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/* make a displayable power spectrum for an image
*
* 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
* 7/2/10
* - gtkdoc
* - cleanups
* 3/1/14
* - redone as a class
*/
/*
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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 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 <stdlib.h>
#include <vips/vips.h>
#include "pfreqfilt.h"
typedef VipsFreqfilt VipsSpectrum;
typedef VipsFreqfiltClass VipsSpectrumClass;
G_DEFINE_TYPE( VipsSpectrum, vips_spectrum, VIPS_TYPE_FREQFILT );
static int
vips_spectrum_build( VipsObject *object )
{
VipsFreqfilt *freqfilt = VIPS_FREQFILT( object );
VipsImage **t = (VipsImage **) vips_object_local_array( object, 5 );
VipsImage *in;
if( VIPS_OBJECT_CLASS( vips_spectrum_parent_class )->
build( object ) )
return( -1 );
in = freqfilt->in;
if( in->BandFmt != VIPS_FORMAT_COMPLEX ) {
if( vips_fwfft( in, &t[0], NULL ) )
return( -1 );
in = t[0];
}
if( vips_abs( in, &t[1], NULL ) ||
vips_scale( t[1], &t[2], "log", TRUE, NULL ) ||
vips_wrap( t[2], &t[3], NULL ) )
return( -1 );
if( vips_image_write( t[3], freqfilt->out ) )
return( -1 );
return( 0 );
}
static void
vips_spectrum_class_init( VipsSpectrumClass *class )
{
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
vobject_class->nickname = "spectrum";
vobject_class->description = _( "make displayable power spectrum" );
vobject_class->build = vips_spectrum_build;
}
static void
vips_spectrum_init( VipsSpectrum *spectrum )
{
}
/**
* vips_spectrum:
* @in: input image
* @out: output image
* @...: %NULL-terminated list of optional named arguments
*
* Make a displayable (ie. 8-bit unsigned int) power spectrum.
*
* If @in is non-complex, it is transformed to Fourier space. Then the
* absolute value is passed through vips_scale() in log mode, and vips_wrap().
*
* See also: vips_fwfft(), vips_scale(), vips_wrap().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_spectrum( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "spectrum", ap, in, out );
va_end( ap );
return( result );
}
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