通过Mat操作每个像素，改变bgr三色的值大小。
以及"改变像素的位置"，扩张和挤压。
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import java.awt.event.ItemEvent; import java.awt.event.ItemListener; 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.imgcodecs.Imgcodecs; public class SpotExpandExtrude extends JFrame { private JLabel imageView; private Mat srcMat; private int type = 1; private int mouseX; private int mouseY; private int radius = 30; private int divisor = 10; public SpotExpandExtrude() { JRadioButton spotBtn = new JRadioButton("手电筒"); spotBtn.setSelected(true); spotBtn.setBounds(15, 5, 80, 25); spotBtn.addItemListener(new ItemListener() { @Override public void itemStateChanged(ItemEvent e) { type = 1; spotPic(); } }); JRadioButton expandBtn = new JRadioButton("凸透镜"); expandBtn.setBounds(125, 5, 80, 25); expandBtn.addItemListener(new ItemListener() { @Override public void itemStateChanged(ItemEvent e) { type = 2; expandPic(); } }); JRadioButton extrudeBtn = new JRadioButton("凹透镜"); extrudeBtn.setBounds(235, 5, 80, 25); ButtonGroup group = new ButtonGroup(); group.add(spotBtn); group.add(expandBtn); group.add(extrudeBtn); JLabel radiusLabel = new JLabel("半径:" + radius); radiusLabel.setBounds(340, 10, 80, 15); JSlider valueBar = new JSlider(10, 400); valueBar.setValue(radius); valueBar.setBounds(400, 5, 150, 25); valueBar.addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) { radius = valueBar.getValue(); radiusLabel.setText("半径:" + radius); if (1 == type) { // 手电筒 spotPic(); } else if (2 == type) { // 凸透镜 expandPic(); } else { // 凹透镜 extrudePic(); } } }); JLabel divisorLabel = new JLabel("凹镜因子:" + divisor); divisorLabel.setBounds(340, 35, 90, 15); JSlider divisorBar = new JSlider(10, 50); divisorBar.setValue(divisor); divisorBar.setBounds(410, 30, 140, 25); divisorBar.addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) { divisor = divisorBar.getValue(); divisorLabel.setText("凹镜因子:" + divisor); if (1 == type) { // 手电筒 spotPic(); } else if (2 == type) { // 凸透镜 expandPic(); } else { // 凹透镜 extrudePic(); } } }); extrudeBtn.addItemListener(new ItemListener() { @Override public void itemStateChanged(ItemEvent e) { type = 3; radius = 220; // 针对本图片合适的一组数字 divisor = 15; // 针对本图片合适的一组数字 valueBar.setValue(radius); divisorBar.setValue(divisor); extrudePic(); } }); mouseX = 512 / 2; mouseY = 512 / 2; imageView = new JLabel(""); imageView.setBounds(0, 60, 512, 512); imageView.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { mouseX = e.getX(); mouseY = e.getY(); if (1 == type) { // 手电筒 spotPic(); } else if (2 == type) { // 凸透镜 expandPic(); } else { // 凹透镜 extrudePic(); } } }); this.setTitle("手电筒、凸透镜、凹透镜"); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setSize(550, 600); this.getContentPane().setLayout(null); this.getContentPane().add(spotBtn); this.getContentPane().add(expandBtn); this.getContentPane().add(radiusLabel); this.getContentPane().add(valueBar); this.getContentPane().add(extrudeBtn); this.getContentPane().add(divisorLabel); this.getContentPane().add(divisorBar); 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 spotPic() { Mat dstMat = new Mat(srcMat.rows(), srcMat.cols(), srcMat.type()); for (int y = 0; y < srcMat.rows(); y++) { // 行，对应y轴 for (int x = 0; x < srcMat.cols(); x++) { // 列，对应x轴 double dx = Math.abs(x - mouseX); double dy = Math.abs(y - mouseY); double distance = Math.sqrt(dx * dx + dy * dy); // 像素距离鼠标点击位置的距离 double weight = Math.exp(distance / radius * -1d); // 归一化。距离越近的越趋向于1。 double[] pixel = srcMat.get(y, x); pixel[0] = Math.round(pixel[0] * weight); // weight越趋向1，越接近原色彩 pixel[1] = Math.round(pixel[1] * weight); pixel[2] = Math.round(pixel[2] * weight); dstMat.put(y, x, pixel); } } setIcon(dstMat); } // 凸透镜 private void expandPic() { Mat dstMat = srcMat.clone(); for (int y = 0; y < srcMat.rows(); y++) { for (int x = 0; x < srcMat.cols(); x++) { int diffX = x - mouseX; // 不要取绝对值 int diffY = y - mouseY; // 不要取绝对值 double dist = Math.sqrt(diffX * diffX + diffY * diffY); // 距离 if (dist < radius) { // 在边界范围内的 int newX = (int) (dist * diffX / radius + mouseX); int newY = (int) (dist * diffY / radius + mouseY); double[] newPixel = srcMat.get(newY, newX); if (null != newPixel) { dstMat.put(y, x, newPixel); } } } } setIcon(dstMat); } private void extrudePic() { // https://blog.csdn.net/cbacq/article/details/17782895 Mat dstMat = srcMat.clone(); for (int y = 0; y < srcMat.rows(); y++) { for (int x = 0; x < srcMat.cols(); x++) { int diffX = x - mouseX; // 不要取绝对值 int diffY = y - mouseY; // 不要取绝对值 double dist = Math.sqrt(diffX * diffX + diffY * diffY); // 距离 if (dist < radius) { // 在边界范围内的 int newR = (int) (Math.sqrt(dist) * divisor); double theta = Math.atan2((double) diffY, (double) diffX);// 像素 到 点击位置 的连线的弧度 int newX = mouseX + (int) (newR * Math.cos(theta)); int newY = mouseY + (int) (newR * Math.sin(theta)); if (newX < 0) newX = 0; else if (newX >= srcMat.rows()) newX = srcMat.rows() - 1; if (newY < 0) newY = 0; else if (newY >= srcMat.cols()) newY = srcMat.cols() - 1; double[] newPixel = srcMat.get(newY, newX); if (null != newPixel) { dstMat.put(y, x, newPixel); } } } } setIcon(dstMat); } private void setIcon(Mat mat) { BufferedImage image = matToBufferedImage(mat); imageView.setIcon(new ImageIcon(image)); } private BufferedImage matToBufferedImage(Mat mat) { int cols = mat.cols(); int rows = mat.rows(); int elemSize = (int) mat.elemSize(); byte[] data = new byte[cols * rows * elemSize]; int type = BufferedImage.TYPE_BYTE_GRAY; mat.get(0, 0, data); if (3 == mat.channels()) { type = BufferedImage.TYPE_3BYTE_BGR; byte b; for (int i = 0; i < data.length; i = i + 3) { // opencv加载图片像素存在mat中的格式bgr 转为 rgb b = data[i]; data[i] = data[i + 2]; data[i + 2] = b; } } BufferedImage image = new BufferedImage(cols, rows, type); image.getRaster().setDataElements(0, 0, cols, rows, data); return image; } } |
一段python的参考代码：
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# 白天照手电筒效果 strength = 100 dst = np.zeros((rows, clols, 3), dtype="uint8") for i in range(rows): for j in range(cols): dist = math.pow((mouseY - j), 2) + math.pow((mouseX - i), 2)) distance = math.sqrt(dist) b = img[i,j][0] g = img[i,j][1] r = img[i,j][2] if (distance < radius): result = strength * radius b = b + result g = g + result r = r + result b = min(255, max(0, b)) g = min(255, max(0, g)) r = min(255, max(0, r)) dst[i, j] = np.uint8((b,g,r)) cv.imshow('',np.vstack((img, dst))) |
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声明
本文由崔维友 威格灵 cuiweiyou vigiles cuiweiyou 原创，转载请注明出处：http://www.gaohaiyan.com/3347.html
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