From be1c7e50e1e8809ea56f2c9d472eccd8ffd73a97 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 04:57:58 +0200
Subject: Adding upstream version 1.44.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 ml/dlib/examples/surf_ex.cpp | 82 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 ml/dlib/examples/surf_ex.cpp

(limited to 'ml/dlib/examples/surf_ex.cpp')

diff --git a/ml/dlib/examples/surf_ex.cpp b/ml/dlib/examples/surf_ex.cpp
new file mode 100644
index 00000000..70fe1900
--- /dev/null
+++ b/ml/dlib/examples/surf_ex.cpp
@@ -0,0 +1,82 @@
+// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
+/*
+
+    This is a simple example illustrating the use of the get_surf_points() function.  It
+    pulls out SURF points from an input image and displays them on the screen as an overlay
+    on the image.
+
+    For a description of the SURF algorithm you should consult the following papers:
+        This is the original paper which introduced the algorithm:
+            SURF: Speeded Up Robust Features
+            By Herbert Bay, Tinne Tuytelaars, and Luc Van Gool
+
+        This paper provides a nice detailed overview of how the algorithm works:
+            Notes on the OpenSURF Library by Christopher Evans
+
+*/
+
+
+
+#include <dlib/image_keypoint/draw_surf_points.h>
+#include <dlib/image_io.h>
+#include <dlib/image_keypoint.h>
+#include <fstream>
+
+
+using namespace std;
+using namespace dlib;
+
+//  ----------------------------------------------------------------------------
+
+int main(int argc, char** argv)
+{
+    try
+    {
+        // make sure the user entered an argument to this program
+        if (argc != 2)
+        {
+            cout << "error, you have to enter a BMP file as an argument to this program" << endl;
+            return 1;
+        }
+
+        // Here we declare an image object that can store rgb_pixels.  Note that in dlib
+        // there is no explicit image object, just a 2D array and various pixel types.  
+        array2d<rgb_pixel> img;
+
+        // Now load the image file into our image.  If something is wrong then load_image()
+        // will throw an exception.  Also, if you linked with libpng and libjpeg then
+        // load_image() can load PNG and JPEG files in addition to BMP files. 
+        load_image(img, argv[1]);
+
+        // Get SURF points from the image.  Note that get_surf_points() has some optional
+        // arguments that allow you to control the number of points you get back.  Here we
+        // simply take the default.
+        std::vector<surf_point> sp = get_surf_points(img);
+        cout << "number of SURF points found: "<< sp.size() << endl;
+
+        if (sp.size() > 0)
+        {
+            // A surf_point object contains a lot of information describing each point.
+            // The most important fields are shown below:
+            cout << "center of first SURF point: "<< sp[0].p.center << endl;
+            cout << "pyramid scale:     " << sp[0].p.scale << endl;
+            cout << "SURF descriptor: \n" << sp[0].des << endl;
+        }
+
+        // Create a window to display the input image and the SURF points.  (Note that
+        // you can zoom into the window by holding CTRL and scrolling the mouse wheel)
+        image_window my_window(img);
+        draw_surf_points(my_window, sp);
+
+        // wait until the user closes the window before we let the program 
+        // terminate.
+        my_window.wait_until_closed();
+    }
+    catch (exception& e)
+    {
+        cout << "exception thrown: " << e.what() << endl;
+    }
+}
+
+//  ----------------------------------------------------------------------------
+
-- 
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