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Applies any affine transformation of the plane (linear transformation plus vector shift) to a pixel image.
# S3 method for im affine(X, mat=diag(c(1,1)), vec=c(0,0), ...)
Another pixel image (of class "im") representing the result of applying the affine transformation.
"im"
Pixel image (object of class "im").
Matrix representing a linear transformation.
Vector of length 2 representing a translation.
Optional arguments passed to as.mask controlling the pixel resolution of the transformed image.
as.mask
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner rolfturner@posteo.net
The image is subjected first to the linear transformation represented by mat (multiplying on the left by mat), and then the result is translated by the vector vec.
mat
vec
The argument mat must be a nonsingular \(2 \times 2\) matrix.
This is a method for the generic function affine.
affine
affine, affine.ppp, affine.psp, affine.owin, rotate, shift
affine.ppp
affine.psp
affine.owin
rotate
shift
X <- setcov(owin()) stretch <- diag(c(2,3)) Y <- affine(X, mat=stretch) shear <- matrix(c(1,0,0.6,1),ncol=2, nrow=2) Z <- affine(X, mat=shear)
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