Fixing yet more compiler warnings on older versions of gcc

dlib/image_transforms/segment_image.h

@@ -483,8 +483,8 @@ namespace dlib
                 if (set1 != set2)
                 {
                     const diff_type diff = sorted_edges[i].diff;
-                    const diff_type tau1 = k/data[set1].component_size;
-                    const diff_type tau2 = k/data[set2].component_size;
+                    const diff_type tau1 = static_cast<diff_type>(k/data[set1].component_size);
+                    const diff_type tau2 = static_cast<diff_type>(k/data[set2].component_size);
 
                     const diff_type mint = std::min(data[set1].internal_diff + tau1, 
                         data[set2].internal_diff + tau2);

dlib/test/object_detector.cpp

@@ -258,7 +258,9 @@ namespace
             {
                 for (long c = 0; c < images[i].nc(); ++c)
                 {
-                    images[i][r][c] = put_in_range(0,255,images[i][r][c] + 10*rnd.get_random_gaussian());
+                    typedef typename image_array_type::type image_type;
+                    typedef typename image_type::type type;
+                    images[i][r][c] = (type)put_in_range(0,255,images[i][r][c] + 10*rnd.get_random_gaussian());
                 }
             }
         }
@@ -356,7 +358,9 @@ namespace
             {
                 for (long c = 0; c < images[i].nc(); ++c)
                 {
-                    images[i][r][c] = put_in_range(0,255,images[i][r][c] + 40*rnd.get_random_gaussian());
+                    typedef typename image_array_type::type image_type;
+                    typedef typename image_type::type type;
+                    images[i][r][c] = (type)put_in_range(0,255,images[i][r][c] + 40*rnd.get_random_gaussian());
                 }
             }
         }