ENH : correct boundaries computation in MeanShift filter (missing start index)

Code/BasicFilters/otbMeanShiftImageFilter.txx

@@ -396,7 +396,7 @@ MeanShiftImageFilter<TInputImage,TOutputImage,TLabeledOutput,TBufferConverter>
     for (int i = 0; i<regionList->GetRegionCount(static_cast<int>(label)); ++i)
     {
       boundIndex[0]= regionIndeces[i] % clusterBoudariesOutputPtr->GetRequestedRegion().GetSize()[0];
-      boundIndex[1]= regionIndeces[i] / clusterBoudariesOutputPtr->GetRequestedRegion().GetSize()[0];
+      boundIndex[1]= (regionIndeces[i] / clusterBoudariesOutputPtr->GetRequestedRegion().GetSize()[0])+clusterBoudariesOutputPtr->GetRequestedRegion().GetIndex()[1];
       if (clusterBoudariesOutputPtr->GetBufferedRegion().IsInside(boundIndex))
       {
         clusterBoudariesOutputPtr->SetPixel(boundIndex,1);