is.convex

Test Whether a Window is Convex

Determines whether a window is convex.

Usage

is.convex(x)

Details

If x is a rectangle, the result is TRUE.

If x is polygonal, the result is TRUE if x consists of a single polygon and this polygon is equal to the minimal convex hull of its vertices computed by chull.

If x is a mask, the algorithm first extracts all boundary pixels of x using vertices. Then it computes the (polygonal) convex hull \(K\) of the boundary pixels. The result is TRUE if every boundary pixel lies within one pixel diameter of an edge of \(K\).

See Also

owin, convexhull.xy, vertices

Aliases

• is.convex