/usr/include/gwyddion/libprocess/hough.h is in libgwyddion20-dev 2.44-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* @(#) $Id: hough.h 15598 2013-11-11 12:33:32Z yeti-dn $
* Copyright (C) 2003 David Necas (Yeti), Petr Klapetek.
* E-mail: yeti@gwyddion.net, klapetek@gwyddion.net.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
*
* You should have received a copy of the GNU 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.
*/
#ifndef __GWY_PROCESS_HOUGH_H__
#define __GWY_PROCESS_HOUGH_H__
#include <libprocess/datafield.h>
G_BEGIN_DECLS
void gwy_data_field_hough_line(GwyDataField *dfield,
GwyDataField *x_gradient,
GwyDataField *y_gradient,
GwyDataField *result,
gint hwidth,
gboolean overlapping);
void gwy_data_field_hough_circle(GwyDataField *dfield,
GwyDataField *x_gradient,
GwyDataField *y_gradient,
GwyDataField *result,
gdouble radius);
void gwy_data_field_hough_line_strenghten(GwyDataField *dfield,
GwyDataField *x_gradient,
GwyDataField *y_gradient,
gint hwidth,
gdouble threshold);
void gwy_data_field_hough_circle_strenghten(GwyDataField *dfield,
GwyDataField *x_gradient,
GwyDataField *y_gradient,
gdouble radius,
gdouble threshold);
gint gwy_data_field_get_local_maxima_list(GwyDataField *dfield,
gdouble *xdata,
gdouble *ydata,
gdouble *zdata,
gint ndata,
gint skip,
gdouble threshold,
gboolean subpixel);
void gwy_data_field_hough_polar_line_to_datafield(GwyDataField *dfield,
gdouble rho,
gdouble theta,
gint *px1,
gint *px2,
gint *py1,
gint *py2);
void gwy_data_field_hough_datafield_line_to_polar(gint px1,
gint px2,
gint py1,
gint py2,
gdouble *rho,
gdouble *theta);
G_END_DECLS
#endif /* __GWY_PROCESS_INTTRANS_H__ */
/* vim: set cin et ts=4 sw=4 cino=>1s,e0,n0,f0,{0,}0,^0,\:1s,=0,g1s,h0,t0,+1s,c3,(0,u0 : */
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