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/*
* Copyright (c) 2017-2019 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 "arm_compute/core/Helpers.h"
#include "Utils.h"
#include "WarpPerspective.h"
namespace arm_compute
{
namespace test
{
namespace validation
{
namespace reference
{
template <typename T>
SimpleTensor<T> warp_perspective(const SimpleTensor<T> &src, SimpleTensor<T> &valid_mask, const float *matrix, InterpolationPolicy policy, BorderMode border_mode, uint8_t constant_border_value)
{
SimpleTensor<T> dst(src.shape(), src.data_type());
// x0 = M00 * x + M01 * y + M02
// y0 = M10 * x + M11 * y + M12
// z0 = M20 * x + M21 * y + M22
// xn = x0 / z0
// yn = y0 / z0
const float M00 = matrix[0];
const float M10 = matrix[1];
const float M20 = matrix[2];
const float M01 = matrix[0 + 1 * 3];
const float M11 = matrix[1 + 1 * 3];
const float M21 = matrix[2 + 1 * 3];
const float M02 = matrix[0 + 2 * 3];
const float M12 = matrix[1 + 2 * 3];
const float M22 = matrix[2 + 2 * 3];
const int width = src.shape().x();
const int height = src.shape().y();
const uint32_t num_elements = src.num_elements();
for(uint32_t element_idx = 0; element_idx < num_elements; ++element_idx)
{
valid_mask[element_idx] = 1;
Coordinates id = index2coord(src.shape(), element_idx);
const int idx = id.x();
const int idy = id.y();
const float z0 = M20 * idx + M21 * idy + M22;
const float x0 = (M00 * idx + M01 * idy + M02);
const float y0 = (M10 * idx + M11 * idy + M12);
const float xn = x0 / z0;
const float yn = y0 / z0;
id.set(0, static_cast<int>(std::floor(xn)));
id.set(1, static_cast<int>(std::floor(yn)));
if((0 <= yn) && (yn < height) && (0 <= xn) && (xn < width))
{
switch(policy)
{
case InterpolationPolicy::NEAREST_NEIGHBOR:
dst[element_idx] = tensor_elem_at(src, id, border_mode, constant_border_value);
break;
case InterpolationPolicy::BILINEAR:
(valid_bilinear_policy(xn, yn, width, height, border_mode)) ? dst[element_idx] = bilinear_policy(src, id, xn, yn, border_mode, constant_border_value) : valid_mask[element_idx] = 0;
break;
case InterpolationPolicy::AREA:
default:
ARM_COMPUTE_ERROR("Interpolation not supported");
break;
}
}
else
{
if(border_mode == BorderMode::UNDEFINED)
{
valid_mask[element_idx] = 0;
}
else
{
switch(policy)
{
case InterpolationPolicy::NEAREST_NEIGHBOR:
if(border_mode == BorderMode::CONSTANT)
{
dst[element_idx] = constant_border_value;
}
else if(border_mode == BorderMode::REPLICATE)
{
id.set(0, std::max(0, std::min(static_cast<int>(xn), width - 1)));
id.set(1, std::max(0, std::min(static_cast<int>(yn), height - 1)));
dst[element_idx] = src[coord2index(src.shape(), id)];
}
break;
case InterpolationPolicy::BILINEAR:
dst[element_idx] = bilinear_policy(src, id, xn, yn, border_mode, constant_border_value);
break;
case InterpolationPolicy::AREA:
default:
ARM_COMPUTE_ERROR("Interpolation not supported");
break;
}
}
}
}
return dst;
}
template SimpleTensor<uint8_t> warp_perspective(const SimpleTensor<uint8_t> &src, SimpleTensor<uint8_t> &valid_mask, const float *matrix, InterpolationPolicy policy, BorderMode border_mode,
uint8_t constant_border_value);
} // namespace reference
} // namespace validation
} // namespace test
} // namespace arm_compute
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