crop: Image cropping

In wvtool: Image Tools for Automated Wood Identification

Description

image cropping from the center.

Usage

crop(x, width=300, height=300, shift=c(0,0))

Arguments

x	A raster or a matrix
width	width for cropping
height	height for cropping
shift	shift of the cropped position from the center

Value

A raster or a matrix

Examples

data(camphora)	
par(mfrow=c(2,2))
image(rot90c(camphora),col=gray(c(0:255)/255), main="original", useRaster=TRUE, axes=FALSE, asp=1)
image(rot90c(crop(camphora,200,100)),col=gray(c(0:255)/255),
main="cropped from the center", useRaster=TRUE, axes=FALSE, asp=0.5)
image(rot90c(crop(camphora,200,200)),col=gray(c(0:255)/255),
main="cropped from the center", useRaster=TRUE, axes=FALSE, asp=1)
image(rot90c(crop(camphora,200,200,shift=c(50,50))),col=gray(c(0:255)/255),
main="cropped from shifted position c(50,50)", useRaster=TRUE, axes=FALSE, asp=1)

Example output

wvtool documentation built on May 1, 2019, 10:27 p.m.