Histogram Code In Java
Histograb.java file
import java.applet.Applet;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.image.PixelGrabber;
@SuppressWarnings("serial")
public class HistoGrab extends Applet {
Dimension d;
Image img;
int iw,ih;
int pixels[];
int w,h;
int hist[]=new int[256];
int max_hist=0;
public void init()
{
d=getSize();
w=d.width;
h=d.height;
img=getImage(getDocumentBase(),getParameter("img"));
MediaTracker t=new MediaTracker(this);
t.addImage(img,0);
try {
t.waitForID(0);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
iw=img.getWidth(null);
ih=img.getHeight(null);
pixels=new int[iw*ih];
PixelGrabber pg=new PixelGrabber(img,0,0,iw,ih,pixels,0,iw);
try {
pg.grabPixels();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for(int i=0;i<iw*ih;i++)
{
int p=pixels[i];
int r=0xff &(p>>16);
int g=0xff &(p>>8);
int b=0xff &(p);
int y=(int)(.33*r+.56*g+.11*b);
hist[y]++;
}
for(int i=0;i<256;i++)
{
if(hist[i]>max_hist)
max_hist=hist[i];
}
}
public void update(){}
public void paint(Graphics g)
{
g.drawImage(img,0,0,null);
System.out.println(w);
int x=(w-256)/2;
int lasty=h-h*hist[0]/max_hist;
for(int i=0;i<256;i++,x++)
{
int y=h-h*hist[i]/max_hist;
g.setColor(new Color(i,i,i));
g.fillRect(x, y, 1, h);
g.setColor(Color.red);
g.drawLine(x-1,lasty,x,y);
lasty=y;
}
}
}
The html file
<html>
<head></head>
<body>
<applet code=HistoGrab.class width=314 height=400>
<param name=img value=green.jpg>
</applet>
</body>
</html>
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