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/*
* Copyright (c) 2017 Arm Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "IntegralImage.h"
namespace arm_compute
{
namespace test
{
namespace validation
{
namespace reference
{
template <typename T>
SimpleTensor<uint32_t> integral_image(const SimpleTensor<T> &src)
{
SimpleTensor<uint32_t> dst(src.shape(), DataType::U32);
// Length of dimensions
const size_t width = src.shape().x();
const size_t height = src.shape().y();
const size_t depth = src.shape().total_size_upper(2);
const size_t image_size = width * height;
for(size_t z = 0; z < depth; ++z)
{
size_t current_image = z * image_size;
//First element of each image
dst[current_image] = src[current_image];
// First row of each image (add only pixel on the left)
for(size_t x = 1; x < width; ++x)
{
dst[current_image + x] = static_cast<uint32_t>(src[current_image + x]) + dst[current_image + x - 1];
}
// Subsequent rows
for(size_t y = 1; y < height; ++y)
{
size_t current_row = current_image + (width * y);
// First element of each row (add only pixel up)
dst[current_row] = static_cast<uint32_t>(src[current_row]) + dst[current_row - width];
// Following row elements
for(size_t x = 1; x < width; ++x)
{
size_t current_pixel = current_row + x;
// out = in + up(out) + left(out) - up_left(out)
dst[current_pixel] = static_cast<uint32_t>(src[current_pixel]) + dst[current_pixel - 1]
+ dst[current_pixel - width] - dst[current_pixel - width - 1];
}
}
}
return dst;
}
template SimpleTensor<uint32_t> integral_image(const SimpleTensor<uint8_t> &src);
} // namespace reference
} // namespace validation
} // namespace test
} // namespace arm_compute
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