im_lhisteq() -> a class
This commit is contained in:
John Cupitt
parent
7a5e04ba00
commit
d78b417c3a
@ -4,7 +4,8 @@
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INTERPRETATION_MATRIX etc.
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- rewrite im_buildlut(), im_identity*(), im_maplut(), im_falsecolour(),
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im_gammacorrect(), im_histgr(), im_histcum(), im_histnorm(), im_heq(),
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im_histnD(), im_histindexed(), im_histspec(), im_invertlut() as classes
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im_histnD(), im_histindexed(), im_histspec(), im_invertlut(), im_lhisteq()
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as classes
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- thin vips8 wrapper for im_histplot()
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- added vips_error_freeze() / vips_error_thaw()
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- used freeze() / thaw() to stop file format sniffers logging spurious errors
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10
TODO
10
TODO
@ -1,3 +1,9 @@
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- is vips_hist_local() correct? it seems to leave white dots everywhere
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- use VipsInterpolate to generate intermediate values in buildlut etc.
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need to pull out columns of input matrix into separate image and expand each
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one
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- use g_log() instead of vips_info()
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@ -13,10 +19,6 @@
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effect what vips does for open-via-disc, and therefore see >100mb ram
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use even in open-via-disc mode
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- why doesn't this work sequentially?
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vips flip Chicago.png x.png horizontal --vips-progress
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- support multiscan jpeg write? see
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https://github.com/jcupitt/ruby-vips/issues/41
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@ -3445,6 +3445,23 @@ im_histgr( IMAGE *in, IMAGE *out, int bandno )
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return( 0 );
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}
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int
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im_lhisteq( VipsImage *in, VipsImage *out, int width, int height )
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{
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VipsImage *x;
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if( vips_hist_local( in, &x, width, height, NULL ) )
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return( -1 );
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if( im_copy( x, out ) ) {
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g_object_unref( x );
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return( -1 );
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}
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g_object_unref( x );
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return( 0 );
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}
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int
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im_histnD( VipsImage *in, VipsImage *out, int bins )
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{
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@ -11,10 +11,10 @@ libhistogram_la_SOURCES = \
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hist_equal.c \
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hist_plot.c \
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hist_match.c \
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hist_local.c \
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\
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hist_dispatch.c \
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im_mpercent.c \
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im_lhisteq.c \
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im_project.c \
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im_stdif.c \
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tone.c
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295
libvips/histogram/hist_local.c
Normal file
295
libvips/histogram/hist_local.c
Normal file
@ -0,0 +1,295 @@
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/* local histogram equalisation
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*
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* Copyright: 1991, N. Dessipris
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*
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* Author: N. Dessipris
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* Written on: 24/10/1991
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* Modified on :
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* 25/1/96 JC
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* - rewritten, adapting im_spcor()
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* - correct result, 2x faster, partial, simpler, better arg checking
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* 8/7/04
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* - expand input rather than output with new im_embed() mode
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* - _raw() output is one pixel larger
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* - sets Xoffset/Yoffset
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* 23/6/08
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* - check for window too small as well
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* 25/3/10
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* - gtkdoc
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* - small cleanups
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* 5/9/13
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* - redo as a class
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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 <stdlib.h>
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#include <string.h>
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#include <vips/vips.h>
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typedef struct _VipsHistLocal {
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VipsOperation parent_instance;
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VipsImage *in;
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VipsImage *out;
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int width;
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int height;
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} VipsHistLocal;
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typedef VipsOperationClass VipsHistLocalClass;
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G_DEFINE_TYPE( VipsHistLocal, vips_hist_local, VIPS_TYPE_OPERATION );
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static int
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vips_hist_local_gen( VipsRegion *or,
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void *seq, void *a, void *b, gboolean *stop )
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{
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VipsRegion *ir = (VipsRegion *) seq;
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const VipsHistLocal *local = (VipsHistLocal *) b;
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VipsRect *r = &or->valid;
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VipsRect irect;
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int y;
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int lsk;
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int centre; /* Offset to move to centre of window */
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/* What part of ir do we need?
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*/
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irect.left = r->left;
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irect.top = r->top;
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irect.width = r->width + local->width;
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irect.height = r->height + local->height;
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if( vips_region_prepare( ir, &irect ) )
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return( -1 );
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lsk = VIPS_REGION_LSKIP( ir );
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centre = lsk * (local->height / 2) + local->width / 2;
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for( y = 0; y < r->height; y++ ) {
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/* Get input and output pointers for this line.
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*/
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VipsPel *p = VIPS_REGION_ADDR( ir, r->left, r->top + y );
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VipsPel *q = VIPS_REGION_ADDR( or, r->left, r->top + y );
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VipsPel *p1;
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int hist[256];
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int x, i, j;
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/* Find histogram for start of this line.
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*/
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memset( hist, 0, 256 * sizeof( int ) );
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p1 = p;
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for( j = 0; j < local->height; j++ ) {
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for( i = 0; i < local->width; i++ )
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hist[p1[i]] += 1;
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p1 += lsk;
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}
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/* Loop for output pels.
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*/
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for( x = 0; x < r->width; x++ ) {
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/* Sum histogram up to current pel.
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*/
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int target = p[centre];
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int sum;
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sum = 0;
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for( i = 0; i < target; i++ )
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sum += hist[i];
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q[x] = 256 * sum / (local->width * local->height);
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/* Adapt histogram --- remove the pels from the left
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* hand column, add in pels for a new right-hand
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* column.
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*/
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p1 = p;
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for( j = 0; j < local->height; j++ ) {
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hist[p1[0]] -= 1;
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hist[p1[local->width]] += 1;
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p1 += lsk;
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}
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p += 1;
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}
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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_hist_local_build( VipsObject *object )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
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VipsHistLocal *local = (VipsHistLocal *) object;
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VipsImage **t = (VipsImage **) vips_object_local_array( object, 3 );
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VipsImage *in;
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if( VIPS_OBJECT_CLASS( vips_hist_local_parent_class )->build( object ) )
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return( -1 );
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in = local->in;
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if( vips_check_mono( class->nickname, in ) ||
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vips_check_uncoded( class->nickname, in ) ||
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vips_check_format( class->nickname, in, VIPS_FORMAT_UCHAR ) )
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return( -1 );
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if( local->width > in->Xsize ||
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local->height > in->Ysize ) {
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vips_error( class->nickname, "%s", _( "window too large" ) );
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return( -1 );
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}
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if( local->width <= 0 ||
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local->height <= 0 ) {
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vips_error( class->nickname, "%s", _( "window too small" ) );
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return( -1 );
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}
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/* Expand the input.
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*/
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if( vips_embed( in, &t[0],
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local->width / 2, local->height / 2,
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in->Xsize + local->width - 1, in->Ysize + local->height - 1,
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"extend", VIPS_EXTEND_COPY,
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NULL ) )
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return( -1 );
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in = t[0];
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g_object_set( object, "out", vips_image_new(), NULL );
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if( vips_image_copy_fields( local->out, in ) )
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return( -1 );
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local->out->Xsize -= local->width - 1;
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local->out->Ysize -= local->height - 1;
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/* Set demand hints. FATSTRIP is good for us, as THINSTRIP will cause
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* too many recalculations on overlaps.
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*/
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vips_demand_hint( local->out,
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VIPS_DEMAND_STYLE_FATSTRIP, in, NULL );
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if( vips_image_generate( local->out,
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vips_start_one, vips_hist_local_gen, vips_stop_one,
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in, local ) )
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return( -1 );
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local->out->Xoffset = 0;
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local->out->Yoffset = 0;
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return( 0 );
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}
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static void
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vips_hist_local_class_init( VipsHistLocalClass *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 = "hist_local";
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object_class->description = _( "local histogram equalisation" );
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object_class->build = vips_hist_local_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( VipsHistLocal, in ) );
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VIPS_ARG_IMAGE( class, "out", 2,
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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( VipsHistLocal, out ) );
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VIPS_ARG_INT( class, "width", 4,
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_( "Width" ),
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_( "Window width in pixels" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsHistLocal, width ),
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1, 1000000, 1 );
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VIPS_ARG_INT( class, "height", 5,
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_( "Height" ),
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_( "Window height in pixels" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsHistLocal, height ),
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1, 1000000, 1 );
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}
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static void
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vips_hist_local_init( VipsHistLocal *local )
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{
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}
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/**
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* vips_hist_local:
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* @in: input image
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* @out: output image
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* @width: width of region
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* @height: height of region
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* @...: %NULL-terminated list of optional named arguments
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*
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* Performs local histogram equalisation on @in using a
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* window of size @xwin by @ywin centered on the input pixel. Works only on
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* monochrome images.
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*
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* The output image is the same size as the input image. The edge pixels are
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* created by copy edge pixels of the input image outwards.
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*
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* See also: vips_hist_equal().
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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_local( VipsImage *in, VipsImage **out, int width, int height, ... )
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{
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va_list ap;
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int result;
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va_start( ap, height );
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result = vips_call_split( "hist_local", ap, in, out, width, height );
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va_end( ap );
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return( result );
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}
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@ -238,6 +238,7 @@ vips_histogram_operation_init( 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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vips_maplut_get_type();
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vips_hist_cum_get_type();
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@ -245,4 +246,5 @@ vips_histogram_operation_init( void )
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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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}
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@ -1,232 +0,0 @@
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/* local histogram equalisation
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*
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* Copyright: 1991, N. Dessipris
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*
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* Author: N. Dessipris
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* Written on: 24/10/1991
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* Modified on :
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* 25/1/96 JC
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* - rewritten, adapting im_spcor()
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* - correct result, 2x faster, partial, simpler, better arg checking
|
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* 8/7/04
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* - expand input rather than output with new im_embed() mode
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* - _raw() output is one pixel larger
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* - sets Xoffset/Yoffset
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* 23/6/08
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* - check for window too small as well
|
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* 25/3/10
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* - gtkdoc
|
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* - small cleanups
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*/
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/*
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|
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This file is part of VIPS.
|
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|
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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
|
||||
|
||||
*/
|
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|
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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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#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 <string.h>
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#include <vips/vips.h>
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/* Hold global stuff here.
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*/
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typedef struct {
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int xwin, ywin; /* Parameters */
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int npels; /* Pels in window */
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} LhistInfo;
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/* lhist generate function.
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*/
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static int
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lhist_gen( REGION *or, void *seq, void *a, void *b )
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{
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REGION *ir = (REGION *) seq;
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LhistInfo *inf = (LhistInfo *) b;
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Rect *r = &or->valid;
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Rect irect;
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int x, y, i, j;
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int lsk;
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int centre; /* Offset to move to centre of window */
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/* What part of ir do we need?
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*/
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irect.left = or->valid.left;
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irect.top = or->valid.top;
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irect.width = or->valid.width + inf->xwin;
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irect.height = or->valid.height + inf->ywin;
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if( im_prepare( ir, &irect ) )
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return( -1 );
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lsk = IM_REGION_LSKIP( ir );
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centre = lsk * (inf->ywin / 2) + inf->xwin / 2;
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for( y = 0; y < r->height; y++ ) {
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/* Get input and output pointers for this line.
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*/
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VipsPel *p = IM_REGION_ADDR( ir, r->left, r->top + y );
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VipsPel *q = IM_REGION_ADDR( or, r->left, r->top + y );
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VipsPel *p1;
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int hist[256];
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/* Find histogram for start of this line.
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*/
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memset( hist, 0, 256 * sizeof( int ) );
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p1 = p;
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for( j = 0; j < inf->ywin; j++ ) {
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for( i = 0; i < inf->xwin; i++ )
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hist[p1[i]] += 1;
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p1 += lsk;
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}
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/* Loop for output pels.
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*/
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for( x = 0; x < r->width; x++ ) {
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/* Sum histogram up to current pel.
|
||||
*/
|
||||
int target = p[centre];
|
||||
int sum;
|
||||
|
||||
sum = 0;
|
||||
for( i = 0; i < target; i++ )
|
||||
sum += hist[i];
|
||||
|
||||
/* Transform.
|
||||
*/
|
||||
q[x] = sum * 256 / inf->npels;
|
||||
|
||||
/* Adapt histogram - remove the pels from the left hand
|
||||
* column, add in pels for a new right-hand column.
|
||||
*/
|
||||
p1 = p;
|
||||
for( j = 0; j < inf->ywin; j++ ) {
|
||||
hist[p1[0]] -= 1;
|
||||
hist[p1[inf->xwin]] += 1;
|
||||
|
||||
p1 += lsk;
|
||||
}
|
||||
|
||||
p += 1;
|
||||
}
|
||||
}
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
int
|
||||
im_lhisteq_raw( IMAGE *in, IMAGE *out, int xwin, int ywin )
|
||||
{
|
||||
LhistInfo *inf;
|
||||
|
||||
if( im_check_mono( "im_lhisteq", in ) ||
|
||||
im_check_uncoded( "im_lhisteq", in ) ||
|
||||
im_check_format( "im_lhisteq", in, IM_BANDFMT_UCHAR ) ||
|
||||
im_piocheck( in, out ) )
|
||||
return( -1 );
|
||||
if( xwin > in->Xsize ||
|
||||
ywin > in->Ysize ) {
|
||||
im_error( "im_lhisteq", "%s", _( "window too large" ) );
|
||||
return( -1 );
|
||||
}
|
||||
if( xwin <= 0 ||
|
||||
ywin <= 0 ) {
|
||||
im_error( "im_lhisteq", "%s", _( "window too small" ) );
|
||||
return( -1 );
|
||||
}
|
||||
|
||||
if( im_cp_desc( out, in ) )
|
||||
return( -1 );
|
||||
out->Xsize -= xwin - 1;
|
||||
out->Ysize -= ywin - 1;
|
||||
|
||||
/* Save parameters.
|
||||
*/
|
||||
if( !(inf = IM_NEW( out, LhistInfo )) )
|
||||
return( -1 );
|
||||
inf->xwin = xwin;
|
||||
inf->ywin = ywin;
|
||||
inf->npels = xwin * ywin;
|
||||
|
||||
/* Set demand hints. FATSTRIP is good for us, as THINSTRIP will cause
|
||||
* too many recalculations on overlaps.
|
||||
*/
|
||||
if( im_demand_hint( out, IM_FATSTRIP, in, NULL ) )
|
||||
return( -1 );
|
||||
|
||||
if( im_generate( out,
|
||||
im_start_one, lhist_gen, im_stop_one, in, inf ) )
|
||||
return( -1 );
|
||||
|
||||
out->Xoffset = -xwin / 2;
|
||||
out->Yoffset = -xwin / 2;
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
|
||||
/**
|
||||
* im_lhisteq:
|
||||
* @in: input image
|
||||
* @out: output image
|
||||
* @xwin: width of region
|
||||
* @ywin: height of region
|
||||
*
|
||||
* Performs local histogram equalisation on @in using a
|
||||
* window of size @xwin by @ywin centered on the input pixel. Works only on
|
||||
* monochrome images.
|
||||
*
|
||||
* The output image is the same size as the input image. The edge pixels are
|
||||
* created by copy edge pixels of the input image outwards.
|
||||
*
|
||||
* See also: im_stdif(), im_heq().
|
||||
*
|
||||
* Returns: 0 on success, -1 on error
|
||||
*/
|
||||
int
|
||||
im_lhisteq( IMAGE *in, IMAGE *out, int xwin, int ywin )
|
||||
{
|
||||
IMAGE *t1;
|
||||
|
||||
if( !(t1 = im_open_local( out, "im_lhisteq:1", "p" )) ||
|
||||
im_embed( in, t1, 1,
|
||||
xwin / 2, ywin / 2,
|
||||
in->Xsize + xwin - 1, in->Ysize + ywin - 1 ) ||
|
||||
im_lhisteq_raw( t1, out, xwin, ywin ) )
|
||||
return( -1 );
|
||||
|
||||
out->Xoffset = 0;
|
||||
out->Yoffset = 0;
|
||||
|
||||
return( 0 );
|
||||
}
|
||||
@ -50,6 +50,9 @@ int vips_hist_plot( VipsImage *in, VipsImage **out, ... )
|
||||
__attribute__((sentinel));
|
||||
int vips_hist_match( VipsImage *in, VipsImage *ref, VipsImage **out, ... )
|
||||
__attribute__((sentinel));
|
||||
int vips_hist_local( VipsImage *in, VipsImage **out,
|
||||
int width, int height, ... )
|
||||
__attribute__((sentinel));
|
||||
|
||||
|
||||
int im_project( VipsImage *in, VipsImage *hout, VipsImage *vout );
|
||||
@ -59,7 +62,6 @@ int im_ismonotonic( VipsImage *lut, int *out );
|
||||
int im_mpercent( VipsImage *in, double percent, int *out );
|
||||
int im_mpercent_hist( VipsImage *hist, double percent, int *out );
|
||||
|
||||
int im_lhisteq( VipsImage *in, VipsImage *out, int xwin, int ywin );
|
||||
int im_stdif( VipsImage *in, VipsImage *out,
|
||||
double a, double m0, double b, double s0, int xwin, int ywin );
|
||||
|
||||
|
||||
@ -863,6 +863,11 @@ int im_hist_indexed( VipsImage *index, VipsImage *value, VipsImage *out );
|
||||
int im_histplot( VipsImage *in, VipsImage *out );
|
||||
int im_hsp( VipsImage *in, VipsImage *ref, VipsImage *out );
|
||||
int im_histspec( VipsImage *in, VipsImage *ref, VipsImage *out );
|
||||
int im_lhisteq( VipsImage *in, VipsImage *out, int xwin, int ywin );
|
||||
|
||||
/* Not really correct, but who uses this.
|
||||
*/
|
||||
#define im_lhisteq_raw im_lhisteq
|
||||
|
||||
/* ruby-vips uses this
|
||||
*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user