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ImageOps.javaAPI DocExample9970Wed Aug 08 15:13:48 BST 2001demos.Images

ImageOps

public class ImageOps extends ControlsSurface implements ChangeListener
Images drawn using operators such as ConvolveOp LowPass & Sharpen, LookupOp and RescaleOp.

Fields Summary
protected JSlider
slider1
protected JSlider
slider2
private static String[]
imgName
private static BufferedImage[]
img
private static String[]
opsName
private static BufferedImageOp[]
biop
private static int
rescaleFactor
private static float
rescaleOffset
private static int
low
private static int
high
private int
opsIndex
private int
imgIndex
Constructors Summary
public ImageOps()

 
     
        thresholdOp(low, high);
        int i = 1;
        biop[i++] = new RescaleOp(1.0f, 0, null);
        byte invert[] = new byte[256];
        byte ordered[] = new byte[256];
        for (int j = 0; j < 256 ; j++) {
            invert[j] = (byte) (256-j);
            ordered[j] = (byte) j;
        }
        biop[i++] = new LookupOp(new ByteLookupTable(0,invert), null);
        byte[][] yellowInvert = new byte[][] { invert, invert, ordered };
        biop[i++] = new LookupOp(new ByteLookupTable(0,yellowInvert), null);
        int dim[][] = {{3,3}, {3,3}, {3,3}, {5,5}};
        float data[][] = { {0.1f, 0.1f, 0.1f,              // 3x3 blur
                            0.1f, 0.2f, 0.1f,
                            0.1f, 0.1f, 0.1f},
                           {-1.0f, -1.0f, -1.0f,           // 3x3 sharpen
                            -1.0f, 9.0f, -1.0f,
                            -1.0f, -1.0f, -1.0f},
                           { 0.f, -1.f,  0.f,                  // 3x3 edge
                            -1.f,  5.f, -1.f,
                             0.f, -1.f,  0.f},
                           {-1.0f, -1.0f, -1.0f, -1.0f, -1.0f,  // 5x5 edge
                            -1.0f, -1.0f, -1.0f, -1.0f, -1.0f,
                            -1.0f, -1.0f, 24.0f, -1.0f, -1.0f,
                            -1.0f, -1.0f, -1.0f, -1.0f, -1.0f,
                            -1.0f, -1.0f, -1.0f, -1.0f, -1.0f}};
        for (int j = 0; j < data.length; j++, i++) {
            biop[i] = new ConvolveOp(new Kernel(dim[j][0],dim[j][1],data[j]));
        }
    
        setBackground(Color.white);
        for (int i = 0; i < imgName.length; i++) {
            Image image = getImage(imgName[i]);
            int iw = image.getWidth(this);
            int ih = image.getHeight(this);
            img[i] = new BufferedImage(iw, ih, BufferedImage.TYPE_INT_RGB);
            img[i].createGraphics().drawImage(image,0,0,null);
        }
        slider1 = new JSlider(JSlider.VERTICAL, 0, 255, low);
        slider1.setPreferredSize(new Dimension(15, 100));
        slider1.addChangeListener(this);
        slider2 = new JSlider(JSlider.VERTICAL, 0, 255, high);
        slider2.setPreferredSize(new Dimension(15, 100));
        slider2.addChangeListener(this);
        setControls(new Component[]{new DemoControls(this),slider1,slider2});
        setConstraints(new String[] { 
            BorderLayout.NORTH, BorderLayout.WEST, BorderLayout.EAST });
Methods Summary
public static voidmain(java.lang.String[] s)

        createDemoFrame(new ImageOps());
public voidrender(int w, int h, java.awt.Graphics2D g2)

        int iw = img[imgIndex].getWidth(null);
        int ih = img[imgIndex].getHeight(null);
        BufferedImage bi = new BufferedImage(iw,ih,BufferedImage.TYPE_INT_RGB);
        biop[opsIndex].filter(img[imgIndex], bi);
        g2.drawImage(bi,0,0,w,h,null);
public voidstateChanged(javax.swing.event.ChangeEvent e)

        // when using these sliders use double buffering, which means
        // ignoring when DemoSurface.imageType = 'On Screen'
        if (getImageType() <= 1) {
            setImageType(2);
        }
        if (e.getSource().equals(slider1)) {
            if (opsIndex == 0) {
                thresholdOp(slider1.getValue(), high);
            } else {
                rescaleFactor = slider1.getValue();
                biop[1] = new RescaleOp((float)rescaleFactor/128.0f, rescaleOffset, null);
            }
        } else {
            if (opsIndex == 0) {
                thresholdOp(low, slider2.getValue());
            } else {
                rescaleOffset = (float) slider2.getValue();
                biop[1] = new RescaleOp((float)rescaleFactor/128.0f, rescaleOffset, null);
            }

        }
        repaint();
public static voidthresholdOp(int low, int high)

        byte threshold[] = new byte[256];
        for (int j = 0; j < 256 ; j++) {
            if (j > high) {
                threshold[j] = (byte) 255;
            } else if (j < low) {
                threshold[j] = (byte) 0;
            } else {
                threshold[j] = (byte) j;
            }
        }
        biop[0] = new LookupOp(new ByteLookupTable(0,threshold), null);