%T Discrete-Time Fractional Differentiation from Integer Derivatives 
%A Hany Farid
%R Technical Report TR2004-528
%I Dartmouth College, Computer Science
%C Hanover, NH
%D December 2004
%U http://www.cs.dartmouth.edu/reports/TR2004-528.pdf
%X
 Discrete-time fractional derivative filters (1-D and 2-D) are shown to
 be well approximated from a small set of integer derivatives. A
 fractional derivative of arbitrary order (and, in 2-D, of arbitrary
 orientation) can therefore be efficiently computed from a linear
 combination of integer derivatives of the underlying signal or image.