[Fiji/ImgLib2] Create a partial projection of a stack, with a sliding interval of defined size.

Sliding_Window_Projection.groovy

#@ Dataset input
#@ OpService ops
#@ Integer (label="Width of sliding window (frames)") window
#@output projected

// Add a new dimension of window size
added = ops.transform().addDimensionView(input, 0, window-1)
extended = ops.transform().extendBorderView(added)

// Shear along time dimension,
// with sliding window dimension as reference
tilted = ops.transform().shearView(extended, added, 2, 3)

// Project along sliding window dimension
projected = ops.create().img(input)
op = ops.op("stats.mean", input)
ops.transform().project(projected, tilted, op, 3)