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fftgrad

$ \bigcirc$Name


fftgrad Compute the gradient of an image using Fourier interpolation




$ \bigcirc$Command Synopsis


fftgrad [-x gradx] [-y grady] [-n gradn] [-p gradp] in



-x gradx : gradient (x coordinate)

-y grady : gradient (y coordinate)

-n gradn : gradient norm |  Du |  

-p gradp : gradient phase (degrees) in [-180,180] U {mw_not_an_argument (=1.0e9)}

in : input Fimage




$ \bigcirc$Function Summary


void fftgrad (in , gradx , grady , gradn , gradp )

Fimage in , gradx , grady , gradn , gradp ;




$ \bigcirc$Description


This module computes the gradient of an image using Fourier interpolation.




$ \bigcirc$See Also


fft2d.




$ \bigcirc$Version 1.1


Last Modification date : Thu Nov 29 20:23:56 2001


$ \bigcirc$Author


Lionel Moisan






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Next: fftrot Up: Reference Previous: fftconvol   Contents   Index
mw 2004-05-05