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diff --git a/backend/genesys/conv.h b/backend/genesys/conv.h
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+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2019 Povilas Kanapickas <povilas@radix.lt>
+
+   This file is part of the SANE package.
+
+   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., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice.
+*/
+
+#ifndef BACKEND_GENESYS_CONV_H
+#define BACKEND_GENESYS_CONV_H
+
+#include "device.h"
+#include "sensor.h"
+#include "genesys.h"
+
+namespace genesys {
+
+void binarize_line(Genesys_Device* dev, std::uint8_t* src, std::uint8_t* dst, int width);
+
+void genesys_gray_lineart(Genesys_Device* dev,
+                          std::uint8_t* src_data, std::uint8_t* dst_data,
+                          std::size_t pixels, size_t lines, std::uint8_t threshold);
+
+void genesys_crop(Genesys_Scanner* s);
+
+void genesys_deskew(Genesys_Scanner *s, const Genesys_Sensor& sensor);
+
+void genesys_despeck(Genesys_Scanner* s);
+
+void genesys_derotate(Genesys_Scanner* s);
+
+} // namespace genesys
+
+#endif // BACKEND_GENESYS_CONV_H