使用 OpenCV 的 Java 图像变换示例。
Imgproc 类中的 warpAffine() 方法对指定图像应用仿射变换。此方法接受以下内容 −
表示源、目标和变换矩阵的三个 Mat 对象。
表示输出图像大小的整数。
要平移图像,请创建一个平移矩阵,并将其与其他参数一同作为变换矩阵传递给此方法。
示例
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.image.ImageView;
import javafx.scene.image.WritableImage;
import javafx.stage.Stage;
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfPoint2f;
import org.opencv.core.Point;
import org.opencv.core.Size;
import org.opencv.highgui.HighGui;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
public class TranslatingAnImage extends Application {
public void start(Stage stage) throws IOException {
//Loading the OpenCV core library
System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
//Reading image data
String file ="D:\Images\elephant.jpg";
Mat src = Imgcodecs.imread(file);
//Creating destination matrix
Mat dst = new Mat(src.rows(), src.cols(), src.type());
Point p1 = new Point( 0,0 );
Point p2 = new Point( src.cols() - 1, 0 );
Point p3 = new Point( 0, src.rows() - 1 );
Point p4 = new Point( src.cols()*0.0, src.rows()*0.33 );
Point p5 = new Point( src.cols()*0.85, src.rows()*0.25 );
Point p6 = new Point( src.cols()*0.15, src.rows()*0.7 );
MatOfPoint2f ma1 = new MatOfPoint2f(p1,p2,p3);
MatOfPoint2f ma2 = new MatOfPoint2f(p4,p5,p6);
//Creating the transformation matrix
Mat tranformMatrix = Imgproc.getAffineTransform(ma1,ma2);
//Creating object of the class Size
Size size = new Size(src.cols(), src.cols());
//Applying Wrap Affine
Imgproc.warpAffine(src, dst, tranformMatrix, size);
//Converting matrix to JavaFX writable image
Image img = HighGui.toBufferedImage(dst);
WritableImage writableImage= SwingFXUtils.toFXImage((BufferedImage) img, null);
//Setting the image view
ImageView imageView = new ImageView(writableImage);
imageView.setX(10);
imageView.setY(10);
imageView.setFitWidth(575);
imageView.setPreserveRatio(true);
//Setting the Scene object
Group root = new Group(imageView);
Scene scene = new Scene(root, 595, 400);
stage.setTitle("Image Translation example");
stage.setScene(scene);
stage.show();
}
public static void main(String args[]) {
launch(args);
}
}输入图像

输出
执行上述程序会生成以下输出 −

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