Description Usage Arguments Details Value Author(s) See Also Examples

Computes the set covariance function of a window.

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`W` |
A window (object of class |

`V` |
Optional. Another window. |

`...` |
Optional arguments passed to |

The set covariance function of a region *W* in the plane
is the function *C(v)* defined for each vector *v*
as the area of the intersection between *W* and *W+v*,
where *W+v* is the set obtained by shifting (translating)
*W* by *v*.

We may interpret *C(v)* as the area of the set of
all points *x* in *W* such that *x+v* also lies in
*W*.

This command computes a discretised approximation to
the set covariance function of any
plane region *W* represented as a window object (of class
`"owin"`

, see `owin.object`

). The return value is
a pixel image (object of class `"im"`

) whose greyscale values
are values of the set covariance function.

The set covariance is computed using the Fast Fourier Transform,
unless `W`

is a rectangle, when an exact formula is used.

If the argument `V`

is present, then `setcov(W,V)`

computes the set *cross-covariance* function *C(x)*
defined for each vector *x*
as the area of the intersection between *W* and *V+x*.

A pixel image (an object of class `"im"`

) representing the
set covariance function of `W`

,
or the cross-covariance of `W`

and `V`

.

and \rolf

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