OpenCV和Java，像素画

ASR/CV/ML OpenCV和Java，像素画

遍历图片的像素，每n个像素范围画一个马赛克：圆形或矩形。
马赛克使用原像素的颜色值，也可以调亮或调暗。

import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Scalar;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

public class PixelPic extends JFrame {

    private JLabel imageView;
    private Mat srcMat;

    public PixelPic() {
        JCheckBox pixelBtn = new JCheckBox("像素画");
        pixelBtn.setBounds(10, 10, 90, 25);

        JSlider stepBar = new JSlider(1, 20);
        stepBar.setValue(5);
        stepBar.setBounds(110, 10, 150, 25);

        pixelBtn.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent e) {
                pixelPic(pixelBtn.isSelected(), stepBar.getValue());
            }
        });

        stepBar.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent e) {
                pixelPic(pixelBtn.isSelected(), stepBar.getValue());
            }
        });

        imageView = new JLabel("");
        imageView.setBounds(0, 40, 512, 512);

        this.setTitle("像素画");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(550, 600);
        this.getContentPane().setLayout(null);
        this.getContentPane().add(pixelBtn);
        this.getContentPane().add(stepBar);
        this.getContentPane().add(imageView);

        srcMat = Imgcodecs.imread("./lena.jpg"); //, Imgcodecs.CV_LOAD_IMAGE_COLOR);
        setIcon(srcMat);
    }

    // 黑天照手电筒效果 
    private void pixelPic(boolean isPixel, int _step) {
        if (!isPixel) {
            setIcon(srcMat);
            return;
        }

        int step = _step;
        int radius = step / 2 + 1;
        int thickness = -1;
        Mat dstMat = new Mat(srcMat.rows(), srcMat.cols(), srcMat.type());
        for (int y = 0; y < srcMat.rows(); y += step) {     // 行，对应y轴
            for (int x = 0; x < srcMat.cols(); x += step) { // 列，对应x轴
                Point center = new Point(x, y);    // 像素位置
                double[] pixel = srcMat.get(y, x); // 像素，bgr
                double b = pixel[0];
                double g = pixel[1];
                double a = pixel[2];
                drawCircle(dstMat, center, radius, b, g, a, thickness);
            }
        }
        setIcon(dstMat);
    }

    private void drawCircle(Mat canvas, Point center, int radius, double b, double g, double r, int thickness) {
        // 画圆
        Imgproc.circle(canvas,       // 画布
                center,              // 圆心
                radius,              // 半径
                new Scalar(b, g, r), // 颜色
                thickness);          // 边框粗细。-1为填充
    }

    private void setIcon(Mat mat) {
        BufferedImage image = CVUtil.matToBufferedImage(mat); // CVUtil 见 http://www.gaohaiyan.com/3229.html
        imageView.setIcon(new ImageIcon(image));
    }
}

import java.awt.image.BufferedImage;

import javax.swing.ImageIcon;

import javax.swing.JCheckBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JSlider;

import javax.swing.event.ChangeEvent;

import javax.swing.event.ChangeListener;

import org.opencv.core.Mat;

import org.opencv.core.Point;

import org.opencv.core.Scalar;

import org.opencv.imgcodecs.Imgcodecs;

import org.opencv.imgproc.Imgproc;

public class PixelPic extends JFrame {

private JLabel imageView;

private Mat srcMat;

public PixelPic() {

JCheckBox pixelBtn = new JCheckBox("像素画");

pixelBtn.setBounds(10, 10, 90, 25);

JSlider stepBar = new JSlider(1, 20);

stepBar.setValue(5);

stepBar.setBounds(110, 10, 150, 25);

pixelBtn.addChangeListener(new ChangeListener() {

@Override

public void stateChanged(ChangeEvent e) {

pixelPic(pixelBtn.isSelected(), stepBar.getValue());

}

});

stepBar.addChangeListener(new ChangeListener() {

@Override

public void stateChanged(ChangeEvent e) {

pixelPic(pixelBtn.isSelected(), stepBar.getValue());

}

});

imageView = new JLabel("");

imageView.setBounds(0, 40, 512, 512);

this.setTitle("像素画");

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setSize(550, 600);

this.getContentPane().setLayout(null);

this.getContentPane().add(pixelBtn);

this.getContentPane().add(stepBar);

this.getContentPane().add(imageView);

srcMat = Imgcodecs.imread("./lena.jpg"); //, Imgcodecs.CV_LOAD_IMAGE_COLOR);

setIcon(srcMat);

}

// 黑天照手电筒效果

private void pixelPic(boolean isPixel, int _step) {

if (!isPixel) {

setIcon(srcMat);

return;

}

int step = _step;

int radius = step / 2 + 1;

int thickness = -1;

Mat dstMat = new Mat(srcMat.rows(), srcMat.cols(), srcMat.type());

for (int y = 0; y < srcMat.rows(); y += step) { // 行，对应y轴

for (int x = 0; x < srcMat.cols(); x += step) { // 列，对应x轴

Point center = new Point(x, y); // 像素位置

double[] pixel = srcMat.get(y, x); // 像素，bgr

double b = pixel[0];

double g = pixel[1];

double a = pixel[2];

drawCircle(dstMat, center, radius, b, g, a, thickness);

}

setIcon(dstMat);

}

private void drawCircle(Mat canvas, Point center, int radius, double b, double g, double r, int thickness) {

// 画圆

Imgproc.circle(canvas, // 画布

center, // 圆心

radius, // 半径

new Scalar(b, g, r), // 颜色

thickness); // 边框粗细。-1为填充

}

private void setIcon(Mat mat) {

BufferedImage image = CVUtil.matToBufferedImage(mat); // CVUtil 见 http://www.gaohaiyan.com/3229.html

imageView.setIcon(new ImageIcon(image));

}

- end

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