Added a missing assert and fixed some typos.

dlib/image_processing/object_detector.h

@@ -151,6 +151,17 @@ namespace dlib
         boxes_overlap(overlap_tester),
         w(w_)
     {
+        // make sure requires clause is not broken
+        DLIB_ASSERT(scanner_.get_num_detection_templates() > 0 &&
+                    w_.size() == scanner.get_num_dimensions() + 1, 
+            "\t object_detector::object_detector(scanner_,overlap_tester,w_)"
+            << "\n\t Invalid inputs were given to this function "
+            << "\n\t scanner_.get_num_detection_templates(): " << scanner_.get_num_detection_templates()
+            << "\n\t w_.size():                     " << w_.size()
+            << "\n\t scanner_.get_num_dimensions(): " << scanner_.get_num_dimensions()
+            << "\n\t this: " << this
+            );
+
         scanner.copy_configuration(scanner_);
     }
 

dlib/image_processing/object_detector_abstract.h

@@ -20,13 +20,12 @@ namespace dlib
     {
         /*!
             REQUIREMENTS ON overlap_tester_type
-                overlap_tester_type must be a type with an interface compatible
-                with test_box_overlap.
+                overlap_tester_type must be an implementation of the test_box_overlap
+                object defined in dlib/image_processing/box_overlap_testing_abstract.h.
 
             REQUIREMENTS ON image_scanner_type
-                image_scanner_type must be an instance of the scan_image_pyramid
-                templated defined in dlib/image_processing/scan_image_pyramid_abstract.h
-                or an object with a compatible interface.
+                image_scanner_type must be an implementation of 
+                dlib/image_processing/scan_image_pyramid_abstract.h
 
             WHAT THIS OBJECT REPRESENTS
                 This object is a tool for detecting the positions of objects in 
@@ -61,7 +60,7 @@ namespace dlib
         /*!
             requires
                 - w.size() == scanner.get_num_dimensions() + 1
-                - scanner.num_detection_templates() > 0
+                - scanner.get_num_detection_templates() > 0
             ensures
                 - When the operator() member function is called it will
                   invoke scanner.detect(w,dets,w(w.size()-1)), suppress

dlib/svm/structural_svm_object_detection_problem_abstract.h

@@ -67,7 +67,7 @@ namespace dlib
         /*!
             requires
                 - images.size() == truth_rects.size()
-                - scanner.num_detection_templates() > 0
+                - scanner.get_num_detection_templates() > 0
             ensures
                 - This object attempts to learn a mapping from the given images to the 
                   object locations given in truth_rects.  In particular, it attempts to