In mathematics, a gradually varied surface is a special type of
digital surfaces. It is a function from a 2D digital space (see
digital geometry
Digital geometry deals with discrete sets (usually discrete point sets) considered to be digitized models or images of objects of the 2D or 3D Euclidean space.
Simply put, digitizing is replacing an object by a discrete set of its points. Th ...
) to an ordered set or a chain.
A gradually varied function is a function from a digital space
to
where