Description Usage Arguments Details Value Note Author(s) Examples
Constructs a nonconvex boundary for a point set using morphological operations.
1 2 3 4 5 6 7 8 9 10 | inla.nonconvex.hull(points,
convex = -0.15,
concave = convex,
resolution = 40,
eps = NULL)
inla.nonconvex.hull.basic(points,
convex = -0.15,
resolution = 40,
eps = NULL)
|
points |
2D point coordinates (2-column matrix). |
convex |
The desired extension radius. Also determines the smallest allowed convex curvature radius. Negative values are interpreted as fractions of the approximate initial set diameter. |
concave |
The desired minimal concave curvature radius. Default is
|
resolution |
The internal computation resolution. A warning will be issued when this needs to be increased for higher accuracy, with the required resolution stated. |
eps |
The polygonal curve simplification tolerance used for simplifying the
resulting boundary curve. See |
Morphological dilation by convex
, followed by closing by
concave
, with minimum concave curvature radius concave
.
If the dilated set has no gaps of width between
2*convex*(sqrt(1+2*concave/convex) - 1)
and
2*concave,
then the minimum convex curvature radius is convex
.
Special case concave=0
delegates to
inla.nonconvex.hull.basic
The implementation is based on the identity
dilation(a) & closing(b) = dilation(a+b) & erosion(b)
where all operations are with respect to disks with the specified radii.
An inla.mesh.segment
object.
Requires nndistF
from the splancs
package.
Finn Lindgren finn.lindgren@gmail.com
1 2 3 4 5 6 |
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