Compute Library
 21.08
NonMaximaSuppression.cpp
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24 #include "NonMaximaSuppression.h"
25 
26 #include "Utils.h"
28 
29 namespace arm_compute
30 {
31 namespace test
32 {
33 namespace validation
34 {
35 namespace reference
36 {
37 template <typename T>
38 SimpleTensor<T> non_maxima_suppression(const SimpleTensor<T> &src, BorderMode border_mode, T constant_border_value)
39 {
40  constexpr int block_size = 3;
41  SimpleTensor<T> dst(src.shape(), src.data_type(), src.num_channels());
42  ValidRegion valid_region = shape_to_valid_region(src.shape(), border_mode == BorderMode::UNDEFINED, BorderSize(block_size / 2));
43 
44  const uint32_t num_elements = src.num_elements();
45  for(uint32_t i = 0; i < num_elements; ++i)
46  {
47  Coordinates coord = index2coord(src.shape(), i);
48  int x = coord.x();
49  int y = coord.y();
50 
51  if(!is_in_valid_region(valid_region, coord))
52  {
53  continue;
54  }
55 
56  if(src[i] >= tensor_elem_at(src, Coordinates(x - 1, y - 1), border_mode, constant_border_value) && src[i] >= tensor_elem_at(src, Coordinates(x, y - 1), border_mode, constant_border_value)
57  && src[i] >= tensor_elem_at(src, Coordinates(x + 1, y - 1), border_mode, constant_border_value) && src[i] >= tensor_elem_at(src, Coordinates(x - 1, y), border_mode, constant_border_value)
58  && src[i] > tensor_elem_at(src, Coordinates(x + 1, y), border_mode, constant_border_value) && src[i] > tensor_elem_at(src, Coordinates(x - 1, y + 1), border_mode, constant_border_value)
59  && src[i] > tensor_elem_at(src, Coordinates(x, y + 1), border_mode, constant_border_value) && src[i] > tensor_elem_at(src, Coordinates(x + 1, y + 1), border_mode, constant_border_value))
60  {
61  dst[i] = src[i];
62  }
63  else
64  {
65  dst[i] = T(0);
66  }
67  }
68 
69  return dst;
70 }
71 
72 template SimpleTensor<float> non_maxima_suppression(const SimpleTensor<float> &src, BorderMode border_mode, float constant_border_value);
73 template SimpleTensor<uint8_t> non_maxima_suppression(const SimpleTensor<uint8_t> &src, BorderMode border_mode, uint8_t constant_border_value);
74 } // namespace reference
75 } // namespace validation
76 } // namespace test
77 } // namespace arm_compute
BorderMode
Methods available to handle borders.
Definition: Types.h:256
T tensor_elem_at(const SimpleTensor< T > &src, Coordinates coord, BorderMode border_mode, T constant_border_value)
Definition: Utils.h:63
Container for 2D border size.
Definition: Types.h:264
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
const ValidRegion valid_region
Definition: Scale.cpp:223
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
bool is_in_valid_region(const ValidRegion &valid_region, Coordinates coord)
Check if a coordinate is within a valid region.
Definition: Utils.h:405
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_channels() const override
Number of channels of the tensor.
Definition: SimpleTensor.h:370
SimpleTensor< T > non_maxima_suppression(const SimpleTensor< T > &src, BorderMode border_mode, T constant_border_value)
Borders are left undefined.
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
Container for valid region of a window.
Definition: Types.h:179
ValidRegion shape_to_valid_region(const TensorShape &a_shape, bool border_undefined=false, BorderSize border_size=BorderSize(0))
Create a valid region based on tensor shape, border mode and border size.
Definition: Utils.h:218