如何使用RGB像素值绘制直方图？

我在netbeans平台上制作应用程序。 我想绘制图像。 我有红色，绿色和蓝色的图像像素。 所以，请任何一个suugest给我，我怎么能用这个像素值绘制直方图？ 我的代码在下面，其中我采用图像的RED，GREEN和BLUE像素值。

enter code here import java.awt.Component; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; public class WalkImageTest10 extends Component { public static void main(String[] foo) throws IOException { WalkImageTest10 wa= new WalkImageTest10(); } public void printPixelARGB(int pixel) { int alpha = (pixel >> 24) & 0xff; int red = (pixel >> 16) & 0xff; int green = (pixel >> 8) & 0xff; int blue = (pixel) & 0xff; System.out.println("argb: " + alpha + ", " + red + ", " + green + ", " + blue); //System.out.println(pixel); } private void marchThroughImage(BufferedImage image) { int w = image.getWidth(); int h = image.getHeight(); int pixel; System.out.println("width, height: " + w + ", " + h); for (int i = 0; i < h; i++) { for (int j = 0; j < w; j++) { //System.out.println("x,y: " + j + ", " + i); pixel = image.getRGB(j, i); printPixelARGB(pixel); //System.out.println("value of K:"+k+ " value of pixel: " + pixel[j][i]); } } System.out.println("loop is completed"); } public WalkImageTest10() throws IOException { // this is an image of a white spot on a black background. // with the smoothing in the image it's of course not all black // and white BufferedImage image = ImageIO.read(new File("F:\\java\\aimages\\003.jpg")); marchThroughImage(image); } } 

Answer 1

 import java.awt.Color; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.awt.image.RescaleOp; import java.io.IOException; import javax.media.jai.JAI; import javax.media.jai.PlanarImage; import javax.swing.*; public class FinalHistogram extends JPanel { int[] bins = new int[256]; FinalHistogram(int[] pbins) { bins = pbins; repaint(); } @Override protected void paintComponent(Graphics g) { //g.drawLine(); for (int i = 0; i < 256; i++) { System.out.println("bin[" + i + "]===" + bins[i]); g.drawLine(200 + i, 300, 200 + i, 300 - (bins[i])/1000); //g.drawLine(200 + i, 200, 200 + i, 200-(bins[i])/1500); // System.out.println("bin["+i+"]==="+bins[i]); } } public static void main(String[] args) throws IOException { JFrame frame = new JFrame(); frame.setSize(500, 500); int[] pbins = new int[256]; int[] sbins = new int[256]; PlanarImage image = JAI.create("fileload", "image12.tiff"); BufferedImage bi = image.getAsBufferedImage(); System.out.println("tipe is " + bi.getType()); int[] pixel = new int[3]; int k = 0; Color c = new Color(k); Double d = 0.0; Double d1; for (int x = 0; x < bi.getWidth(); x++) { for (int y = 0; y < bi.getHeight(); y++) { pixel = bi.getRaster().getPixel(x, y, new int[3]); d=(0.2125*pixel[0])+(0.7154*pixel[1])+(0.072*pixel[2]); k=(int) (d/256); sbins[k]++; } } System.out.println("copleted" + d + "--" + k); JTabbedPane jtp=new JTabbedPane(); ImageIcon im= new ImageIcon(bi); //jtp.add("New image", new JLabel((im))); jtp.addTab("Histogram",new FinalHistogram(sbins)); frame.add(jtp); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); } }