138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/* @(#) Functions which takes an initial estimate of deltax, deltay
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* @(#) between reference and secondary images (probably from the scanner),
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* @(#) and looks in three areas of the overlapping part of the reference image
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* @(#) corresponding to reference and secondary. For every other halfreasize
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* @(#) point of the three areas of the reference image
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* @(#) the contrast is calculated
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* @(#) an area 2*halfcorsize+1 centered at this point
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* @(#) Results are saved in the structure points
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* @(#) The function expects the following valid data in points:
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* @(#) deltax, deltay, nopoints, halfcorsize, halfareasize
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* @(#) and fills in the memebers:
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* @(#) x, y_reference[], contrast and x,y_secondary[],
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* @(#) based on deltax and deltay
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* @(#) Input image should are either memory mapped or in a buffer.
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* @(#) To make the calculation faster set FACTOR to 1, 2 or 3
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* @(#) Calculations are based on bandno only.
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* @(#) The function uses functions im_calculate_contrast()
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* @(#) which is in im_lrcalcon()
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* @(#)
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* @(#) int im_tbcalcon( ref, sec, bandno, points )
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* @(#) IMAGE *ref, *sec;
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* @(#) int bandno;
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* @(#) TIE_POINTS *points; see mosaic.h
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* @(#)
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* @(#) Returns 0 on sucess and -1 on error.
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*
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* Copyright: 1990, N. Dessipris.
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*
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* Author: Nicos Dessipris
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* Written on: 20/12/1990
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* Modified on : 18/04/1991
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* 8/7/93 JC
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* - allow IM_CODING_LABQ coding
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* - now calls im_incheck()
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* 12/7/95 JC
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* - reworked
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* - what a lot of horrible old code there was too
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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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#include <vips/internal.h>
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#include "mosaic.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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int
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im__tbcalcon( IMAGE *ref, TIE_POINTS *points )
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{
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/* Geometry: border we must leave around each area.
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*/
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const int border = points->halfareasize;
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/* Width of an area.
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*/
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const int awidth = ref->Xsize / AREAS;
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/* Number of points we find in each area.
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*/
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const int len = points->nopoints / AREAS;
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int i;
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Rect area;
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/* Make sure we can read image.
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*/
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if( im_incheck( ref ) )
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return( -1 );
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if( ref->Bands != 1 || ref->BandFmt != IM_BANDFMT_UCHAR ) {
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im_errormsg( "im__tbcalcon: help!" );
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return( -1 );
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}
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/* Define bits to search for high-contrast areas.
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*/
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area.width = awidth;
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area.height = ref->Ysize;
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area.left = 0;
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area.top = 0;
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im_rect_marginadjust( &area, -border );
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area.width--;
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area.height--;
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if( area.width < 0 || area.height < 0 ) {
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im_errormsg( "im__tbcalcon: overlap too small" );
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return( -1 );
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}
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/* Loop over areas, finding points.
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*/
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for( i = 0; area.left < ref->Xsize; area.left += awidth, i++ )
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if( im__find_best_contrast( ref,
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area.left, area.top, area.width, area.height,
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points->x_reference + i*len,
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points->y_reference + i*len,
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points->contrast + i*len,
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len,
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points->halfcorsize ) )
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return( -1 );
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return( 0 );
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}
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