affine.im
From spatstat v1.64-1
by Adrian Baddeley
Apply Affine Transformation To Pixel Image
Applies any affine transformation of the plane (linear transformation plus vector shift) to a pixel image.
Usage
# S3 method for im
affine(X, mat=diag(c(1,1)), vec=c(0,0), …)
Arguments
- X
Pixel image (object of class
"im"
).- mat
Matrix representing a linear transformation.
- vec
Vector of length 2 representing a translation.
- …
Optional arguments passed to
as.mask
controlling the pixel resolution of the transformed image.
Details
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
.
The argument mat
must be a nonsingular \(2 \times 2\)
matrix.
This is a method for the generic function affine
.
Value
Another pixel image (of class "im"
) representing the
result of applying the affine transformation.
See Also
Examples
# NOT RUN {
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)
# }
Community examples
Looks like there are no examples yet.