160 lines
4.0 KiB
C
160 lines
4.0 KiB
C
/* test for monotonicity
|
|
*
|
|
* Author: John Cupitt
|
|
* Written on: 18/7/1995
|
|
* 17/9/96 JC
|
|
* - restrictions on Ps, Pm, Ph relaxed
|
|
* - restrictions on S, M, H relaxed
|
|
* 25/7/01 JC
|
|
* - patched for im_extract_band() change
|
|
* 11/7/04
|
|
* - generalised to im_tone_build_range() ... so you can use it for any
|
|
* image, not just LabS
|
|
* 26/3/10
|
|
* - cleanups
|
|
* - gtkdoc
|
|
* 20/9/13
|
|
* - 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 <vips/vips.h>
|
|
|
|
typedef struct _VipsHistIsmonotonic {
|
|
VipsOperation parent_instance;
|
|
|
|
VipsImage *in;
|
|
|
|
gboolean monotonic;
|
|
} VipsHistIsmonotonic;
|
|
|
|
typedef VipsOperationClass VipsHistIsmonotonicClass;
|
|
|
|
G_DEFINE_TYPE( VipsHistIsmonotonic, vips_hist_ismonotonic,
|
|
VIPS_TYPE_OPERATION );
|
|
|
|
static int
|
|
vips_hist_ismonotonic_build( VipsObject *object )
|
|
{
|
|
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
|
|
VipsHistIsmonotonic *ismonotonic = (VipsHistIsmonotonic *) object;
|
|
VipsImage **t = (VipsImage **) vips_object_local_array( object, 4 );
|
|
|
|
double m;
|
|
|
|
if( VIPS_OBJECT_CLASS( vips_hist_ismonotonic_parent_class )->
|
|
build( object ) )
|
|
return( -1 );
|
|
|
|
if( vips_check_hist( class->nickname, ismonotonic->in ) )
|
|
return( -1 );
|
|
|
|
if( ismonotonic->in->Xsize == 1 )
|
|
t[0] = vips_image_new_matrixv( 1, 2, -1.0, 1.0 );
|
|
else
|
|
t[0] = vips_image_new_matrixv( 2, 1, -1.0, 1.0 );
|
|
vips_image_set_double( t[0], "offset", 128 );
|
|
|
|
/* We want >=128 everywhere, ie. no -ve transitions.
|
|
*/
|
|
if( vips_conv( ismonotonic->in, &t[1], t[0],
|
|
"precision", VIPS_PRECISION_INTEGER,
|
|
NULL ) ||
|
|
vips_moreeq_const1( t[1], &t[2], 128, NULL ) ||
|
|
vips_min( t[2], &m, NULL ) )
|
|
return( -1 );
|
|
|
|
g_object_set( ismonotonic, "monotonic", (int) m == 255, NULL );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void
|
|
vips_hist_ismonotonic_class_init( VipsHistIsmonotonicClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "hist_ismonotonic";
|
|
object_class->description = _( "test for monotonicity" );
|
|
object_class->build = vips_hist_ismonotonic_build;
|
|
|
|
VIPS_ARG_IMAGE( class, "in", 1,
|
|
_( "Input" ),
|
|
_( "Input histogram image" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsHistIsmonotonic, in ) );
|
|
|
|
VIPS_ARG_BOOL( class, "monotonic", 2,
|
|
_( "Monotonic" ),
|
|
_( "true if in is monotonic" ),
|
|
VIPS_ARGUMENT_REQUIRED_OUTPUT,
|
|
G_STRUCT_OFFSET( VipsHistIsmonotonic, monotonic ),
|
|
FALSE );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_hist_ismonotonic_init( VipsHistIsmonotonic *ismonotonic )
|
|
{
|
|
}
|
|
|
|
/**
|
|
* vips_hist_ismonotonic: (method)
|
|
* @in: lookup-table to test
|
|
* @out: (out): set non-zero if @in is monotonic
|
|
* @...: %NULL-terminated list of optional named arguments
|
|
*
|
|
* Test @in for monotonicity. @out is set non-zero if @in is monotonic.
|
|
*
|
|
* Returns: 0 on success, -1 on error
|
|
*/
|
|
int
|
|
vips_hist_ismonotonic( VipsImage *in, gboolean *out, ... )
|
|
{
|
|
va_list ap;
|
|
int result;
|
|
|
|
va_start( ap, out );
|
|
result = vips_call_split( "hist_ismonotonic", ap, in, out );
|
|
va_end( ap );
|
|
|
|
return( result );
|
|
}
|