125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/* @(#) Functions which takes as input a valid image and filters it
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* @(#) in the fourier domain with the filter mask
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* @(#) Input can have any format ; output is the same as input
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* @(#) imin can be char uchar, short, ushort, int, uint, float, double
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* @(#) or complex float; result is the same as input, clipped if necessary.
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* @(#) mask can have any format but the sizes of input and mask are equal
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* @(#) The function performs float fft and if the input is not complex float
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* @(#) the output is casted to the type of input according to im_clip2..()
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* @(#) Since buffer images are involved the size, is restricted to 512x512
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* @(#) for the SUN4 SPARC workstation
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* @(#)
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* @(#) int im_freqflt(imin, mask, imout)
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* @(#) IMAGE *imin, *mask, *imout;
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* @(#)
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* @(#) Returns 0 on success and -1 on error
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*
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* Copyright: 1990, N. Dessipris.
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*
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* Author: Nicos Dessipris
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* Written on: 02/05/1990
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* Modified on : 08/03/1991
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* 16/6/93 J.Cupitt
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* - im_multiply() called, rather than im_cmultim()
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* 27/10/93 JC
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* - im_clip2*() called, rather than im_any2*()
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* 20/9/95 JC
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* - rewritten
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* 10/9/98 JC
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* - frees memory more quickly
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* 4/3/03 JC
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* - use im_invfftr() to get real back for speedup
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <math.h>
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#include <vips/vips.h>
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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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int
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im_freqflt( IMAGE *in, IMAGE *mask, IMAGE *out )
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{
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IMAGE *dummy;
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/* Placeholder for memory free.
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*/
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if( !(dummy = im_open( "memory-1", "p" )) )
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return( -1 );
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if( im_iscomplex( in ) ) {
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/* Easy case! Assume it has already been transformed.
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*/
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IMAGE *t1 = im_open_local( dummy, "im_freqflt-1", "p" );
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if( !t1 ||
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im_multiply( in, mask, t1 ) ||
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im_invfftr( t1, out ) ) {
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im_close( dummy );
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return( -1 );
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}
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}
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else {
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/* Harder - fft first, then mult, then force back to start
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* type.
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*
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* Optimisation: output of im_invfft() is float buffer, we
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* will usually chagetype to char, so rather than keeping a
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* large float buffer and partial to char from that, do
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* changetype to a memory buffer, and copy to out from that.
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*/
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IMAGE *t[3];
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IMAGE *t3;
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if( im_open_local_array( dummy, t, 3, "im_freqflt-1", "p" ) ||
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!(t3 = im_open_local( out, "im_freqflt-3", "t" )) ||
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im_fwfft( in, t[0] ) ||
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im_multiply( t[0], mask, t[1] ) ||
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im_invfftr( t[1], t[2] ) ||
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im_clip2fmt( t[2], t3, in->BandFmt ) ||
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im_copy( t3, out ) ) {
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im_close( dummy );
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return( -1 );
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}
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}
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im_close( dummy );
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return( 0 );
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}
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