Swing 在java中绘制缓冲图像的直方图

我加载了缓冲图像，需要绘制直方图吗？请建议我下一步的计划 RGB直方图。如果可以用jai做，请建议我做的方法。我尝试了很多，也在谷歌上搜索了很多，但dint找到了任何正确的解决方案。 下面是我如何加载我的图像，请提供下一步

    BufferedImage   image= ImageIO.read(new File("C:\\Images\\Sunset.jpg"));             

    ParameterBlock pb = new ParameterBlock();

    int[] bins = { 256 };
    double[] low = { 0.0D };
    double[] high = { 256.0D };

    pb.addSource(image);
    pb.add(null);
    pb.add(1);
    pb.add(1);
    pb.add(bins);
    pb.add(low);
    pb.add(high);

    RenderedOp op = JAI.create("histogram", pb, null);
    Histogram histogram = (Histogram) op.getProperty("histogram");

---

这是一个非常基本的柱状图，老实说，我不知道它有多正确。。。但我希望它能对你有所帮助

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Histogram extends JPanel {
    private int SIZE = 256;
    // Red, Green, Blue   
    private int NUMBER_OF_COLOURS = 3;

    public final int RED = 0;
    public final int GREEN = 1;
    public final int BLUE = 2;

    private int[][] colourBins;
    private volatile boolean loaded = false;
    private int maxY;

    /**
     * 
     * @param Path
     *            of image to create Histogram of.
     */
    public Histogram() {
        colourBins = new int[NUMBER_OF_COLOURS][];

        for (int i = 0; i < NUMBER_OF_COLOURS; i++) {
            colourBins[i] = new int[SIZE];
        }

        loaded = false;
    }

    public void load(String path) throws IOException {
        BufferedImage bi = ImageIO.read(new File(path));

            // Reset all the bins
        for (int i = 0; i < NUMBER_OF_COLOURS; i++) {
           for (int j = 0; j < SIZE; j++) {
                colourBins[i][j] = 0;
           }
        }

        for (int x = 0; x < bi.getWidth(); x++) {
            for (int y = 0; y < bi.getHeight(); y++) {
                Color c = new Color(bi.getRGB(x, y));

                colourBins[RED][c.getRed()]++;
                colourBins[GREEN][c.getGreen()]++;
                colourBins[BLUE][c.getBlue()]++;
            }
        }

        maxY = 0;

        for (int i = 0; i < NUMBER_OF_COLOURS; i++) {
            for (int j = 0; j < SIZE; j++) {
                if (maxY < colourBins[i][j]) {
                    maxY = colourBins[i][j];
                }
            }
        }

        loaded = true;
    }

    @Override
    public void paint(Graphics g) {
        if (loaded) {
            Graphics2D g2 = (Graphics2D)g;

            g2.setColor(Color.white);
            g2.fillRect(0, 0, getWidth(), getHeight());

            g2.setStroke(new BasicStroke(2));

            int xInterval = (int) ((double)getWidth() / ((double)SIZE+1));

            g2.setColor(Color.black);


            for (int i = 0; i < NUMBER_OF_COLOURS; i++) {

                // Set the graph
                if (i == RED) {
                    g2.setColor(Color.red);
                } else if (i == GREEN) {
                    g2.setColor(Color.GREEN);
                } else if (i == BLUE) {
                    g2.setColor(Color.blue);
                }

                // draw the graph for the spesific colour.
                for (int j = 0; j < SIZE - 1 ; j++) {
                    int value = (int) (((double)colourBins[i][j] / (double)maxY) * getHeight());
                    int value2 = (int) (((double)colourBins[i][j+1] / (double)maxY) * getHeight());

                    g2.drawLine(j * xInterval, getHeight() - value, (j+1)*xInterval, getHeight() - value2);
                }
            }
        } else {
            super.paint(g);
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Debug Frame");
        frame.setSize(200, 200);
        frame.setLayout(new BorderLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Histogram his = new Histogram();

        try {
            his.load("c:/scratch/andriod.png");
        } catch (IOException e) {
            e.printStackTrace();
        }

        frame.add(his,BorderLayout.CENTER);
        frame.setVisible(true);
    }
}

import java.awt.BasicStroke；
导入java.awt.BorderLayout；
导入java.awt.Color；
导入java.awt.Graphics；
导入java.awt.Graphics2D；
导入java.awt.image.buffereImage；
导入java.io.File；
导入java.io.IOException；
导入javax.imageio.imageio；
导入javax.swing.JFrame；
导入javax.swing.JPanel；
公共类直方图扩展JPanel{
私有整数大小=256；
//红，绿，蓝
颜色的私有整数=3；
公共最终整数红色=0；
公共最终整数绿色=1；
公共最终int蓝色=2；
私人int[][]色箱；
private volatile boolean loaded=false；
私有int-maxY；
/**
* 
*@param路径
*创建图像的直方图。
*/
公共直方图（）{
colorbins=新整数[颜色的数量][]；
for（int i=0；i<颜色数；i++）{
colorbins[i]=新整数[SIZE]；
}
加载=错误；
}
公共无效加载（字符串路径）引发IOException{
BuffereImage bi=ImageIO.read（新文件（路径））；
//重置所有垃圾箱
for（int i=0；i<颜色数；i++）{
对于（int j=0；j

这是一个非常基本的柱状图，老实说，我不知道它有多正确。。。但我希望它能对你有所帮助

import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Histogram extends JPanel {
    private int SIZE = 256;
    // Red, Green, Blue   
    private int NUMBER_OF_COLOURS = 3;

    public final int RED = 0;
    public final int GREEN = 1;
    public final int BLUE = 2;

    private int[][] colourBins;
    private volatile boolean loaded = false;
    private int maxY;

    /**
     * 
     * @param Path
     *            of image to create Histogram of.
     */
    public Histogram() {
        colourBins = new int[NUMBER_OF_COLOURS][];

        for (int i = 0; i < NUMBER_OF_COLOURS; i++) {
            colourBins[i] = new int[SIZE];
        }

        loaded = false;
    }

    public void load(String path) throws IOException {
        BufferedImage bi = ImageIO.read(new File(path));

            // Reset all the bins
        for (int i = 0; i < NUMBER_OF_COLOURS; i++) {
           for (int j = 0; j < SIZE; j++) {
                colourBins[i][j] = 0;
           }
        }

        for (int x = 0; x < bi.getWidth(); x++) {
            for (int y = 0; y < bi.getHeight(); y++) {
                Color c = new Color(bi.getRGB(x, y));

                colourBins[RED][c.getRed()]++;
                colourBins[GREEN][c.getGreen()]++;
                colourBins[BLUE][c.getBlue()]++;
            }
        }

        maxY = 0;

        for (int i = 0; i < NUMBER_OF_COLOURS; i++) {
            for (int j = 0; j < SIZE; j++) {
                if (maxY < colourBins[i][j]) {
                    maxY = colourBins[i][j];
                }
            }
        }

        loaded = true;
    }

    @Override
    public void paint(Graphics g) {
        if (loaded) {
            Graphics2D g2 = (Graphics2D)g;

            g2.setColor(Color.white);
            g2.fillRect(0, 0, getWidth(), getHeight());

            g2.setStroke(new BasicStroke(2));

            int xInterval = (int) ((double)getWidth() / ((double)SIZE+1));

            g2.setColor(Color.black);


            for (int i = 0; i < NUMBER_OF_COLOURS; i++) {

                // Set the graph
                if (i == RED) {
                    g2.setColor(Color.red);
                } else if (i == GREEN) {
                    g2.setColor(Color.GREEN);
                } else if (i == BLUE) {
                    g2.setColor(Color.blue);
                }

                // draw the graph for the spesific colour.
                for (int j = 0; j < SIZE - 1 ; j++) {
                    int value = (int) (((double)colourBins[i][j] / (double)maxY) * getHeight());
                    int value2 = (int) (((double)colourBins[i][j+1] / (double)maxY) * getHeight());

                    g2.drawLine(j * xInterval, getHeight() - value, (j+1)*xInterval, getHeight() - value2);
                }
            }
        } else {
            super.paint(g);
        }
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("Debug Frame");
        frame.setSize(200, 200);
        frame.setLayout(new BorderLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Histogram his = new Histogram();

        try {
            his.load("c:/scratch/andriod.png");
        } catch (IOException e) {
            e.printStackTrace();
        }

        frame.add(his,BorderLayout.CENTER);
        frame.setVisible(true);
    }
}

import java.awt.BasicStroke；
导入java.awt.BorderLayout；
导入java.awt.Color；
导入java.awt.Graphics；
导入java.awt.Graphics2D；
导入java.awt.image.buffereImage；
导入java.io.File；
导入java.io.IOException；
导入javax.imageio.imageio；
导入javax.swing.JFrame；
导入javax.swing.JPanel；
公共类直方图扩展JPanel{
私有整数大小=256；
//红，绿，蓝
颜色的私有整数=3；
公共最终整数红色=0；
公共最终整数绿色=1；
公共最终int蓝色=2；
私人int[][]色箱；
private volatile boolean loaded=false；
私有int-maxY；
/**
* 
*@param路径
*创建图像的直方图。
*/
公共直方图（）{
colorbins=新整数[颜色的数量][]；
for（int i=0；i<颜色数；i++）{
colorbins[i]=新整数[SIZE]；
}
加载=错误；
}
公共无效加载（字符串路径）引发IOException{
BuffereImage bi=ImageIO.read（新文件（路径））；
//重置所有垃圾箱
for（int i=0；i<颜色数；i++）{
对于（int j=0；j