REFAC: Implemented the LUT conversion for ImageMetadataBase::ToKeywordlist

Data/Baseline/OTB/Files/ioTvcoreImageMetadataTest.txt

@@ -35,6 +35,7 @@ md3_append: {{"Extra.Comment": "Test Extrakeys",
 "ProjectionEPSG": "4326",
 "ProjectionWKT": "UTM projRef",
 "ProjectionProj": "+proj=longlat +datum=WGS84 +no_defs ",
+"SpectralSensitivity": "{"Axes": [{"Size": "3", "Origin": "0", "Spacing": "1", "Values": []}, ], "Array": [1, 2, 3, ]}",
 "RPC": "{"LineOffset": "0", "SampleOffset": "0", "LatOffset": "0", "LonOffset": "0", "HeightOffset": "0", "LineScale": "0", "SampleScale": "0", "LatScale": "0", "LonScale": "0", "HeightScale": "0", "LineNum": [ "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0", ], "LineDen": [ "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0", ], "SampleNum": [ "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0", ], "SampleDen": [ "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0",  "0", ], }",
 "ProductionDate": "2009-08-10T10:30:08.142149Z",
 "GCP": "{"Projection": "", [{"GCP_Id": "", "GCP_Info": "", "GCP_Row": "0", "GCP_Col": "0", "GCP_X": "0", "GCP_Y": "0", "GCP_Z": "0", }, ]}",

Modules/Core/Metadata/include/otbMetaDataKey.h

@@ -233,6 +233,8 @@ struct LUTAxis
   double Spacing;
   /** list of measurements (if irregular sampling) */
   std::vector<double> Values;
+  /** Export to JSON */
+  std::string ToJSON(bool multiline=false) const;
 };
 
 template <unsigned int VDim> class LUT
@@ -241,6 +243,8 @@ public:
   LUTAxis Axes[VDim];
   
   std::vector<double> Array;
+
+  std::string ToJSON(bool multiline=false) const;
 };
 
 typedef LUT<1> LUT1D;

Modules/Core/Metadata/src/otbImageMetadata.cxx

@@ -253,9 +253,15 @@ void ImageMetadataBase::ToKeywordlist(Keywordlist& kwl) const
     kwl.emplace(MetaData::MDNumNames[kv.first], oss.str());
   }
   // Converting the LUT1DKeys
-  // TODO : LUT1D
+  for (const auto& kv : LUT1DKeys)
+  {
+    kwl.emplace(MetaData::MDL1DNames[kv.first], kv.second.ToJSON());
+  }
   // Convereting the LUT2DKeys
-  // TODO : LUT2D
+  for (const auto& kv : LUT2DKeys)
+  {
+    kwl.emplace(MetaData::MDL2DNames[kv.first], kv.second.ToJSON());
+  }
   // Converting the TimeKeys
   for (const auto& kv : TimeKeys)
   {

Modules/Core/Metadata/src/otbMetaDataKey.cxx

@@ -187,6 +187,49 @@ std::istream& operator>>(std::istream& is, Time& val)
 
 #undef _OTB_ISTREAM_EXPECT
 
+std::string LUTAxis::ToJSON(bool multiline) const
+{
+  std::ostringstream oss;
+  std::string sep;
+  if (multiline)
+  {
+    sep = "\n";
+  }
+  oss << "{"
+      << "\"Size\": \"" << Size << "\", " << sep
+      << "\"Origin\": \"" << Origin << "\", " << sep
+      << "\"Spacing\": \"" << Spacing << "\", " << sep
+	  << "\"Values\": [";
+  for (const auto& value : Values)
+    oss << value << ", ";
+  oss << "]}";
+  return oss.str();
+}
+
+template <unsigned int VDim>
+std::string LUT<VDim>::ToJSON(bool multiline) const
+{
+  std::ostringstream oss;
+  std::string sep;
+  if (multiline)
+  {
+    sep = "\n";
+  }
+  oss << "{"
+      << "\"Axes\": [";
+  for (unsigned int loop = 0 ; loop < VDim  ; loop++)
+    oss << Axes[loop].ToJSON(multiline) << ", ";
+  oss << "], " << sep
+      << "\"Array\": [";
+  for (const auto& value : Array)
+    oss << value << ", ";
+  oss << "]}";
+  return oss.str();
+}
+
+template class LUT<1>;
+template class LUT<2>;
+
 // array<pair<> >
 // boost::flat_map<> 
 std::map<MDNum, std::string> MDNumNames = {

Modules/Core/Metadata/test/otbImageMetadataTest.cxx

@@ -198,6 +198,13 @@ int otbImageMetadataTest(int argc, char* argv[])
   Projection::GCPParam gcpStruct;
   gcpStruct.GCPs.push_back(OTB_GCP());
   md4.Add(MDGeom::GCP, gcpStruct);
+  MetaData::LUT1D lut1d;
+  lut1d.Axes[0].Size = 3;
+  lut1d.Axes[0].Origin = 0;
+  lut1d.Axes[0].Spacing = 1;
+  std::vector<double>array({1.0, 2.0, 3.0});
+  lut1d.Array = array;
+  md4.Add(MDL1D::SpectralSensitivity, lut1d);
   bmd.Add(MDStr::BandName, "B4");
   md4.Bands.push_back(bmd);
   md3.append(md4);