VTK  9.3.1

ParallelImaging → Imaging Relation

File in Filters/ParallelImagingIncludes file in Filters/Imaging
vtkPComputeHistogram2DOutliers.hvtkComputeHistogram2DOutliers.h
vtkPExtractHistogram2D.hvtkExtractHistogram2D.h
vtkPPairwiseExtractHistogram2D.hvtkPairwiseExtractHistogram2D.h