使用Hough线变换可以在给定的图像中检测直线。在OpenCV中有两种可用的Hough线变换,分别是标准Hough线变换和概率Hough线变换。
您可以使用Imgproc类的HoughLinesP()方法应用概率Hough线变换,该方法接受以下参数:
表示源图像和存储线条参数(r, Φ)的向量的两个Mat对象。
表示参数r(像素)和Φ(弧度)的分辨率的两个double变量。
表示“检测”一条线所需的最小交点数的整数。
以下Java示例使用OpenCV的概率Hough线变换检测图像中的线条:
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.Point; import org.opencv.core.Scalar; import org.opencv.highgui.HighGui; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class HoughLineProbabilisticTransform extends Application { public void start(Stage stage) throws IOException { //Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); String file ="D:\Images\road4.jpg"; Mat src = Imgcodecs.imread(file); //Converting the image to Gray Mat gray = new Mat(); Imgproc.cvtColor(src, gray, Imgproc.COLOR_RGBA2GRAY); //Detecting the edges Mat edges = new Mat(); Imgproc.Canny(gray, edges, 60, 60*3, 3, false); // Changing the color of the canny Mat cannyColor = new Mat(); Imgproc.cvtColor(edges, cannyColor, Imgproc.COLOR_GRAY2BGR); //Detecting the hough lines from (canny) Mat lines = new Mat(); Imgproc.HoughLinesP(edges, lines, 1, Math.PI/180, 50, 50, 10); for (int i = 0; i < lines.rows(); i++) { double[] data = lines.get(i, 0); //Drawing lines on the image Point pt1 = new Point(data[0], data[1]); Point pt2 = new Point(data[2], data[3]); Imgproc.line(cannyColor, pt1, pt2, new Scalar(0, 0, 255), 3); } //Converting matrix to JavaFX writable image Image img = HighGui.toBufferedImage(cannyColor); 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("Hough Line Transform"); stage.setScene(scene); stage.show(); } public static void main(String args[]) { launch(args); } }
执行后,上述代码将产生以下输出 −
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