null);
        g2.dispose();

        return temp;
    }

    /**
     * <p>Returns a thumbnail of a source image. <code>newSize</code> defines
     * the length of the longest dimension of the thumbnail. The other
     * dimension is then computed according to the dimensions ratio of the
     * original picture.</p>
     * <p>This method offers a good trade-off between speed and quality.
     * The result looks better than
     * {@link #createThumbnailFast(java.awt.image.BufferedImage, int)} when
     * the new size is less than half the longest dimension of the source
     * image, yet the rendering speed is almost similar.</p>
     *
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int, int)
     * @param image the source image
     * @param newSize the length of the largest dimension of the thumbnail
     * @return a new compatible <code>BufferedImage</code> containing a
     *   thumbnail of <code>image</code>
     * @throws IllegalArgumentException if <code>newSize</code> is larger than
     *   the largest dimension of <code>image</code> or &lt;= 0
     */
    public static BufferedImage createThumbnail(BufferedImage image,
                                                int newSize) {
        int width = image.getWidth();
        int height = image.getHeight();

        boolean isWidthGreater = width > height;

        if (isWidthGreater) {
            if (newSize >= width) {
                throw new IllegalArgumentException("newSize must be lower than" +
                                                   " the image width");
            }
        } else if (newSize >= height) {
            throw new IllegalArgumentException("newSize must be lower than" +
                                               " the image height");
        }

        if (newSize <= 0) {
            throw new IllegalArgumentException("newSize must" +
                                               " be greater than 0");
        }

        float ratioWH = (float) width / (float) height;
        float ratioHW = (float) height / (float) width;

        BufferedImage thumb = image;
        BufferedImage temp = null;

        Graphics2D g2 = null;

        int previousWidth = width;
        int previousHeight = height;

        do {
            if (isWidthGreater) {
                width /= 2;
                if (width < newSize) {
                    width = newSize;
                }
                height = (int) (width / ratioWH);
            } else {
                height /= 2;
                if (height < newSize) {
                    height = newSize;
                }
                width = (int) (height / ratioHW);
            }

            if (temp == null) {
                temp = createCompatibleImage(image, width, height);
                g2 = temp.createGraphics();
                g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            }
            g2.drawImage(thumb, 0, 0, width, height,
                         0, 0, previousWidth, previousHeight, null);

            previousWidth = width;
            previousHeight = height;

            thumb = temp;
        } while (newSize != (isWidthGreater ? width : height));

        g2.dispose();

        if (width != thumb.getWidth() || height != thumb.getHeight()) {
            temp = createCompatibleImage(image, width, height);
            g2 = temp.createGraphics();
            g2.drawImage(thumb, 0, 0, null);
            g2.dispose();
            thumb = temp;
        }

        return thumb;
    }

    /**
     * <p>Returns a thumbnail of a source image.</p>
     * <p>This method offers a good trade-off between speed and quality.
     * The result looks better than
     * {@link #createThumbnailFast(java.awt.image.BufferedImage, int)} when
     * the new size is less than half the longest dimension of the source
     * image, yet the rendering speed is almost similar.</p>
     *
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int)
     * @see #createThumbnailFast(java.awt.image.BufferedImage, int, int)
     * @see #createThumbnail(java.awt.image.BufferedImage, int)
     * @param image the source image
     * @param newWidth the width of the thumbnail
     * @param newHeight the height of the thumbnail
     * @return a new compatible <code>BufferedImage</code> containing a
     *   thumbnail of <code>image</code>
     * @throws IllegalArgumentException if <code>newWidth</code> is larger than
     *   the width of <code>image</code> or if code>newHeight</code> is larger
     *   than the height of <code>image or if one the dimensions is not &gt; 0</code>
     */
    public static BufferedImage createThumbnail(BufferedImage image,
                                                int newWidth, int newHeight) {
        int width = image.getWidth();
        int height = image.getHeight();

        if (newWidth >= width || newHeight >= height) {
            throw new IllegalArgumentException("newWidth and newHeight cannot" +
                                               " be greater than the image" +
                                               " dimensions");
        } else if (newWidth <= 0 || newHeight <= 0) {
            throw new IllegalArgumentException("newWidth and newHeight must" +
                                               " be greater than 0");
        }

        BufferedImage thumb = image;
        BufferedImage temp = null;

        Graphics2D g2 = null;

        int previousWidth = width;
        int previousHeight = height;

        do {
            if (width > newWidth) {
                width /= 2;
                if (width < newWidth) {
                    width = newWidth;
                }
            }

            if (height > newHeight) {
                height /= 2;
                if (height < newHeight) {
                    height = newHeight;
                }
            }

            if (temp == null) {
                temp = createCompatibleImage(image, width, height);
                g2 = temp.createGraphics();
                g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
                                RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            }
            g2.drawImage(thumb, 0, 0, width, height,
                         0, 0, previousWidth, previousHeight, null);

            previousWidth = width;
            previousHeight = height;

            thumb = temp;
        } while (width != newWidth || height != newHeight);

        g2.dispose();

        if (width != thumb.getWidth() || height != thumb.getHeight()) {
            temp = createCompatibleImage(image, width, height);
            g2 = temp.createGraphics();
            g2.drawImage(thumb, 0, 0, null);
            g2.dispose();
            thumb = temp;
        }

        return thumb;
    }

    /**
     * <p>Returns an array of pixels, stored as integers, from a
     * <code>BufferedImage</code>. The pixels are grabbed from a rectangular
     * area defined by a location and two dimensions. Calling this method on
     * an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>
     * and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>
     *
     * @param img the source image
     * @param x the x location at which to start grabbing pixels
     * @param y the y location at which to start grabbing pixels
     * @param w the width of the rectangle of pixels to grab
     * @param h the height of the rectangle of pixels to grab
     * @param pixels a pre-allocated array of pixels of size w*h; can be null
     * @return <code>pixels</code> if non-null, a new array of integers
     *   otherwise
     * @throws IllegalArgumentException is <code>pixels</code> is non-null and
     *   of length &lt; w*h
     */
    public static int[] getPixels(BufferedImage img,
                                  int x, int y, int w, int h, int[] pixels) {
        if (w == 0 || h == 0) {
            return new int[0];
        }

        if (pixels == null) {
            pixels = new int[w * h];
        } else if (pixels.length < w * h) {
            throw new IllegalArgumentException("pixels array must have a length" +
                                               " >= w*h");
        }

        int imageType = img.getType();
        if (imageType == BufferedImage.TYPE_INT_ARGB ||
            imageType == BufferedImage.TYPE_INT_RGB) {
            Raster raster = img.getRaster();
            return (int[]) raster.getDataElements(x, y, w, h, pixels);
        }

        // Unmanages the image
        return img.getRGB(x, y, w, h, pixels, 0, w);
    }

    /**
     * <p>Writes a rectangular area of pixels in the destination
     * <code>BufferedImage</code>. Calling this method on
     * an image of type different from <code>BufferedImage.TYPE_INT_ARGB</code>
     * and <code>BufferedImage.TYPE_INT_RGB</code> will unmanage the image.</p>
     *
     * @param img the destination image
     * @param x the x location at which to start storing pixels
     * @param y the y location at which to start storing pixels
     * @param w the width of the rectangle of pixels to store
     * @param h the height of the rectangle of pixels to store
     * @param pixels an array of pixels, stored as integers
     * @throws IllegalArgumentException is <code>pixels</code> is non-null and
     *   of length &lt; w*h
     */
    public static void setPixels(BufferedImage img,
                                 int x, int y, int w, int h, int[] pixels) {
        if (pixels == null || w == 0 || h == 0) {
            return;
        } else if (pixels.length < w * h) {
            throw new IllegalArgumentException("pixels array must have a length" +
                                               " >= w*h");
        }

        int imageType = img.getType();
        if (imageType == BufferedImage.TYPE_INT_ARGB ||
            imageType == BufferedImage.TYPE_INT_RGB) {
            WritableRaster raster = img.getRaster();
            raster.setDataElements(x, y, w, h, pixels);
        } else {
            // Unmanages the image
            img.setRGB(x, y, w, h, pixels, 0, w);
        }
    }
}
/*
 * Copyright (c) 2007, Romain Guy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of the TimingFramework project nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */



class GaussianBlurFilter extends AbstractFilter {
    private final int radius;

    /**
     * <p>Creates a new blur filter with a default radius of 3.</p>
     */
    public GaussianBlurFilter() {
        this(3);
    }

    /**
     * <p>Creates a new blur filter with the specified radius. If the radius
     * is lower than 0, a radius of 0.1 will be used automatically.</p>
     *
     * @param radius the radius, in pixels, of the blur
     */
    public GaussianBlurFilter(int radius) {
        if (radius < 1) {
            radius = 1;
        }

        this.radius = radius;
    }

    /**
     * <p>Returns the radius used by this filter, in pixels.</p>
     *
     * @return the radius of the blur
     */
    public int getRadius() {
        return radius;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public BufferedImage filter(BufferedImage src, BufferedImage dst) {
        int width = src.getWidth();
        int height = src.getHeight();

        if (dst == null) {
            dst = createCompatibleDestImage(src, null);
        }

        int[] srcPixels = new int[width * height];
        int[] dstPixels = new int[width * height];

        float[] kernel = createGaussianKernel(radius);

        GraphicsUtilities.getPixels(src, 0, 0, width, height, srcPixels);
        // horizontal pass
        blur(srcPixels, dstPixels, width, height, kernel, radius);
        // vertical pass
        //noinspection SuspiciousNameCombination
        blur(dstPixels, srcPixels, height, width, kernel, radius);
        // the result is now stored in srcPixels due to the 2nd pass
        GraphicsUtilities.setPixels(dst, 0, 0, width, height, srcPixels);

        return dst;
    }

    /**
     * <p>Blurs the source pixels into the destination pixels. The force of
     * the blur is specified by the radius which must be greater than 0.</p>
     * <p>The source and destination pixels arrays are expected to be in the
     * INT_ARGB format.</p>
     * <p>After this method is executed, dstPixels contains a transposed and
     * filtered copy of srcPixels.</p>
     *
     * @param srcPixels the source pixels
     * @param dstPixels the destination pixels
     * @param width the width of the source picture
     * @param height the height of the source picture
     * @param kernel the kernel of the blur effect
     * @param radius the radius of the blur effect
     */
    static void blur(int[] srcPixels, int[] dstPixels,
                     int width, int height,
                     float[] kernel, int radius) {
        float a;
        float r;
        float g;
        float b;

        int ca;
        int cr;
        int cg;
        int cb;

        for (int y = 0; y < height; y++) {
            int index = y;
            int offset = y * width;

            for (int x = 0; x < width; x++) {
                a = r = g = b = 0.0f;

                for (int i = -radius; i <= radius; i++) {
                    int subOffset = x + i;
                    if (subOffset < 0 || subOffset >= width) {
                        subOffset = (x + width) % width;
                    }

                    int pixel = srcPixels[offset + subOffset];
                    float blurFactor = kernel[radius + i];

                    a += blurFactor * ((pixel >> 24) & 0xFF);
                    r += blurFactor * ((pixel >> 16) & 0xFF);
                    g += blurFactor * ((pixel >>  8) & 0xFF);
                    b += blurFactor * ((pixel      ) & 0xFF);
                }

                ca = (int) (a + 0.5f);
                cr = (int) (r + 0.5f);
                cg = (int) (g + 0.5f);
                cb = (int) (b + 0.5f);

                dstPixels[index] = ((ca > 255 ? 255 : ca) << 24) |
                                   ((cr > 255 ? 255 : cr) << 16) |
                                   ((cg > 255 ? 255 : cg) <<  8) |
                                    (cb > 255 ? 255 : cb);
                index += height;
            }
        }
    }

    static float[] createGaussianKernel(int radius) {
        if (radius < 1) {
            throw new IllegalArgumentException("Radius must be >= 1");
        }

        float[] data = new float[radius * 2 + 1];

        float sigma = radius / 3.0f;
        float twoSigmaSquare = 2.0f * sigma * sigma;
        float sigmaRoot = (float) Math.sqrt(twoSigmaSquare * Math.PI);
        float total = 0.0f;

        for (int i = -radius; i <= radius; i++) {
            float distance = i * i;
            int index = i + radius;
            data[index] = (float) Math.exp(-distance / twoSigmaSquare) / sigmaRoot;
            total += data[index];
        }

        for (int i = 0; i < data.length; i++) {
            data[i] /= total;
        }

        return data;
    }
}
/*
 * Copyright (c) 2007, Romain Guy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of the TimingFramework project nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


/**
 * <p>Provides an abstract implementation of the <code>BufferedImageOp</code>
 * interface. This class can be used to created new image filters based
 * on <code>BufferedImageOp</code>.</p>
 *
 * @author Romain Guy <romain.guy@mac.com>
 */

abstract class AbstractFilter implements BufferedImageOp {
    public abstract BufferedImage filter(BufferedImage src, BufferedImage dest);

    /**
     * {@inheritDoc}
     */
    public Rectangle2D getBounds2D(BufferedImage src) {
        return new Rectangle(0, 0, src.getWidth(), src.getHeight());
    }

    /**
     * {@inheritDoc}
     */
    public BufferedImage createCompatibleDestImage(BufferedImage src,
                                                   ColorModel destCM) {
        if (destCM == null) {
            destCM = src.getColorModel();
        }

        return new BufferedImage(destCM,
                                 destCM.createCompatibleWritableRaster(
                                         src.getWidth(), src.getHeight()),
                                 destCM.isAlphaPremultiplied(), null);
    }

    /**
     * {@inheritDoc}
     */
    public Point2D getPoint2D(Point2D srcPt, Point2D dstPt) {
        return (Point2D) srcPt.clone();
    }

    /**
     * {@inheritDoc}
     */
    public RenderingHints getRenderingHints() {
        return null;
    }
}

 

   
    
  








Related examples in the same category

1.Create an image that does not support transparency
2.Create an image that supports transparent pixels
3.Create an image that supports arbitrary levels of transparency
4.Creating a buffered image using Component.createImage().
5.Creating a Buffered Image from an Image
6.Drawing on a Buffered Image
7.If the buffered image supports transparency
8.Converting a Buffered Image (BufferedImage) from an Image
9.Getting and Setting Pixels in a Buffered Image
10.Scaling a Buffered Image
11.Shearing a Buffered Image
12.Translating a Buffered Image
13.Rotating a Buffered Image
14.Flipping a Buffered Image
15.Flip the image horizontally
16.Flip the image vertically and horizontally, equivalent to rotating the image 180 degrees
17.2D Image Draw
18.Transform image
19.Creating a Image Zoomer using Graphics2D
20.Gaussian Blur DemoGaussian Blur Demo
21.Intermediate ImagesIntermediate Images
22.Image reflectionImage reflection
23.Bloom DemoBloom Demo
24.Box Blur DemoBox Blur Demo
25.Brightness Increase DemoBrightness Increase Demo
26.Blur an ImageBlur an Image
27.Blur our image: Blur means an unfocused image
28.A reflected image: effect makes an illusion as if the image was reflected in water
29.Enlarge Image With AnimationEnlarge Image With Animation
30.Image ZoomingImage Zooming
31.Simple image handling and drawing interactionSimple image handling and drawing interaction
32.Create a grayscale image with Java 2D tools
33.A 3x3 kernel that embosses an image.
34.A 3x3 kernel that blurs an image.
35.A 3x3 kernel that sharpens an image.
36.Embossing a Buffered Image
37.Brighten the image by 30%
38.Darken the image by 10%
39.Extend RGBImageFilter to create ColorFilter class
40.Extend RGBImageFilter to create AlphaFilter class
41.Enlarging an image by pixel replication
42.Shrinking an image by skipping pixels