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/* Gaussian blur.
*
* 15/11/13
* - from vips_sharpen()
* 19/11/14
* - change parameters to be more imagemagick-like
* 21/9/20
* - allow sigma zero, meaning no blur
* - sigma < 0.2 is just copy
*/
/*
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
*/
/*
#define DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
typedef struct _VipsGaussblur {
VipsOperation parent_instance;
VipsImage *in;
VipsImage *out;
gdouble sigma;
gdouble min_ampl;
VipsPrecision precision;
} VipsGaussblur;
typedef VipsOperationClass VipsGaussblurClass;
G_DEFINE_TYPE( VipsGaussblur, vips_gaussblur, VIPS_TYPE_OPERATION );
static int
vips_gaussblur_build( VipsObject *object )
{
VipsGaussblur *gaussblur = (VipsGaussblur *) object;
VipsImage **t = (VipsImage **) vips_object_local_array( object, 2 );
if( VIPS_OBJECT_CLASS( vips_gaussblur_parent_class )->build( object ) )
return( -1 );
/* vips_gaussmat() will make a 1x1 pixel mask for anything smaller than
* this.
*/
if( gaussblur->sigma < 0.2 ) {
if( vips_copy( gaussblur->in, &t[1], NULL ) )
return( -1 );
}
else {
if( vips_gaussmat( &t[0],
gaussblur->sigma, gaussblur->min_ampl,
"separable", TRUE,
"precision", gaussblur->precision,
NULL ) )
return( -1 );
#ifdef DEBUG
printf( "gaussblur: blurring with:\n" );
vips_matrixprint( t[0], NULL );
#endif /*DEBUG*/
g_info( "gaussblur mask width %d", t[0]->Xsize );
if( vips_convsep( gaussblur->in, &t[1], t[0],
"precision", gaussblur->precision,
NULL ) )
return( -1 );
}
g_object_set( object, "out", vips_image_new(), NULL );
if( vips_image_write( t[1], gaussblur->out ) )
return( -1 );
return( 0 );
}
static void
vips_gaussblur_class_init( VipsGaussblurClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "gaussblur";
object_class->description = _( "gaussian blur" );
object_class->build = vips_gaussblur_build;
operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
VIPS_ARG_IMAGE( class, "in", 1,
_( "Input" ),
_( "Input image" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsGaussblur, in ) );
VIPS_ARG_IMAGE( class, "out", 2,
_( "Output" ),
_( "Output image" ),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET( VipsGaussblur, out ) );
VIPS_ARG_DOUBLE( class, "sigma", 3,
_( "Sigma" ),
_( "Sigma of Gaussian" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsGaussblur, sigma ),
0.0, 1000, 1.5 );
VIPS_ARG_DOUBLE( class, "min_ampl", 3,
_( "Minimum amplitude" ),
_( "Minimum amplitude of Gaussian" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsGaussblur, min_ampl ),
0.001, 1.0, 0.2 );
VIPS_ARG_ENUM( class, "precision", 4,
_( "Precision" ),
_( "Convolve with this precision" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsGaussblur, precision ),
VIPS_TYPE_PRECISION, VIPS_PRECISION_INTEGER );
}
static void
vips_gaussblur_init( VipsGaussblur *gaussblur )
{
gaussblur->sigma = 1.5;
gaussblur->min_ampl = 0.2;
gaussblur->precision = VIPS_PRECISION_INTEGER;
}
/**
* vips_gaussblur: (method)
* @in: input image
* @out: (out): output image
* @sigma: how large a mask to use
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @precision: #VipsPrecision, precision for blur, default int
* * @min_ampl: minimum amplitude, default 0.2
*
* This operator runs vips_gaussmat() and vips_convsep() for you on an image.
* Set @min_ampl smaller to generate a larger, more accurate mask. Set @sigma
* larger to make the blur more blurry.
*
* See also: vips_gaussmat(), vips_convsep().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_gaussblur( VipsImage *in, VipsImage **out, double sigma, ... )
{
va_list ap;
int result;
va_start( ap, sigma );
result = vips_call_split( "gaussblur", ap, in, out, sigma );
va_end( ap );
return( result );
}
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