ENH: Add Supervised or Unsupervised classifier selection for learning.

Modules/Applications/AppClassification/include/otbLearningApplicationBase.h

@@ -160,15 +160,31 @@ protected:
                 std::string modelPath);
 
   /** Init method that creates all the parameters for machine learning models */
-  void DoInit();
+  void DoInit() ITK_OVERRIDE;
 
   /** Flag to switch between classification and regression mode.
    * False by default, child classes may change it in their constructor */
   bool m_RegressionFlag;
 
-private:
+  /** enum use to selected classifier category */
+  enum ClassifierCategory {
+    Supervised,
+    Unsupervised
+  };
+
+  /** Enum to switch between unsupervised or supervised classification.
+   * Supervised by default, child classes may change it in their constructor */
+  ClassifierCategory m_ClassifierCategory;
 
+private:
   /** Specific Init and Train methods for each machine learning model */
+
+  /** Init Parameters for Supervised Classifier */
+  void InitSupervisedClassifierParams();
+
+  /** Init Parameters for Unsupervised Classifier */
+  void InitUnsupervisedClassifierParams();
+
   //@{
 #ifdef OTB_USE_LIBSVM 
   void InitLibSVMParams();

Modules/Applications/AppClassification/include/otbLearningApplicationBase.txx

@@ -28,7 +28,7 @@ namespace Wrapper
 
 template <class TInputValue, class TOutputValue>
 LearningApplicationBase<TInputValue,TOutputValue>
-::LearningApplicationBase() : m_RegressionFlag(false)
+::LearningApplicationBase() : m_RegressionFlag(false), m_ClassifierCategory(Supervised)
 {
 }
 
@@ -50,8 +50,25 @@ LearningApplicationBase<TInputValue,TOutputValue>
   AddParameter(ParameterType_Choice, "classifier", "Classifier to use for the training");
   SetParameterDescription("classifier", "Choice of the classifier to use for the training.");
 
+  switch(m_ClassifierCategory)
+    {
+    case Unsupervised:
+      InitUnsupervisedClassifierParams();
+      break;
+    case Supervised:
+    default :
+      InitSupervisedClassifierParams();
+    }
+}
+
+template <class TInputValue, class TOutputValue>
+void
+LearningApplicationBase<TInputValue,TOutputValue>
+::InitSupervisedClassifierParams()
+{
+
   //Group LibSVM
-#ifdef OTB_USE_LIBSVM 
+#ifdef OTB_USE_LIBSVM
   InitLibSVMParams();
 #endif
 
@@ -78,7 +95,14 @@ LearningApplicationBase<TInputValue,TOutputValue>
   InitSharkRandomForestsParams();
   InitSharkKMeansParams();
 #endif
-  
+}
+
+template <class TInputValue, class TOutputValue>
+void
+LearningApplicationBase<TInputValue,TOutputValue>
+::InitUnsupervisedClassifierParams()
+{
+
 }
 
 template <class TInputValue, class TOutputValue>