Merge pull request #12644 from dkurt:dnn_out_layers_names

modules/dnn/include/opencv2/dnn/dnn.hpp

@@ -535,6 +535,11 @@ CV__DNN_EXPERIMENTAL_NS_BEGIN
         /** @brief Returns indexes of layers with unconnected outputs.
          */
         CV_WRAP std::vector<int> getUnconnectedOutLayers() const;
+
+        /** @brief Returns names of layers with unconnected outputs.
+         */
+        CV_WRAP std::vector<String> getUnconnectedOutLayersNames() const;
+
         /** @brief Returns input and output shapes for all layers in loaded model;
          *  preliminary inferencing isn't necessary.
          *  @param netInputShapes shapes for all input blobs in net input layer.

modules/dnn/src/dnn.cpp

@@ -2789,6 +2789,18 @@ std::vector<int> Net::getUnconnectedOutLayers() const
     return layersIds;
 }
 
+std::vector<String> Net::getUnconnectedOutLayersNames() const
+{
+    std::vector<int> ids = getUnconnectedOutLayers();
+    const size_t n = ids.size();
+    std::vector<String> names(n);
+    for (size_t i = 0; i < n; ++i)
+    {
+        names[i] = impl->layers[ids[i]].name;
+    }
+    return names;
+}
+
 void Net::getLayersShapes(const ShapesVec& netInputShapes,
                           std::vector<int>& layersIds,
                           std::vector<ShapesVec>& inLayersShapes,