| /* im_addgnoise |
| * |
| * Copyright 1990, N. Dessipris. |
| * |
| * File written on 2/12/1986 |
| * Author : N. Dessipris |
| * Updated : 22/01/1991 |
| * 1/2/95 JC |
| * - junked! |
| * - now uses partial im_gaussnoise() and partial im_add() to do the |
| * same job |
| & 1/5/01 JC |
| * - oops, failed for not-1-band images |
| * |
| * 2008-01-28 tcv: |
| * - now works (was broken) |
| * - no limit on bands |
| * 4/2/10 |
| * - no need to bandup here now, im_add() does that |
| * - gtkdoc |
| */ |
| |
| /* |
| |
| 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 <vips/vips.h> |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| /** |
| * im_addgnoise: |
| * @in: input image |
| * @out: output image |
| * @sigma: standard deviation of noise |
| * |
| * Add gaussian noise with mean 0 and variance sigma to @in. |
| * The noise is generated by averaging 12 random numbers, |
| * see page 78, PIETGEN, 1989. |
| * |
| * See also: im_gaussnoise(). |
| * |
| * Returns: 0 on success, -1 on error |
| */ |
| int |
| im_addgnoise( IMAGE *in, IMAGE *out, double sigma ) |
| { |
| IMAGE *t; |
| |
| if( !(t = im_open_local( out, "im_addgnoise", "p" )) || |
| im_gaussnoise( t, in->Xsize, in->Ysize, 0, sigma ) || |
| im_add( in, t, out ) ) |
| return( -1 ); |
| |
| return( 0 ); |
| } |
