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import from github

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diff --git a/color.h b/color.h
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+/**
+* @file			color.h
+* @brief		color utility function definition
+* @author		Patrick Roth - roth@stettbacher.ch
+* @version		1.0
+* @date			2015-08-20
+* @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 _COLOR_H
+#define _COLOR_H
+
+#include "color_pipe.h"
+
+
+#define RGB2YUV_COEFF_Y_RED				0.299			///< RGB to YUV conversion coefficient for Y-Channel: red
+#define RGB2YUV_COEFF_Y_GREEN			0.587			///< RGB to YUV conversion coefficient for Y-Channel: green
+#define RGB2YUV_COEFF_Y_BLUE			0.114			///< RGB to YUV conversion coefficient for Y-Channel: blue
+
+#define RGB2YUV_COEFF_U_RED				(-0.299)		///< RGB to YUV conversion coefficient for U-Channel: red
+#define RGB2YUV_COEFF_U_GREEN			(-0.587)		///< RGB to YUV conversion coefficient for U-Channel: green
+#define RGB2YUV_COEFF_U_BLUE			0.886			///< RGB to YUV conversion coefficient for U-Channel: blue
+	
+#define RGB2YUV_COEFF_V_RED				0.701			///< RGB to YUV conversion coefficient for V-Channel: red
+#define RGB2YUV_COEFF_V_GREEN			(-0.587)		///< RGB to YUV conversion coefficient for V-Channel: green
+#define RGB2YUV_COEFF_V_BLUE			(-0.114)		///< RGB to YUV conversion coefficient for V-Channel: blue
+
+
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+int color_rgb_to_yuv(int16_t *img_yuv, const void *img_rgb, const int height, const int width, const int bit_channel);
+int color_yuv_to_rgb(void *img_rgb, const int16_t *img_yuv, const int height, const int width, const int bit_channel);
+
+int color_calib(struct color_calib_data_t *color_calib);
+	
+#if defined(__cplusplus) || defined(c_plusplus)
+} // extern "C"
+#endif
+
+
+#endif // _COLOR_H