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/* count lines
*
* Copyright: 1990, N. Dessipris.
*
* Author: Nicos Dessipris
* Written on: 02/05/1990
* Modified on :
*
* 19/9/95 JC
* - tidied up
* 23/10/10
* - gtk-doc
* 17/1/14
* - redone as a class, now just a convenience function
*/
/*
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 <vips/vips.h>
#include <vips/internal.h>
#include <vips/debug.h>
#include "pmorphology.h"
typedef struct _VipsCountlines {
VipsMorphology parent_instance;
double nolines;
VipsDirection direction;
} VipsCountlines;
typedef VipsMorphologyClass VipsCountlinesClass;
G_DEFINE_TYPE(VipsCountlines, vips_countlines, VIPS_TYPE_MORPHOLOGY);
static int
vips_countlines_build(VipsObject *object)
{
VipsMorphology *morphology = VIPS_MORPHOLOGY(object);
VipsCountlines *countlines = (VipsCountlines *) object;
VipsImage *in = morphology->in;
VipsImage **t = (VipsImage **) vips_object_local_array(object, 7);
double nolines;
if (VIPS_OBJECT_CLASS(vips_countlines_parent_class)->build(object))
return -1;
/* Compiler warnings.
*/
nolines = 1;
switch (countlines->direction) {
case VIPS_DIRECTION_HORIZONTAL:
if (!(t[0] = vips_image_new_matrixv(1, 2, -1.0, 1.0)) ||
vips_moreeq_const1(in, &t[1], 128, NULL) ||
vips_conv(t[1], &t[2], t[0],
"precision", VIPS_PRECISION_INTEGER,
NULL) ||
vips_project(t[2], &t[3], &t[4], NULL) ||
vips_avg(t[3], &nolines, NULL))
return -1;
break;
case VIPS_DIRECTION_VERTICAL:
if (!(t[0] = vips_image_new_matrixv(2, 1, -1.0, 1.0)) ||
vips_moreeq_const1(in, &t[1], 128, NULL) ||
vips_conv(t[1], &t[2], t[0],
"precision", VIPS_PRECISION_INTEGER,
NULL) ||
vips_project(t[2], &t[3], &t[4], NULL) ||
vips_avg(t[4], &nolines, NULL))
return -1;
break;
default:
g_assert_not_reached();
}
g_object_set(object, "nolines", nolines / 255.0, NULL);
return 0;
}
static void
vips_countlines_class_init(VipsCountlinesClass *class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS(class);
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS(class);
VIPS_DEBUG_MSG("vips_countlines_class_init\n");
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "countlines";
vobject_class->description = _("count lines in an image");
vobject_class->build = vips_countlines_build;
VIPS_ARG_DOUBLE(class, "nolines", 2,
_("Nolines"),
_("Number of lines"),
VIPS_ARGUMENT_REQUIRED_OUTPUT,
G_STRUCT_OFFSET(VipsCountlines, nolines),
0, 10000000, 0.0);
VIPS_ARG_ENUM(class, "direction", 3,
_("Direction"),
_("Countlines left-right or up-down"),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET(VipsCountlines, direction),
VIPS_TYPE_DIRECTION, VIPS_DIRECTION_HORIZONTAL);
}
static void
vips_countlines_init(VipsCountlines *countlines)
{
}
/**
* vips_countlines: (method)
* @in: input image
* @nolines: (out): output average number of lines
* @direction: count lines horizontally or vertically
* @...: `NULL`-terminated list of optional named arguments
*
* Function which calculates the number of transitions
* between black and white for the horizontal or the vertical
* direction of an image. black<128 , white>=128
* The function calculates the number of transitions for all
* Xsize or Ysize and returns the mean of the result
* Input should be one band, 8-bit.
*
* ::: seealso
* [method@Image.morph], [method@Image.conv].
*
* Returns: 0 on success, -1 on error.
*/
int
vips_countlines(VipsImage *in, double *nolines,
VipsDirection direction, ...)
{
va_list ap;
int result;
va_start(ap, direction);
result = vips_call_split("countlines", ap, in, nolines, direction);
va_end(ap);
return result;
}
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