?? huffmancode.java
字號:
//HuffmanCode.java
/*
程序說明:對圖像進行Huffman編碼
程序修改:
最后修改時間:2003-12
作者:haibin
*/
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
public class HuffmanCode extends Frame {
Image im,tmp;
int iw,ih;
boolean flag=false;
//構造方法
public HuffmanCode(){
this.setTitle("Huffman編碼");
Panel pdown;
Button load,run,quit;
//添加窗口監聽事件
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
pdown = new Panel();
pdown.setBackground(Color.lightGray);
load=new Button("裝載圖像");
run = new Button("編碼(Huffman)");
quit=new Button("退出");
this.add(pdown,BorderLayout.SOUTH);
pdown.add(load);
pdown.add(run);
pdown.add(quit);
load.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
jLoad_ActionPerformed(e);
}
});
run.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
jRun_ActionPerformed(e);
}
});
quit.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
jQuit_ActionPerformed(e);
}
});
}
public void jLoad_ActionPerformed(ActionEvent e){
//利用MediaTracker跟蹤圖像的加載
MediaTracker tracker = new MediaTracker(this);
im=Toolkit.getDefaultToolkit().getImage("Miss.jpg");
tracker.addImage(im,0);
//等待圖像的完全加載
try{
tracker.waitForID(0);
}catch(InterruptedException e2){ e2.printStackTrace();}
//獲取圖像的寬度iw和高度ih
iw=im.getWidth(this);
ih=im.getHeight(this);
pixels=new int[iw*ih];
try{
PixelGrabber pg=new PixelGrabber(im,0,0,iw,ih,pixels,0,iw);
pg.grabPixels();
}catch (InterruptedException e3) {
e3.printStackTrace();
}
//將數組中的象素產生一個圖像
ImageProducer ip=new MemoryImageSource(iw,ih,pixels,0,iw);
tmp=createImage(ip);
flag=true;
repaint();
}
public void jRun_ActionPerformed(ActionEvent e){
if(flag){
//保存圖像的灰度
int grey[]=new int [iw*ih];
//獲得圖像的灰度值
for(int i=0;i<iw*ih;i++)
{
grey[i]=pixels[i]&0xff;
}
//對圖像進行Huffman編碼
Huffman huffman=new Huffman(grey,iw,ih);
System.out.println("iw:"+iw+"ih:"+ih);
//h.test();
huffman.huff();
//圖像熵
float entropy;
//平均碼子長度
float avgCode;
//編碼效率
float efficiency;
//出現頻率
float freq[]=new float[256];
//Huffman編碼
String sCode[] =new String[256];
entropy=huffman.getEntropy();
avgCode=huffman.getAvgCode();
efficiency=huffman.getEfficiency();
//出現頻率
freq=huffman.getFreq();
//Huffman編碼
sCode=huffman.getCode();
//調用HuffmanShow.java進行顯示
HuffmanShow hs=new HuffmanShow(entropy,avgCode,efficiency);
hs.setData(freq,sCode);
hs.showTable();
hs.show();
repaint();
}else{
JOptionPane.showMessageDialog(null,"請先打開一幅圖片!",
"Alert",JOptionPane.WARNING_MESSAGE);
}
}
public void jQuit_ActionPerformed(ActionEvent e)
{
//System.exit(0);
JOptionPane op =new JOptionPane();
int exit=op.showConfirmDialog(this,"你要退出嗎? ? ?","退出",JOptionPane.YES_NO_OPTION);
if(exit==JOptionPane.YES_OPTION)
{
System.exit(0);
}else{ }
}
//調用paint()方法,顯示圖像信息。
public void paint(Graphics g){
if(flag){
g.drawImage(tmp,20,20,this);
}else { }
}
//定義main方法,設置窗口的大小,顯示窗口
public static void main(String[] args) {
HuffmanCode hc = new HuffmanCode();
hc.setSize(500,400);
hc.show();
}
}
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