183 lines
4.5 KiB
C
183 lines
4.5 KiB
C
/* histogram cumulativisation
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*
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* Author: N. Dessipris
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* Written on: 02/08/1990
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* 24/5/95 JC
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* - tidied up and ANSIfied
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* 20/7/95 JC
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* - smartened up again
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* - now works for hists >256 elements
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* 3/3/01 JC
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* - broken into cum and norm ... helps im_histspec()
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* - better behaviour for >8 bit hists
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* 31/10/05 JC
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* - was broken for vertical histograms, gah
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* - neater im_histnorm()
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* 23/7/07
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* - eek, off by 1 for more than 1 band hists
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* 12/5/08
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* - histcum works for signed hists now as well
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* 24/3/10
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* - gtkdoc
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* - small cleanups
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* 12/8/13
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* - redone im_histcum() as a class, vips_hist_cum()
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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 <vips/intl.h>
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#include <stdio.h>
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#include <vips/vips.h>
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#include "phistogram.h"
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#include "hist_unary.h"
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typedef VipsHistUnary VipsHistCum;
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typedef VipsHistUnaryClass VipsHistCumClass;
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G_DEFINE_TYPE( VipsHistCum, vips_hist_cum, VIPS_TYPE_HIST_UNARY );
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#define ACCUMULATE( ITYPE, OTYPE ) { \
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for( b = 0; b < nb; b++ ) { \
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ITYPE *p = (ITYPE *) in[0]; \
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OTYPE *q = (OTYPE *) out; \
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OTYPE total; \
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\
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total = 0; \
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for( x = b; x < mx; x += nb ) { \
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total += p[x]; \
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q[x] = total; \
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} \
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} \
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}
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static void
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vips_hist_cum_process( VipsHistogram *histogram,
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VipsPel *out, VipsPel **in, int width )
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{
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const int bands = vips_image_get_bands( histogram->ready[0] );
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const int nb =
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vips_band_format_iscomplex( histogram->ready[0]->BandFmt ) ?
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bands * 2 : bands;
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int mx = width * nb;
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int x, b;
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switch( vips_image_get_format( histogram->ready[0] ) ) {
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case VIPS_FORMAT_CHAR:
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ACCUMULATE( signed char, signed int ); break;
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case VIPS_FORMAT_UCHAR:
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ACCUMULATE( unsigned char, unsigned int ); break;
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case VIPS_FORMAT_SHORT:
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ACCUMULATE( signed short, signed int ); break;
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case VIPS_FORMAT_USHORT:
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ACCUMULATE( unsigned short, unsigned int ); break;
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case VIPS_FORMAT_INT:
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ACCUMULATE( signed int, signed int ); break;
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case VIPS_FORMAT_UINT:
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ACCUMULATE( unsigned int, unsigned int ); break;
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case VIPS_FORMAT_FLOAT:
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case VIPS_FORMAT_COMPLEX:
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ACCUMULATE( float, float ); break;
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case VIPS_FORMAT_DOUBLE:
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case VIPS_FORMAT_DPCOMPLEX:
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ACCUMULATE( double, double ); break;
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default:
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g_assert_not_reached();
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}
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}
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/* Save a bit of typing.
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*/
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#define UC VIPS_FORMAT_UCHAR
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#define C VIPS_FORMAT_CHAR
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#define US VIPS_FORMAT_USHORT
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#define S VIPS_FORMAT_SHORT
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#define UI VIPS_FORMAT_UINT
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#define I VIPS_FORMAT_INT
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#define F VIPS_FORMAT_FLOAT
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#define X VIPS_FORMAT_COMPLEX
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#define D VIPS_FORMAT_DOUBLE
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#define DX VIPS_FORMAT_DPCOMPLEX
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static const VipsBandFormat vips_hist_cum_format_table[10] = {
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/* UC C US S UI I F X D DX */
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UI, I, UI, I, UI, I, F, F, D, D
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};
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static void
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vips_hist_cum_class_init( VipsHistCumClass *class )
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{
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsHistogramClass *hclass = VIPS_HISTOGRAM_CLASS( class );
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object_class->nickname = "hist_cum";
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object_class->description = _( "form cumulative histogram" );
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hclass->format_table = vips_hist_cum_format_table;
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hclass->process = vips_hist_cum_process;
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}
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static void
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vips_hist_cum_init( VipsHistCum *hist_cum )
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{
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}
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/**
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* vips_hist_cum: (method)
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* @in: input 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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* Form cumulative histogram.
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*
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* See also: vips_hist_norm().
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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_hist_cum( VipsImage *in, 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( "hist_cum", ap, in, out );
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va_end( ap );
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return( result );
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}
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