1 仿射变换
仿射变换：一种二维坐标到二维坐标的线性变换，它保持二维图像的平直性与平行性，即变换后直线依然是直线，平行的线依然平行。
package com.xu.opencv.image;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import org.opencv.core.Mat;
import org.opencv.core.MatOfPoint2f;
import org.opencv.core.Point;
import org.opencv.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
public class ImageChange {
static {
String os = System.getProperty("os.name");
String type = System.getProperty("sun.arch.data.model");
if (os.toUpperCase().contains("WINDOWS")) {
File lib;
if (type.endsWith("64")) {
lib = new File("lib\\OpenCV-455\\x64\\" + System.mapLibraryName("opencv_java455"));
} else {
lib = new File("lib\\OpenCV-455\\x86\\" + System.mapLibraryName("opencv_java455"));
}
System.load(lib.getAbsolutePath());
}
}
public static void main(String[] args) {
warpAffine();
}
public static void warpAffine() {
Mat src = Imgcodecs.imread("C:\\Users\\Administrator\\Desktop\\1.png");
MatOfPoint2f point1 = new MatOfPoint2f(new Point(0, 0), new Point(0, src.rows()), new Point(src.cols(), 0));
MatOfPoint2f point2 = new MatOfPoint2f(new Point(src.cols() * 0.1, src.cols() * 0.1), new Point(src.cols() * 0.2, src.cols() * 0.7),
new Point(src.cols() * 0.7, src.cols() * 0.2));
// 获取 放射变换 矩阵
Mat dst = Imgproc.getAffineTransform(point1, point2);
// 进行 仿射变换
Mat image = new Mat();
Imgproc.warpAffine(src, image, dst, src.size());
HighGui.imshow("原图", src);
HighGui.imshow("仿射变换", image);
HighGui.waitKey(0);
}
}
2 透视变换
透视变换：透视变换是将一个平面投影到另一个平面的过程，也称投影映射。是一种非线性变换，表现为可将梯形变换为平行四边形，因此需要四个点来确定透视变换矩阵
package com.xu.opencv.image;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import org.opencv.core.Mat;
import org.opencv.core.MatOfPoint2f;
import org.opencv.core.Point;
import org.opencv.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
public class ImageChange {
static {
String os = System.getProperty("os.name");
String type = System.getProperty("sun.arch.data.model");
if (os.toUpperCase().contains("WINDOWS")) {
File lib;
if (type.endsWith("64")) {
lib = new File("lib\\OpenCV-455\\x64\\" + System.mapLibraryName("opencv_java455"));
} else {
lib = new File("lib\\OpenCV-455\\x86\\" + System.mapLibraryName("opencv_java455"));
}
System.load(lib.getAbsolutePath());
}
}
public static void main(String[] args) {
warpPerspective();
}
public static void warpPerspective() {
Mat src = Imgcodecs.imread("C:\\Users\\Administrator\\Desktop\\1.png");
MatOfPoint2f point1 = new MatOfPoint2f();
List<Point> before = new ArrayList<>();
before.add(new Point(0, 0));
before.add(new Point(src.cols(), 0));
before.add(new Point(0, src.rows()));
before.add(new Point(src.cols(), src.rows()));
point1.fromList(before);
MatOfPoint2f point2 = new MatOfPoint2f();
List<Point> after = new ArrayList<>();
after.add(new Point(src.cols(), src.rows()));
after.add(new Point(src.cols() * 0.1, src.rows() * 0.8));
after.add(new Point(src.cols() * 0.7, src.rows() * 0.3));
after.add(new Point(0, 0));
point2.fromList(after);
// 获取 透视变换 矩阵
Mat dst = Imgproc.getPerspectiveTransform(point1, point2);
// 进行 透视变换
Mat image = new Mat();
Imgproc.warpPerspective(src, image, dst, src.size());
HighGui.imshow("原图", src);
HighGui.imshow("透视变换", image);
HighGui.waitKey(0);
}
}
3 图像旋转
package com.xu.opencv.image;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import org.opencv.core.Mat;
import org.opencv.core.MatOfPoint2f;
import org.opencv.core.Point;
import org.opencv.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
public class ImageChange {
static {
String os = System.getProperty("os.name");
String type = System.getProperty("sun.arch.data.model");
if (os.toUpperCase().contains("WINDOWS")) {
File lib;
if (type.endsWith("64")) {
lib = new File("lib\\OpenCV-455\\x64\\" + System.mapLibraryName("opencv_java455"));
} else {
lib = new File("lib\\OpenCV-455\\x86\\" + System.mapLibraryName("opencv_java455"));
}
System.load(lib.getAbsolutePath());
}
}
public static void main(String[] args) {
rotate();
}
public static void rotate() {
Mat src = Imgcodecs.imread("C:\\Users\\Administrator\\Desktop\\1.png");
// 图像中心
Point center = new Point(src.cols() / 2, src.rows() / 2);
// 获取 旋转 矩阵
Mat dst = Imgproc.getRotationMatrix2D(center, 45, 0.5);
// 进行 图像旋转
Mat image = new Mat();
Imgproc.warpAffine(src, image, dst, src.size());
HighGui.imshow("原图", src);
HighGui.imshow("图像旋转", image);
HighGui.waitKey(0);
}
}
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