verticalaverage.cpp

来自「barcode readers [ from Image]」· C++ 代码 · 共 73 行

//
// VerticalAverage
//   Returns a 1-dimensional array that is the average value in 
//   each column of the image.
//
// 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
//

#include "VerticalAverage.h"

#include "Debug.h"
#include "GrayImageIter.h"
#include "Image.h"
#include "ImageSize.h"

#include <e32std.h>
#include <fbs.h>

using namespace Core;

namespace Algorithm
{

	EXPORT_C CVerticalAverage* CVerticalAverage::NewL()
	{	
		return new (ELeave) CVerticalAverage();	
	}

	CVerticalAverage::~CVerticalAverage()
	{
	}

	CVerticalAverage::CVerticalAverage() 
	{
	}

	void CVerticalAverage::DoItL(CImage image, CArray<unsigned char>*& average)
	{
		IImageSize size(image);
		CArray<int>* pSum = CArray<int>::NewL(size.Width());
		CleanupStack::PushL(pSum);
		Mem::FillZ((TAny*)&(*pSum)[0], size.Width() * sizeof(int));
		image.LockLC();
		IGrayImageIter it(image);
		int i;
		for (; !it.End(); it.NextRow()) {
			for (i=0; !it.REnd(); it++, i++) {
				(*pSum)[i] += it();
			}
		}
		CleanupStack::PopAndDestroy(); // unlock
		average = CArray<unsigned char>::NewL(size.Width());
		for (i=0; i<size.Width(); i++) {
			(*average)[i] = (unsigned char) ((*pSum)[i] / size.Height());
		}
		CleanupStack::PopAndDestroy(pSum);
	}
};