OpenCV和Java，图片形变：坐标系变换

ASR/CV/ML OpenCV和Java，图片形变：坐标系变换

linearPolar，线性极坐标映射，把数据从笛卡尔坐标系转到极坐标坐标系。见下图

logPolar，对数极坐标，是把数据从笛卡尔转到对数极坐标系。见下图

import java.awt.Color;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JRadioButton;
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.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

public class Polar extends JFrame {

    private final JLabel imageView;
    private Mat srcMat;
    private Point mousePoint;

    public Polar() {
        srcMat = Imgcodecs.imread("./linearPolar_test.jpg");

        JLabel linearPolarLabel = new JLabel("LinearPolar:" + 1);
        linearPolarLabel.setBounds(15, 15, 100, 15);

        JRadioButton linearPolar8Btn = new JRadioButton("8");
        linearPolar8Btn.setSelected(true);
        linearPolar8Btn.setBounds(280, 10, 50, 25);
        linearPolar8Btn.setForeground(Color.BLUE);

        JRadioButton linearPolar16Btn = new JRadioButton("16");
        linearPolar16Btn.setBounds(330, 10, 50, 25);
        linearPolar16Btn.setForeground(Color.BLUE);

        ButtonGroup group = new ButtonGroup();
        group.add(linearPolar8Btn);
        group.add(linearPolar16Btn);

        JSlider linearPolarBar = new JSlider(1, 360);
        linearPolarBar.setValue(1);
        linearPolarBar.setBounds(110, 10, 120, 25);
        linearPolarBar.addChangeListener(new ChangeListener() {
            @Override
            public void stateChanged(ChangeEvent e) {
                int value = linearPolarBar.getValue();
                linearPolarLabel.setText("LinearPolar:" + value);
                int type = linearPolar8Btn.isSelected() ? 8 : 16;
                linearPolarPic(mousePoint, value, type);
            }
        });

        imageView = new JLabel();
        imageView.setBounds(15, 40, 299, 302);
        imageView.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                mousePoint = new Point(e.getX(), e.getY());
                int maxRadius = linearPolarBar.getValue();
                int type = linearPolar8Btn.isSelected() ? 8 : 16;
                linearPolarPic(mousePoint, maxRadius, type);
            }
        });

        this.setTitle("OpenCV和Java，图片形变");
        this.setSize(550, 580);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.getContentPane().setLayout(null);
        this.getContentPane().add(linearPolarLabel);
        this.getContentPane().add(linearPolarBar);
        this.getContentPane().add(linearPolar8Btn);
        this.getContentPane().add(linearPolar16Btn);
        this.getContentPane().add(imageView);

        setIcon(srcMat);
    }

    private void linearPolarPic(Point point, int maxRadius, int flags) {
        double x, y;
        if (null == point) {
            x = srcMat.cols() / 2d;
            y = srcMat.rows() / 2d;
        } else {
            x = point.x;
            y = point.y;
        }
        Point center = new Point(x, y);
        Mat dstMat = new Mat();
        
        // flags = Imgproc.CV_WARP_FILL_OUTLIERS = 8; 填充输出图像所有像素，如果这些点有和外点对应的，则置零。
        // flags = Imgproc.CV_WARP_INVERSE_MAP = 16;  表示矩阵由输出图像到输入图像的逆变换，并且因此可以直接用于像素插值。否则，函数从map_matrix中寻找逆变换。
        // flags = 8、9、10、16、17、18、28
        if (1 == 0) {
            // Imgproc.linearPolar(srcMat, dstMat, center, value, flags); // Deprecated
            Imgproc.warpPolar(srcMat, dstMat, srcMat.size(), center, maxRadius, flags); // 本例 maxRadius取0-360
        } else {
            Imgproc.logPolar(srcMat, dstMat, center, maxRadius, flags);  // Deprecated
            //Imgproc.warpPolar(srcMat, dstMat, srcMat.size(), center, maxRadius, flags + Imgproc.WARP_POLAR_LOG); ? 没效果
        }
        setIcon(dstMat);
    }

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

100

101

102

103

104

105

106

107

108

109

110

import java.awt.Color;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.image.BufferedImage;

import javax.swing.ButtonGroup;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JRadioButton;

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.imgcodecs.Imgcodecs;

import org.opencv.imgproc.Imgproc;

public class Polar extends JFrame {

private final JLabel imageView;

private Mat srcMat;

private Point mousePoint;

public Polar() {

srcMat = Imgcodecs.imread("./linearPolar_test.jpg");

JLabel linearPolarLabel = new JLabel("LinearPolar:" + 1);

linearPolarLabel.setBounds(15, 15, 100, 15);

JRadioButton linearPolar8Btn = new JRadioButton("8");

linearPolar8Btn.setSelected(true);

linearPolar8Btn.setBounds(280, 10, 50, 25);

linearPolar8Btn.setForeground(Color.BLUE);

JRadioButton linearPolar16Btn = new JRadioButton("16");

linearPolar16Btn.setBounds(330, 10, 50, 25);

linearPolar16Btn.setForeground(Color.BLUE);

ButtonGroup group = new ButtonGroup();

group.add(linearPolar8Btn);

group.add(linearPolar16Btn);

JSlider linearPolarBar = new JSlider(1, 360);

linearPolarBar.setValue(1);

linearPolarBar.setBounds(110, 10, 120, 25);

linearPolarBar.addChangeListener(new ChangeListener() {

@Override

public void stateChanged(ChangeEvent e) {

int value = linearPolarBar.getValue();

linearPolarLabel.setText("LinearPolar:" + value);

int type = linearPolar8Btn.isSelected() ? 8 : 16;

linearPolarPic(mousePoint, value, type);

}

});

imageView = new JLabel();

imageView.setBounds(15, 40, 299, 302);

imageView.addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(MouseEvent e) {

mousePoint = new Point(e.getX(), e.getY());

int maxRadius = linearPolarBar.getValue();

int type = linearPolar8Btn.isSelected() ? 8 : 16;

linearPolarPic(mousePoint, maxRadius, type);

}

});

this.setTitle("OpenCV和Java，图片形变");

this.setSize(550, 580);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.getContentPane().setLayout(null);

this.getContentPane().add(linearPolarLabel);

this.getContentPane().add(linearPolarBar);

this.getContentPane().add(linearPolar8Btn);

this.getContentPane().add(linearPolar16Btn);

this.getContentPane().add(imageView);

setIcon(srcMat);

}

private void linearPolarPic(Point point, int maxRadius, int flags) {

double x, y;

if (null == point) {

x = srcMat.cols() / 2d;

y = srcMat.rows() / 2d;

} else {

x = point.x;

y = point.y;

}

Point center = new Point(x, y);

Mat dstMat = new Mat();

// flags = Imgproc.CV_WARP_FILL_OUTLIERS = 8; 填充输出图像所有像素，如果这些点有和外点对应的，则置零。

// flags = Imgproc.CV_WARP_INVERSE_MAP = 16; 表示矩阵由输出图像到输入图像的逆变换，并且因此可以直接用于像素插值。否则，函数从map_matrix中寻找逆变换。

// flags = 8、9、10、16、17、18、28

if (1 == 0) {

// Imgproc.linearPolar(srcMat, dstMat, center, value, flags); // Deprecated

Imgproc.warpPolar(srcMat, dstMat, srcMat.size(), center, maxRadius, flags); // 本例 maxRadius取0-360

} else {

Imgproc.logPolar(srcMat, dstMat, center, maxRadius, flags); // Deprecated

//Imgproc.warpPolar(srcMat, dstMat, srcMat.size(), center, maxRadius, flags + Imgproc.WARP_POLAR_LOG); ? 没效果

}

setIcon(dstMat);

}

private void setIcon(Mat mat) {

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

imageView.setIcon(new ImageIcon(image));

}

- end

声明

本文由 cuiweiyou 原创，转载请注明出处：http://www.gaohaiyan.com/3488.html

承接App定制、企业web站点、办公系统软件设计开发，外包项目，毕设

opencv

OpenCV和Java，照手电筒效果、凸透镜、凹透镜
OpenCV和Java，模糊、油画
OpenCV和Java，区域填充
OpenCV和Java，图片滤镜、平滑、浮雕、边缘检测