Java OpenCV图像处理之仿射变换,透视变换,旋转详解
目录
- 1 仿射变换
- 2 透视变换
- 3 图像旋转
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; /** * @author Administrator */ 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(); } /** * OpenCV 仿射变换 * * @return void * @Author: hyacinth * @Title: warpAffine * @Description: TODO * @date: 2022年2月22日12点32分 */ 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; /** * @author Administrator */ 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(); } /** * OpenCV 透视变换 * * @return void * @Author: hyacinth * @Title: warpPerspective * @Description: TODO * @date: 2022年2月22日12点32分 */ 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; /** * @author Administrator */ 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(); } /** * OpenCV 透视变换 * * @return void * @Author: hyacinth * @Title: rotate * @Description: TODO * @date: 2022年2月22日12点32分 */ 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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