1 /*
2 * Copyright (c) 2017-2020 Arm Limited.
3 *
4 * SPDX-License-Identifier: MIT
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in all
14 * copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 */
24 #include "Erode.h"
25
26 #include "Utils.h"
27 #include "tests/validation/Helpers.h"
28
29 #include <algorithm>
30 #include <array>
31
32 namespace arm_compute
33 {
34 namespace test
35 {
36 namespace validation
37 {
38 namespace reference
39 {
40 template <typename T>
erode(const SimpleTensor<T> & src,BorderMode border_mode,T constant_border_value)41 SimpleTensor<T> erode(const SimpleTensor<T> &src, BorderMode border_mode, T constant_border_value)
42 {
43 /*
44 -1 x +1
45 -1 [tl][tc][tr] -1
46 y [ml][xy][mr] y
47 +1 [bl][bc][br] +1
48 -1 x +1
49 erode:
50 dst(x, y) = min[ src(x', y') for x-1<=x'<=x+1, y-1<=y'<=y+1 ] = min({tl, tc, tr, ml, xy, mr, bl, bc, br})
51 */
52 SimpleTensor<T> dst(src.shape(), src.data_type());
53
54 const uint32_t num_elements = src.num_elements();
55 #if defined(_OPENMP)
56 #pragma omp parallel for
57 #endif /* _OPENMP */
58 for(uint32_t i = 0; i < num_elements; ++i)
59 {
60 Coordinates coord = index2coord(src.shape(), i);
61 const int x = coord.x();
62 const int y = coord.y();
63
64 std::array<T, 9> neighbours = { { 0 } };
65 for(int row = y - 1, j = 0; row <= y + 1; ++row)
66 {
67 for(int col = x - 1; col <= x + 1; ++col, ++j)
68 {
69 coord.set(0, col);
70 coord.set(1, row);
71 neighbours[j] = tensor_elem_at(src, coord, border_mode, constant_border_value);
72 }
73 }
74
75 dst[i] = *std::min_element(neighbours.cbegin(), neighbours.cend());
76 }
77
78 return dst;
79 }
80
81 template SimpleTensor<uint8_t> erode(const SimpleTensor<uint8_t> &src, BorderMode border_mode, uint8_t constant_border_value);
82 } // namespace reference
83 } // namespace validation
84 } // namespace test
85 } // namespace arm_compute
86