（JAVA）获取图片轮廓

File filepath = new File("e://shang.jpg");   //image file path
BufferedImage image = ImageIO.read(filepath);    //image's read_buffer
int type= image.getType();    //image's type  TYPE_3BYTE_BGR = 5

image.getRGB(x, y)//point (x,y) pixel

BufferedImage outImg = null;
outImg = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_ARGB);
//TYPE_INT_ARGB是color model

outImg.setRGB(x, y, rgb);

File outFile = new File("e://generate.png");
try {
ImageIO.write(outImg, "png", outFile);
} catch (IOException e) {
e.printStackTrace();
}

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.awt.Rectangle;
import java.awt.image.Raster;
import javax.imageio.ImageIO;

public class getImg {

/**
* @param args
* @throws IOException
*/

public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
File filepath = new File("e://shang.jpg");   //image file path
BufferedImage image = ImageIO.read(filepath);    //image's read_buffer
int type= image.getType();    //image's type  TYPE_3BYTE_BGR = 5
Raster ra = image.getData();
Rectangle rect = ra.getBounds();

int nImageDate[] = new int[rect.height*rect.width];
int nTemp[] = new int[rect.width*rect.height];
//nImageDate = ra.getPixels(0,0,rect.width, rect.height,nTemp);
//nImageDate = image.getRGB(0, 0, image.getWidth(), image.getHeight(), nTemp, 0, 0);
System.out.println( "type: "+type );
System.out.println( "image.width: "+ image.getWidth() );
System.out.println( "image.height: "+ image.getHeight() );

BufferedImage outImg = null;
outImg = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_ARGB);
int x,y;
int rgb;
for( y=0;y<259;y++)  //按行扫描
{
for( x=0;x<282;x++)
{
if( x==0 || y==0 || x==281 || y==258 ) continue;
rgb = image.getRGB(x, y);
if( image.getRGB(x, y)!=-1 && (image.getRGB(x-1, y)==-1||image.getRGB(x+1, y)==-1) ){ //判断该点是不是轮廓点
outImg.setRGB(x, y, rgb);
System.out.println(rgb);
}
}
}

for( x=0;x<282;x++) //按列扫描
{
for( y=0;y<259;y++)
{
if( x==0 || y==0 || x==281 || y==258 ) continue;
rgb = image.getRGB(x, y);
if( image.getRGB(x, y)!=-1 && (image.getRGB(x, y+1)==-1||image.getRGB(x, y-1)==-1) ){ //判断该点是不是轮廓点
outImg.setRGB(x, y, rgb);
}
}
}

//outImg.setRGB( 0, 0, image.getWidth(), image.getHeight(), nTemp, 0 , image.getWidth() );
File outFile = new File("e://generate.png");
try {
ImageIO.write(outImg, "png", outFile);
} catch (IOException e) {
e.printStackTrace();
}

}

}