如何使用 OpenCV Java 庫檢測影像的關鍵點?
org.opencv.features2d.Feature2D(抽象)類的detect()方法檢測給定影像的關鍵點。對該方法,你需要傳入一個表示源影像的Mat物件和一個空的MatOfKeyPoint物件以儲存讀取到的關鍵點。
你可以使用org.opencv.features2d.Features2d類的drawKeypoints()方法在影像上繪製關鍵點。
注意
由於 Feature2D 是一個抽象類,你需要例項化其子類之一來呼叫 detect() 方法。此處我們使用了 FastFeatureDetector 類。
Features2D和Features2d是 features2d 包的兩個不同的類,不要弄混了...
示例
import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfKeyPoint;
import org.opencv.core.Scalar;
import org.opencv.features2d.FastFeatureDetector;
import org.opencv.features2d.Features2d;
import org.opencv.highgui.HighGui;z
import org.opencv.imgcodecs.Imgcodecs;
public class DetectingKeyPoints{
public static void main(String args[]) throws Exception {
//Loading the OpenCV core library
System.loadLibrary( Core.NATIVE_LIBRARY_NAME );
//Reading the contents of the image
String file ="D:\Images\javafx_graphical.jpg";
Mat src = Imgcodecs.imread(file);
//Reading the key points of the image
Mat dst = new Mat();
MatOfKeyPoint matOfKeyPoints = new MatOfKeyPoint();
FastFeatureDetector featureDetector = FastFeatureDetector.create();
featureDetector.detect(src, matOfKeyPoints);
//Drawing the detected key points
Features2d.drawKeypoints(src, matOfKeyPoints, dst, new Scalar(0, 0, 255));
HighGui.imshow("Feature Detection", dst);
HighGui.waitKey();
}
}輸入影像

輸出

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