Added draw_surf_points().

dlib/image_keypoint/draw_surf_points.h

+// Copyright (C) 2013  Davis E. King (davis@dlib.net)
+// License: Boost Software License   See LICENSE.txt for the full license.
+#ifndef DLIB_DRAW_SURf_POINTS_H_
+#define DLIB_DRAW_SURf_POINTS_H_
+
+#include "surf.h"
+#include "../gui_widgets.h"
+#include "draw_surf_points_abstract.h"
+
+namespace dlib
+{
+
+// ----------------------------------------------------------------------------------------
+    inline void draw_surf_points (
+        image_window& win,
+        const std::vector<surf_point>& sp
+    )
+    {
+        for (unsigned long i = 0; i < sp.size(); ++i)
+        {
+            const unsigned long radius = static_cast<unsigned long>(sp[i].p.scale*3);
+            const point center(sp[i].p.center);
+            point direction = center + point(radius,0);
+            // SURF descriptors are rotated by sp[i].angle.  So we want to include a visual
+            // indication of this rotation on our overlay.
+            direction = rotate_point(center, direction, sp[i].angle);
+
+            win.add_overlay(image_display::overlay_circle(center, radius, rgb_pixel(0,255,0)));
+            // Draw a line showing the orientation of the SURF descriptor.
+            win.add_overlay(center, direction, rgb_pixel(255,0,0));
+        }
+    }
+
+// ----------------------------------------------------------------------------------------
+
+}
+
+#endif // DLIB_DRAW_SURf_POINTS_H_
+
+

dlib/image_keypoint/draw_surf_points_abstract.h

+// Copyright (C) 2013  Davis E. King (davis@dlib.net)
+// License: Boost Software License   See LICENSE.txt for the full license.
+#undef DLIB_DRAW_SURf_POINTS_ABSTRACT_H_
+#ifdef DLIB_DRAW_SURf_POINTS_ABSTRACT_H_
+
+#include "surf_abstract.h"
+#include "../gui_widgets.h"
+
+namespace dlib
+{
+
+// ----------------------------------------------------------------------------------------
+
+    void draw_surf_points (
+        image_window& win,
+        const std::vector<surf_point>& sp
+    );
+    /*!
+        ensures
+            - draws all the SURF points in sp onto the given image_window.  They
+              are drawn as overlay circles with extra lines to indicate the rotation
+              of the SURF descriptor.
+    !*/
+
+// ----------------------------------------------------------------------------------------
+
+}
+
+#endif // DLIB_DRAW_SURf_POINTS_ABSTRACT_H_
+