javaopencv摄像头,OpenCV使⽤摄像头
在本章中，我们将学习如何使⽤OpenCV使⽤系统摄像头捕获帧。org.opencv.videoio包中的VideoCapture类包含使⽤相机捕获视频的类和⽅法。下⾯来⼀步⼀步学习如何捕捉帧 -
第1步：加载OpenCV本机库
在使⽤OpenCV库编写Java代码时，使⽤loadLibrary()加载OpenCV本地库。加载OpenCV本机库，如下所⽰ -
// Loading the core library
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
第2步：实例化视频捕获类
使⽤本教程前⾯提到的函数来实例化Mat类。
// Instantiating the VideoCapture class (camera:: 0)
VideoCapture capture = new VideoCapture(0);
第3步：阅取帧
可以使⽤VideoCapture类的read()⽅法从相机读取帧。此⽅法接受类Mat的对象来存储读取的帧。
// Reading the next video frame from the camera
Mat matrix = new Mat();
⽰例
以下程序演⽰如何使⽤相机捕捉帧并使⽤JavaFX窗⼝显⽰。它也保存捕获的帧。
package com.yiibai.cameraface;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.awt.image.WritableRaster;
import java.io.FileNotFoundException;
import java.io.IOException;
import javafx.application.Application;
bed.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 Core;
import Mat;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.videoio.VideoCapture;
public class CameraSnapshotJavaFX extends Application {
Mat matrix = null;
@Override
public void start(Stage stage) throws FileNotFoundException, IOException { // Capturing the snapshot from the camera
CameraSnapshotJavaFX obj = new CameraSnapshotJavaFX(); WritableImage writableImage = obj.capureSnapShot();
// Saving the image
obj.saveImage();
// Setting the image view
ImageView imageView = new ImageView(writableImage);
// setting the fit height and width of the image view
imageView.setFitHeight(400);
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("Capturing an image");
// Adding scene to the stage
stage.setScene(scene);
// Displaying the contents of the stage
stage.show();
}
public WritableImage capureSnapShot() {
WritableImage WritableImage = null;
// Loading the OpenCV core library
System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
// Instantiating the VideoCapture class (camera:: 0)
VideoCapture capture = new VideoCapture(0);
// Reading the next video frame from the camera
Mat matrix = new Mat();
// If camera is opened
if( capture.isOpened()) {
// If there is next video frame
if (ad(matrix)) {
// Creating BuffredImage from the matrix
BufferedImage image = new BufferedImage(matrix.width(),
matrix.height(), BufferedImage.TYPE_3BYTE_BGR);
WritableRaster raster = Raster();
DataBufferByte dataBuffer = (DataBufferByte) DataBuffer(); byte[] data = Data();
<(0, 0, data);
this.matrix = matrix;
// Creating the Writable Image
WritableImage = FXImage(image, null);
}
}
return WritableImage;
}
public void saveImage() {
// Saving the Image
String file = "F:/worksp/opencv/images/sanpshot.jpg";
// Instantiating the imgcodecs classjavaswing和javafx
Imgcodecs imageCodecs = new Imgcodecs();
// Saving it again
imageCodecs.imwrite(file, matrix);
}
public static void main(String args[]) {
launch(args);
}
}
执⾏上⾯⽰例代码，得到以下结果 -
如果打开指定的路径，可以观察到保存⼀个.jpg⽂件(F:/worksp/opencv/images/sanpshot.jpg)。¥ 我要打赏
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