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import from github

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diff --git a/filter.h b/filter.h
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+/**
+* @file			filter.h
+* @brief		various filtering algorithm definitions
+* @author		Patrick Roth - roth@stettbacher.ch
+* @version		1.0
+* @date			2015-08-28
+* @copyright	2012-2016 Stettbacher Signal Processing AG
+* 
+* @remarks
+*
+* <PRE>
+* This library 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 2.1 of the License, or (at your option) any later version.
+*
+* This library 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 library; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+* </PRE>
+*
+*/
+
+
+#ifndef _FILTER_H
+#define _FILTER_H
+
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+void filter_sobel_3s16(int16_t *img_sobel, const int16_t *img_in, const int height, const int width,
+					   const int skip_ch1, const int skip_ch2, const int skip_ch3) ;
+
+void filter_gauss_3s16(int16_t *img_gauss, const int16_t *img_in, const int height, const int width, int kernel_size, const float spread,
+					   const int skip_ch1, const int skip_ch2, const int skip_ch3);
+
+void filter_binary_3s16(int8_t *img_bin, const int16_t *img_in, const int height, const int width, const int16_t threshold, const int8_t bin_value,
+						const int skip_ch1, const int skip_ch2, const int skip_ch3);
+
+#if defined(__cplusplus) || defined(c_plusplus)
+} // extern "C"
+#endif
+
+
+#endif // _FILTER_H
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