162 lines
3.6 KiB
C
162 lines
3.6 KiB
C
/* @(#) Average the bands in an image.
|
|
* @(#)
|
|
* @(#) int
|
|
* @(#) im_bandmean(in, out)
|
|
* @(#) IMAGE *in, *out;
|
|
* @(#)
|
|
* @(#) Returns 0 on success and -1 on error
|
|
*
|
|
* Author: Simon Goodall
|
|
* Written on: 17/7/07
|
|
* 17/7/07 JC
|
|
* - hacked about a bit
|
|
*/
|
|
|
|
/*
|
|
|
|
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 <assert.h>
|
|
|
|
#include <vips/vips.h>
|
|
#include <vips/internal.h>
|
|
|
|
#ifdef WITH_DMALLOC
|
|
#include <dmalloc.h>
|
|
#endif /*WITH_DMALLOC*/
|
|
|
|
/* Int types. Round, keep sum in a larger variable.
|
|
*/
|
|
#define ILOOP( TYPE, STYPE ) { \
|
|
TYPE *p1 = (TYPE *) p; \
|
|
TYPE *q1 = (TYPE *) q; \
|
|
\
|
|
for( i = 0; i < n; i++ ) { \
|
|
STYPE sum; \
|
|
\
|
|
sum = 0; \
|
|
for( j = 0; j < b; j++ ) \
|
|
sum += p1[j]; \
|
|
*q1++ = sum > 0 ? (sum + b / 2) / b : (sum - b / 2) / b; \
|
|
p1 += b; \
|
|
} \
|
|
}
|
|
|
|
/* Float loop. No rounding, sum in same container.
|
|
*/
|
|
#define FLOOP( TYPE ) { \
|
|
TYPE *p1 = (TYPE *) p; \
|
|
TYPE *q1 = (TYPE *) q; \
|
|
\
|
|
for( i = 0; i < n; i++ ) { \
|
|
TYPE sum; \
|
|
\
|
|
sum = 0; \
|
|
for( j = 0; j < b; j++ ) \
|
|
sum += p1[j]; \
|
|
*q1++ = sum / b; \
|
|
p1 += b; \
|
|
} \
|
|
}
|
|
|
|
/* Complex loop. Mean reals and imaginaries separately.
|
|
*/
|
|
#define CLOOP( TYPE ) { \
|
|
TYPE *p1 = (TYPE *) p; \
|
|
TYPE *q1 = (TYPE *) q; \
|
|
\
|
|
for( i = 0; i < n * 2; i += 2 ) { \
|
|
TYPE sum; \
|
|
\
|
|
sum = 0; \
|
|
for( j = 0; j < b; j++ ) \
|
|
sum += p1[j * 2]; \
|
|
q1[0] = sum / b; \
|
|
sum = 0; \
|
|
for( j = 0; j < b; j++ ) \
|
|
sum += p1[j * 2 + 1]; \
|
|
q1[1] = sum / b; \
|
|
p1 += b; \
|
|
q1 += 2; \
|
|
} \
|
|
}
|
|
|
|
static void
|
|
bandmean_buffer( PEL *p, PEL *q, int n, IMAGE *in )
|
|
{
|
|
int i, j;
|
|
const int b = in->Bands;
|
|
|
|
switch( in->BandFmt ) {
|
|
case IM_BANDFMT_CHAR: ILOOP( signed char, int ); break;
|
|
case IM_BANDFMT_UCHAR: ILOOP( unsigned char, unsigned int ); break;
|
|
case IM_BANDFMT_SHORT: ILOOP( signed short, int ); break;
|
|
case IM_BANDFMT_USHORT: ILOOP( unsigned short, unsigned int ); break;
|
|
case IM_BANDFMT_INT: ILOOP( signed int, int ); break;
|
|
case IM_BANDFMT_UINT: ILOOP( unsigned int, unsigned int ); break;
|
|
case IM_BANDFMT_FLOAT: FLOOP( float ); break;
|
|
case IM_BANDFMT_DOUBLE: FLOOP( double ); break;
|
|
case IM_BANDFMT_COMPLEX: CLOOP( float ); break;
|
|
case IM_BANDFMT_DPCOMPLEX: CLOOP( double ); break;
|
|
|
|
default:
|
|
assert( 0 );
|
|
}
|
|
}
|
|
|
|
int
|
|
im_bandmean( IMAGE *in, IMAGE *out )
|
|
{
|
|
/* Check input params
|
|
*/
|
|
if( in->Bands == 1 )
|
|
return( im_copy( in, out ) );
|
|
if( in->Coding != IM_CODING_NONE ) {
|
|
im_error( "im_bandmean", _( "uncoded multiband only" ) );
|
|
return( -1 );
|
|
}
|
|
|
|
/* Prepare output image.
|
|
*/
|
|
if( im_cp_desc( out, in ) )
|
|
return( -1 );
|
|
out->Bands = 1;
|
|
out->Type = IM_TYPE_B_W;
|
|
|
|
/* And process!
|
|
*/
|
|
if( im_wrapone( in, out,
|
|
(im_wrapone_fn) bandmean_buffer, in, NULL ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|