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fix im_addgnoise

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This commit is contained in:
John Cupitt 2008-01-28 21:01:53 +00:00
parent 91dbc7977d
commit b08022e47a
1 changed files with 20 additions and 26 deletions
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48
libsrc/convolution/im_addgnoise.c
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@ -22,6 +22,10 @@
* same job * same job
& 1/5/01 JC & 1/5/01 JC
* - oops, failed for not-1-band images * - oops, failed for not-1-band images
*
* 2008-01-28 tcv:
* - now works (was broken)
* - no limit on bands
*/ */
/* /*
@ -56,41 +60,31 @@
#endif /*HAVE_CONFIG_H*/ #endif /*HAVE_CONFIG_H*/
#include <vips/intl.h> #include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <vips/vips.h> #include <vips/vips.h>
#ifdef WITH_DMALLOC #ifdef WITH_DMALLOC
#include <dmalloc.h> #include <dmalloc.h>
#endif /*WITH_DMALLOC*/ #endif /*WITH_DMALLOC*/
#define MAX_BANDS (200)
int int
im_addgnoise( IMAGE *in, IMAGE *out, double sigma ) im_addgnoise( IMAGE *in, IMAGE *out, double sigma ){
{ #define FUNCTION_NAME "im_addgnoise"
IMAGE *noise[MAX_BANDS];
IMAGE *nb; if( im_piocheck( in, out ))
return -1;
{
int i; int i;
IMAGE **temps= IM_ARRAY( out, in-> Bands, IMAGE* );
IMAGE *joined_temps= im_open_local( out, FUNCTION_NAME ": joined_temps", "p" );
if( in->Bands > MAX_BANDS ) { if( ! temps || ! joined_temps || im_open_local_array( out, temps, in-> Bands, FUNCTION_NAME ": temps", "p" ))
im_error( "im_addgnoise", _( "too many bands" ) ); return -1;
return( -1 );
for( i= 0; i < in-> Bands; ++i )
if( im_gaussnoise( temps[i], in-> Xsize, in-> Ysize, 0.0, sigma ))
return -1;
return im_gbandjoin( temps, joined_temps, in-> Bands ) || im_add( in, joined_temps, out );
} }
#undef FUNCTION_NAME
/* Make n-band noise image.
*/
for( i = 0; i < in->Bands; i++ )
if( !(noise[i] = im_open_local( out, "im_addgnoise:2", "p" )) ||
im_gaussnoise( noise[i], in->Xsize, in->Ysize,
0.0, sigma ) )
return( -1 );
if( !(nb = im_open_local( out, "im_addgnoise:3", "p" )) ||
im_gbandjoin( noise, out, in->Bands ) ||
im_add( in, nb, out ) )
return( -1 );
return( 0 );
} }