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 −
广告