```
closing(w, r, ...)
## S3 method for class 'owin':
closing(w, r, \dots, polygonal=NULL)
## S3 method for class 'ppp':
closing(w, r, \dots, polygonal=TRUE)
## S3 method for class 'psp':
closing(w, r, \dots, polygonal=TRUE)
```

w

A window (object of class

`"owin"`

or a line segment pattern (object of class `"psp"`

)
or a point pattern (object of class `"ppp"`

).r

positive number: the radius of the closing.

...

extra arguments passed to

`as.mask`

controlling the pixel resolution, if a pixel approximation is usedpolygonal

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 closed region. If`r=0`

, the result is identical to`w`

.

For a small radius $r$, the closing operation has the effect of smoothing out irregularities in the boundary of $W$. For larger radii, the closing operation smooths out concave features in the boundary. For very large radii, the closed set $W*$ becomes more and more convex.

`opening`

for the opposite operation. `dilation`

, `erosion`

for the basic
operations.
`owin`

,
`as.owin`

for information about windows.

```
data(letterR)
v <- closing(letterR, 0.25, dimyx=256)
plot(v, main="closing")
plot(letterR, add=TRUE)
```

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