Java做球體邊緣提取，並找到球心

上課老師留的作業，由於現在學java了，就沒用Opencv做，自己用java根據像素做差

提取圖片內球體輪廓，並找出求新標記。直接上代碼，可以直接用，需要自取。

沒用二值化做邊緣提取，因爲老師要求及效果圖是我發那種。

結果如圖：

package Image;

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

import javax.imageio.ImageIO;

public class TiQuPaiqiu {
	public static void main(String[] args) {
		try {
			File src = new File("E:\\workplace\\SmallProject\\src\\Image\\測試.jpg");
			File gray = new File("E:\\workplace\\SmallProject\\src\\Image\\灰度.jpg");
			File dst = new File("E:\\workplace\\SmallProject\\src\\Image\\結果.jpg");
            ImageIO.write(grayImage(src), "jpg", gray);
            ImageIO.write(subImage(gray), "jpg", dst);
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
	}
	//圖像灰度處理
	 public static BufferedImage grayImage(File src) {
	        BufferedImage srcImage = null;
	        try {
	            srcImage = ImageIO.read(src);
		        int width = srcImage.getWidth();
		        int height = srcImage.getHeight();
		
		        for (int j = 0; j < height; j++) {
		            for (int i = 0; i < width; i++) {
		                int p = srcImage.getRGB(i, j);
		
		                int a = (p >> 24) & 0xff;
		                int r = (p >> 16) & 0xff;
		                int g = (p >> 8) & 0xff;
		                int b = p & 0xff;
		
		                int avg = (r + g + b) / 3;
		                p = (a << 24) | (avg << 16) | (avg << 8) | avg;
		                
		                srcImage.setRGB(i, j, p);
		            }
	        }
	    } catch (IOException e) {
	        System.out.println(e);
	    }
	        return srcImage;
	}
	 //像素做差判斷是否爲目標物體，並用黑色正方形標記
	 public static BufferedImage subImage(File src) {
	        BufferedImage srcImage = null;
	        int p_x = 0,p_y = 0;
		    int center_x = 0, center_y = 0;
		    int count = 0;
	        try {
	            srcImage = ImageIO.read(src);
		        int width = srcImage.getWidth();
		        int height = srcImage.getHeight();
		
		        for (int j = 0; j < height; j++) {
		            for (int i = 0; i < width; i++) {
		                int p = srcImage.getRGB(i, j);
		
		                int a = (p >> 24) & 0xff;
		                int r = (p >> 16) & 0xff;
		                int g = (p >> 8) & 0xff;
		                int b = p & 0xff;
		
		                int avg = (r + g + b) / 3;
		                avg = 255 - (avg-190);
		                if(avg <= 245) {
							count ++;
							p_x = p_x + i;
							p_y = p_y + j; 
						}
		                else {
		                	avg = 255;
						}
		                p = (a << 24) | (avg << 16) | (avg << 8) | avg;
		                srcImage.setRGB(i, j, p);

		            }
	        }
		        //對圓心用黑色正方形標記
		        center_x = p_x / count;
				center_y = p_y / count;
				for(int k = center_x -5;k<center_x+5;k++) {
					for(int t = center_y-5;t<center_y+5;t++) {
						int pb = srcImage.getRGB(k, t); 
						int ab = (pb >> 24) & 0xff;
						int v = 0;
						pb = (ab << 24) | (v << 16) | (v << 8) | v;
						srcImage.setRGB(k, t,pb); 
					}
				}
	    } catch (IOException e) {
	        System.out.println(e);
	    }
	        return srcImage;
	}
}