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/* creates an ideal filter.
*
* 02/01/14
* - from ideal.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 _VipsMaskIdealBand {
VipsMask parent_instance;
double frequency_cutoff_x;
double frequency_cutoff_y;
double radius;
} VipsMaskIdealBand;
typedef VipsMaskClass VipsMaskIdealBandClass;
G_DEFINE_TYPE(VipsMaskIdealBand, vips_mask_ideal_band,
VIPS_TYPE_MASK);
static double
vips_mask_ideal_band_point(VipsMask *mask, double dx, double dy)
{
VipsMaskIdealBand *ideal_band = (VipsMaskIdealBand *) mask;
double fcx = ideal_band->frequency_cutoff_x;
double fcy = ideal_band->frequency_cutoff_y;
double r2 = ideal_band->radius * ideal_band->radius;
double d1 = (dx - fcx) * (dx - fcx) + (dy - fcy) * (dy - fcy);
double d2 = (dx + fcx) * (dx + fcx) + (dy + fcy) * (dy + fcy);
return (d1 < r2 || d2 < r2) ? 1.0 : 0.0;
}
static void
vips_mask_ideal_band_class_init(VipsMaskIdealBandClass *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_ideal_band";
vobject_class->description = _("make an ideal band filter");
mask_class->point = vips_mask_ideal_band_point;
VIPS_ARG_DOUBLE(class, "frequency_cutoff_x", 6,
_("Frequency cutoff x"),
_("Frequency cutoff x"),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET(VipsMaskIdealBand, frequency_cutoff_x),
0.0, 1000000.0, 0.5);
VIPS_ARG_DOUBLE(class, "frequency_cutoff_y", 7,
_("Frequency cutoff y"),
_("Frequency cutoff y"),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET(VipsMaskIdealBand, frequency_cutoff_y),
0.0, 1000000.0, 0.5);
VIPS_ARG_DOUBLE(class, "radius", 8,
_("Radius"),
_("Radius of circle"),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET(VipsMaskIdealBand, radius),
0.0, 1000000.0, 0.1);
}
static void
vips_mask_ideal_band_init(VipsMaskIdealBand *ideal_band)
{
ideal_band->frequency_cutoff_x = 0.5;
ideal_band->frequency_cutoff_y = 0.5;
ideal_band->radius = 0.1;
}
/**
* vips_mask_ideal_band:
* @out: (out): output image
* @width: image size
* @height: image size
* @frequency_cutoff_x: position of band
* @frequency_cutoff_y: position of band
* @radius: size of band
* @...: `NULL`-terminated list of optional named arguments
*
* Make an ideal band-pass or band-reject filter, that is, one with a
* sharp cutoff around the point @frequency_cutoff_x, @frequency_cutoff_y,
* of size @radius.
*
* ::: tip "Optional arguments"
* * @nodc: `gboolean`, don't set the DC pixel
* * @reject: `gboolean`, invert the filter sense
* * @optical: `gboolean`, coordinates in optical space
* * @uchar: `gboolean`, output a uchar image
*
* ::: seealso
* [ctor@Image.mask_ideal].
*
* Returns: 0 on success, -1 on error
*/
int
vips_mask_ideal_band(VipsImage **out, int width, int height,
double frequency_cutoff_x, double frequency_cutoff_y,
double radius, ...)
{
va_list ap;
int result;
va_start(ap, radius);
result = vips_call_split("mask_ideal_band", ap, out, width, height,
frequency_cutoff_x, frequency_cutoff_y, radius);
va_end(ap);
return result;
}
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