java图像处理---特殊颜色二值化处理

特殊颜色二值化处理（此处以RGB为例）

(1)输入一张图片（jpg已经测试）
(2)创建一个图片的缓存区   grayImage
(3)对输入图片各个像素进行处理，
逻辑：
当red > testnum || green > testnum || blue > testnum
red + green < testnum*1.5  &&   red + blue < testnum*1.5
&& green + blue < testnum*1.5  &&   red + green + blue < testnum*1.5
改变此逻辑即可实现对特殊 RGB 的二值化处理
(4)输出图片

输入：
RGB 彩色图片
输出：
特殊色彩区域为白色，其他区域为黑色

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

import javax.imageio.ImageIO;

/*
* 灰度化处理函数，，特殊的灰度化处理，，使用了加权平均数方法，使得处理后的图像更加真实清晰
*/
public class specialColor {
private static int colorToRGB(int alpha, int red, int green, int blue) {

int testnum = 0xbb;
if (red > testnum || green > testnum || blue > testnum)
if(red + green < testnum*1.5
&& red + blue < testnum*1.5
&& green + blue < testnum*1.5
&& red + green + blue < testnum*1.5)

return 0xffffffff;
else return 0xff000000;
else return 0xff000000;

//  return 0xff000000;  //黑色
//else return 0xffffffff;   //白色

}
public void processPicture(Graphics graphics) throws IOException {
BufferedImage bufferedImage
= ImageIO.read(new File("specialColor.jpg"));
BufferedImage grayImage =
new BufferedImage(bufferedImage.getWidth(),
bufferedImage.getHeight(),
bufferedImage.getType());

for (int i = 0; i < bufferedImage.getWidth(); i++) {
for (int j = 0; j < bufferedImage.getHeight(); j++) {
final int color = bufferedImage.getRGB(i, j);
final int r = (color >> 16) & 0xff;
final int g = (color >> 8) & 0xff;
final int b = color & 0xff;
int newPixel = colorToRGB(255, r, g, b);
grayImage.setRGB(i, j, newPixel);

//System.out.print(r+" "+g+" "+b);return;
}
}
graphics.drawImage(bufferedImage, 0, 0, 380, 400,null);
graphics.drawImage(grayImage,400,0, 380,400,null);
}
}

public static void main(String args[]){

//创建窗口
JFrame mFrame = new JFrame();
mFrame.setSize(800, 500);
mFrame.setVisible(true);
mFrame.add(new gray());
}

//重写paint 方法 画图
public void paint(Graphics g){

try {
new specialColor().processPicture(g);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}