1162 lines
39 KiB
C
1162 lines
39 KiB
C
/**************************************************
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* file: nlfilt/nlfilt.c
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*
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* Copyright (c) 1997 Eric L. Hernes (erich@rrnet.com)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Algorithm fixes, V2.0 compatibility by David Hodson hodsond@ozemail.com.au
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*/
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#include "config.h"
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#include <string.h>
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#include <libpika/pika.h>
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#include <libpika/pikaui.h>
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#include "libpika/stdplugins-intl.h"
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#define PLUG_IN_PROC "plug-in-nl-filter"
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#define PLUG_IN_BINARY "nl-filter"
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#define PLUG_IN_ROLE "pika-nl-filter"
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typedef struct
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{
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gdouble alpha;
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gdouble radius;
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gint filter;
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} NLFilterValues;
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typedef enum
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{
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filter_alpha_trim,
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filter_opt_est,
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filter_edge_enhance
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} FilterType;
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typedef struct _Nlfilter Nlfilter;
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typedef struct _NlfilterClass NlfilterClass;
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struct _Nlfilter
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{
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PikaPlugIn parent_instance;
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};
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struct _NlfilterClass
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{
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PikaPlugInClass parent_class;
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};
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#define NLFILTER_TYPE (nlfilter_get_type ())
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#define NLFILTER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), NLFILTER_TYPE, Nlfilter))
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GType nlfilter_get_type (void) G_GNUC_CONST;
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static GList * nlfilter_query_procedures (PikaPlugIn *plug_in);
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static PikaProcedure * nlfilter_create_procedure (PikaPlugIn *plug_in,
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const gchar *name);
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static PikaValueArray * nlfilter_run (PikaProcedure *procedure,
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PikaRunMode run_mode,
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PikaImage *image,
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gint n_drawables,
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PikaDrawable **drawables,
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PikaProcedureConfig *config,
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gpointer run_data);
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static void nlfilter (GObject *config,
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PikaDrawable *drawable,
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PikaPreview *preview);
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static void nlfilter_preview (GtkWidget *widget,
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GObject *config);
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static gboolean nlfilter_dialog (PikaProcedure *procedure,
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GObject *config,
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PikaDrawable *drawable);
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static gint nlfiltInit (gdouble alpha,
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gdouble radius,
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FilterType filter);
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static void nlfiltRow (guchar *srclast,
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guchar *srcthis,
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guchar *srcnext,
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guchar *dst,
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gint width,
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gint bpp,
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gint filtno);
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G_DEFINE_TYPE (Nlfilter, nlfilter, PIKA_TYPE_PLUG_IN)
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PIKA_MAIN (NLFILTER_TYPE)
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DEFINE_STD_SET_I18N
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static void
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nlfilter_class_init (NlfilterClass *klass)
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{
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PikaPlugInClass *plug_in_class = PIKA_PLUG_IN_CLASS (klass);
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plug_in_class->query_procedures = nlfilter_query_procedures;
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plug_in_class->create_procedure = nlfilter_create_procedure;
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plug_in_class->set_i18n = STD_SET_I18N;
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}
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static void
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nlfilter_init (Nlfilter *nlfilter)
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{
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}
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static GList *
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nlfilter_query_procedures (PikaPlugIn *plug_in)
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{
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return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
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}
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static PikaProcedure *
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nlfilter_create_procedure (PikaPlugIn *plug_in,
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const gchar *name)
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{
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PikaProcedure *procedure = NULL;
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if (! strcmp (name, PLUG_IN_PROC))
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{
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procedure = pika_image_procedure_new (plug_in, name,
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PIKA_PDB_PROC_TYPE_PLUGIN,
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nlfilter_run, NULL, NULL);
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pika_procedure_set_image_types (procedure, "RGB, GRAY");
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pika_procedure_set_sensitivity_mask (procedure,
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PIKA_PROCEDURE_SENSITIVE_DRAWABLE);
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pika_procedure_set_menu_label (procedure, _("_NL Filter..."));
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pika_procedure_add_menu_path (procedure,"<Image>/Filters/Enhance");
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pika_procedure_set_documentation (procedure,
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_("Nonlinear swiss army knife filter"),
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_("This is the pnmnlfilt, in PIKA's "
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"clothing. See the pnmnlfilt manpage "
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"for details."),
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name);
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pika_procedure_set_attribution (procedure,
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"Graeme W. Gill, PIKA 0.99 plug-in "
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"by Eric L. Hernes",
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"Graeme W. Gill, Eric L. Hernes",
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"1997");
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PIKA_PROC_ARG_DOUBLE (procedure, "alpha",
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_("_Alpha"),
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_("The amount of the filter to apply"),
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0, 1, 0.3,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "radius",
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_("Ra_dius"),
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_("The filter radius"),
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1.0 / 3.0, 1, 1.0 / 3.0,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_INT (procedure, "filter",
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_("Filter"),
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_("The Filter to Run, "
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"0 - alpha trimmed mean; "
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"1 - optimal estimation "
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"(alpha controls noise variance); "
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"2 - edge enhancement"),
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0, 2, 0,
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G_PARAM_READWRITE);
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}
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return procedure;
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}
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static PikaValueArray *
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nlfilter_run (PikaProcedure *procedure,
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PikaRunMode run_mode,
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PikaImage *image,
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gint n_drawables,
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PikaDrawable **drawables,
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PikaProcedureConfig *config,
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gpointer run_data)
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{
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PikaDrawable *drawable;
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gegl_init (NULL, NULL);
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if (n_drawables != 1)
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{
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GError *error = NULL;
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g_set_error (&error, PIKA_PLUG_IN_ERROR, 0,
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_("Procedure '%s' only works with one drawable."),
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pika_procedure_get_name (procedure));
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return pika_procedure_new_return_values (procedure,
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PIKA_PDB_CALLING_ERROR,
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error);
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}
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else
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{
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drawable = drawables[0];
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}
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if (run_mode == PIKA_RUN_INTERACTIVE && ! nlfilter_dialog (procedure, G_OBJECT (config), drawable))
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return pika_procedure_new_return_values (procedure,
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PIKA_PDB_CANCEL,
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NULL);
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nlfilter (G_OBJECT (config), drawable, NULL);
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if (run_mode != PIKA_RUN_NONINTERACTIVE)
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pika_displays_flush ();
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return pika_procedure_new_return_values (procedure, PIKA_PDB_SUCCESS, NULL);
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}
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/* pnmnlfilt.c - 4 in 1 (2 non-linear) filter
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** - smooth an anyimage
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** - do alpha trimmed mean filtering on an anyimage
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** - do optimal estimation smoothing on an anyimage
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** - do edge enhancement on an anyimage
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**
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** Version 1.0
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**
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** The implementation of an alpha-trimmed mean filter
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** is based on the description in IEEE CG&A May 1990
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** Page 23 by Mark E. Lee and Richard A. Redner.
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**
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** The paper recommends using a hexagon sampling region around each
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** pixel being processed, allowing an effective sub pixel radius to be
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** specified. The hexagon values are sythesised by area sampling the
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** rectangular pixels with a hexagon grid. The seven hexagon values
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** obtained from the 3x3 pixel grid are used to compute the alpha
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** trimmed mean. Note that an alpha value of 0.0 gives a conventional
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** mean filter (where the radius controls the contribution of
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** surrounding pixels), while a value of 0.5 gives a median filter.
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** Although there are only seven values to trim from before finding
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** the mean, the algorithm has been extended from that described in
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** CG&A by using interpolation, to allow a continuous selection of
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** alpha value between and including 0.0 to 0.5 The useful values
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** for radius are between 0.3333333 (where the filter will have no
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** effect because only one pixel is sampled), to 1.0, where all
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** pixels in the 3x3 grid are sampled.
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**
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** The optimal estimation filter is taken from an article "Converting Dithered
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** Images Back to Gray Scale" by Allen Stenger, Dr Dobb's Journal, November
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** 1992, and this article references "Digital Image Enhancement andNoise Filtering by
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** Use of Local Statistics", Jong-Sen Lee, IEEE Transactions on Pattern Analysis and
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** Machine Intelligence, March 1980.
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**
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** Also borrow the technique used in pgmenhance(1) to allow edge
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** enhancement if the alpha value is negative.
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**
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** Author:
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** Graeme W. Gill, 30th Jan 1993
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** graeme@labtam.oz.au
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**
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** Permission is hereby granted, to use, copy, modify, distribute,
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** and sell this software and its associated documentation files
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** (the "Software") for any purpose without fee, provided
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** that:
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**
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** 1) The above copyright notices and this permission notice
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** accompany all source code copies of the Software and
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** related documentation.
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** and
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**
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** 2) If executable code based on the Software only is distributed,
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** then the accompanying documentation must acknowledge that
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** "this software is based in part on the work of Graeme W. Gill".
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** and
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**
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** 3) It is accepted that Graeme W. Gill (the "Author") accepts
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** NO LIABILITY for damages of any kind. The Software is
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** provided without fee by the Author "AS-IS" and without
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** warranty of any kind, express, implied or otherwise,
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** including without limitation, any warranty of merchantability
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** or fitness for a particular purpose.
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** and
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**
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** 4) These conditions apply to any software derived from or based
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** on the Software, not just to the unmodified library.
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**
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*/
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/* ************************************************** */
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/* Hexagon intersecting square area functions */
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/* Compute the area of the intersection of a triangle */
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/* and a rectangle */
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static gdouble triang_area(gdouble, gdouble, gdouble, gdouble, gdouble,
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gdouble, gdouble, gdouble, gint);
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static gdouble rectang_area(gdouble, gdouble, gdouble, gdouble,
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gdouble, gdouble, gdouble, gdouble);
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static gdouble hex_area(gdouble, gdouble, gdouble, gdouble, gdouble);
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static gint atfilt0 (gint *p);
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static gint atfilt1 (gint *p);
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static gint atfilt2 (gint *p);
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static gint atfilt3 (gint *p);
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static gint atfilt4 (gint *p);
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static gint atfilt5 (gint *p);
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gint (*atfuncs[6])(gint *) =
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{
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atfilt0,
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atfilt1,
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atfilt2,
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atfilt3,
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atfilt4,
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atfilt5
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};
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static gint noisevariance;
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#define MXIVAL 255 /* maximum input value */
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#define NOIVAL (MXIVAL + 1) /* number of possible input values */
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#define SCALEB 8 /* scale bits */
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#define SCALE (1 << SCALEB) /* scale factor */
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#define CSCALEB 2 /* coarse scale bits */
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#define CSCALE (1 << CSCALEB) /* coarse scale factor */
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#define MXCSVAL (MXIVAL * CSCALE) /* maximum coarse scaled values */
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#define NOCSVAL (MXCSVAL + 1) /* number of coarse scaled values */
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#define SCTOCSC(x) ((x) >> (SCALEB - CSCALEB)) /* convert from scaled to coarse scaled */
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#define CSCTOSC(x) ((x) << (SCALEB - CSCALEB)) /* convert from course scaled to scaled */
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/* round and scale floating point to scaled integer */
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#define SROUND(x) ((gint)(((x) * (gdouble)SCALE) + 0.5))
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/* round and un-scale scaled integer value */
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#define RUNSCALE(x) (((x) + (1 << (SCALEB-1))) >> SCALEB) /* rounded un-scale */
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#define UNSCALE(x) ((x) >> SCALEB)
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/* Note: modified by David Hodson, nlfiltRow now accesses
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* srclast, srcthis, and srcnext from [-bpp] to [width*bpp-1].
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* Beware if you use this code anywhere else!
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*/
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static void
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nlfiltRow (guchar *srclast, guchar *srcthis, guchar *srcnext, guchar *dst,
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gint width, gint bpp, gint filtno)
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{
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gint pf[9];
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guchar *ip0, *ip1, *ip2, *or, *orend;
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orend = dst + width * bpp;
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ip0 = srclast;
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ip1 = srcthis;
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ip2 = srcnext;
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for (or = dst; or < orend; ip0++, ip1++, ip2++, or++)
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{
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pf[0] = *ip1;
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pf[1] = *(ip1 - bpp);
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pf[2] = *(ip2 - bpp);
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pf[3] = *(ip2);
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pf[4] = *(ip2 + bpp);
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pf[5] = *(ip1 + bpp);
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pf[6] = *(ip0 + bpp);
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pf[7] = *(ip0);
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pf[8] = *(ip0 - bpp);
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*or=(atfuncs[filtno])(pf);
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}
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}
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/* We restrict radius to the values: 0.333333 <= radius <= 1.0 */
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/* so that no fewer and no more than a 3x3 grid of pixels around */
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/* the pixel in question needs to be read. Given this, we only */
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/* need 3 or 4 weightings per hexagon, as follows: */
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/* _ _ */
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/* Vertical hex: |_|_| 1 2 */
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/* |X|_| 0 3 */
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/* _ */
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/* _ _|_| 1 */
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/* Middle hex: |_| 1 Horizontal hex: |X|_| 0 2 */
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/* |X| 0 |_| 3 */
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/* |_| 2 */
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/* all filters */
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gint V0[NOIVAL],V1[NOIVAL],V2[NOIVAL],V3[NOIVAL]; /* vertical hex */
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gint M0[NOIVAL],M1[NOIVAL],M2[NOIVAL]; /* middle hex */
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gint H0[NOIVAL],H1[NOIVAL],H2[NOIVAL],H3[NOIVAL]; /* horizontal hex */
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/* alpha trimmed and edge enhancement only */
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gint ALFRAC[NOIVAL * 8]; /* fractional alpha divider table */
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/* optimal estimation only */
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gint AVEDIV[7 * NOCSVAL]; /* divide by 7 to give average value */
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gint SQUARE[2 * NOCSVAL]; /* scaled square lookup table */
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/* Table initialisation function - return alpha range */
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static gint
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nlfiltInit (gdouble alpha, gdouble radius, FilterType filter)
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{
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gint alpharange; /* alpha range value 0 - 3 */
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gdouble meanscale; /* scale for finding mean */
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gdouble mmeanscale; /* scale for finding mean - midle hex */
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gdouble alphafraction; /* fraction of next largest/smallest
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* to subtract from sum
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*/
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switch (filter)
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{
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case filter_alpha_trim:
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{
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gdouble noinmean;
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/* alpha only makes sense in range 0.0 - 0.5 */
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alpha /= 2.0;
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/* number of elements (out of a possible 7) used in the mean */
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noinmean = ((0.5 - alpha) * 12.0) + 1.0;
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mmeanscale = meanscale = 1.0/noinmean;
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if (alpha == 0.0) { /* mean filter */
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alpharange = 0;
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alphafraction = 0.0; /* not used */
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} else if (alpha < (1.0/6.0)) { /* mean of 5 to 7 middle values */
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alpharange = 1;
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alphafraction = (7.0 - noinmean)/2.0;
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} else if (alpha < (1.0/3.0)) { /* mean of 3 to 5 middle values */
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alpharange = 2;
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alphafraction = (5.0 - noinmean)/2.0;
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} else { /* mean of 1 to 3 middle values */
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/* alpha==0.5 => median filter */
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alpharange = 3;
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alphafraction = (3.0 - noinmean)/2.0;
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}
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}
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break;
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case filter_opt_est: {
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gint i;
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gdouble noinmean = 7.0;
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/* edge enhancement function */
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alpharange = 5;
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/* compute scaled hex values */
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mmeanscale=meanscale=1.0;
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/* Set up 1:1 division lookup - not used */
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alphafraction=1.0/noinmean;
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/* estimate of noise variance */
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noisevariance = alpha * (gdouble)255;
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noisevariance = noisevariance * noisevariance / 8.0;
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/* set yp optimal estimation specific stuff */
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for (i=0;i<(7*NOCSVAL);i++) { /* divide scaled value by 7 lookup */
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AVEDIV[i] = CSCTOSC(i)/7; /* scaled divide by 7 */
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}
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/* compute square and rescale by
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* (val >> (2 * SCALEB + 2)) table
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*/
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for (i=0;i<(2*NOCSVAL);i++) {
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gint val;
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/* NOCSVAL offset to cope with -ve input values */
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val = CSCTOSC(i - NOCSVAL);
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SQUARE[i] = (val * val) >> (2 * SCALEB + 2);
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}
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}
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break;
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case filter_edge_enhance: {
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if (alpha == 1.0) alpha = 0.99;
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alpharange = 4;
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/* mean of 7 and scaled by -alpha/(1-alpha) */
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meanscale = 1.0 * (-alpha/((1.0 - alpha) * 7.0));
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/* middle pixel has 1/(1-alpha) as well */
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mmeanscale = 1.0 * (1.0/(1.0 - alpha) + meanscale);
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alphafraction = 0.0; /* not used */
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}
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break;
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default:
|
|
g_printerr ("unknown filter %d\n", filter);
|
|
return -1;
|
|
}
|
|
/*
|
|
* Setup pixel weighting tables -
|
|
* note we pre-compute mean division here too.
|
|
*/
|
|
{
|
|
gint i;
|
|
gdouble hexhoff,hexvoff;
|
|
gdouble tabscale,mtabscale;
|
|
gdouble v0,v1,v2,v3,m0,m1,m2,h0,h1,h2,h3;
|
|
|
|
/* horizontal offset of vertical hex centers */
|
|
hexhoff = radius/2;
|
|
|
|
/* vertical offset of vertical hex centers */
|
|
hexvoff = 3.0 * radius/sqrt(12.0);
|
|
|
|
/*
|
|
* scale tables to normalise by hexagon
|
|
* area, and number of hexes used in mean
|
|
*/
|
|
tabscale = meanscale / (radius * hexvoff);
|
|
mtabscale = mmeanscale / (radius * hexvoff);
|
|
v0 = hex_area(0.0,0.0,hexhoff,hexvoff,radius) * tabscale;
|
|
v1 = hex_area(0.0,1.0,hexhoff,hexvoff,radius) * tabscale;
|
|
v2 = hex_area(1.0,1.0,hexhoff,hexvoff,radius) * tabscale;
|
|
v3 = hex_area(1.0,0.0,hexhoff,hexvoff,radius) * tabscale;
|
|
m0 = hex_area(0.0,0.0,0.0,0.0,radius) * mtabscale;
|
|
m1 = hex_area(0.0,1.0,0.0,0.0,radius) * mtabscale;
|
|
m2 = hex_area(0.0,-1.0,0.0,0.0,radius) * mtabscale;
|
|
h0 = hex_area(0.0,0.0,radius,0.0,radius) * tabscale;
|
|
h1 = hex_area(1.0,1.0,radius,0.0,radius) * tabscale;
|
|
h2 = hex_area(1.0,0.0,radius,0.0,radius) * tabscale;
|
|
h3 = hex_area(1.0,-1.0,radius,0.0,radius) * tabscale;
|
|
|
|
for (i=0; i <= MXIVAL; i++) {
|
|
gdouble fi;
|
|
fi = (gdouble)i;
|
|
V0[i] = SROUND(fi * v0);
|
|
V1[i] = SROUND(fi * v1);
|
|
V2[i] = SROUND(fi * v2);
|
|
V3[i] = SROUND(fi * v3);
|
|
M0[i] = SROUND(fi * m0);
|
|
M1[i] = SROUND(fi * m1);
|
|
M2[i] = SROUND(fi * m2);
|
|
H0[i] = SROUND(fi * h0);
|
|
H1[i] = SROUND(fi * h1);
|
|
H2[i] = SROUND(fi * h2);
|
|
H3[i] = SROUND(fi * h3);
|
|
}
|
|
/* set up alpha fraction lookup table used on big/small */
|
|
for (i=0; i < (NOIVAL * 8); i++) {
|
|
ALFRAC[i] = SROUND((gdouble)i * alphafraction);
|
|
}
|
|
}
|
|
return alpharange;
|
|
}
|
|
|
|
/* Core pixel processing function - hand it 3x3 pixels and return result. */
|
|
/* Mean filter */
|
|
static gint
|
|
atfilt0(gint32 *p)
|
|
{
|
|
gint retv;
|
|
/* map to scaled hexagon values */
|
|
retv = M0[p[0]] + M1[p[3]] + M2[p[7]];
|
|
retv += H0[p[0]] + H1[p[2]] + H2[p[1]] + H3[p[8]];
|
|
retv += V0[p[0]] + V1[p[3]] + V2[p[2]] + V3[p[1]];
|
|
retv += V0[p[0]] + V1[p[3]] + V2[p[4]] + V3[p[5]];
|
|
retv += H0[p[0]] + H1[p[4]] + H2[p[5]] + H3[p[6]];
|
|
retv += V0[p[0]] + V1[p[7]] + V2[p[6]] + V3[p[5]];
|
|
retv += V0[p[0]] + V1[p[7]] + V2[p[8]] + V3[p[1]];
|
|
return UNSCALE(retv);
|
|
}
|
|
|
|
/* Mean of 5 - 7 middle values */
|
|
static gint
|
|
atfilt1 (gint32 *p)
|
|
{
|
|
gint h0,h1,h2,h3,h4,h5,h6; /* hexagon values 2 3 */
|
|
/* 1 0 4 */
|
|
/* 6 5 */
|
|
gint big,small;
|
|
/* map to scaled hexagon values */
|
|
h0 = M0[p[0]] + M1[p[3]] + M2[p[7]];
|
|
h1 = H0[p[0]] + H1[p[2]] + H2[p[1]] + H3[p[8]];
|
|
h2 = V0[p[0]] + V1[p[3]] + V2[p[2]] + V3[p[1]];
|
|
h3 = V0[p[0]] + V1[p[3]] + V2[p[4]] + V3[p[5]];
|
|
h4 = H0[p[0]] + H1[p[4]] + H2[p[5]] + H3[p[6]];
|
|
h5 = V0[p[0]] + V1[p[7]] + V2[p[6]] + V3[p[5]];
|
|
h6 = V0[p[0]] + V1[p[7]] + V2[p[8]] + V3[p[1]];
|
|
/* sum values and also discover the largest and smallest */
|
|
big = small = h0;
|
|
#define CHECK(xx) \
|
|
h0 += xx; \
|
|
if (xx > big) \
|
|
big = xx; \
|
|
else if (xx < small) \
|
|
small = xx;
|
|
CHECK(h1)
|
|
CHECK(h2)
|
|
CHECK(h3)
|
|
CHECK(h4)
|
|
CHECK(h5)
|
|
CHECK(h6)
|
|
#undef CHECK
|
|
/* Compute mean of middle 5-7 values */
|
|
return UNSCALE(h0 -ALFRAC[(big + small)>>SCALEB]);
|
|
}
|
|
|
|
/* Mean of 3 - 5 middle values */
|
|
static gint
|
|
atfilt2 (gint32 *p)
|
|
{
|
|
gint h0,h1,h2,h3,h4,h5,h6; /* hexagon values 2 3 */
|
|
/* 1 0 4 */
|
|
/* 6 5 */
|
|
gint big0,big1,small0,small1;
|
|
/* map to scaled hexagon values */
|
|
h0 = M0[p[0]] + M1[p[3]] + M2[p[7]];
|
|
h1 = H0[p[0]] + H1[p[2]] + H2[p[1]] + H3[p[8]];
|
|
h2 = V0[p[0]] + V1[p[3]] + V2[p[2]] + V3[p[1]];
|
|
h3 = V0[p[0]] + V1[p[3]] + V2[p[4]] + V3[p[5]];
|
|
h4 = H0[p[0]] + H1[p[4]] + H2[p[5]] + H3[p[6]];
|
|
h5 = V0[p[0]] + V1[p[7]] + V2[p[6]] + V3[p[5]];
|
|
h6 = V0[p[0]] + V1[p[7]] + V2[p[8]] + V3[p[1]];
|
|
/* sum values and also discover the 2 largest and 2 smallest */
|
|
big0 = small0 = h0;
|
|
small1 = G_MAXINT;
|
|
big1 = 0;
|
|
#define CHECK(xx) \
|
|
h0 += xx; \
|
|
if (xx > big1) \
|
|
{ \
|
|
if (xx > big0) \
|
|
{ \
|
|
big1 = big0; \
|
|
big0 = xx; \
|
|
} \
|
|
else \
|
|
big1 = xx; \
|
|
} \
|
|
if (xx < small1) \
|
|
{ \
|
|
if (xx < small0) \
|
|
{ \
|
|
small1 = small0; \
|
|
small0 = xx; \
|
|
} \
|
|
else \
|
|
small1 = xx; \
|
|
}
|
|
CHECK(h1)
|
|
CHECK(h2)
|
|
CHECK(h3)
|
|
CHECK(h4)
|
|
CHECK(h5)
|
|
CHECK(h6)
|
|
#undef CHECK
|
|
/* Compute mean of middle 3-5 values */
|
|
return UNSCALE(h0 -big0 -small0 -ALFRAC[(big1 + small1)>>SCALEB]);
|
|
}
|
|
|
|
/*
|
|
* Mean of 1 - 3 middle values.
|
|
* If only 1 value, then this is a median filter.
|
|
*/
|
|
static gint32
|
|
atfilt3(gint32 *p)
|
|
{
|
|
gint h0,h1,h2,h3,h4,h5,h6; /* hexagon values 2 3 */
|
|
/* 1 0 4 */
|
|
/* 6 5 */
|
|
gint big0,big1,big2,small0,small1,small2;
|
|
/* map to scaled hexagon values */
|
|
h0 = M0[p[0]] + M1[p[3]] + M2[p[7]];
|
|
h1 = H0[p[0]] + H1[p[2]] + H2[p[1]] + H3[p[8]];
|
|
h2 = V0[p[0]] + V1[p[3]] + V2[p[2]] + V3[p[1]];
|
|
h3 = V0[p[0]] + V1[p[3]] + V2[p[4]] + V3[p[5]];
|
|
h4 = H0[p[0]] + H1[p[4]] + H2[p[5]] + H3[p[6]];
|
|
h5 = V0[p[0]] + V1[p[7]] + V2[p[6]] + V3[p[5]];
|
|
h6 = V0[p[0]] + V1[p[7]] + V2[p[8]] + V3[p[1]];
|
|
/* sum values and also discover the 3 largest and 3 smallest */
|
|
big0 = small0 = h0;
|
|
small1 = small2 = G_MAXINT;
|
|
big1 = big2 = 0;
|
|
#define CHECK(xx) \
|
|
h0 += xx; \
|
|
if (xx > big2) \
|
|
{ \
|
|
if (xx > big1) \
|
|
{ \
|
|
if (xx > big0) \
|
|
{ \
|
|
big2 = big1; \
|
|
big1 = big0; \
|
|
big0 = xx; \
|
|
} \
|
|
else \
|
|
{ \
|
|
big2 = big1; \
|
|
big1 = xx; \
|
|
} \
|
|
} \
|
|
else \
|
|
big2 = xx; \
|
|
} \
|
|
if (xx < small2) \
|
|
{ \
|
|
if (xx < small1) \
|
|
{ \
|
|
if (xx < small0) \
|
|
{ \
|
|
small2 = small1; \
|
|
small1 = small0; \
|
|
small0 = xx; \
|
|
} \
|
|
else \
|
|
{ \
|
|
small2 = small1; \
|
|
small1 = xx; \
|
|
} \
|
|
} \
|
|
else \
|
|
small2 = xx; \
|
|
}
|
|
CHECK(h1)
|
|
CHECK(h2)
|
|
CHECK(h3)
|
|
CHECK(h4)
|
|
CHECK(h5)
|
|
CHECK(h6)
|
|
#undef CHECK
|
|
/* Compute mean of middle 1-3 values */
|
|
return UNSCALE(h0-big0-big1-small0-small1-ALFRAC[(big2+small2)>>SCALEB]);
|
|
}
|
|
|
|
/* Edge enhancement */
|
|
static gint
|
|
atfilt4 (gint *p)
|
|
{
|
|
gint hav;
|
|
/* map to scaled hexagon values and compute enhance value */
|
|
hav = M0[p[0]] + M1[p[3]] + M2[p[7]];
|
|
hav += H0[p[0]] + H1[p[2]] + H2[p[1]] + H3[p[8]];
|
|
hav += V0[p[0]] + V1[p[3]] + V2[p[2]] + V3[p[1]];
|
|
hav += V0[p[0]] + V1[p[3]] + V2[p[4]] + V3[p[5]];
|
|
hav += H0[p[0]] + H1[p[4]] + H2[p[5]] + H3[p[6]];
|
|
hav += V0[p[0]] + V1[p[7]] + V2[p[6]] + V3[p[5]];
|
|
hav += V0[p[0]] + V1[p[7]] + V2[p[8]] + V3[p[1]];
|
|
if (hav < 0)
|
|
hav = 0;
|
|
hav = UNSCALE(hav);
|
|
if (hav > (gdouble)255)
|
|
hav = (gdouble)255;
|
|
return hav;
|
|
}
|
|
|
|
/* Optimal estimation - do smoothing in inverse proportion */
|
|
/* to the local variance. */
|
|
/* notice we use the globals noisevariance */
|
|
gint
|
|
atfilt5(gint *p) {
|
|
gint mean,variance,temp;
|
|
gint h0,h1,h2,h3,h4,h5,h6; /* hexagon values 2 3 */
|
|
/* 1 0 4 */
|
|
/* 6 5 */
|
|
/* map to scaled hexagon values */
|
|
h0 = M0[p[0]] + M1[p[3]] + M2[p[7]];
|
|
h1 = H0[p[0]] + H1[p[2]] + H2[p[1]] + H3[p[8]];
|
|
h2 = V0[p[0]] + V1[p[3]] + V2[p[2]] + V3[p[1]];
|
|
h3 = V0[p[0]] + V1[p[3]] + V2[p[4]] + V3[p[5]];
|
|
h4 = H0[p[0]] + H1[p[4]] + H2[p[5]] + H3[p[6]];
|
|
h5 = V0[p[0]] + V1[p[7]] + V2[p[6]] + V3[p[5]];
|
|
h6 = V0[p[0]] + V1[p[7]] + V2[p[8]] + V3[p[1]];
|
|
mean = h0 + h1 + h2 + h3 + h4 + h5 + h6;
|
|
/* compute scaled mean by dividing by 7 */
|
|
mean = AVEDIV[SCTOCSC(mean)];
|
|
|
|
/* compute scaled variance */
|
|
temp = (h1 - mean); variance = SQUARE[NOCSVAL + SCTOCSC(temp)];
|
|
|
|
/* and rescale to keep */
|
|
temp = (h2 - mean); variance += SQUARE[NOCSVAL + SCTOCSC(temp)];
|
|
|
|
/* within 32 bit limits */
|
|
temp = (h3 - mean); variance += SQUARE[NOCSVAL + SCTOCSC(temp)];
|
|
temp = (h4 - mean); variance += SQUARE[NOCSVAL + SCTOCSC(temp)];
|
|
temp = (h5 - mean); variance += SQUARE[NOCSVAL + SCTOCSC(temp)];
|
|
temp = (h6 - mean); variance += SQUARE[NOCSVAL + SCTOCSC(temp)];
|
|
/* (temp = h0 - mean) */
|
|
temp = (h0 - mean); variance += SQUARE[NOCSVAL + SCTOCSC(temp)];
|
|
if (variance != 0) /* avoid possible divide by 0 */
|
|
/* optimal estimate */
|
|
temp = mean + (variance * temp) / (variance + noisevariance);
|
|
else temp = h0;
|
|
if (temp < 0)
|
|
temp = 0;
|
|
temp = RUNSCALE(temp);
|
|
if (temp > (gdouble)255) temp = (gdouble)255;
|
|
return temp;
|
|
}
|
|
|
|
|
|
/* Triangle orientation is per geometric axes (not graphical axies) */
|
|
|
|
#define NW 0 /* North west triangle /| */
|
|
#define NE 1 /* North east triangle |\ */
|
|
#define SW 2 /* South west triangle \| */
|
|
#define SE 3 /* South east triangle |/ */
|
|
#define STH 2
|
|
#define EST 1
|
|
|
|
#define SWAPI(a,b) (t = a, a = -b, b = -t)
|
|
|
|
/* compute the area of overlap of a hexagon diameter d, */
|
|
/* centered at hx,hy, with a unit square of center sx,sy. */
|
|
static gdouble
|
|
hex_area (gdouble sx, gdouble sy, gdouble hx, gdouble hy, gdouble d)
|
|
{
|
|
gdouble hx0,hx1,hx2,hy0,hy1,hy2,hy3;
|
|
gdouble sx0,sx1,sy0,sy1;
|
|
|
|
/* compute square coordinates */
|
|
sx0 = sx - 0.5;
|
|
sy0 = sy - 0.5;
|
|
sx1 = sx + 0.5;
|
|
sy1 = sy + 0.5;
|
|
/* compute hexagon coordinates */
|
|
hx0 = hx - d/2.0;
|
|
hx1 = hx;
|
|
hx2 = hx + d/2.0;
|
|
hy0 = hy - 0.5773502692 * d; /* d / sqrt(3) */
|
|
hy1 = hy - 0.2886751346 * d; /* d / sqrt(12) */
|
|
hy2 = hy + 0.2886751346 * d; /* d / sqrt(12) */
|
|
hy3 = hy + 0.5773502692 * d; /* d / sqrt(3) */
|
|
|
|
return
|
|
triang_area(sx0,sy0,sx1,sy1,hx0,hy2,hx1,hy3,NW) +
|
|
triang_area(sx0,sy0,sx1,sy1,hx1,hy2,hx2,hy3,NE) +
|
|
rectang_area(sx0,sy0,sx1,sy1,hx0,hy1,hx2,hy2) +
|
|
triang_area(sx0,sy0,sx1,sy1,hx0,hy0,hx1,hy1,SW) +
|
|
triang_area(sx0,sy0,sx1,sy1,hx1,hy0,hx2,hy1,SE);
|
|
}
|
|
|
|
static gdouble
|
|
triang_area (gdouble rx0, gdouble ry0, gdouble rx1, gdouble ry1, gdouble tx0,
|
|
gdouble ty0, gdouble tx1, gdouble ty1, gint tt)
|
|
{
|
|
gdouble a,b,c,d;
|
|
gdouble lx0,ly0,lx1,ly1;
|
|
/* Convert everything to a NW triangle */
|
|
if (tt & STH) {
|
|
gdouble t;
|
|
SWAPI(ry0,ry1);
|
|
SWAPI(ty0,ty1);
|
|
} if (tt & EST) {
|
|
gdouble t;
|
|
SWAPI(rx0,rx1);
|
|
SWAPI(tx0,tx1);
|
|
}
|
|
/* Compute overlapping box */
|
|
if (tx0 > rx0)
|
|
rx0 = tx0;
|
|
if (ty0 > ry0)
|
|
ry0 = ty0;
|
|
if (tx1 < rx1)
|
|
rx1 = tx1;
|
|
if (ty1 < ry1)
|
|
ry1 = ty1;
|
|
if (rx1 <= rx0 || ry1 <= ry0)
|
|
return 0.0;
|
|
/* Need to compute diagonal line intersection with the box */
|
|
/* First compute co-efficients to formulas x = a + by and y = c + dx */
|
|
b = (tx1 - tx0)/(ty1 - ty0);
|
|
a = tx0 - b * ty0;
|
|
d = (ty1 - ty0)/(tx1 - tx0);
|
|
c = ty0 - d * tx0;
|
|
|
|
/* compute top or right intersection */
|
|
tt = 0;
|
|
ly1 = ry1;
|
|
lx1 = a + b * ly1;
|
|
if (lx1 <= rx0)
|
|
return (rx1 - rx0) * (ry1 - ry0);
|
|
else if (lx1 > rx1) { /* could be right hand side */
|
|
lx1 = rx1;
|
|
ly1 = c + d * lx1;
|
|
if (ly1 <= ry0)
|
|
return (rx1 - rx0) * (ry1 - ry0);
|
|
tt = 1; /* right hand side intersection */
|
|
}
|
|
/* compute left or bottom intersection */
|
|
lx0 = rx0;
|
|
ly0 = c + d * lx0;
|
|
if (ly0 >= ry1)
|
|
return (rx1 - rx0) * (ry1 - ry0);
|
|
else if (ly0 < ry0) { /* could be right hand side */
|
|
ly0 = ry0;
|
|
lx0 = a + b * ly0;
|
|
if (lx0 >= rx1)
|
|
return (rx1 - rx0) * (ry1 - ry0);
|
|
tt |= 2; /* bottom intersection */
|
|
}
|
|
|
|
if (tt == 0) { /* top and left intersection */
|
|
/* rectangle minus triangle */
|
|
return ((rx1 - rx0) * (ry1 - ry0))
|
|
- (0.5 * (lx1 - rx0) * (ry1 - ly0));
|
|
}
|
|
else if (tt == 1) { /* right and left intersection */
|
|
return ((rx1 - rx0) * (ly0 - ry0))
|
|
+ (0.5 * (rx1 - rx0) * (ly1 - ly0));
|
|
} else if (tt == 2) { /* top and bottom intersection */
|
|
return ((rx1 - lx1) * (ry1 - ry0))
|
|
+ (0.5 * (lx1 - lx0) * (ry1 - ry0));
|
|
} else { /* tt == 3 */ /* right and bottom intersection */
|
|
/* triangle */
|
|
return (0.5 * (rx1 - lx0) * (ly1 - ry0));
|
|
}
|
|
}
|
|
|
|
/* Compute rectangle area */
|
|
static gdouble
|
|
rectang_area (gdouble rx0, gdouble ry0, gdouble rx1, gdouble ry1, gdouble tx0,
|
|
gdouble ty0, gdouble tx1, gdouble ty1)
|
|
{
|
|
/* Compute overlapping box */
|
|
if (tx0 > rx0)
|
|
rx0 = tx0;
|
|
if (ty0 > ry0)
|
|
ry0 = ty0;
|
|
if (tx1 < rx1)
|
|
rx1 = tx1;
|
|
if (ty1 < ry1)
|
|
ry1 = ty1;
|
|
if (rx1 <= rx0 || ry1 <= ry0)
|
|
return 0.0;
|
|
return (rx1 - rx0) * (ry1 - ry0);
|
|
}
|
|
|
|
static void
|
|
nlfilter (GObject *config,
|
|
PikaDrawable *drawable,
|
|
PikaPreview *preview)
|
|
{
|
|
GeglBuffer *src_buffer;
|
|
GeglBuffer *dest_buffer;
|
|
const Babl *format;
|
|
guchar *srcbuf, *dstbuf;
|
|
guchar *lastrow, *thisrow, *nextrow, *temprow;
|
|
gint x1, y1, y2;
|
|
gint width, height, bpp;
|
|
gint filtno, y, rowsize, exrowsize, p_update;
|
|
gdouble alpha;
|
|
gdouble radius;
|
|
gint filter;
|
|
|
|
g_object_get (config,
|
|
"alpha", &alpha,
|
|
"radius", &radius,
|
|
"filter", &filter,
|
|
NULL);
|
|
|
|
if (preview)
|
|
{
|
|
pika_preview_get_position (preview, &x1, &y1);
|
|
pika_preview_get_size (preview, &width, &height);
|
|
y2 = y1 + height;
|
|
}
|
|
else
|
|
{
|
|
if (! pika_drawable_mask_intersect (drawable,
|
|
&x1, &y1, &width, &height))
|
|
return;
|
|
|
|
y2 = y1 + height;
|
|
}
|
|
|
|
if (pika_drawable_has_alpha (drawable))
|
|
format = babl_format ("R'G'B'A u8");
|
|
else
|
|
format = babl_format ("R'G'B' u8");
|
|
|
|
src_buffer = pika_drawable_get_buffer (drawable);
|
|
|
|
if (preview)
|
|
dest_buffer = gegl_buffer_new (gegl_buffer_get_extent (src_buffer), format);
|
|
else
|
|
dest_buffer = pika_drawable_get_shadow_buffer (drawable);
|
|
|
|
bpp = babl_format_get_bytes_per_pixel (format);
|
|
|
|
rowsize = width * bpp;
|
|
exrowsize = (width + 2) * bpp;
|
|
p_update = width / 20 + 1;
|
|
|
|
/* source buffer gives one pixel margin all around destination buffer */
|
|
srcbuf = g_new0 (guchar, exrowsize * 3);
|
|
dstbuf = g_new0 (guchar, rowsize);
|
|
|
|
/* pointers to second pixel in each source row */
|
|
lastrow = srcbuf + bpp;
|
|
thisrow = lastrow + exrowsize;
|
|
nextrow = thisrow + exrowsize;
|
|
|
|
filtno = nlfiltInit (alpha, radius, filter);
|
|
|
|
if (!preview)
|
|
pika_progress_init (_("NL Filter"));
|
|
|
|
/* first row */
|
|
gegl_buffer_get (src_buffer, GEGL_RECTANGLE (x1, y1, width, 1), 1.0,
|
|
format, thisrow,
|
|
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
|
|
|
|
/* copy thisrow[0] to thisrow[-1], thisrow[width-1] to thisrow[width] */
|
|
memcpy (thisrow - bpp, thisrow, bpp);
|
|
memcpy (thisrow + rowsize, thisrow + rowsize - bpp, bpp);
|
|
/* copy whole thisrow to lastrow */
|
|
memcpy (lastrow - bpp, thisrow - bpp, exrowsize);
|
|
|
|
for (y = y1; y < y2 - 1; y++)
|
|
{
|
|
if (((y % p_update) == 0) && !preview)
|
|
pika_progress_update ((gdouble) y / (gdouble) height);
|
|
|
|
gegl_buffer_get (src_buffer, GEGL_RECTANGLE (x1, y + 1, width, 1), 1.0,
|
|
format, nextrow,
|
|
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
|
|
|
|
memcpy (nextrow - bpp, nextrow, bpp);
|
|
memcpy (nextrow + rowsize, nextrow + rowsize - bpp, bpp);
|
|
nlfiltRow (lastrow, thisrow, nextrow, dstbuf, width, bpp, filtno);
|
|
|
|
gegl_buffer_set (dest_buffer, GEGL_RECTANGLE (x1, y, width, 1), 0,
|
|
format, dstbuf,
|
|
GEGL_AUTO_ROWSTRIDE);
|
|
|
|
/* rotate row buffers */
|
|
temprow = lastrow; lastrow = thisrow;
|
|
thisrow = nextrow; nextrow = temprow;
|
|
}
|
|
|
|
/* last row */
|
|
memcpy (nextrow - bpp, thisrow - bpp, exrowsize);
|
|
nlfiltRow (lastrow, thisrow, nextrow, dstbuf, width, bpp, filtno);
|
|
|
|
gegl_buffer_set (dest_buffer, GEGL_RECTANGLE (x1, y2 - 1, width, 1), 0,
|
|
format, dstbuf,
|
|
GEGL_AUTO_ROWSTRIDE);
|
|
|
|
g_free (srcbuf);
|
|
g_free (dstbuf);
|
|
|
|
if (preview)
|
|
{
|
|
guchar *buf = g_new (guchar, width * height * bpp);
|
|
|
|
gegl_buffer_get (dest_buffer, GEGL_RECTANGLE (x1, y1, width, height), 1.0,
|
|
format, buf,
|
|
GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
|
|
|
|
pika_preview_draw_buffer (PIKA_PREVIEW (preview), buf, width * bpp);
|
|
|
|
g_free (buf);
|
|
}
|
|
|
|
g_object_unref (src_buffer);
|
|
g_object_unref (dest_buffer);
|
|
|
|
if (! preview)
|
|
{
|
|
pika_progress_update (1.0);
|
|
|
|
pika_drawable_merge_shadow (drawable, TRUE);
|
|
pika_drawable_update (drawable, x1, y1, width, height);
|
|
pika_displays_flush ();
|
|
}
|
|
}
|
|
|
|
static void
|
|
nlfilter_preview (GtkWidget *widget,
|
|
GObject *config)
|
|
{
|
|
PikaPreview *preview = PIKA_PREVIEW (widget);
|
|
PikaDrawable *drawable = g_object_get_data (config, "drawable");
|
|
|
|
nlfilter (config, drawable, preview);
|
|
}
|
|
|
|
static gboolean
|
|
nlfilter_dialog (PikaProcedure *procedure,
|
|
GObject *config,
|
|
PikaDrawable *drawable)
|
|
{
|
|
GtkWidget *dialog;
|
|
GtkWidget *preview;
|
|
GtkListStore *store;
|
|
GtkWidget *frame;
|
|
GtkWidget *scale;
|
|
gboolean run;
|
|
|
|
pika_ui_init (PLUG_IN_BINARY);
|
|
|
|
dialog = pika_procedure_dialog_new (procedure,
|
|
PIKA_PROCEDURE_CONFIG (config),
|
|
_("NL Filter"));
|
|
|
|
pika_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
|
|
GTK_RESPONSE_OK,
|
|
GTK_RESPONSE_CANCEL,
|
|
-1);
|
|
|
|
pika_window_set_transient (GTK_WINDOW (dialog));
|
|
|
|
preview = pika_drawable_preview_new_from_drawable (drawable);
|
|
gtk_box_pack_start (GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (dialog))),
|
|
preview, TRUE, TRUE, 0);
|
|
gtk_widget_set_margin_bottom (preview, 12);
|
|
gtk_widget_show (preview);
|
|
|
|
store = pika_int_store_new (_("Alpha trimmed mean"), 0,
|
|
_("Optimal estimation"), 1,
|
|
_("Edge enhancement"), 2,
|
|
NULL);
|
|
frame = pika_procedure_dialog_get_int_radio (PIKA_PROCEDURE_DIALOG (dialog),
|
|
"filter", PIKA_INT_STORE (store));
|
|
gtk_widget_set_margin_bottom (frame, 12);
|
|
|
|
scale = pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
|
|
"alpha", 1.0);
|
|
gtk_widget_set_margin_bottom (scale, 12);
|
|
|
|
scale = pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
|
|
"radius", 1.0);
|
|
gtk_widget_set_margin_bottom (scale, 12);
|
|
|
|
pika_procedure_dialog_fill_box (PIKA_PROCEDURE_DIALOG (dialog),
|
|
"nlfilter-vbox", "filter", "alpha",
|
|
"radius", NULL);
|
|
|
|
g_object_set_data (config, "drawable", drawable);
|
|
|
|
g_signal_connect (preview, "invalidated",
|
|
G_CALLBACK (nlfilter_preview),
|
|
config);
|
|
|
|
g_signal_connect_swapped (config, "notify",
|
|
G_CALLBACK (pika_preview_invalidate),
|
|
preview);
|
|
|
|
pika_procedure_dialog_fill (PIKA_PROCEDURE_DIALOG (dialog),
|
|
"nlfilter-vbox", NULL);
|
|
|
|
gtk_widget_show (dialog);
|
|
|
|
run = pika_procedure_dialog_run (PIKA_PROCEDURE_DIALOG (dialog));
|
|
|
|
gtk_widget_destroy (dialog);
|
|
|
|
return run;
|
|
}
|
