A bicubic spline is a special case of bicubic interpolation which uses an interpolation
function of the form
(1)
(2)
(3)
(4)
where
are constants and
and
are parameters ranging from 0 to 1. For a bicubic spline, however, the partial derivatives
at the grid points are determined globally by one-dimensional splines.
are constants and 
and 
are parameters ranging from 0 to 1. For a bicubic spline, however, the partial derivatives
at the grid points are determined globally by one-dimensional splines.
