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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 "CannyEdgeDetector.h"
-
-#include "Utils.h"
-#include "support/ToolchainSupport.h"
-#include "tests/validation/Helpers.h"
-#include "tests/validation/reference/Magnitude.h"
-#include "tests/validation/reference/NonMaximaSuppression.h"
-#include "tests/validation/reference/Phase.h"
-#include "tests/validation/reference/Sobel.h"
-
-#include <cmath>
-#include <stack>
-
-namespace arm_compute
-{
-namespace test
-{
-namespace validation
-{
-namespace reference
-{
-namespace
-{
-const auto MARK_ZERO = 0u;
-const auto MARK_MAYBE = 127u;
-const auto MARK_EDGE = 255u;
-
-template <typename T>
-void trace_edge(SimpleTensor<T> &dst, const ValidRegion &valid_region)
-{
- std::stack<Coordinates> pixels_stack;
- for(auto i = 0; i < dst.num_elements(); ++i)
- {
- if(dst[i] == MARK_EDGE)
- {
- pixels_stack.push(index2coord(dst.shape(), i));
- }
- }
-
- while(!pixels_stack.empty())
- {
- const Coordinates pixel_coord = pixels_stack.top();
- pixels_stack.pop();
-
- std::array<Coordinates, 8> neighbours =
- {
- {
- Coordinates(pixel_coord.x() - 1, pixel_coord.y() + 0),
- Coordinates(pixel_coord.x() + 1, pixel_coord.y() + 0),
- Coordinates(pixel_coord.x() - 1, pixel_coord.y() - 1),
- Coordinates(pixel_coord.x() + 1, pixel_coord.y() + 1),
- Coordinates(pixel_coord.x() + 0, pixel_coord.y() - 1),
- Coordinates(pixel_coord.x() + 0, pixel_coord.y() + 1),
- Coordinates(pixel_coord.x() + 1, pixel_coord.y() - 1),
- Coordinates(pixel_coord.x() - 1, pixel_coord.y() + 1)
- }
- };
-
- // Mark MAYBE neighbours as edges since they are next to an EDGE
- std::for_each(neighbours.begin(), neighbours.end(), [&](Coordinates & coord)
- {
- if(is_in_valid_region(valid_region, coord))
- {
- const size_t pixel_index = coord2index(dst.shape(), coord);
- const T pixel = dst[pixel_index];
- if(pixel == MARK_MAYBE)
- {
- dst[pixel_index] = MARK_EDGE;
- pixels_stack.push(coord);
- }
- }
- });
- }
-
- // Mark all remaining MAYBE pixels as ZERO (not edges)
- for(auto i = 0; i < dst.num_elements(); ++i)
- {
- if(dst[i] == MARK_MAYBE)
- {
- dst[i] = MARK_ZERO;
- }
- }
-}
-
-template <typename U, typename T>
-SimpleTensor<T> canny_edge_detector_impl(const SimpleTensor<T> &src, int32_t upper, int32_t lower, int gradient_size, MagnitudeType norm_type,
- BorderMode border_mode, T constant_border_value)
-{
- ARM_COMPUTE_ERROR_ON(gradient_size != 3 && gradient_size != 5 && gradient_size != 7);
- ARM_COMPUTE_ERROR_ON(lower < 0 || lower >= upper);
-
- // Output: T == uint8_t
- SimpleTensor<T> dst{ src.shape(), src.data_type() };
- ValidRegion valid_region = shape_to_valid_region(src.shape(), border_mode == BorderMode::UNDEFINED, BorderSize(gradient_size / 2 + 1));
-
- // Sobel computation: U == int16_t or int32_t
- SimpleTensor<U> gx{};
- SimpleTensor<U> gy{};
- std::tie(gx, gy) = sobel<U>(src, gradient_size, border_mode, constant_border_value, GradientDimension::GRAD_XY);
-
- using unsigned_U = typename traits::make_unsigned_conditional_t<U>::type;
- using promoted_U = typename common_promoted_signed_type<U>::intermediate_type;
-
- // Gradient magnitude and phase (edge direction)
- const DataType mag_data_type = gx.data_type() == DataType::S16 ? DataType::U16 : DataType::U32;
- SimpleTensor<unsigned_U> grad_mag{ gx.shape(), mag_data_type };
- SimpleTensor<uint8_t> grad_dir{ gy.shape(), DataType::U8 };
-
- for(auto i = 0; i < grad_mag.num_elements(); ++i)
- {
- double mag = 0.f;
-
- if(norm_type == MagnitudeType::L2NORM)
- {
- mag = support::cpp11::round(std::sqrt(static_cast<promoted_U>(gx[i]) * gx[i] + static_cast<promoted_U>(gy[i]) * gy[i]));
- }
- else // MagnitudeType::L1NORM
- {
- mag = static_cast<promoted_U>(std::abs(gx[i])) + static_cast<promoted_U>(std::abs(gy[i]));
- }
-
- float angle = 180.f * std::atan2(static_cast<float>(gy[i]), static_cast<float>(gx[i])) / M_PI;
- grad_dir[i] = support::cpp11::round(angle < 0.f ? 180 + angle : angle);
- grad_mag[i] = saturate_cast<unsigned_U>(mag);
- }
-
- /*
- Quantise the phase into 4 directions
- 0° dir=0 0.0 <= p < 22.5 or 157.5 <= p < 180
- 45° dir=1 22.5 <= p < 67.5
- 90° dir=2 67.5 <= p < 112.5
- 135° dir=3 112.5 <= p < 157.5
- */
- for(auto i = 0; i < grad_dir.num_elements(); ++i)
- {
- const auto direction = std::fabs(grad_dir[i]);
- grad_dir[i] = (direction < 22.5 || direction >= 157.5) ? 0 : (direction < 67.5) ? 1 : (direction < 112.5) ? 2 : 3;
- }
-
- // Non-maximum suppression
- std::vector<int> strong_edges;
- const auto upper_thresh = static_cast<uint32_t>(upper);
- const auto lower_thresh = static_cast<uint32_t>(lower);
-
- const auto pixel_at_offset = [&](const SimpleTensor<unsigned_U> &tensor, const Coordinates & coord, int xoffset, int yoffset)
- {
- return tensor_elem_at(tensor, Coordinates{ coord.x() + xoffset, coord.y() + yoffset }, border_mode, static_cast<unsigned_U>(constant_border_value));
- };
-
- for(auto i = 0; i < dst.num_elements(); ++i)
- {
- const auto coord = index2coord(dst.shape(), i);
- if(!is_in_valid_region(valid_region, coord) || grad_mag[i] <= lower_thresh)
- {
- dst[i] = MARK_ZERO;
- continue;
- }
-
- unsigned_U mag_90;
- unsigned_U mag90;
- switch(grad_dir[i])
- {
- case 0: // North/South edge direction, compare against East/West pixels (left & right)
- mag_90 = pixel_at_offset(grad_mag, coord, -1, 0);
- mag90 = pixel_at_offset(grad_mag, coord, 1, 0);
- break;
- case 1: // NE/SW edge direction, compare against NW/SE pixels (top-left & bottom-right)
- mag_90 = pixel_at_offset(grad_mag, coord, -1, -1);
- mag90 = pixel_at_offset(grad_mag, coord, +1, +1);
- break;
- case 2: // East/West edge direction, compare against North/South pixels (top & bottom)
- mag_90 = pixel_at_offset(grad_mag, coord, 0, -1);
- mag90 = pixel_at_offset(grad_mag, coord, 0, +1);
- break;
- case 3: // NW/SE edge direction, compare against NE/SW pixels (top-right & bottom-left)
- mag_90 = pixel_at_offset(grad_mag, coord, +1, -1);
- mag90 = pixel_at_offset(grad_mag, coord, -1, +1);
- break;
- default:
- ARM_COMPUTE_ERROR("Invalid gradient phase provided");
- break;
- }
-
- // Potential edge if greater than both pixels at +/-90° on either side
- if(grad_mag[i] > mag_90 && grad_mag[i] > mag90)
- {
- // Double thresholding and edge tracing
- if(grad_mag[i] > upper_thresh)
- {
- dst[i] = MARK_EDGE; // Definite edge pixel
- strong_edges.emplace_back(i);
- }
- else
- {
- dst[i] = MARK_MAYBE;
- }
- }
- else
- {
- dst[i] = MARK_ZERO; // Since not greater than neighbours
- }
- }
-
- // Final edge tracing
- trace_edge<T>(dst, valid_region);
- return dst;
-}
-} // namespace
-
-template <typename T>
-SimpleTensor<T> canny_edge_detector(const SimpleTensor<T> &src,
- int32_t upper_thresh, int32_t lower_thresh, int gradient_size, MagnitudeType norm_type,
- BorderMode border_mode, T constant_border_value)
-{
- if(gradient_size < 7)
- {
- return canny_edge_detector_impl<int16_t>(src, upper_thresh, lower_thresh, gradient_size, norm_type, border_mode, constant_border_value);
- }
- else
- {
- return canny_edge_detector_impl<int32_t>(src, upper_thresh, lower_thresh, gradient_size, norm_type, border_mode, constant_border_value);
- }
-}
-
-template SimpleTensor<uint8_t> canny_edge_detector(const SimpleTensor<uint8_t> &src,
- int32_t upper_thresh, int32_t lower_thresh, int gradient_size, MagnitudeType norm_type,
- BorderMode border_mode, uint8_t constant_border_value);
-} // namespace reference
-} // namespace validation
-} // namespace test
-} // namespace arm_compute
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