Perform morphological erosion of a window, a line segment pattern or a point pattern by a disc.
erosion(w, r, …)
# S3 method for owin
erosion(w, r, shrink.frame=TRUE, …,
strict=FALSE, polygonal=NULL)
# S3 method for ppp
erosion(w, r,…)
# S3 method for psp
erosion(w, r,…)
A window (object of class "owin"
or a line segment pattern (object of class "psp"
)
or a point pattern (object of class "ppp"
).
positive number: the radius of erosion.
logical: if TRUE
, erode the bounding
rectangle as well.
extra arguments to as.mask
controlling the pixel resolution, if pixel approximation is used.
Logical flag determining the fate of boundary pixels, if pixel approximation is used. See details.
Logical flag indicating whether to compute a polygonal
approximation to the erosion (polygonal=TRUE
) or
a pixel grid approximation (polygonal=FALSE
).
If r > 0
, an object of class "owin"
representing the
eroded region (or NULL
if this region is empty).
If r=0
, the result is identical to w
.
The morphological erosion of a set \(W\) by a distance \(r > 0\) is the subset consisting of all points \(x \in W\) such that the distance from \(x\) to the boundary of \(W\) is greater than or equal to \(r\). In other words it is the result of trimming a margin of width \(r\) off the set \(W\).
If polygonal=TRUE
then a polygonal approximation
to the erosion is computed.
If polygonal=FALSE
then a pixel approximation
to the erosion is computed from the distance map of w
.
The arguments "\dots"
are passed to as.mask
to control the pixel resolution.
The erosion consists of all pixels whose distance
from the boundary of w
is strictly greater than r
(if
strict=TRUE
) or is greater than or equal to r
(if
strict=FALSE
).
When w
is a window, the default (when polygonal=NULL
)
is to compute a polygonal approximation if
w
is a rectangle or polygonal window, and to compute a
pixel approximation if w
is a window of type "mask"
.
If shrink.frame
is false, the resulting window is given the
same outer, bounding rectangle as the original window w
.
If shrink.frame
is true, the original bounding rectangle
is also eroded by the same distance r
.
To simply compute the area of the eroded window,
use eroded.areas
.
dilation
for the opposite operation.
erosionAny
for morphological erosion using any shape.
# NOT RUN {
plot(letterR, main="erosion(letterR, 0.2)")
plot(erosion(letterR, 0.2), add=TRUE, col="red")
# }
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