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/* find percent of pixels
*
* Copyright: 1990, N. Dessipris
*
* Author: N. Dessipris
* Written on: 02/08/1990
* Modified on : 29/4/93 K.Martinez for Sys5
* 20/2/95 JC
* - now returns result through parameter
* - ANSIfied a little
* 19/1/07
* - redone with the vips hist operators
* 25/3/10
* - gtkdoc
* 20/9/13
* - wrap as a class
* - more accurate
*/
/*
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 <string.h>
#include <vips/vips.h>
typedef struct _VipsPercent {
VipsOperation parent_instance;
VipsImage *in;
double percent;
int threshold;
} VipsPercent;
typedef VipsOperationClass VipsPercentClass;
G_DEFINE_TYPE( VipsPercent, vips_percent, VIPS_TYPE_OPERATION );
static int
vips_percent_build( VipsObject *object )
{
VipsPercent *percent = (VipsPercent *) object;
VipsImage **t = (VipsImage **) vips_object_local_array( object, 7 );
double threshold;
if( VIPS_OBJECT_CLASS( vips_percent_parent_class )->
build( object ) )
return( -1 );
if( vips_hist_find( percent->in, &t[0], NULL ) ||
vips_hist_cum( t[0], &t[1], NULL ) ||
vips_hist_norm( t[1], &t[2], NULL ) ||
vips_more_const1( t[2], &t[3],
(percent->percent / 100.0) * t[2]->Xsize, NULL ) ||
vips_profile( t[3], &t[5], &t[6], NULL ) ||
vips_avg( t[6], &threshold, NULL ) )
return( -1 );
g_object_set( object, "threshold", (int) threshold, NULL );
return( 0 );
}
static void
vips_percent_class_init( VipsPercentClass *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 = "percent";
object_class->description = _( "find threshold for percent of pixels" );
object_class->build = vips_percent_build;
VIPS_ARG_IMAGE( class, "in", 1,
_( "Input" ),
_( "Input image" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsPercent, in ) );
VIPS_ARG_DOUBLE( class, "percent", 2,
_( "Percent" ),
_( "Percent of pixels" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsPercent, percent ),
0, 100, 50 );
VIPS_ARG_INT( class, "threshold", 3,
_( "Threshold" ),
_( "Threshold above which lie percent of pixels" ),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET( VipsPercent, threshold ),
0, 65535, 0 );
}
static void
vips_percent_init( VipsPercent *percent )
{
}
/**
* vips_percent:
* @in: input image
* @percent: threshold percentage
* @threshold: output threshold value
* @...: %NULL-terminated list of optional named arguments
*
* vips_percent() returns (through the @threshold parameter) the threshold
* above which there are @percent values of @in. If for example percent=10, the
* number of pels of the input image with values greater than @threshold
* will correspond to 10% of all pels of the image.
*
* The function works for uchar and ushort images only. It can be used
* to threshold the scaled result of a filtering operation.
*
* See also: vips_hist_find(), vips_profile().
*
* Returns: 0 on success, -1 on error
*/
int
vips_percent( VipsImage *in, double percent, int *threshold, ... )
{
va_list ap;
int result;
va_start( ap, threshold );
result = vips_call_split( "percent", ap, in, percent, threshold );
va_end( ap );
return( result );
}
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