Added another car finding example

examples/CMakeLists.txt

@@ -122,6 +122,7 @@ if (NOT USING_OLD_VISUAL_STUDIO_COMPILER)
    add_gui_example(dnn_mmod_dog_hipsterizer)
    add_gui_example(dnn_imagenet_ex)
    add_gui_example(dnn_mmod_find_cars_ex)
+   add_gui_example(dnn_mmod_find_cars2_ex)
    add_example(dnn_mmod_train_find_cars_ex)
    if (NOT MSVC)
       # Don't try to compile this program using Visual Studio since it causes the

examples/dnn_mmod_find_cars2_ex.cpp

+// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
+/*
+    This example shows how to run a CNN based vehicle detector using dlib.  The
+    example loads a pretrained model and uses it to find the front and rear ends
+    of cars in an image.  The model used by this example was trained by the
+    dnn_mmod_train_find_cars_ex.cpp example program on this dataset:   
+        http://dlib.net/files/data/dlib_front_and_rear_vehicles_v1.tar
+    
+    Users who are just learning about dlib's deep learning API should read
+    the dnn_introduction_ex.cpp and dnn_introduction2_ex.cpp examples to learn
+    how the API works.  For an introduction to the object detection method you
+    should read dnn_mmod_ex.cpp.
+
+    You can also see a video of this vehicle detector running on YouTube:
+        https://www.youtube.com/watch?v=OHbJ7HhbG74
+*/
+
+
+#include <iostream>
+#include <dlib/dnn.h>
+#include <dlib/image_io.h>
+#include <dlib/gui_widgets.h>
+#include <dlib/image_processing.h>
+
+using namespace std;
+using namespace dlib;
+
+
+
+// The rear view vehicle detector network
+template <long num_filters, typename SUBNET> using con5d = con<num_filters,5,5,2,2,SUBNET>;
+template <long num_filters, typename SUBNET> using con5  = con<num_filters,5,5,1,1,SUBNET>;
+template <typename SUBNET> using downsampler  = relu<affine<con5d<32, relu<affine<con5d<32, relu<affine<con5d<16,SUBNET>>>>>>>>>;
+template <typename SUBNET> using rcon5  = relu<affine<con5<55,SUBNET>>>;
+using net_type = loss_mmod<con<1,9,9,1,1,rcon5<rcon5<rcon5<downsampler<input_rgb_image_pyramid<pyramid_down<6>>>>>>>>;
+
+// ----------------------------------------------------------------------------------------
+
+int main() try
+{
+    net_type net;
+    shape_predictor sp;
+    // You can get this file from http://dlib.net/files/mmod_front_and_rear_end_vehicle_detector.dat.bz2
+    // This network was produced by the dnn_mmod_train_find_cars_ex.cpp example program.
+    // As you can see, the file also includes a separately trained shape_predictor.  To see
+    // a generic example of how to train those refer to train_shape_predictor_ex.cpp.
+    deserialize("mmod_front_and_rear_end_vehicle_detector.dat") >> net >> sp;
+
+    matrix<rgb_pixel> img;
+    load_image(img, "../mmod_cars_test_image2.jpg");
+
+    image_window win;
+    win.set_image(img);
+
+    // Run the detector on the image and show us the output.
+    for (auto&& d : net(img))
+    {
+        // We use a shape_predictor to refine the exact shape and location of the detection
+        // box.  This shape_predictor is trained to simply output the 4 corner points of
+        // the box.  So all we do is make a rectangle that tightly contains those 4 points
+        // and that rectangle is our refined detection position.
+        auto fd = sp(img,d);
+        rectangle rect;
+        for (unsigned long j = 0; j < fd.num_parts(); ++j)
+            rect += fd.part(j);
+
+        if (d.label == "rear")
+            win.add_overlay(rect, rgb_pixel(255,0,0), d.label);
+        else 
+            win.add_overlay(rect, rgb_pixel(255,255,0), d.label);
+    }
+
+
+
+
+    cout << "Hit enter to end program" << endl;
+    cin.get();
+}
+catch(image_load_error& e)
+{
+    cout << e.what() << endl;
+    cout << "The test image is located in the examples folder.  So you should run this program from a sub folder so that the relative path is correct." << endl;
+}
+catch(serialization_error& e)
+{
+    cout << e.what() << endl;
+    cout << "The correct model file can be obtained from: http://dlib.net/files/mmod_front_and_rear_end_vehicle_detector.dat.bz2" << endl;
+}
+catch(std::exception& e)
+{
+    cout << e.what() << endl;
+}
+
+
+
+