Added a method to set the random_cropper's random seed.

dlib/image_transforms/random_cropper.h

@@ -21,8 +21,15 @@ namespace dlib
         double min_object_height = 0.25; // cropped object will be at least this fraction of the height of the image.
         double max_object_height = 0.7; // cropped object will be at most this fraction of the height of the image.
         double background_crops_fraction = 0.1;
+
+        std::mutex rnd_mutex;
+        dlib::rand rnd;
     public:
 
+        void set_seed (
+            time_t seed
+        ) { rnd = dlib::rand(seed); }
+
         double get_background_crops_fraction (
         ) const { return background_crops_fraction; }
 
@@ -241,8 +248,6 @@ namespace dlib
         }
 
 
-        std::mutex rnd_mutex;
-        dlib::rand rnd;
 
     };
 

dlib/image_transforms/random_cropper_abstract.h

@@ -40,6 +40,14 @@ namespace dlib
                 - #get_background_crops_fraction() == 0.1
         !*/
 
+        void set_seed (
+            time_t seed
+        );
+        /*!
+            ensures
+                - Seeds the internal random number generator with the given seed.
+        !*/
+
         double get_background_crops_fraction (
         ) const; 
         /*!