PatchFeatureEntry.cpp

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// ****************************************************************************
// Filename:  PatchFeatureEntry.cpp
// Author:    Pedram Azad
// Date:      24.09.2008
// ****************************************************************************


// ****************************************************************************
// Includes
// ****************************************************************************

#include <new> // for explicitly using correct new/delete operators on VC DSPs

#include "PatchFeatureEntry.h"

#include "Image/ByteImage.h"



bool CPatchFeatureEntry::ExtractFeature(const CByteImage *pImage, int nWindowSize, float x, float y)
{
        const int width = pImage->width;
        const int height = pImage->height;
        
        if (x < nWindowSize / 2 || x >= width - nWindowSize / 2 || y < nWindowSize / 2 || y >= height - nWindowSize / 2)
                return false;

        // construct new feature entry
        Math2d::SetVec(point, x, y);
        m_nSize = nWindowSize * nWindowSize;
        if (m_pFeature) delete [] m_pFeature;
        m_pFeature = new float[m_nSize];

        // extract the feature
        const int diff = width - nWindowSize;
        const int offset = (int(y) - nWindowSize / 2) * width + (int(x) - nWindowSize / 2);
        const unsigned char *input = pImage->pixels;
        
        // determine normalized patch in left image
        for (int i = 0, offset2 = offset, offset3 = 0; i < nWindowSize; i++, offset2 += diff)
                for (int j = 0; j < nWindowSize; j++, offset2++, offset3++)
                {
                        m_pFeature[offset3] = input[offset2];
                }

        return true;
}