rgb2hsv.h

barcode readers [ from Image]

//
// Rgb2Hsv.h
//   Pipeline stage converts a color image to hue, saturation, value
//
// Copyright (C) 2003, 2006 by Jon A. Webb (Contact via GMail; username is jonawebb)
//
// 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
//

#ifndef CRgb2Hsv_h
#define CRgb2Hsv_h

#include "ImageSize.h"
#include "PipelineStage.h"

#include <e32cons.h>
#include <e32std.h>

namespace Algorithm
{

	class CRgb2Hsv :
		public Core::MPipelineStage
	{
		// Lifecycle
	public:
		IMPORT_C static CRgb2Hsv* NewL();
		~CRgb2Hsv(void);
	private:
		CRgb2Hsv(void);

		///////////////////// Overrides ////////////////////////
		//
		// Overrides from MPipelineStage:
		//
			// Operations
		public:
			Core::CImage FrontL();
			void PushL(Core::CImage);

			// Accessors
		public:
			bool Empty() const;
		//
		//
		/////////////////// End of overrides ///////////////////


		// operations
		// RGBtoHSV
		//   Converts input rgb color value to HSV value
		//   All data are unsigned char
		// r,g,b values are from 0 to 255
		// h = [0,242],255   
		//  magenta = 0 red = 40 yellow = 80
		//  yellowish-green = 81 green = 121 cyan = 161               
		//  cyanish-blue = 162 blue = 202 bluish-magenta = 242 
		//  if s == 0 or r = g = b, then h = 255 (undefined)
		// s = [0,255],	  
		// v = [0,255]
		// 
		static void CRgb2Hsv::RGBtoHSV(
			unsigned char r, 
			unsigned char g, 
			unsigned char b, 
			unsigned char *h, 
			unsigned char *s, 
			unsigned char *v );

	private:
		// Attributes
		bool ibEmpty;
		Core::CImage iImage;
		Core::IImageSize iSize;
	};

};

#endif // CRgb2Hsv_h