156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
/* creates a gaussian_ring filter.
|
|
*
|
|
* 02/01/14
|
|
* - from gaussian_ring.c
|
|
*/
|
|
|
|
/*
|
|
|
|
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 VIPS_DEBUG
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif /*HAVE_CONFIG_H*/
|
|
#include <glib/gi18n-lib.h>
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
|
|
#include <vips/vips.h>
|
|
|
|
#include "pcreate.h"
|
|
#include "point.h"
|
|
#include "pmask.h"
|
|
|
|
typedef struct _VipsMaskGaussianRing {
|
|
VipsMaskGaussian parent_instance;
|
|
|
|
double ringwidth;
|
|
|
|
} VipsMaskGaussianRing;
|
|
|
|
typedef VipsMaskGaussianClass VipsMaskGaussianRingClass;
|
|
|
|
G_DEFINE_TYPE( VipsMaskGaussianRing, vips_mask_gaussian_ring,
|
|
VIPS_TYPE_MASK_GAUSSIAN );
|
|
|
|
static double
|
|
vips_mask_gaussian_ring_point( VipsMask *mask, double dx, double dy )
|
|
{
|
|
VipsMaskGaussian *gaussian = (VipsMaskGaussian *) mask;
|
|
VipsMaskGaussianRing *gaussian_ring =
|
|
(VipsMaskGaussianRing *) mask;
|
|
|
|
double fc = gaussian->frequency_cutoff;
|
|
double ac = gaussian->amplitude_cutoff;
|
|
double ringwidth = gaussian_ring->ringwidth;
|
|
|
|
double df = ringwidth / 2.0;
|
|
double df2 = df * df;
|
|
double cnst = log( ac );
|
|
double dist = sqrt( dx * dx + dy * dy );
|
|
|
|
return( exp( cnst * (dist - fc) * (dist - fc) / df2 ) );
|
|
}
|
|
|
|
static void
|
|
vips_mask_gaussian_ring_class_init( VipsMaskGaussianRingClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
|
|
VipsMaskClass *mask_class = VIPS_MASK_CLASS( class );
|
|
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
vobject_class->nickname = "mask_gaussian_ring";
|
|
vobject_class->description = _( "make a gaussian ring filter" );
|
|
|
|
mask_class->point = vips_mask_gaussian_ring_point;
|
|
|
|
VIPS_ARG_DOUBLE( class, "ringwidth", 20,
|
|
_( "Ringwidth" ),
|
|
_( "Ringwidth" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsMaskGaussianRing, ringwidth ),
|
|
0.0, 1000000.0, 0.5 );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_mask_gaussian_ring_init( VipsMaskGaussianRing *gaussian_ring )
|
|
{
|
|
gaussian_ring->ringwidth = 0.5;
|
|
}
|
|
|
|
/**
|
|
* vips_mask_gaussian_ring:
|
|
* @out: (out): output image
|
|
* @width: image size
|
|
* @height: image size
|
|
* @frequency_cutoff: frequency threshold
|
|
* @amplitude_cutoff: amplitude threshold
|
|
* @ringwidth: ringwidth
|
|
* @...: %NULL-terminated list of optional named arguments
|
|
*
|
|
* Optional arguments:
|
|
*
|
|
* * @nodc: don't set the DC pixel
|
|
* * @reject: invert the filter sense
|
|
* * @optical: coordinates in optical space
|
|
* * @uchar: output a uchar image
|
|
*
|
|
* Make a gaussian ring-pass or ring-reject filter, that is, one with a
|
|
* variable, smooth transition positioned at @frequency_cutoff of width
|
|
* @ringwidth.
|
|
*
|
|
* See also: vips_mask_ideal().
|
|
*
|
|
* Returns: 0 on success, -1 on error
|
|
*/
|
|
int
|
|
vips_mask_gaussian_ring( VipsImage **out, int width, int height,
|
|
double frequency_cutoff, double amplitude_cutoff, double ringwidth,
|
|
... )
|
|
{
|
|
va_list ap;
|
|
int result;
|
|
|
|
va_start( ap, ringwidth );
|
|
result = vips_call_split( "mask_gaussian_ring",
|
|
ap, out, width, height,
|
|
frequency_cutoff, amplitude_cutoff, ringwidth );
|
|
va_end( ap );
|
|
|
|
return( result );
|
|
}
|