| /* @(#) Function which averages the difference x_secondary[] - x_reference[] |
| * @(#) and y_secondary[] - y_reference[] of the structure points; |
| * @(#) The rounded integer result is returnd into dx, dy |
| * @(#) No IMAGES are involved in this function. |
| * @(#) |
| * @(#) int im_avgdxdy( points, dx, dy ) |
| * @(#) TIE_POINTS *points; |
| * @(#) int *dx, *dy; |
| * @(#) |
| * @(#) Returns 0 on sucess and -1 on error. |
| * |
| * Copyright: 1990, N. Dessipris. |
| * |
| * Author: Nicos Dessipris |
| * Written on: 20/12/1990 |
| * Modified on : 18/04/1991 |
| */ |
| |
| /* |
| |
| This file is part of VIPS. |
| |
| 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| */ |
| |
| /* |
| |
| These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk |
| |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include <config.h> |
| #endif /*HAVE_CONFIG_H*/ |
| #include <vips/intl.h> |
| |
| #include <stdio.h> |
| #include <math.h> |
| |
| #include <vips/vips.h> |
| |
| #include "mosaic.h" |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| int |
| im__avgdxdy( TIE_POINTS *points, int *dx, int *dy ) |
| { |
| int sumdx, sumdy; |
| int i; |
| |
| if( points->nopoints == 0 ) { |
| im_error( "im_avgdxdy", "%s", _( "no points to average" ) ); |
| return( -1 ); |
| } |
| |
| /* Lots of points. |
| */ |
| sumdx = 0; |
| sumdy = 0; |
| for( i = 0; i < points->nopoints; i++ ) { |
| sumdx += points->x_secondary[i] - points->x_reference[i]; |
| sumdy += points->y_secondary[i] - points->y_reference[i]; |
| } |
| |
| *dx = IM_RINT( (double) sumdx / (double) points->nopoints ); |
| *dy = IM_RINT( (double) sumdy / (double) points->nopoints ); |
| |
| return( 0 ); |
| } |