Fixed some python functions not taking as wide a range of images as they did in

previous dlib versions.

tools/python/src/conversion.h

@@ -31,7 +31,7 @@ void images_and_nested_params_to_dlib(
         for (py::iterator param_it = params_it->begin(); param_it != params_it->end(); ++param_it)
             params[image_idx].push_back(param_it->cast<param_type>());
 
-        images[image_idx] = image_it->cast<py::object>();
+        assign_image(images[image_idx], image_it->cast<py::array>());
     }
 }
 

tools/python/src/shape_predictor.cpp

@@ -128,7 +128,7 @@ inline double test_shape_predictor_with_images_py (
              ++det_it)
           detections[i].push_back(det_it->cast<full_object_detection>());
 
-        images[i] = pyimages[i];
+        assign_image(images[i], pyimages[i].cast<py::array>());
         if (num_scales > 0)
         {
             if (num_boxes != py::len(pyscales[i]))