Imgproc.pyrUp
Imgproc.pyrDown
Imgproc.resize
Imgproc.getRotationMatrix2D
Imgproc.warpAffine
工具类见 http://www.gaohaiyan.com/3229.html
本例完整代码：
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import java.awt.image.BufferedImage; import javax.swing.ImageIcon; 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.Size; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; /** * 图片缩放 */ public class Transform extends JFrame { private JLabel imageView; private double pyramid = 1; private double resize = 1; private double matrix = 1; private Mat srcMat; public Transform(String img) { JLabel pyramidLabel = new JLabel("高斯金字塔缩放:复位"); pyramidLabel.setBounds(15, 10, 120, 15); JSlider pyramidBar = new JSlider(0, 2); pyramidBar.setValue(2); pyramidBar.setBounds(140, 5, 220, 25); pyramidBar.addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) { int value = pyramidBar.getValue(); if (0 == value) { pyramid = 0.5; pyramidLabel.setText("高斯金字塔缩放:" + pyramid); } else if (1 == value) { pyramid = 2; pyramidLabel.setText("高斯金字塔缩放:" + pyramid); } else { pyramid = 1; pyramidLabel.setText("高斯金字塔缩放:复原"); } gaussianPic(); } }); JLabel resizeLabel = new JLabel("resize缩放:原始"); resizeLabel.setBounds(15, 40, 120, 15); JSlider resizeBar = new JSlider(1, 20); resizeBar.setValue(10); resizeBar.setBounds(140, 35, 220, 25); resizeBar.addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) { int value = resizeBar.getValue(); if (10 == value || 11 == value) { resize = 1; resizeLabel.setText("resize缩放:原始"); } else if (value > 11) { resize = value - 11; resizeLabel.setText("resize放大:" + resize); // 1 - 9 } else { resize = value / 10d; resizeLabel.setText("resize缩小:" + resize); // 0.1 - 0.9 } resizePic(); } }); JLabel matrixLabel = new JLabel("matrix缩放:" + matrix); matrixLabel.setBounds(15, 70, 120, 15); JSlider matrixBar = new JSlider(1, 20); matrixBar.setValue(10); matrixBar.setBounds(140, 65, 220, 25); matrixBar.addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) { int value = matrixBar.getValue(); if (10 == value || 11 == value) { matrix = 1; } else if (value > 11) { matrix = value - 11; } else { matrix = value / 10d; } matrixLabel.setText("matrix缩放:" + matrix); matrixPic(); } }); srcMat = Imgcodecs.imread(img); int width = srcMat.width(); int height = srcMat.height(); imageView = new JLabel(""); imageView.setBounds(40, 100, width, height); this.setTitle("图片缩放"); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setSize(width + 100, height + 140); this.getContentPane().setLayout(null); this.getContentPane().add(pyramidLabel); this.getContentPane().add(pyramidBar); this.getContentPane().add(resizeLabel); this.getContentPane().add(resizeBar); this.getContentPane().add(matrixLabel); this.getContentPane().add(matrixBar); this.getContentPane().add(imageView); setIcon(srcMat); } private void gaussianPic() { int rows = srcMat.rows(); int cols = srcMat.cols(); Mat mat = new Mat(rows, cols, srcMat.type()); if (pyramid == 2) { // 放大 Imgproc.pyrUp(srcMat, mat, new Size(rows * pyramid, cols * pyramid)); // 图像金字塔所选用的图像必须是正方形。std::abs(dsize.width - ssize.width*2) == dsize.width % 2 && std::abs(dsize.height - ssize.height*2) == dsize.height % 2 in function 'pyrUp_' } else if (pyramid == 0.5) { // 缩小 Imgproc.pyrDown(srcMat, mat, new Size(rows * pyramid, cols * pyramid)); // 图像金字塔所选用的图像必须是正方形。每次都是原基础上的2或0.5倍。 } else { mat = srcMat; } setIcon(mat); } private void resizePic() { int rows = srcMat.rows(); int cols = srcMat.cols(); int ir = (int) (rows * resize); int ic = (int) (cols * resize); Mat mat = new Mat(ir, ic, srcMat.type()); // 目标mat即原mat的resize倍 // Mat src, Mat dst, Size dsize, double fx水平方向, double fy垂直方向, int interpolation插值方式：0临近点，1临近2*2范围的点，2临近4*4范围点，3覆盖区平均值 Imgproc.resize(srcMat, mat, mat.size(), resize, resize, 0); // 按resize倍放大 setIcon(mat); } private void matrixPic() { int rows = srcMat.rows(); int cols = srcMat.cols(); int ir = (int) (rows * matrix); int ic = (int) (cols * matrix); Mat mat = new Mat(ir, ic, srcMat.type()); Point center = new Point(rows / 2, cols / 2); double angle = 0d; Mat rotMat = Imgproc.getRotationMatrix2D(center, angle, matrix); // 生成中心放大矩阵。(Point center, double angle, double scale) Imgproc.warpAffine(srcMat, mat, rotMat, mat.size()); // 根据矩阵转换到目标mat (Mat src, Mat dst, Mat M, Size dsize) setIcon(mat); } private void setIcon(Mat mat) { BufferedImage image = CVUtil.matToBufferedImage(mat); // CVUtil 见 http://www.gaohaiyan.com/3229.html imageView.setIcon(new ImageIcon(image)); } } |
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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/3251.html
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