117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
/* @(#) Calculate dE (CIELAB standard) from two LAB images.
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* @(#)
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* @(#) Usage:
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* @(#) im_dE_fromLab( im1, *im2, im_out )
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* @(#) IMAGE *im1, *im2, *im_out;
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* @(#)
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* @(#) float out.
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* @(#)
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* @(#) Returns: -1 on error, else 0
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* Modified:
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* 16/11/94 JC
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* - partialed!
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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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#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 <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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/* Find the difference between two buffers of LAB data.
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*/
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void
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imb_dE_fromLab( float **p, float *q, int n )
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{
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float *p1 = p[0];
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float *p2 = p[1];
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int x;
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for( x = 0; x < n; x++ ) {
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float L1 = p1[0];
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float a1 = p1[1];
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float b1 = p1[2];
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float L2 = p2[0];
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float a2 = p2[1];
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float b2 = p2[2];
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float dL, da, db;
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p1 += 3;
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p2 += 3;
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dL = L1 - L2;
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da = a1 - a2;
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db = b1 - b2;
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*q++ = sqrt( dL*dL + da*da + db*db );
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}
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}
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int
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im_dE_fromLab( IMAGE *im1, IMAGE *im2, IMAGE *out )
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{
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IMAGE *invec[3];
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/* Check input image.
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*/
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if( im1->Bands != 3 || im1->BandFmt != IM_BANDFMT_FLOAT ||
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im1->Coding != IM_CODING_NONE ||
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im2->Bands != 3 || im2->BandFmt != IM_BANDFMT_FLOAT ||
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im2->Coding != IM_CODING_NONE ) {
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im_errormsg( "im_dE_fromLab: inputs should be 3 band float");
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return( -1 );
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}
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/* Prepare the output image
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*/
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if( im_cp_descv( out, im1, im2, NULL ) )
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return( -1 );
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out->Bbits = IM_BBITS_FLOAT;
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out->Bands = 1;
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out->BandFmt = IM_BANDFMT_FLOAT;
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out->Type = IM_TYPE_B_W;
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/* Do the processing.
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*/
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invec[0] = im1; invec[1] = im2; invec[2] = NULL;
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if( im_wrapmany( invec, out,
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(im_wrapmany_fn) imb_dE_fromLab, NULL, NULL ) )
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return( -1 );
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return( 0 );
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}
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