Merge pull request #1006 from dkurt:get_layer_inputs

Getting layer inputs (#1006)

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

@@ -182,6 +182,9 @@ namespace dnn //! This namespace is used for dnn module functionlaity.
         /** @brief Returns pointer to layer with specified name which the network use. */
         CV_WRAP Ptr<Layer> getLayer(LayerId layerId);
 
+        /** @brief Returns pointers to input layers of specific layer. */
+        CV_WRAP std::vector<Ptr<Layer> > getLayerInputs(LayerId layerId);
+
         /** @brief Delete layer for the network (not implemented yet) */
         CV_WRAP void deleteLayer(LayerId layer);
 

modules/dnn/src/dnn.cpp

@@ -568,10 +568,25 @@ Ptr<Layer> Net::getLayer(LayerId layerId)
 {
     LayerData &ld = impl->getLayerData(layerId);
     if (!ld.layerInstance)
-        CV_Error(Error::StsNullPtr, format("Requseted layer \"%s\" was not initialized", ld.name.c_str()));
+        CV_Error(Error::StsNullPtr, format("Requested layer \"%s\" was not initialized", ld.name.c_str()));
     return ld.layerInstance;
 }
 
+std::vector<Ptr<Layer> > Net::getLayerInputs(LayerId layerId)
+{
+    LayerData &ld = impl->getLayerData(layerId);
+    if (!ld.layerInstance)
+        CV_Error(Error::StsNullPtr, format("Requested layer \"%s\" was not initialized", ld.name.c_str()));
+
+    std::vector<Ptr<Layer> > inputLayers;
+    inputLayers.reserve(ld.inputLayersId.size());
+    std::set<int>::iterator it;
+    for (it = ld.inputLayersId.begin(); it != ld.inputLayersId.end(); ++it) {
+        inputLayers.push_back(getLayer(*it));
+    }
+    return inputLayers;
+}
+
 std::vector<String> Net::getLayerNames() const
 {
     std::vector<String> res;