filterBinomial: Creates a circular binomail filter

In hansoleorka/myR: Collection of r functions for hansoleorka

Description

Create a circular low-pass filter using binomial coefincient and filter weights obtained from Pascal's triangle. Used for filtering Canopy height model before local maxima detection

Usage

filterBinomial(w = 3, CircularRadius = "euclidan")

Arguments

w	filter size
CircularRadius	How to define the radius of the circular filter, either in a euclidian distance space (w-1)/2 or by using the pixels w/2. Defaults to "euclidian"

Details

The filter should be used toghter with the focal function in the raster-package.

Value

a matrix of filter weights

Author(s)

Hans Ole Orka [e-mail]

See Also

focal and filterLocalMaxima

Examples

windows()
par(mfcol=c(2,2))
(f <- filterBinomial(w=3))
image(f)
(f <- filterBinomial(w=5))
image(f)
(f <- filterBinomial(w=9))
(f <- filterBinomial(w=19))
image(f)

hansoleorka/myR documentation built on May 17, 2019, 2:29 p.m.