tests/validation/reference/LaplacianPyramid.cpp

/*
 * Copyright (c) 2018 ARM Limited.
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 * SPDX-License-Identifier: MIT
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 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "LaplacianPyramid.h"

#include "tests/validation/reference/ArithmeticSubtraction.h"
#include "tests/validation/reference/DepthConvertLayer.h"
#include "tests/validation/reference/Gaussian5x5.h"
#include "tests/validation/reference/GaussianPyramidHalf.h"

namespace arm_compute
{
namespace test
{
namespace validation
{
namespace reference
{
template <typename T, typename U>
std::vector<SimpleTensor<U>> laplacian_pyramid(const SimpleTensor<T> &src, SimpleTensor<U> &dst, size_t num_levels, BorderMode border_mode, uint8_t constant_border_value)
{
    std::vector<SimpleTensor<T>> pyramid_conv;
    std::vector<SimpleTensor<U>> pyramid_dst;

    // First, a Gaussian pyramid with SCALE_PYRAMID_HALF is created
    std::vector<SimpleTensor<T>> gaussian_level_pyramid = reference::gaussian_pyramid_half(src, border_mode, constant_border_value, num_levels);

    // For each level i, the corresponding image Ii is blurred with Gaussian 5x5
    // filter, and the difference between the two images is the corresponding
    // level Li of the Laplacian pyramid
    for(size_t i = 0; i < num_levels; ++i)
    {
        const SimpleTensor<T> level_filtered = reference::gaussian5x5(gaussian_level_pyramid[i], border_mode, constant_border_value);
        pyramid_conv.push_back(level_filtered);

        const SimpleTensor<U> level_sub = reference::arithmetic_subtraction<T, T, U>(gaussian_level_pyramid[i], level_filtered, dst.data_type(), ConvertPolicy::WRAP);
        pyramid_dst.push_back(level_sub);
    }

    // Return the lowest resolution image and the pyramid
    dst = depth_convert<T, U>(pyramid_conv[num_levels - 1], DataType::S16, ConvertPolicy::WRAP, 0);

    return pyramid_dst;
}

template std::vector<SimpleTensor<int16_t>> laplacian_pyramid(const SimpleTensor<uint8_t> &src, SimpleTensor<int16_t> &dst, size_t num_levels, BorderMode border_mode, uint8_t constant_border_value);
} // namespace reference
} // namespace validation
} // namespace test
} // namespace arm_compute