fd: Frame Differencing
In aaronlikens/framediff: Performs a simple frame differencing algorithm

Performs frame differencing on a sequence of video frames

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fd(dir, do.filter = FALSE, m = 2, cutoff = 1, do.plot = TRUE,
split_screen = TRUE, verbose = FALSE, shuffle = FALSE,
mag = TRUE)

`dir`	dir specifies a directory containing sequentially numbered images. Uses current directory by default.
`do.filter`	logical indicating whether filtering should be performed
`m`	integer order of the butterworth filter
`cutoff`	real-valued frequency spectrum cutoff proportion for butterworth filter
`do.plot`	logical indicating whether a plot should be generated
`split_screen`	logical indicating whether frame differencing should be applied separately to each 1/2 of a screen.
`verbose`	logical indicating whether feedback about which frame is being anlayzed
`shuffle`	logical indicating whether image order should be shuffled for the purpose of surrogate analysis
`mag`	logical indicating whether magnitude (absolute frame difference) or difference should be returned. Default is TRUE