Convert Line Segment Pattern to Pixel Image
Converts a line segment pattern to a pixel image by measuring the length or number of lines intersecting each pixel.
## S3 method for class 'psp'
pixellate(x, W=NULL, ..., weights = NULL,
what=c("length", "number"),
DivideByPixelArea=FALSE)x |
Line segment pattern (object of class |
W |
Optional window (object of class |
... |
Optional arguments passed to |
weights |
Optional vector of weights associated with each line segment. |
what |
String (partially matched) indicating whether to compute the
total length of intersection ( |
DivideByPixelArea |
Logical value, indicating whether the resulting pixel values should be divided by the pixel area. |
This function converts a line segment pattern to a pixel image by computing, for each pixel, the total length of intersection between the pixel and the line segments. Alternatively it can count the number of line segments intersecting each pixel.
This is a method for the generic function
pixellate for the class of line segment patterns.
If weights are given, then the length of the intersection
between line segment i and pixel j is multiplied by
weights[i] before the lengths are summed for each pixel.
A pixel image (object of class "im") with numeric values.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk.
Use as.mask.psp if you only want to know
which pixels are intersected by lines.
X <- psp(runif(10),runif(10), runif(10), runif(10), window=owin()) plot(pixellate(X)) plot(X, add=TRUE) sum(lengths_psp(X)) sum(pixellate(X)) plot(pixellate(X, what="n"))
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