168 lines
4.3 KiB
C
168 lines
4.3 KiB
C
/* creates an ideal filter.
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*
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* 02/01/14
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* - from ideal.c
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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/*
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#define VIPS_DEBUG
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <vips/vips.h>
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#include "pcreate.h"
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#include "point.h"
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#include "pmask.h"
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typedef struct _VipsMaskIdealBand {
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VipsMask parent_instance;
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double frequency_cutoff_x;
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double frequency_cutoff_y;
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double radius;
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} VipsMaskIdealBand;
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typedef VipsMaskClass VipsMaskIdealBandClass;
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G_DEFINE_TYPE( VipsMaskIdealBand, vips_mask_ideal_band,
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VIPS_TYPE_MASK );
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static double
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vips_mask_ideal_band_point( VipsMask *mask, double dx, double dy )
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{
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VipsMaskIdealBand *ideal_band = (VipsMaskIdealBand *) mask;
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double fcx = ideal_band->frequency_cutoff_x;
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double fcy = ideal_band->frequency_cutoff_y;
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double r2 = ideal_band->radius * ideal_band->radius;
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double d1 = (dx - fcx) * (dx - fcx) + (dy - fcy) * (dy - fcy);
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double d2 = (dx + fcx) * (dx + fcx) + (dy + fcy) * (dy + fcy);
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return( (d1 < r2 || d2 < r2) ? 1.0 : 0.0 );
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}
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static void
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vips_mask_ideal_band_class_init( VipsMaskIdealBandClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
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VipsMaskClass *mask_class = VIPS_MASK_CLASS( class );
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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vobject_class->nickname = "mask_ideal_band";
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vobject_class->description = _( "make an ideal band filter" );
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mask_class->point = vips_mask_ideal_band_point;
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VIPS_ARG_DOUBLE( class, "frequency_cutoff_x", 6,
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_( "Frequency cutoff x" ),
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_( "Frequency cutoff x" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsMaskIdealBand, frequency_cutoff_x ),
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0.0, 1000000.0, 0.5 );
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VIPS_ARG_DOUBLE( class, "frequency_cutoff_y", 7,
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_( "Frequency cutoff y" ),
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_( "Frequency cutoff y" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsMaskIdealBand, frequency_cutoff_y ),
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0.0, 1000000.0, 0.5 );
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VIPS_ARG_DOUBLE( class, "radius", 8,
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_( "Radius" ),
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_( "Radius of circle" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsMaskIdealBand, radius ),
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0.0, 1000000.0, 0.1 );
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}
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static void
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vips_mask_ideal_band_init( VipsMaskIdealBand *ideal_band )
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{
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ideal_band->frequency_cutoff_x = 0.5;
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ideal_band->frequency_cutoff_y = 0.5;
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ideal_band->radius = 0.1;
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}
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/**
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* vips_mask_ideal_band:
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* @out: (out): output image
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* @width: image size
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* @height: image size
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* @frequency_cutoff_x: position of band
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* @frequency_cutoff_y: position of band
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* @radius: size of band
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* @...: %NULL-terminated list of optional named arguments
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*
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* Optional arguments:
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*
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* * @nodc: don't set the DC pixel
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* * @reject: invert the filter sense
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* * @optical: coordinates in optical space
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* * @uchar: output a uchar image
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*
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* Make an ideal band-pass or band-reject filter, that is, one with a
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* sharp cutoff around the point @frequency_cutoff_x, @frequency_cutoff_y,
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* of size @radius.
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*
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* See also: vips_mask_ideal().
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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vips_mask_ideal_band( VipsImage **out, int width, int height,
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double frequency_cutoff_x, double frequency_cutoff_y,
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double radius, ... )
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{
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va_list ap;
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int result;
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va_start( ap, radius );
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result = vips_call_split( "mask_ideal_band", ap, out, width, height,
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frequency_cutoff_x, frequency_cutoff_y, radius );
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va_end( ap );
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return( result );
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}
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