Code for Face Detection in Javacv using haar classifier.

FaceDetection.java

import com.googlecode.javacv.cpp.opencv_core.IplImage;
import static com.googlecode.javacv.cpp.opencv_core.*;
import static com.googlecode.javacv.cpp.opencv_highgui.*;
import static com.googlecode.javacv.cpp.opencv_objdetect.*;

public class FaceDetection{

	public static final String XML_FILE = 
			"resources/haarcascade_frontalface_default.xml";

	public static void main(String[] args){

		IplImage img = cvLoadImage("resources/lena.jpg");		
		detect(img);		
	}	

	public static void detect(IplImage src){

		CvHaarClassifierCascade cascade = new 
				CvHaarClassifierCascade(cvLoad(XML_FILE));
		CvMemStorage storage = CvMemStorage.create();
		CvSeq sign = cvHaarDetectObjects(
				src,
				cascade,
				storage,
				1.5,
				3,
				CV_HAAR_DO_CANNY_PRUNING);

		cvClearMemStorage(storage);

		int total_Faces = sign.total();		

		for(int i = 0; i < total_Faces; i++){
			CvRect r = new CvRect(cvGetSeqElem(sign, i));
			cvRectangle (
					src,
					cvPoint(r.x(), r.y()),
					cvPoint(r.width() + r.x(), r.height() + r.y()),
					CvScalar.RED,
					2,
					CV_AA,
					0);

		}

		cvShowImage("Result", src);
		cvWaitKey(0);

	}			
}

Dear Nikhil,

Thanks for sharing.

I am getting the following excetpion while executing the code downloaded from your repository on GitHub (https://github.com/nikhil9/FaceDetection)

OpenJDK 64-Bit Server VM warning: You have loaded library /usr/local/lib/libopencv_core.so.3.0.0 which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c ', or link it with '-z noexecstack'.
Exception in thread "main" java.lang.UnsatisfiedLinkError: /tmp/javacpp5998446228712/libjniopencv_core.so: libopencv_core.so.2.4: cannot open shared object file: No such file or directory
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary1(ClassLoader.java:1965)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1890)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1851)
at java.lang.Runtime.load0(Runtime.java:795)
at java.lang.System.load(System.java:1062)
at com.googlecode.javacpp.Loader.loadLibrary(Loader.java:418)
at com.googlecode.javacpp.Loader.load(Loader.java:368)
at com.googlecode.javacpp.Loader.load(Loader.java:315)
at com.googlecode.javacv.cpp.opencv_core.(opencv_core.java:131)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at com.googlecode.javacpp.Loader.load(Loader.java:334)
at com.googlecode.javacv.cpp.opencv_imgproc.(opencv_imgproc.java:96)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at com.googlecode.javacpp.Loader.load(Loader.java:334)
at com.googlecode.javacv.cpp.opencv_highgui.(opencv_highgui.java:85)
at FaceDetection.main(FaceDetection.java:15)

From where can I download the shared library?
Which version of javac are you using?

Regards,