Javaexamples-detect-face-in-image

Javaの例-画像内の顔を検出

問題の説明

Javaを使用して画像内の顔を検出する方法。

溶液

以下は、Javaを使用して画像内の顔を検出するプログラムです。

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.core.MatOfRect;
import org.opencv.core.Point;
import org.opencv.core.Rect;
import org.opencv.core.Scalar;

import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
import org.opencv.objdetect.CascadeClassifier;

public class DetectingFaceInAnImage {
   public static void main (String[] args) {

     //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 = "C:/opencv/facedetection_input.jpg";
      Mat src = Imgcodecs.imread(file);

     //Instantiating the CascadeClassifier
      String xmlFile = "C:/EXAMPLES/OpenCV/facedetect/lbpcascade_frontalface.xml";
      CascadeClassifier classifier = new CascadeClassifier(xmlFile);

     //Detecting the face in the snap
      MatOfRect faceDetections = new MatOfRect();
      classifier.detectMultiScale(src, faceDetections);
      System.out.println(String.format("Detected %s faces",
         faceDetections.toArray().length));

     //Drawing boxes
      for (Rect rect : faceDetections.toArray()) {
         Imgproc.rectangle(src,      //where to draw the box
         new Point(rect.x, rect.y),  //bottom left
         new Point(rect.x + rect.width, rect.y + rect.height), //top right
         new Scalar(0, 0, 255),
         3);   //RGB color
      }
     //Writing the image
      Imgcodecs.imwrite("C:/opencv/facedetect_output1.jpg", src);

      System.out.println("Image Processed");
   }
}

入力

顔検出入力

出力

顔検出出力