Added a function for computing Felzenszwalb's 31 channel HOG image

representation.

dlib/image_transforms.h

@@ -16,6 +16,7 @@
 #include "image_transforms/colormaps.h"
 #include "image_transforms/segment_image.h"
 #include "image_transforms/interpolation.h"
+#include "image_transforms/fhog.h"
 
 #endif // DLIB_IMAGE_TRANSFORMs_
 

dlib/image_transforms/fhog_abstract.h

+// Copyright (C) 2013  Davis E. King (davis@dlib.net)
+// License: Boost Software License   See LICENSE.txt for the full license.
+#undef DLIB_fHOG_ABSTRACT_H__
+#ifdef DLIB_fHOG_ABSTRACT_H__
+
+#include "../matrix/matrix_abstract.h"
+#include "../array2d/array2d_kernel_abstract.h"
+#include "../array/array_kernel_abstract.h"
+
+namespace dlib
+{
+
+// ----------------------------------------------------------------------------------------
+
+    template <
+        typename image_type,
+        typename T, 
+        typename mm1, 
+        typename mm2
+        >
+    void extract_fhog_features(
+        const image_type& img, 
+        dlib::array<array2d<T,mm1>,mm2>& hog, 
+        int bin_size = 8
+    );
+
+    template <
+        typename image_type, 
+        typename T, 
+        typename mm
+        >
+    void extract_fhog_features(
+        const image_type& img, 
+        array2d<matrix<T,31,1>,mm>& hog, 
+        int bin_size = 8
+    );
+
+// ----------------------------------------------------------------------------------------
+
+    inline point image_to_fhog (
+        point p,
+        int bin_size 
+    );
+
+// ----------------------------------------------------------------------------------------
+
+    inline point fhog_to_image (
+        point p,
+        int bin_size 
+    );
+
+// ----------------------------------------------------------------------------------------
+
+    template <
+        typename T, 
+        typename mm1, 
+        typename mm2
+        >
+    matrix<unsigned char> draw_fhog(
+        const dlib::array<array2d<T,mm1>,mm2>& hog,
+        const long w = 15
+    );
+
+// ----------------------------------------------------------------------------------------
+
+    template <
+        typename T, 
+        typename mm
+        >
+    matrix<unsigned char> draw_fhog(
+        const array2d<matrix<T,31,1>,mm>& hog,
+        const long w = 15
+    );
+
+// ----------------------------------------------------------------------------------------
+
+}
+
+#endif // DLIB_fHOG_ABSTRACT_H__
+
+