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/* @(#) Functions which takes an initial estimate of deltax, deltay
* @(#) between reference and secondary images (probably from the scanner),
* @(#) and looks in three areas of the overlapping part of the reference image
* @(#) corresponding to reference and secondary. For every other halfreasize
* @(#) point of the three areas of the reference image
* @(#) the contrast is calculated
* @(#) an area 2*halfcorsize+1 centered at this point
* @(#) Results are saved in the structure points
* @(#) The function expects the following valid data in points:
* @(#) deltax, deltay, nopoints, halfcorsize, halfareasize
* @(#) and fills in the memebers:
* @(#) x, y_reference[], contrast and x,y_secondary[],
* @(#) based on deltax and deltay
* @(#) Input image should are either memory mapped or in a buffer.
* @(#) To make the calculation faster set FACTOR to 1, 2 or 3
* @(#) Calculations are based on bandno only.
* @(#) The function uses functions im_calculate_contrast()
* @(#) which is in im_lrcalcon()
* @(#)
* @(#) int im_tbcalcon( ref, sec, bandno, points )
* @(#) IMAGE *ref, *sec;
* @(#) int bandno;
* @(#) TIE_POINTS *points; see mosaic.h
* @(#)
* @(#) 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
* 8/7/93 JC
* - allow IM_CODING_LABQ coding
* - now calls im_incheck()
* 12/7/95 JC
* - reworked
* - what a lot of horrible old code there was too
*/
/*
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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 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 <vips/internal.h>
#include "pmosaicing.h"
int
im__tbcalcon( IMAGE *ref, TIE_POINTS *points )
{
/* Geometry: border we must leave around each area.
*/
const int border = points->halfareasize;
/* Width of an area.
*/
const int awidth = ref->Xsize / AREAS;
/* Number of points we find in each area.
*/
const int len = points->nopoints / AREAS;
int i;
Rect area;
/* Make sure we can read image.
*/
if( im_incheck( ref ) )
return( -1 );
if( ref->Bands != 1 || ref->BandFmt != IM_BANDFMT_UCHAR ) {
im_error( "im__tbcalcon", "%s", _( "help!" ) );
return( -1 );
}
/* Define bits to search for high-contrast areas.
*/
area.width = awidth;
area.height = ref->Ysize;
area.left = 0;
area.top = 0;
im_rect_marginadjust( &area, -border );
area.width--;
area.height--;
if( area.width < 0 || area.height < 0 ) {
im_error( "im__tbcalcon", "%s", _( "overlap too small" ) );
return( -1 );
}
/* Loop over areas, finding points.
*/
for( i = 0; area.left < ref->Xsize; area.left += awidth, i++ )
if( im__find_best_contrast( ref,
area.left, area.top, area.width, area.height,
points->x_reference + i*len,
points->y_reference + i*len,
points->contrast + i*len,
len,
points->halfcorsize ) )
return( -1 );
return( 0 );
}
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