libvips/libsrc/freq_filt/im_disp_ps.c

108 lines
2.5 KiB
C

/* @(#) Makes a displayable uchar power spectrum of an input one band image
* @(#) Input should be float complex
* @(#) All images are kept in RAM; so only square arrays of powers of
* @(#) 2 as inputs.
* @(#) Functions im_fwfft, im_c2ps, im_scaleps and im_rotquad are used
* @(#) Image descriptors should have been set properly by the calling program
* @(#)
* @(#) int im_disp_ps(in, out)
* @(#) IMAGE *in, *out;
* @(#) int bandno;
* @(#)
* @(#) Returns 0 on sucess and -1 on error
* @(#)
*
* Copyright: 1991, N. Dessipris.
*
* Author: Nicos Dessipris
* Written on: 27/03/1991
* Modified on :
* 16/6/93 J.Cupitt
* - im_ioflag() changed to im_iocheck()
* 23/2/95 JC
* - rewritten for partials
* 10/9/98 JC
* - frees memory more quickly
* 2/4/02 JC
* - any number of bands
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <math.h>
#include <vips/vips.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
static int
disp_ps( IMAGE *dummy, IMAGE *in, IMAGE *out )
{
IMAGE *t[3];
if( im_open_local_array( out, t, 3, "im_disp_ps temp 1", "p" ) )
return( -1 );
if( in->BandFmt == IM_BANDFMT_COMPLEX ) {
if( im_c2ps( in, t[1] ) )
return( -1 );
}
else {
if( im_fwfft( in, t[0] ) || im_c2ps( t[0], t[1] ) )
return( -1 );
}
if( im_scaleps( t[1], t[2] ) || im_rotquad( t[2], out ) )
return( -1 );
return( 0 );
}
int
im_disp_ps( IMAGE *in, IMAGE *out )
{
IMAGE *dummy = im_open( "memory:1", "p" );
if( !dummy )
return( -1 );
if( disp_ps( dummy, in, out ) ) {
im_close( dummy );
return( -1 );
}
im_close( dummy );
return( 0 );
}