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Determines whether the given window is really a rectangle aligned with the coordinate axes, and if so, converts it to a rectangle object.
rescue.rectangle(W)
A window (object of class "owin"
).
Another object of class "owin"
representing the
same window.
This function decides whether the window W
is actually a rectangle
aligned with the coordinate axes. This will be true if
W
is
a rectangle (window object of type "rectangle"
);
a polygon (window object of type "polygonal"
with a single polygonal boundary) that is a rectangle aligned with
the coordinate axes;
a binary mask (window object of type "mask"
) in which
all the pixel entries are TRUE
.
If so, the function returns
this rectangle, a window object of type "rectangle"
.
If not, the function returns W
.
# NOT RUN {
w <- owin(poly=list(x=c(0,1,1,0),y=c(0,0,1,1)))
rw <- rescue.rectangle(w)
w <- as.mask(unit.square())
rw <- rescue.rectangle(w)
# }
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