学步园

package image;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

public class ImageDemo {

    public void binaryImage() throws IOException{
	File file = new File(System.getProperty("user.dir")+"/src/2722425974762424026.jpg");
	BufferedImage image = ImageIO.read(file);
	
	int width = image.getWidth();
	int height = image.getHeight();
	
	BufferedImage grayImage = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_BINARY);
	for(int i= 0 ; i < width ; i++){
	    for(int j = 0 ; j < height; j++){
		int rgb = image.getRGB(i, j);
		grayImage.setRGB(i, j, rgb);
	    }
	}
	
	File newFile = new File(System.getProperty("user.dir")+"/src/2722425974762424028.jpg");
	ImageIO.write(grayImage, "jpg", newFile);
    }
    
    public void grayImage() throws IOException{
	File file = new File(System.getProperty("user.dir")+"/src/2722425974762424026.jpg");
	BufferedImage image = ImageIO.read(file);
	
	int width = image.getWidth();
	int height = image.getHeight();
	
	BufferedImage grayImage = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);
	for(int i= 0 ; i < width ; i++){
	    for(int j = 0 ; j < height; j++){
		int rgb = image.getRGB(i, j);
		grayImage.setRGB(i, j, rgb);
	    }
	}
	
	File newFile = new File(System.getProperty("user.dir")+"/src/2722425974762424027.jpg");
	ImageIO.write(grayImage, "jpg", newFile);
    }
    
    public static void main(String[] args) throws IOException {
	ImageDemo demo = new ImageDemo();
	demo.binaryImage();
	demo.grayImage();
    }

}

主要就是BufferedImage.TYPE.BYTE.GRAY灰度化，BufferedImage.TYPE.BYTE.BINARY二值化

原图：

灰度化后的图片：

二值化后的图片：

效果还可以，赞一个JAVA。