172 lines
4.2 KiB
C
172 lines
4.2 KiB
C
/* find percent of pixels
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*
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* Copyright: 1990, N. Dessipris
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*
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* Author: N. Dessipris
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* Written on: 02/08/1990
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* Modified on : 29/4/93 K.Martinez for Sys5
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* 20/2/95 JC
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* - now returns result through parameter
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* - ANSIfied a little
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* 19/1/07
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* - redone with the vips hist operators
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* 25/3/10
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* - gtkdoc
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* 20/9/13
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* - wrap as a class
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* - more accurate
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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 <string.h>
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#include <vips/vips.h>
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typedef struct _VipsPercent {
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VipsOperation parent_instance;
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VipsImage *in;
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double percent;
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int threshold;
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} VipsPercent;
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typedef VipsOperationClass VipsPercentClass;
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G_DEFINE_TYPE( VipsPercent, vips_percent, VIPS_TYPE_OPERATION );
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static int
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vips_percent_build( VipsObject *object )
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{
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VipsPercent *percent = (VipsPercent *) object;
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VipsImage **t = (VipsImage **) vips_object_local_array( object, 7 );
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double threshold;
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if( VIPS_OBJECT_CLASS( vips_percent_parent_class )->
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build( object ) )
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return( -1 );
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if( vips_hist_find( percent->in, &t[0], NULL ) ||
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vips_hist_cum( t[0], &t[1], NULL ) ||
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vips_hist_norm( t[1], &t[2], NULL ) ||
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vips_more_const1( t[2], &t[3],
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(percent->percent / 100.0) * t[2]->Xsize, NULL ) ||
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vips_profile( t[3], &t[5], &t[6], NULL ) ||
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vips_avg( t[6], &threshold, NULL ) )
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return( -1 );
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g_object_set( object, "threshold", (int) threshold, NULL );
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return( 0 );
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}
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static void
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vips_percent_class_init( VipsPercentClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) 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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object_class->nickname = "percent";
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object_class->description = _( "find threshold for percent of pixels" );
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object_class->build = vips_percent_build;
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VIPS_ARG_IMAGE( class, "in", 1,
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_( "Input" ),
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_( "Input image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsPercent, in ) );
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VIPS_ARG_DOUBLE( class, "percent", 2,
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_( "Percent" ),
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_( "Percent of pixels" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsPercent, percent ),
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0, 100, 50 );
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VIPS_ARG_INT( class, "threshold", 3,
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_( "Threshold" ),
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_( "Threshold above which lie percent of pixels" ),
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VIPS_ARGUMENT_REQUIRED_OUTPUT,
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G_STRUCT_OFFSET( VipsPercent, threshold ),
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0, 65535, 0 );
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}
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static void
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vips_percent_init( VipsPercent *percent )
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{
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}
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/**
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* vips_percent: (method)
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* @in: input image
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* @percent: threshold percentage
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* @threshold: (out): output threshold value
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* @...: %NULL-terminated list of optional named arguments
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*
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* vips_percent() returns (through the @threshold parameter) the threshold
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* below which there are @percent values of @in. For example:
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*
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* |[
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* $ vips percent k2.jpg 90
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* 214
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* ]|
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*
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* Means that 90% of pixels in `k2.jpg` have a value less than 214.
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*
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* The function works for uchar and ushort images only. It can be used
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* to threshold the scaled result of a filtering operation.
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*
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* See also: vips_hist_find(), vips_profile().
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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_percent( VipsImage *in, double percent, int *threshold, ... )
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{
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va_list ap;
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int result;
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va_start( ap, threshold );
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result = vips_call_split( "percent", ap, in, percent, threshold );
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va_end( ap );
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return( result );
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}
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