1 import org.opencv.core.Core; 2 import org.opencv.core.Mat; 3 import org.opencv.core.MatOfRect; 4 import org.opencv.core.Point; 5 import org.opencv.core.Rect; 6 import org.opencv.core.Scalar; 7 import org.opencv.imgcodecs.Imgcodecs; 8 import org.opencv.objdetect.CascadeClassifier; 9 10 /* 11 * Detects faces in an image, draws boxes around them, and writes the results 12 * to "faceDetection.png". 13 */ 14 public class DetectFaceDemo { 15 public void run() { 16 System.out.println("\nRunning DetectFaceDemo"); 17 18 // Create a face detector from the cascade file in the resources 19 // directory. 20 CascadeClassifier faceDetector = new CascadeClassifier(getClass() 21 .getResource("/lbpcascade_frontalface.xml").getPath()); 22 Mat image = Imgcodecs.imread(getClass().getResource( 23 "/AverageMaleFace.jpg").getPath()); 24 25 // Detect faces in the image. 26 // MatOfRect is a special container class for Rect. 27 MatOfRect faceDetections = new MatOfRect(); 28 faceDetector.detectMultiScale(image, faceDetections); 29 30 System.out.println(String.format("Detected %s faces", 31 faceDetections.toArray().length)); 32 33 // Draw a bounding box around each face. 34 for (Rect rect : faceDetections.toArray()) { 35 Imgproc.rectangle(image, new Point(rect.x, rect.y), new Point(rect.x 36 + rect.width, rect.y + rect.height), new Scalar(0, 255, 0)); 37 } 38 39 // Save the visualized detection. 40 String filename = "faceDetection.png"; 41 System.out.println(String.format("Writing %s", filename)); 42 Imgcodecs.imwrite(filename, image); 43 } 44 } 45
