102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/* @(#) Program to calculate the stdev of the differnce image
|
|
* @(#) at a given displacement vector
|
|
*
|
|
* Written : 25/11/1987
|
|
* Author : N. Dessipris
|
|
* Updated : 2/12/1991
|
|
* 22/7/93 JC
|
|
* - im_incheck() added
|
|
*/
|
|
|
|
/*
|
|
|
|
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 <stdlib.h>
|
|
#include <math.h>
|
|
|
|
#include <vips/vips.h>
|
|
#include <vips/internal.h>
|
|
|
|
#ifdef WITH_DMALLOC
|
|
#include <dmalloc.h>
|
|
#endif /*WITH_DMALLOC*/
|
|
|
|
int im_dif_std(im, xpos, ypos, xsize, ysize, dx, dy, pmean, pstd)
|
|
IMAGE *im;
|
|
int xpos, ypos, xsize, ysize; /* location of the box within im */
|
|
int dx, dy; /* displacements */
|
|
double *pmean, *pstd;
|
|
{
|
|
PEL *input, *cpinput;
|
|
double m, s;
|
|
int *buf, *pbuf;
|
|
int x, y;
|
|
int ofst, bufsize;
|
|
|
|
|
|
if( im_incheck( im ) )
|
|
return( -1 );
|
|
|
|
if ((im->Bands != 1)||(im->Bbits != IM_BBITS_BYTE)||(im->BandFmt != IM_BANDFMT_UCHAR))
|
|
{im_errormsg("im_dif_std: Unable to accept input"); return(-1);}
|
|
if ( (xpos + xsize + dx > im->Xsize)|| (ypos + ysize + dy > im->Ysize) )
|
|
{ im_errormsg("im_dif_std: wrong args"); return(-1); }
|
|
|
|
bufsize = xsize * ysize;
|
|
buf = (int *)calloc( (unsigned)bufsize, sizeof(int) );
|
|
if ( buf == NULL )
|
|
{ im_errormsg("im_dif_std: calloc failed"); return(-1); }
|
|
input = (PEL*)im->data;
|
|
input += ( ypos * im->Xsize + xpos );
|
|
ofst = dy * im->Xsize + dx;
|
|
pbuf = buf;
|
|
for ( y=0; y<ysize; y++ )
|
|
{
|
|
cpinput = input;
|
|
input += im->Xsize;
|
|
for ( x=0; x<xsize; x++ )
|
|
{
|
|
*pbuf++ = ((int)(*cpinput))-((int)(*(cpinput + ofst)));
|
|
cpinput++;
|
|
}
|
|
}
|
|
|
|
m = 0.0; s = 0.0;
|
|
if( im__mean_std_int_buffer( buf, bufsize, &m, &s ) )
|
|
return(-1);
|
|
*pmean = m;
|
|
*pstd = s;
|
|
free((char*)buf);
|
|
|
|
return(0);
|
|
}
|