mirror1d.hpp

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#pragma once
 
#include "NumCpp/Core/Internal/StaticAsserts.hpp"
#include "NumCpp/Core/Slice.hpp"
#include "NumCpp/Core/Types.hpp"
#include "NumCpp/Functions/fliplr.hpp"
#include "NumCpp/NdArray.hpp"
 
namespace nc::filter::boundary
{
    //============================================================================
    // Method Description:
    template<typename dtype>
    NdArray<dtype> mirror1d(const NdArray<dtype>& inImage, uint32 inBoundarySize)
    {
        STATIC_ASSERT_ARITHMETIC(dtype);
 
        const uint32 outSize = inImage.size() + inBoundarySize * 2;
 
        NdArray<dtype> outArray(1, outSize);
        outArray.put(Slice(inBoundarySize, inBoundarySize + inImage.size()), inImage);
 
        // left
        outArray.put(Slice(0, inBoundarySize), fliplr(inImage[Slice(1, inBoundarySize + 1)]));
 
        // right
        outArray.put(Slice(inImage.size() + inBoundarySize, outSize),
                     fliplr(inImage[Slice(-static_cast<int32>(inBoundarySize) - 1, -1)]));
 
        return outArray;
    }
} // namespace nc::filter::boundary