| /* |
| * 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 "Phase.h" |
| |
| namespace arm_compute |
| { |
| namespace test |
| { |
| namespace validation |
| { |
| namespace reference |
| { |
| template <typename T> |
| SimpleTensor<uint8_t> phase(const SimpleTensor<T> &gx, const SimpleTensor<T> &gy, PhaseType phase_type) |
| { |
| const float pi = std::atan(1) * 4; |
| const float rad_to_deg = 180.0f / pi; |
| const float scale_factor = 128.f / 180.f; |
| const float epsilon = 1e-9f; // used to avoid division by zero |
| |
| const float ninety = scale_factor * 90.f; |
| const float one_eighty = scale_factor * 180.f; |
| const float two_seventy = scale_factor * 270.f; |
| |
| // unsigned: map to [0-255) |
| // signed: map to [0-180) degrees |
| const float scale = (phase_type == PhaseType::UNSIGNED) ? rad_to_deg : rad_to_deg * scale_factor; |
| |
| SimpleTensor<uint8_t> phase(gx.shape(), DataType::U8); |
| |
| for(int i = 0; i < gx.num_elements(); ++i) |
| { |
| bool quad_two = std::signbit(gx[i]) && !std::signbit(gy[i]); |
| bool quad_three = std::signbit(gx[i]) && std::signbit(gy[i]); |
| bool quad_four = !std::signbit(gx[i]) && std::signbit(gy[i]); |
| |
| float x = gy[i] / (gx[i] + epsilon); |
| double arctan = std::atan(x); |
| |
| const bool is_negative = std::signbit(arctan); |
| |
| // Radians to degrees conversion with applied scale factor |
| arctan = arctan * scale; |
| |
| if(phase_type == PhaseType::UNSIGNED) |
| { |
| arctan = is_negative ? arctan + 180.f : arctan; |
| } |
| else |
| { |
| arctan = is_negative ? arctan + ninety : arctan; |
| |
| // Choose correct quandrant |
| arctan = quad_two ? ninety + arctan : arctan; |
| arctan = quad_three ? one_eighty + arctan : arctan; |
| arctan = quad_four ? two_seventy + arctan : arctan; |
| } |
| |
| phase[i] = saturate_cast<uint8_t>(arctan + 0.5f); |
| } |
| |
| return phase; |
| } |
| |
| template SimpleTensor<uint8_t> phase(const SimpleTensor<int16_t> &gx, const SimpleTensor<int16_t> &gy, PhaseType phase_type); |
| template SimpleTensor<uint8_t> phase(const SimpleTensor<int32_t> &gx, const SimpleTensor<int32_t> &gy, PhaseType phase_type); |
| } // namespace reference |
| } // namespace validation |
| } // namespace test |
| } // namespace arm_compute |