实现水平方向重采样的java图像处理程序
该程序主要实现水平方向上的灰度图像重采样。重采样通过3个for循环控制完成。原始lena图如下所示：http://dl.iteye.com/upload/attachment/0076/1255/47050dcc-e581-31f1-8955-35c39524db0b.jpg
水平方向每8个点采集一个点的lena图像如下所示：
http://dl.iteye.com/upload/attachment/0076/1257/339f119c-c459-3137-84be-b2b284591a44.jpg
package p01;import java.awt.*;import java.awt.event.*;import java.awt.image.*;import java.io.File;import java.io.IOException;import javax.imageio.ImageIO;import javax.swing.*;public class chongcaiyang extends Frame{Image im, tmp;int iw, ih;int[] pixels;boolean flag_load = false;//构造方法public chongcaiyang(){super("chongcaiyang");Panel pdown; Button load, run, save, quit; addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e){ System.exit(0); } }); pdown = new Panel(); pdown.setBackground(Color.lightGray); //定义按钮 load = new Button("装载图像"); run = new Button("重采样"); save = new Button("保存"); quit = new Button("退出"); this.add(pdown, BorderLayout.SOUTH); //添加按钮 此处的顺序为案板上的左->右的顺序 pdown.add(load); pdown.add(run); pdown.add(save); pdown.add(quit); //按钮的动作程序装载图像 load.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ try {jLoad_ActionPerformed(e);} catch (IOException e1) {e1.printStackTrace();} } }); //按钮的动作程序重采样 run.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ try {jRun_ActionPerformed(e);} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();} } }); //按钮的动作程序 保存 save.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ try {jSave_ActionPerformed(e);} catch (IOException e1) {e1.printStackTrace();} } }); //按钮的动作程序退出 quit.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ jQuit_ActionPerformed(e); } });}//按钮动作的实现加载图像 public void jLoad_ActionPerformed(ActionEvent e) throws IOException{ File inputFile = new File("E:\\f2\\sc\\lena_grey.jpg"); BufferedImage input = ImageIO.read(inputFile);tmp = input; flag_load = true; repaint();}//按钮动作的实现重采样public void jRun_ActionPerformed(ActionEvent e) throws IOException{ if(flag_load){File inputFile = new File("E:\\f2\\sc\\lena_grey.jpg"); BufferedImage input = ImageIO.read(inputFile); iw = input.getWidth(this); ih = input.getHeight(this); //设定N值int N = iw;String s = JOptionPane.showInputDialog(null,"请输入N值(512/256/128/64/32/16/8)");if(s!= null&& !s.equals("")){N = Integer.parseInt(s);}//检查输入是否正确if((N>512)|(N<8)){N = 512;JOptionPane.showMessageDialog(null, "输入不正确，请重新输入！");} //图像重采样BufferedImage grayImage = new BufferedImage(iw, ih, BufferedImage.TYPE_BYTE_GRAY);//kao!三个循环就就能搞定，不就是重采样吗？for(int i=0; i<ih-1; i++){for(int j=0; j<iw-1; j=j+(ih/N)){for(int k=0; k<(ih/N); k++){int rgb = input.getRGB(i, j); int grey = (int) (0.3*((rgb&0xff0000)>>16)+0.59*((rgb&0xff00)>>8)+0.11*((rgb&0xff)));rgb = 255<<24|grey<<16|grey<<8|grey;grayImage.setRGB(i, j+k, rgb);}}} //产生图像tmp = grayImage;flag_load = true;repaint();}else{JOptionPane.showMessageDialog(null, "先点击“装载图像”，3Q！","提示：", JOptionPane.WARNING_MESSAGE);}}//按钮动作的实现保存 public void jSave_ActionPerformed(ActionEvent e) throws IOException{ if(flag_load){ BufferedImage bi = new BufferedImage(tmp.getWidth(null),tmp.getHeight(null), BufferedImage.TYPE_INT_RGB); Graphics g = bi.getGraphics(); g.drawImage(tmp,0, 0,null); g.dispose(); File save_path=new File("E:\\f2\\sc\\save_t01.jpg"); ImageIO.write(bi, "JPG", save_path);}else{JOptionPane.showMessageDialog(null, "先点击“装载图像”，3Q！","提示：",JOptionPane.WARNING_MESSAGE);}}//按钮动作的实现退出public void jQuit_ActionPerformed(ActionEvent e){System.exit(0);}//绘图函数public void paint(Graphics g){//if(flag_Load){g.drawImage(tmp,50,50,this);//}else{}}public static void main(String[] args) {chongcaiyang ti = new chongcaiyang();ti.setSize(1000,860);ti.setVisible(true);}}
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