denoise.h

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#include <vigra/stdimage.hxx>
#include <vigra/pixelneighborhood.hxx>

template <class SrcIterator, class SrcAccessor,
          class DestIterator, class DestAccessor>
void simpleDenoise(SrcIterator sy, SrcIterator send, SrcAccessor sa,
                   DestIterator dy, DestAccessor da) {
    int width = send.x - sy.x;
    int height = send.y - sy.y;
    
    sy.y++, dy.y++;
    
    for (int y=1; y<height-1; ++y, ++dy.y, ++sy.y) {
        SrcIterator sx = sy;
        DestIterator dx = dy;
        sx.x++, dx.x++;
        
        for (int x=1; x<width-1; ++x, ++dx.x, ++sx.x) {
            vigra::NeighborhoodCirculator<SrcIterator, vigra::EightNeighborCode>
                           circulator(sx),
                           end(circulator);
            int whitePixels = 0;
            int blackPixels = 0;
            do
            {
                if (*circulator > 127)
                    whitePixels++;
                else
                    blackPixels++;
            }
            while(++circulator != end);
            
            if (whitePixels > 6) {
                *dx = 255;
            } else if (blackPixels > 6) {
                *dx = 0;
            } else {
                *dx = *sx;
            }
        }
    }
}

template <class SrcIterator, class SrcAccessor,
          class DestIterator, class DestAccessor>
void simpleDenoise(vigra::triple<SrcIterator, SrcIterator, SrcAccessor> src,
                    std::pair<DestIterator, DestAccessor> dest) {
    simpleDenoise(src.first, src.second, src.third, dest.first, dest.second);
}