zerocrossinghoriz.h

来自「barcode readers [ from Image]」· C头文件 代码 · 共 72 行

//
// ZeroCrossing.h
//   Finds the zero crossings in an 8-bit edge-labeled image.
//   The input image should have been labeled with an edge filter
//   that produces an 8-bit signed value, with 0x00 = -128, x0ff = +127.
//   This class produces a linear array of arrays of floating point values,
//   one array per row, which are the estimated zero crossing positions of
//   pixels where one grayvalue is < 0x80 (= 0) and the next is > 0x80,
//   or vice versa. Also included in the list are pixel positions where the
//   pixel value = 0x80 (= 0).
//   The result array strength gives the zero crossing strength, which is the
//   signed difference between the left and right pixel, or zero in the case
//   where the pixel value is 0.
//
// Copyright (C) 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 CZeroCrossingHoriz_h
#define CZeroCrossingHoriz_h

#include "Array.h"
#include "PipelineStage.h"

#include <e32base.h>
#include <e32cons.h>

namespace Algorithm
{

	class CZeroCrossingHoriz : public CBase
	{
		// Lifecycle
	public:
		IMPORT_C static CZeroCrossingHoriz* NewL(int nMinStrength);
		~CZeroCrossingHoriz();
	private:
		CZeroCrossingHoriz(int nMinStrength);

		// Operations
	public:
		// Input parameters:
		//   image: the input image. non-edge pixels are 0, edge pixels are non-zero.
		// Output parameters:
		//   position: array of arrays of zero crossing positions
		//   strength: strength of the zero crossing, the signed difference of the
		//      left minus the right pixel
		void FindZeroCrossingsL(Core::CImage image, 
			Core::CArray<CArrayFixFlat<TReal>*>*& position);

	private:
		// Attributes
		int inMinStrength; // minimum zero crossing strength
	};

};

#endif // CZeroCrossingHoriz_h