Compute Library
 21.08
Erode.cpp
Go to the documentation of this file.
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"
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>
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
BorderMode
Methods available to handle borders.
Definition: Types.h:256
void set(size_t dimension, T value, bool increase_dim_unit=true)
Accessor to set the value of one of the dimensions.
Definition: Dimensions.h:76
T tensor_elem_at(const SimpleTensor< T > &src, Coordinates coord, BorderMode border_mode, T constant_border_value)
Definition: Utils.h:63
DataType data_type() const override
Data type of the tensor.
Definition: SimpleTensor.h:357
TensorShape shape() const override
Shape of the tensor.
Definition: SimpleTensor.h:320
SimpleTensor< T > erode(const SimpleTensor< T > &src, BorderMode border_mode, T constant_border_value)
Definition: Erode.cpp:41
SimpleTensor< float > src
Definition: DFT.cpp:155
Copyright (c) 2017-2021 Arm Limited.
T x() const
Alias to access the size of the first dimension.
Definition: Dimensions.h:87
Coordinates of an item.
Definition: Coordinates.h:37
Coordinates index2coord(const TensorShape &shape, int index)
Convert a linear index into n-dimensional coordinates.
Definition: Utils.h:358
Simple tensor object that stores elements in a consecutive chunk of memory.
Definition: SimpleTensor.h:58
int num_elements() const override
Number of elements of the tensor.
Definition: SimpleTensor.h:406
T y() const
Alias to access the size of the second dimension.
Definition: Dimensions.h:92