173 lines
4.3 KiB
C
173 lines
4.3 KiB
C
/* frequency-domain filter an image
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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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* 3/1/14
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* - redone as a class
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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 <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <vips/vips.h>
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#include "pfreqfilt.h"
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typedef struct _VipsFreqmult {
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VipsFreqfilt parent_instance;
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VipsImage *mask;
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} VipsFreqmult;
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typedef VipsFreqfiltClass VipsFreqmultClass;
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G_DEFINE_TYPE( VipsFreqmult, vips_freqmult, VIPS_TYPE_FREQFILT );
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static int
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vips_freqmult_build( VipsObject *object )
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{
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VipsFreqfilt *freqfilt = VIPS_FREQFILT( object );
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VipsFreqmult *freqmult = (VipsFreqmult *) object;
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VipsImage **t = (VipsImage **) vips_object_local_array( object, 5 );
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VipsImage *in;
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if( VIPS_OBJECT_CLASS( vips_freqmult_parent_class )->
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build( object ) )
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return( -1 );
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in = freqfilt->in;
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if( vips_band_format_iscomplex( in->BandFmt ) ) {
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if( vips_multiply( in, freqmult->mask, &t[0], NULL ) ||
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vips_invfft( t[0], &t[1], "real", TRUE, NULL ) )
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return( -1 );
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in = t[1];
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}
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else {
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/* Optimisation: output of vips_invfft() is double, we
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* will usually cast to char, so rather than keeping a
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* large double buffer and partial to char from that,
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* cast to a memory buffer and copy to out from that.
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*
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* FIXME does this actually work now we're a class? test
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* perhaps we need a temporary object
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*/
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t[4] = vips_image_new_memory();
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if( vips_fwfft( in, &t[0], NULL ) ||
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vips_multiply( t[0], freqmult->mask, &t[1], NULL ) ||
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vips_invfft( t[1], &t[2], "real", TRUE, NULL ) ||
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vips_cast( t[2], &t[3], in->BandFmt, NULL ) ||
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vips_image_write( t[3], t[4] ) )
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return( -1 );
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in = t[4];
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}
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if( vips_image_write( in, freqfilt->out ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_freqmult_class_init( VipsFreqmultClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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vobject_class->nickname = "freqmult";
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vobject_class->description = _( "frequency-domain filtering" );
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vobject_class->build = vips_freqmult_build;
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VIPS_ARG_IMAGE( class, "mask", 0,
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_( "Mask" ),
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_( "Input mask image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsFreqmult, mask ) );
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}
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static void
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vips_freqmult_init( VipsFreqmult *freqmult )
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{
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}
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/**
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* vips_freqmult: (method)
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* @in: input image
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* @mask: mask image
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* @out: (out): output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Multiply @in by @mask in Fourier space.
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*
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* @in is transformed to Fourier space, multipled with @mask, then
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* transformed back to real space. If @in is already a complex image, just
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* multiply then inverse transform.
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*
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* See also: vips_invfft(), vips_mask_ideal().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_freqmult( VipsImage *in, VipsImage *mask, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "freqmult", ap, in, mask, out );
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va_end( ap );
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return( result );
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}
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