Add new method to Net

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

@@ -49,13 +49,14 @@ namespace dnn
         ~Net();
 
         int addLayer(const String &name, const String &type, LayerParams &params);
-        int getLayerId(LayerId layer);
-        void deleteLayer(LayerId layer);
+        int addLayerToPrev(const String &name, const String &type, LayerParams &params);
 
-        void setNetInputs(const std::vector<String> &inputBlobNames);
+        int getLayerId(const String &layer);
+        void deleteLayer(LayerId layer);
 
         void connect(String outPin, String inpPin);
         void connect(int outLayerId, int outNum, int inLayerId, int inNum);
+        void setNetInputs(const std::vector<String> &inputBlobNames);
 
         void forward();
         void forward(LayerId toLayer);

modules/dnn/src/dnn.cpp

@@ -383,7 +383,7 @@ int Net::addLayer(const String &name, const String &type, LayerParams &params)
 {
     if (name.find('.') != String::npos)
     {
-        CV_Error(Error::StsBadArg, "Added layer name \"" + name + "\" should not contain dot symbol");
+        CV_Error(Error::StsBadArg, "Added layer name \"" + name + "\" must not contain dot symbol");
         return -1;
     }
 
@@ -400,6 +400,14 @@ int Net::addLayer(const String &name, const String &type, LayerParams &params)
     return id;
 }
 
+int Net::addLayerToPrev(const String &name, const String &type, LayerParams &params)
+{
+    int prvLid = impl->lastLayerId;
+    int newLid = this->addLayer(name, type, params);
+    this->connect(prvLid, 0, newLid, 0);
+    return newLid;
+}
+
 void Net::connect(int outLayerId, int outNum, int inLayerId, int inNum)
 {
     impl->connect(outLayerId, outNum, inLayerId, inNum);
@@ -467,6 +475,18 @@ Blob Net::getParam(LayerId layer, int numParam)
     return layerBlobs[numParam];
 }
 
+int Net::getLayerId(const String &layer)
+{
+    return impl->getLayerId(layer);
+}
+
+void Net::deleteLayer(LayerId)
+{
+    CV_Error(Error::StsNotImplemented, "");
+}
+
+//////////////////////////////////////////////////////////////////////////
+
 Importer::~Importer()
 {
 
@@ -530,16 +550,5 @@ Ptr<Layer> LayerRegister::createLayerInstance(const String &_type, LayerParams&
     }
 }
 
-int Net::getLayerId(LayerId)
-{
-    CV_Error(Error::StsNotImplemented, "");
-    return -1;
-}
-
-void Net::deleteLayer(LayerId)
-{
-    CV_Error(Error::StsNotImplemented, "");
-}
-
 }
 }