ENH: add nodatalabel parameters in ImageClassifier and KMeansClassification app

Modules/Applications/AppClassification/app/otbImageClassifier.cxx

@@ -102,6 +102,11 @@ private:
     SetParameterDescription("imstat", "A XML file containing mean and standard deviation to center and reduce samples before classification (produced by ComputeImagesStatistics application).");
     MandatoryOff("imstat");
 
+    AddParameter(ParameterType_Int, "nodatalabel", "Label mask value");
+    SetParameterDescription("nodatalabel", "TODO");
+    SetDefaultParameterInt("nodatalabel", 0);
+    MandatoryOff("nodatalabel");
+
     AddParameter(ParameterType_OutputImage, "out",  "Output Image");
     SetParameterDescription( "out", "Output image containing class labels");
     SetDefaultOutputPixelType( "out", ImagePixelType_uint8);
@@ -166,6 +171,8 @@ private:
     m_ClassificationFilter = ClassificationFilterType::New();
     m_ClassificationFilter->SetModel(m_Model);
 
+    m_ClassificationFilter->SetDefaultLabel(GetParameterInt("nodatalabel"));
+
     // Normalize input image if asked
     if(IsParameterEnabled("imstat")  )
       {

Modules/Applications/AppClassification/include/otbClassKMeansBase.txx

@@ -65,6 +65,12 @@ void ClassKMeansBase::InitKMSampling()
   SetParameterDescription("ct", "Convergence threshold for class centroid  (L2 distance, by default 0.0001).");
   SetDefaultParameterFloat("ct", 0.0001);
   MandatoryOff("ct");
+
+  AddParameter(ParameterType_Int, "nodatalabel", "Label for the NoData class");
+  SetParameterDescription("nodatalabel", "TODO");
+  SetDefaultParameterInt("nodatalabel", 0);
+  MandatoryOff("nodatalabel");
+
 /*
   AddParameter(ParameterType_InputImage, "vm", "Validity Mask");
   SetParameterDescription("vm", "Validity mask. Only non-zero pixels will be used to estimate KMeans modes.");
@@ -259,6 +265,7 @@ void ClassKMeansBase::ComputeImageStatistics(std::string imageFileName,
 
 void ClassKMeansBase::KMeansClassif()
 {
+  GetInternalApplication("classif")->SetParameterInt("nodatalabel", GetParameterInt("nodatalabel"), false);
   ExecuteInternal( "classif" );
 }
 

Modules/Applications/AppClassification/test/CMakeLists.txt

@@ -640,7 +640,8 @@ if(OTB_USE_SHARK)
     -ct 0.0000001
     -sampler periodic
     -rand 121212
-    -out ${TEMP}/apTvClKMeansImageClassificationFilterOutput.tif
+    -nodatalabel 255
+    -out ${TEMP}/apTvClKMeansImageClassificationFilterOutput.tif uint8
     -cleanup 0
     VALID   --compare-image ${NOTOL}
     ${OTBAPP_BASELINE}/apTvClKMeansImageClassificationFilterOutput.tif