Added face detection example program

examples/CMakeLists.txt

@@ -32,6 +32,7 @@ add_example(config_reader_ex)
 add_example(custom_trainer_ex)
 add_example(dir_nav_ex)
 add_example(empirical_kernel_map_ex)
+add_example(face_detection_ex)
 add_example(fhog_ex)
 add_example(fhog_object_detector_ex)
 add_example(file_to_code_ex)

examples/face_detection_ex.cpp

+// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
+/*
+
+
+*/
+
+
+#include <dlib/image_processing/frontal_face_detector.h>
+#include <dlib/gui_widgets.h>
+#include <dlib/image_io.h>
+#include <iostream>
+
+using namespace dlib;
+using namespace std;
+
+// ----------------------------------------------------------------------------------------
+
+int main(int argc, char** argv)
+{  
+    try
+    {
+        frontal_face_detector detector = get_frontal_face_detector();
+        image_window win;
+        for (int i = 1; i < argc; ++i)
+        {
+            array2d<unsigned char> img;
+            load_image(img, argv[i]);
+            pyramid_up(img);
+            std::vector<rectangle> dets = detector(img);
+
+            cout << "number of faces detected: " << dets.size() << endl;
+            win.clear_overlay();
+            win.set_image(img);
+            win.add_overlay(dets, rgb_pixel(255,0,0));
+            // Pause until the user hits the enter key
+            cin.get();
+        }
+    }
+    catch (exception& e)
+    {
+        cout << "\nexception thrown!" << endl;
+        cout << e.what() << endl;
+    }
+}
+
+// ----------------------------------------------------------------------------------------
+