BUG: Mantis-942: conversion between GDAL geotransform and OTB origin/spacing

Code/Common/otbLabelImageToVectorDataFilter.txx

@@ -164,8 +164,8 @@ LabelImageToVectorDataFilter<TInputImage, TPrecision>
     IndexType  bufferIndexOrigin = this->GetInput()->GetBufferedRegion().GetIndex();
     OriginType  bufferOrigin;
     this->GetInput()->TransformIndexToPhysicalPoint(bufferIndexOrigin, bufferOrigin);
-    geoTransform[0] = bufferOrigin[0];
-    geoTransform[3] = bufferOrigin[1];
+    geoTransform[0] = bufferOrigin[0] - 0.5 * this->GetInput()->GetSpacing()[0];
+    geoTransform[3] = bufferOrigin[1] - 0.5 * this->GetInput()->GetSpacing()[1];
     geoTransform[1] = this->GetInput()->GetSpacing()[0];
     geoTransform[5] = this->GetInput()->GetSpacing()[1];
     // FIXME: Here component 1 and 4 should be replaced by the orientation parameters
@@ -234,8 +234,8 @@ LabelImageToVectorDataFilter<TInputImage, TPrecision>
       // the spacing is unchanged, the origin is relative to the buffered region
       bufferIndexOrigin = this->GetInputMask()->GetBufferedRegion().GetIndex();
       this->GetInputMask()->TransformIndexToPhysicalPoint(bufferIndexOrigin, bufferOrigin);
-      geoTransform[0] = bufferOrigin[0];
-      geoTransform[3] = bufferOrigin[1];
+      geoTransform[0] = bufferOrigin[0] - 0.5 * this->GetInputMask()->GetSpacing()[0];
+      geoTransform[3] = bufferOrigin[1] - 0.5 * this->GetInputMask()->GetSpacing()[1];
       geoTransform[1] = this->GetInputMask()->GetSpacing()[0];
       geoTransform[5] = this->GetInputMask()->GetSpacing()[1];
       // FIXME: Here component 1 and 4 should be replaced by the orientation parameters