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How to detect a face in an image using Java
Problem Description
How to detect a face in an image using Java.
Solution
Following is the program to detect a face in an image using java.
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"); } }
Input
Output
java_opencv
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