309 lines
6.6 KiB
C
309 lines
6.6 KiB
C
/* Cored sharpen of LABQ image.
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*
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* Usage:
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*
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* int im_sharpen( IMAGE *in, IMAGE *out,
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* int mask_size,
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* int x1, int x2,
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* double m1, double m2 )
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*
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* Returns 0 on success and -1 on error
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*
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* Copyright: 1995 A. Abbood
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* Author: A. Abbood
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* Written on: 30/01/1995
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* 15/5/95 JC
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* - updated for latest 7.3 mods
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* - m3 parameter removed
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* - bug fixes and speed-ups
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* 4/7/95 JC
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* - x3 parameter added
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* - xs are now double
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* 6/7/95 JC
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* - xs are now ys
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* - better LUT generation
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* 12/3/01 JC
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* - uses seperable convolution for umask
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* - tiny clean ups
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* 23/7/01 JC
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* - fix for band extract index changed
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* 21/4/04
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* - switched to gaussian mask and radius
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* 20/11/04
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* - uses extract_bands() to remove and reattach ab for slight speedup
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* - accepts LabS as well as LabQ for slight speedup
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* - small code tidies
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* - ~15% speed up in total
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* 29/11/06
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* - convolve first to help region sharing
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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/* A lut --- we need indexes in the range [-x3,x2], so add x3 to indexes
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* before starting to index table.
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*/
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typedef struct {
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int *lut; /* Start of lut */
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int x1, x2, x3; /* Parameters scaled up to int */
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} SharpenLut;
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/* Make a lut.
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*/
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static SharpenLut *
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build_lut( IMAGE *out, int x1, int x2, int x3, double m1, double m2 )
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{
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int i;
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SharpenLut *slut = IM_NEW( out, SharpenLut );
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if( !slut )
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return( NULL );
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if( !(slut->lut = IM_ARRAY( out, x2 + x3 + 1, int )) )
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return( NULL );
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slut->x1 = x1;
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slut->x2 = x2;
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slut->x3 = x3;
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for( i = 0; i < x1; i++ ) {
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slut->lut[x3 + i] = i*m1;
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slut->lut[x3 - i] = -i*m1;
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}
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for( i = x1; i <= x2; i++ )
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slut->lut[x3 + i] = x1*m1 + (i-x1)*m2;
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for( i = x1; i <= x3; i++ )
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slut->lut[x3 - i] = -(x1*m1 + (i-x1)*m2);
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return( slut );
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}
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/* Take the difference of in1 and in2 and LUT it.
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*/
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static void
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buf_difflut( short **in, short *out, int n, SharpenLut *slut )
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{
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int range = slut->x2 + slut->x3;
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int *lut = slut->lut;
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int x3 = slut->x3;
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short *p1 = in[1];
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short *p2 = in[0];
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int i;
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for( i = 0; i < n; i++ ) {
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int v1 = p1[i];
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int v2 = p2[i];
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/* v2 is the area average. If this is zero, then we pass the
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* original image through unaltered.
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*/
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if( v2 == 0 )
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out[i] = v1;
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else {
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/* Find difference. Offset by x3 to get the expected
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* range of values.
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*/
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int s1 = x3 + (v1 - v2);
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int s2;
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/* Clip to LUT range.
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*/
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if( s1 < 0 )
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s1 = 0;
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else if( s1 > range )
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s1 = range;
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/* Transform!
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*/
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s2 = v1 + lut[s1];
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/* Clip to LabS range.
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*/
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if( s2 < 0 )
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s2 = 0;
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else if( s2 > 32767 )
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s2 = 32767;
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/* And write.
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*/
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out[i] = s2;
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}
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}
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}
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/* Make a 1 line gaussian of a specified radius.
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*/
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static INTMASK *
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sharpen_mask_new( int radius )
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{
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INTMASK *base;
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INTMASK *line;
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int total;
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int i;
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/* Stop at 20% of max ... bit mean, but means mask radius is roughly
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* right.
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*/
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if( !(base = im_gauss_imask( "big1", radius / 2, 0.2 )) )
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return( NULL );
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if( !(line = im_create_imask( "sharpen-line", base->xsize, 1 )) ) {
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im_free_imask( base );
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return( NULL );
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}
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total = 0;
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for( i = 0; i < base->xsize; i++ ) {
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line->coeff[i] =
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base->coeff[base->xsize * (base->ysize / 2) + i];
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total += line->coeff[i];
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}
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line->scale = total;
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im_free_imask( base );
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#ifdef DEBUG
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printf( "sharpen_mask_new: created mask:\n" );
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im_print_imask( line );
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#endif /*DEBUG*/
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return( line );
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}
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int
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im_sharpen( IMAGE *in, IMAGE *out,
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int mask_size,
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double x1, double y2, double y3,
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double m1, double m2 )
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{
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IMAGE *arry[3];
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IMAGE *t[4];
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INTMASK *mask;
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SharpenLut *slut;
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/* Turn y parameters into xs.
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*/
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double x2 = (y2 - x1 * (m1 - m2)) / m2;
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double x3 = (y3 - x1 * (m1 - m2)) / m2;
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if( in->Coding == IM_CODING_LABQ ) {
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IMAGE *tc[2];
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if( im_open_local_array( out, tc, 2, "im_sharpen:1", "p" ) ||
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im_LabQ2LabS( in, tc[0] ) ||
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im_sharpen( tc[0], tc[1],
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mask_size, x1, y2, y3, m1, m2 ) ||
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im_LabS2LabQ( tc[1], out ) )
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return( -1 );
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return( 0 );
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}
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/* Check IMAGE parameters
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*/
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if( in->Coding != IM_CODING_NONE ||
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in->Bands != 3 ||
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in->BandFmt != IM_BANDFMT_SHORT ) {
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im_error( "im_sharpen", _( "input not 3-band short" ) );
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return( -1 );
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}
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if( im_piocheck( in, out ) )
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return( -1 );
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/* Check number range.
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*/
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if( x1 < 0 || x2 < 0 || x1 > 99 || x2 > 99 || x1 > x2 ||
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x3 < 0 || x3 > 99 || x1 > x3 ) {
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im_error( "im_sharpen", _( "parameters out of range" ) );
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return( -1 );
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}
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/* Set up data structures we need. First, the convolution mask we will
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* use.
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*/
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if( !(mask = (INTMASK *) im_local( out,
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(im_construct_fn) sharpen_mask_new,
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(im_callback_fn) im_free_imask,
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GINT_TO_POINTER( mask_size ), NULL, NULL )) )
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return( -1 );
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/* Make the lut we will use. We need to scale up x1, x2, x3 to the
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* LabS range.
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*/
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if( !(slut = build_lut( out,
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x1 * 327.67, x2 * 327.67, x3 * 327.67, m1, m2 )) )
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return( -1 );
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/* Open a set of local image descriptors.
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*/
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if( im_open_local_array( out, t, 4, "im_sharpen:2", "p" ) )
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return( -1 );
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/* Extract L and ab, convolve L.
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*/
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if( im_extract_band( in, t[0], 0 ) ||
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im_extract_bands( in, t[1], 1, 2 ) ||
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im_convsep( t[0], t[2], mask ) )
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return( -1 );
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/* Find difference of L channel and convolved L channel, and pass
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* through LUT.
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*/
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if( im_cp_desc( t[3], t[2] ) )
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return( -1 );
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arry[0] = t[2]; arry[1] = t[0]; arry[2] = NULL;
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if( im_wrapmany( arry, t[3],
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(im_wrapmany_fn) buf_difflut, slut, NULL ) )
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return( -1 );
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/* Reattach ab.
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*/
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if( im_bandjoin( t[3], t[1], out ) )
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return( -1 );
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return( 0 );
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}
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