public interface IterableRegion<T extends BooleanType<T>>
extends IterableInterval<Void>, RandomAccessibleInterval<T>

A region that allows to iterate only the pixels contained in the region (instead of all pixels in bounding box).

Specifically, a region is a RandomAccessibleInterval of some BooleanType having value true for all pixels contained in the region. The interval is a (not necessarily tight) bounding box of the region, i.e., it is assumed that all pixels outside the interval have value false.

Iterating only the pixels contained in the region is indicated by IterableInterval<Void>, i.e., when iterating, only the coordinates that are visited are interesting. There is no associated value.

We put interfaces RandomAccessibleInterval<BooleanType>, extended by IterableRegion<BooleanType>, extended by PositionableIterableRegion<BooleanType> into this sequence such that the Regions methods that "add capabilities" (being iterable, positionable) can have appropriate result types.