可以使用imgproc
类的方法arrowedLine()
将文本添加到图像。 以下是此方法的语法。
putText(img, text, org, fontFace, fontScale, Scalar color, int thickness)
该方法接受以下参数 -
Mat
对象。Point
对象。double
的变量表示与字体特定的基本大小相乘的缩放因子。1
。以下程序演示如何将文本添加到图像并使用JavaFX窗口显示它。
package zyiz.net; import java.awt.image.BufferedImage; import java.io.ByteArrayInputStream; import java.io.InputStream; import javax.imageio.ImageIO; 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.MatOfByte; import org.opencv.core.Point; import org.opencv.core.Scalar; import org.opencv.imgcodecs.Imgcodecs; import org.opencv.imgproc.Imgproc; public class AddingTextToImage extends Application { Mat matrix = null; @Override public void start(Stage stage) throws Exception { // Capturing the snapshot from the camera AddingTextToImage obj = new AddingTextToImage(); WritableImage writableImage = obj.LoadImage(); // Setting the image view ImageView imageView = new ImageView(writableImage); // setting the fit height and width of the image view imageView.setFitHeight(600); imageView.setFitWidth(600); // Setting the preserve ratio of the image view imageView.setPreserveRatio(true); // Creating a Group object Group root = new Group(imageView); // Creating a scene object Scene scene = new Scene(root, 600, 400); // Setting title to the Stage stage.setTitle("OpenCV添加文本到图像示例"); // Adding scene to the stage stage.setScene(scene); // Displaying the contents of the stage stage.show(); } public WritableImage LoadImage() throws Exception { // Loading the OpenCV core library System.loadLibrary( Core.NATIVE_LIBRARY_NAME ); // Reading the Image from the file and storing it in to a Matrix object String file ="F:/worksp/opencv/images/sample2.jpg"; Mat matrix = Imgcodecs.imread(file); String addText = "This is a Text String ~"; // Adding Text Imgproc.putText ( matrix, // Matrix obj of the image addText, // Text to be added new Point(100, 150), // point Core.FONT_HERSHEY_SIMPLEX , // front face 1, // front scale new Scalar(0, 0, 0), // Scalar object for color // Thickness ); // Encoding the image MatOfByte matOfByte = new MatOfByte(); Imgcodecs.imencode(".jpg", matrix, matOfByte); // Storing the encoded Mat in a byte array byte[] byteArray = matOfByte.toArray(); // Displaying the image InputStream in = new ByteArrayInputStream(byteArray); BufferedImage bufImage = ImageIO.read(in); this.matrix = matrix; //Creating the Writable Image WritableImage writableImage = SwingFXUtils.toFXImage(bufImage, null); return writableImage; } public static void main(String args[]) { launch(args); } }
执行上面示例代码,得到以下结果 -