next up previous contents index
Next: fhamming Up: Reference Previous: fftrot   Contents   Index

fftzoom

$ \bigcirc$Name


fftzoom Zoom an image using Fourier interpolation (zero-padding)




$ \bigcirc$Command Synopsis


fftzoom [-z z] [-i] in out



-z z : zoom factor (must be a power of 2), default 2

-i : performs inverse zooming

in : input Fimage

out : output Fimage




$ \bigcirc$Function Summary


void fftzoom (in , out , z , i_flag )

Fimage in , out ;

int *z ;

char *i_flag ;




$ \bigcirc$Description


This module applies a zoom to an image using Fourier interpolation. In the case of a direct zooming, the high frequencies are set to zero (this is the so-called zero-padding method). In the case of an inverse zooming, the high frequencies are simply lost and the low frequencies are unchanged.




$ \bigcirc$See Also


fft2d.




$ \bigcirc$Version 1.2


Last Modification date : Thu Apr 15 00:49:04 2004


$ \bigcirc$Author


Lionel Moisan






next up previous contents index
Next: fhamming Up: Reference Previous: fftrot   Contents   Index
mw 2004-05-05