Make antsBrainExtraction.sh less sensitive to image size #1640
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Specifically, * Change resampling before antsAI from a fixed to a variable resolution. Smooth images by 4 voxels, then downsample to 5x template spacing. Previously, we downsampled to 4mm with a large smoothing kernel. * Change N4 from fixed spline spacing (200) to a 1x1x1 mesh. * Allow antsAI search parameters to be set on the command line.
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Addressing #1638.
Updated N4, downsampling procedure to not smooth and downsample non-human or neonate images too much.
I exposed the antsAI search parameters to the user because I think they are harder to guess from the input compared to the downsampling. The defaults are unchanged.