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/* Match two normalised, cumulative histograms.
*
* Copyright: 1991, N. Dessipris.
*
* Author: Nicos Dessipris
* Written on: 19/07/1990
* Modified on: 26/03/1991
*
* 1/3/01 JC
* - bleurg! rewritten, now does 16 bits as well, bugs removed, faster,
* smaller
* 24/3/10
* - gtkdoc
* - small cleanups
* 12/8/13
* - redone im_histspec() as a class, vips_hist_match()
* 19/12/13
* - oop, upcast input
*/
/*
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 <glib/gi18n-lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <vips/vips.h>
#include "phistogram.h"
/*
#define DEBUG
*/
typedef struct _VipsHistMatch {
VipsHistogram parent_instance;
VipsImage *in;
VipsImage *ref;
} VipsHistMatch;
typedef VipsHistogramClass VipsHistMatchClass;
G_DEFINE_TYPE( VipsHistMatch, vips_hist_match, VIPS_TYPE_HISTOGRAM );
static void
vips_hist_match_process( VipsHistogram *histogram,
VipsPel *out, VipsPel **in, int width )
{
VipsHistMatch *match = (VipsHistMatch *) histogram;
const int bands = match->in->Bands;
const int max = width * bands;
unsigned int *inbuf = (unsigned int *) in[0];
unsigned int *refbuf = (unsigned int *) in[1];
unsigned int *outbuf = (unsigned int *) out;
int i, j;
for( j = 0; j < bands; j++ ) {
/* Track up refbuf[] with this.
*/
int ri = j;
int limit = max - bands;
for( i = j; i < max; i += bands ) {
unsigned int inv = inbuf[i];
for( ; ri < limit; ri += bands )
if( inv <= refbuf[ri] )
break;
if( ri < limit ) {
/* Simple rounding.
*/
double mid = refbuf[ri] +
refbuf[ri + bands] / 2.0;
if( inv < mid )
outbuf[i] = ri / bands;
else
outbuf[i] = ri / bands + 1;
}
else
outbuf[i] = refbuf[ri];
}
}
}
static int
vips_hist_match_build( VipsObject *object )
{
VipsHistogram *histogram = VIPS_HISTOGRAM( object );
VipsHistMatch *match = (VipsHistMatch *) object;
histogram->n = 2;
histogram->in = (VipsImage **) vips_object_local_array( object, 2 );
histogram->in[0] = match->in;
histogram->in[1] = match->ref;
if( histogram->in[0] )
g_object_ref( histogram->in[0] );
if( histogram->in[1] )
g_object_ref( histogram->in[1] );
if( VIPS_OBJECT_CLASS( vips_hist_match_parent_class )->build( object ) )
return( -1 );
return( 0 );
}
static void
vips_hist_match_class_init( VipsHistMatchClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
VipsHistogramClass *hclass = VIPS_HISTOGRAM_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "hist_match";
vobject_class->description = _( "match two histograms" );
vobject_class->build = vips_hist_match_build;
hclass->input_format = VIPS_FORMAT_UINT;
hclass->process = vips_hist_match_process;
VIPS_ARG_IMAGE( class, "in", 1,
_( "Input" ),
_( "Input histogram" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsHistMatch, in ) );
VIPS_ARG_IMAGE( class, "ref", 2,
_( "Reference" ),
_( "Reference histogram" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsHistMatch, ref ) );
}
static void
vips_hist_match_init( VipsHistMatch *match )
{
}
/**
* vips_hist_match: (method)
* @in: input histogram
* @ref: reference histogram
* @out: (out): output histogram
* @...: %NULL-terminated list of optional named arguments
*
* Adjust @in to match @ref. If @in and @ref are normalised
* cumulative histograms, @out will be a LUT that adjusts the PDF of the image
* from which @in was made to match the PDF of @ref's image.
*
* See also: vips_maplut(), vips_hist_find(), vips_hist_norm(),
* vips_hist_cum().
*
* Returns: 0 on success, -1 on error
*/
int
vips_hist_match( VipsImage *in, VipsImage *ref, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "hist_match", ap, in, ref, out );
va_end( ap );
return( result );
}
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