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PERF: MeanImageFilter faster, using BufferedImageNeighborhoodPixelAccessPolicy #1365

Merged
merged 2 commits into from Oct 31, 2019
Merged

PERF: MeanImageFilter faster, using BufferedImageNeighborhoodPixelAccessPolicy #1365

merged 2 commits into from Oct 31, 2019

Commits on Oct 30, 2019

  1. ENH: Add BufferedImageNeighborhoodPixelAccessPolicy for faster access 

    Added `BufferedImageNeighborhoodPixelAccessPolicy`, for faster pixel
access during neighborhood iteration.

Unlike `ConstantBoundaryImageNeighborhoodPixelAccessPolicy` and
`ZeroFluxNeumannImageNeighborhoodPixelAccessPolicy`, this new pixel
access policy for `ShapedImageNeighborhoodRange` assumes that the pixel
index of the selected neighbor is always within the buffered region of
the image.
    @N-Dekker
    N-Dekker committed Oct 30, 2019
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  2. PERF: Use ShapedImageNeighborhoodRange in MeanImageFilter 

    Improved the performance of `MeanImageFilter::Update`
by replacing its local `itk::ConstNeighborhoodIterator` variable by
an `Experimental::ShapedImageNeighborhoodRange` variable, using the new
`BufferedImageNeighborhoodPixelAccessPolicy`.

~40% reduction of the run-time duration was observed on a
`filter->Update()` call, using VS2017, processing a 256x256x256 image.
For a 1024x1024x16 image, the performance improvement appeared even higher.
    @N-Dekker
    N-Dekker committed Oct 30, 2019
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