267 lines
7.4 KiB
C
267 lines
7.4 KiB
C
/* base class for all histogram operations
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*/
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/*
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Copyright (C) 1991-2005 The National Gallery
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; 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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/*
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#define DEBUG
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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 <stdlib.h>
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#include <math.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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#include "phistogram.h"
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/**
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* SECTION: histogram
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* @short_description: find, manipulate and apply histograms and lookup tables
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* @stability: Stable
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* @see_also: <link linkend="libvips-image">image</link>
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* @include: vips/vips.h
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*
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* Histograms and look-up tables are 1xn or nx1 images, where n is less than
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* 256 or less than 65536, corresponding to 8- and 16-bit unsigned int images.
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* They are
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* tagged with a #VipsType of IM_TYPE_HISTOGRAM and usually displayed by
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* user-interfaces such as nip2 as plots rather than images.
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*
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* These functions can be broadly grouped as things to find or build
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* histograms (im_histgr(), im_buildlut(), in_identity()), operations that
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* manipulate histograms in some way (im_histcum(), im_histnorm()), operations
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* to apply histograms (im_maplut()), and a variety of utility
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* operations.
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*
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* A final group of operations build tone curves. These are useful in
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* pre-press work for adjusting the appearance of images. They are designed
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* for CIELAB images, but might be useful elsewhere.
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*/
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G_DEFINE_ABSTRACT_TYPE( VipsHistogram, vips_histogram, VIPS_TYPE_OPERATION );
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/* sizealike by expanding in just one dimension and copying the final element.
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*/
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static int
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vips__hist_sizealike_vec( VipsImage **in, VipsImage **out, int n )
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{
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int i;
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int max_size;
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g_assert( n >= 1 );
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max_size = VIPS_MAX( in[0]->Xsize, in[0]->Ysize );
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for( i = 1; i < n; i++ )
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max_size = VIPS_MAX( max_size,
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VIPS_MAX( in[0]->Xsize, in[0]->Ysize ) );
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for( i = 0; i < n; i++ )
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if( in[i]->Ysize == 1 ) {
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if( vips_embed( in[i], &out[i], 0, 0, max_size, 1,
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"extend", VIPS_EXTEND_COPY,
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NULL ) )
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return( -1 );
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}
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else {
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if( vips_embed( in[i], &out[i], 0, 0, 1, max_size,
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"extend", VIPS_EXTEND_COPY,
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NULL ) )
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return( -1 );
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}
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return( 0 );
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}
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static int
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vips_histogram_build( VipsObject *object )
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{
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VipsHistogram *histogram = VIPS_HISTOGRAM( object );
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
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VipsHistogramClass *hclass = VIPS_HISTOGRAM_GET_CLASS( histogram );
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VipsImage **format;
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VipsImage **band;
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VipsImage **size;
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VipsPel *outbuf;
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VipsPel **inbuf;
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int i;
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#ifdef DEBUG
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printf( "vips_histogram_build: " );
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vips_object_print_name( object );
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printf( "\n" );
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#endif /*DEBUG*/
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if( VIPS_OBJECT_CLASS( vips_histogram_parent_class )->build( object ) )
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return( -1 );
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g_assert( histogram->n > 0 );
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/* Must be NULL-terminated.
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*/
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g_assert( !histogram->in[histogram->n] );
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format = (VipsImage **) vips_object_local_array( object, histogram->n );
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band = (VipsImage **) vips_object_local_array( object, histogram->n );
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size = (VipsImage **) vips_object_local_array( object, histogram->n );
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g_object_set( histogram, "out", vips_image_new(), NULL );
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for( i = 0; i < histogram->n; i++ )
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if( vips_check_uncoded( class->nickname, histogram->in[i] ) ||
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vips_check_hist( class->nickname, histogram->in[i] ) )
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return( -1 );
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/* Cast our input images up to a common format, bands and size. If
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* input_format is set, cast to a fixed input type.
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*/
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if( hclass->input_format != VIPS_FORMAT_NOTSET ) {
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for( i = 0; i < histogram->n; i++ )
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if( vips_cast( histogram->in[i], &format[i],
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hclass->input_format, NULL ) )
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return( -1 );
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}
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else {
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if( vips__formatalike_vec( histogram->in,
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format, histogram->n ) )
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return( -1 );
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}
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if( vips__bandalike_vec( class->nickname,
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format, band, histogram->n, 1 ) ||
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vips__hist_sizealike_vec( band, size, histogram->n ) )
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return( -1 );
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/* Keep a copy of the processed images here for subclasses.
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*/
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histogram->ready = size;
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if( vips_image_copy_fields_array( histogram->out, histogram->ready ) )
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return( -1 );
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vips_demand_hint_array( histogram->out,
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VIPS_DEMAND_STYLE_THINSTRIP, histogram->ready );
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histogram->out->Xsize = VIPS_IMAGE_N_PELS( histogram->ready[0] );
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histogram->out->Ysize = 1;
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if( hclass->format_table )
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histogram->out->BandFmt =
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hclass->format_table[histogram->ready[0]->BandFmt];
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histogram->out->Type = VIPS_INTERPRETATION_HISTOGRAM;
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if( !(outbuf = vips_malloc( object,
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VIPS_IMAGE_SIZEOF_LINE( histogram->out ))) )
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return( -1 );
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if( !(inbuf = VIPS_ARRAY( object, histogram->n + 1, VipsPel * )) )
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return( -1 );
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for( i = 0; i < histogram->n; i++ ) {
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if( vips_image_wio_input( histogram->ready[i] ) )
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return( -1 );
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inbuf[i] = VIPS_IMAGE_ADDR( histogram->ready[i], 0, 0 );
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}
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inbuf[i] = NULL;
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hclass->process( histogram, outbuf, inbuf, histogram->ready[0]->Xsize );
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if( vips_image_write_line( histogram->out, 0, outbuf ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_histogram_class_init( VipsHistogramClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( 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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vobject_class->nickname = "histogram";
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vobject_class->description = _( "histogram operations" );
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vobject_class->build = vips_histogram_build;
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class->input_format = VIPS_FORMAT_NOTSET;
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/* Inputs set by subclassess.
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*/
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VIPS_ARG_IMAGE( class, "out", 10,
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_( "Output" ),
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_( "Output image" ),
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VIPS_ARGUMENT_REQUIRED_OUTPUT,
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G_STRUCT_OFFSET( VipsHistogram, out ) );
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}
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static void
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vips_histogram_init( VipsHistogram *histogram )
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{
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/* Sanity check this above.
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*/
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histogram->n = -1;
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}
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/* Called from iofuncs to init all operations in this dir. Use a plugin system
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* instead?
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*/
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void
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vips_histogram_operation_init( void )
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{
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extern GType vips_maplut_get_type( void );
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extern GType vips_percent_get_type( void );
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extern GType vips_hist_cum_get_type( void );
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extern GType vips_hist_norm_get_type( void );
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extern GType vips_hist_equal_get_type( void );
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extern GType vips_hist_plot_get_type( void );
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extern GType vips_hist_match_get_type( void );
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extern GType vips_hist_local_get_type( void );
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extern GType vips_hist_ismonotonic_get_type( void );
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extern GType vips_stdif_get_type( void );
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vips_maplut_get_type();
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vips_percent_get_type();
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vips_stdif_get_type();
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vips_hist_cum_get_type();
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vips_hist_norm_get_type();
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vips_hist_equal_get_type();
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vips_hist_plot_get_type();
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vips_hist_match_get_type();
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vips_hist_local_get_type();
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vips_hist_ismonotonic_get_type();
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}
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