Java OpenCV图像处理之仿射变换,透视变换,旋转详解
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); } }
到此这篇关于Java OpenCV图像处理之仿射变换,透视变换,旋转,平移,缩放详解的文章就介绍到这了,更多相关Java OpenCV图像处理内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!
相关文章
IntelliJ IDEA 部署 Web 项目,看这一篇够了!
这篇文章主要介绍了IntelliJ IDEA 部署 Web 项目的图文教程,本文通过图文并茂的形式给大家介绍的非常详细,对大家的学习或工作具有一定的参考借鉴价值,需要的朋友可以参考下2020-05-05Java concurrency之AtomicLongArray原子类_动力节点Java学院整理
这篇文章主要介绍了Java concurrency之AtomicLongArray原子类的相关知识,感兴趣的朋友参考下吧2017-06-06HTTP基本认证(Basic Authentication)的JAVA实例代码
下面小编就为大家带来一篇HTTP基本认证(Basic Authentication)的JAVA实例代码。小编觉得挺不错的,现在就分享给大家,也给大家做个参考。一起跟随小编过来看看吧2016-11-11
最新评论