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/* hough transform
*
* 7/3/14
* - from hist_find.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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <string.h>
#include <vips/vips.h>
#include "statistic.h"
#include "hough.h"
G_DEFINE_ABSTRACT_TYPE(VipsHough, vips_hough, VIPS_TYPE_STATISTIC);
static VipsImage *
vips_hough_new_accumulator(VipsHough *hough)
{
VipsHoughClass *class = VIPS_HOUGH_GET_CLASS(hough);
VipsStatistic *statistic = VIPS_STATISTIC(hough);
VipsImage *accumulator;
accumulator = vips_image_new_memory();
if (vips_image_pipelinev(accumulator,
VIPS_DEMAND_STYLE_ANY, statistic->ready, NULL) ||
class->init_accumulator(hough, accumulator) ||
vips_image_write_prepare(accumulator)) {
g_object_unref(accumulator);
return NULL;
}
return accumulator;
}
static int
vips_hough_build(VipsObject *object)
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS(object);
VipsStatistic *statistic = VIPS_STATISTIC(object);
VipsHough *hough = (VipsHough *) object;
VipsImage *out;
/* Mono only, we use the bands dimension of the output image for
* a parameter.
*/
if (statistic->in)
if (vips_check_mono(class->nickname, statistic->in))
return -1;
if (!(out = vips_hough_new_accumulator(hough)))
return -1;
g_object_set(object,
"out", out,
NULL);
if (VIPS_OBJECT_CLASS(vips_hough_parent_class)->build(object))
return -1;
return 0;
}
/* Build a new accumulator.
*/
static void *
vips_hough_start(VipsStatistic *statistic)
{
VipsHough *hough = (VipsHough *) statistic;
VipsImage *accumulator;
if (!(accumulator = vips_hough_new_accumulator(hough)))
return NULL;
return (void *) accumulator;
}
/* Add our finished accumulator to the main area.
*/
static int
vips_hough_stop(VipsStatistic *statistic, void *seq)
{
VipsImage *accumulator = (VipsImage *) seq;
VipsHough *hough = (VipsHough *) statistic;
if (vips_draw_image(hough->out, accumulator, 0, 0,
"mode", VIPS_COMBINE_MODE_ADD,
NULL)) {
g_object_unref(accumulator);
return -1;
}
g_object_unref(accumulator);
return 0;
}
static int
vips_hough_scan(VipsStatistic *statistic,
void *seq, int x, int y, void *in, int n)
{
VipsHough *hough = (VipsHough *) statistic;
VipsHoughClass *class = VIPS_HOUGH_GET_CLASS(hough);
VipsImage *accumulator = (VipsImage *) seq;
VipsPel *p = (VipsPel *) in;
int i;
for (i = 0; i < n; i++)
if (p[i])
class->vote(hough, accumulator, x + i, y);
return 0;
}
#define UC VIPS_FORMAT_UCHAR
/* Input image is cast to this format.
*/
static const VipsBandFormat vips_hough_format_table[10] = {
/* Band format: UC C US S UI I F X D DX */
/* Promotion: */ UC, UC, UC, UC, UC, UC, UC, UC, UC, UC
};
static void
vips_hough_class_init(VipsHoughClass *class)
{
GObjectClass *gobject_class = (GObjectClass *) class;
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsStatisticClass *sclass = VIPS_STATISTIC_CLASS(class);
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "hough";
object_class->description = _("find hough transform");
object_class->build = vips_hough_build;
sclass->start = vips_hough_start;
sclass->scan = vips_hough_scan;
sclass->stop = vips_hough_stop;
sclass->format_table = vips_hough_format_table;
VIPS_ARG_IMAGE(class, "out", 100,
_("Output"),
_("Output image"),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET(VipsHough, out));
}
static void
vips_hough_init(VipsHough *hough)
{
}
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