NumCpp  2.7.0
A Templatized Header Only C++ Implementation of the Python NumPy Library
minimumFilter.hpp
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1 #pragma once
29 
30 #include "NumCpp/Core/Shape.hpp"
31 #include "NumCpp/Core/Slice.hpp"
32 #include "NumCpp/Core/Types.hpp"
34 #include "NumCpp/NdArray.hpp"
35 
36 namespace nc
37 {
38  namespace filter
39  {
40  //============================================================================
41  // Method Description:
52  template<typename dtype>
53  NdArray<dtype> minimumFilter(const NdArray<dtype>& inImageArray, uint32 inSize,
54  Boundary inBoundaryType = Boundary::REFLECT, dtype inConstantValue = 0)
55  {
56  NdArray<dtype> arrayWithBoundary = boundary::addBoundary2d(inImageArray, inBoundaryType, inSize, inConstantValue);
57  NdArray<dtype> output(inImageArray.shape());
58 
59  const Shape inShape = inImageArray.shape();
60  const uint32 boundarySize = inSize / 2; // integer division
61  const uint32 endPointRow = boundarySize + inShape.rows;
62  const uint32 endPointCol = boundarySize + inShape.cols;
63 
64  for (uint32 row = boundarySize; row < endPointRow; ++row)
65  {
66  for (uint32 col = boundarySize; col < endPointCol; ++col)
67  {
68  NdArray<dtype> window = arrayWithBoundary(Slice(row - boundarySize, row + boundarySize + 1),
69  Slice(col - boundarySize, col + boundarySize + 1));
70 
71  output(row - boundarySize, col - boundarySize) = window.min().item();
72  }
73  }
74 
75  return output;
76  }
77  } // namespace filter
78 } // namespace nc
Holds 1D and 2D arrays, the main work horse of the NumCpp library.
Definition: NdArrayCore.hpp:72
Shape shape() const noexcept
Definition: NdArrayCore.hpp:4283
NdArray< dtype > min(Axis inAxis=Axis::NONE) const
Definition: NdArrayCore.hpp:3005
A Shape Class for NdArrays.
Definition: Core/Shape.hpp:41
uint32 rows
Definition: Core/Shape.hpp:44
uint32 cols
Definition: Core/Shape.hpp:45
A Class for slicing into NdArrays.
Definition: Slice.hpp:44
NdArray< dtype > addBoundary2d(const NdArray< dtype > &inImage, Boundary inBoundaryType, uint32 inKernalSize, dtype inConstantValue=0)
Definition: addBoundary2d.hpp:60
NdArray< dtype > minimumFilter(const NdArray< dtype > &inImageArray, uint32 inSize, Boundary inBoundaryType=Boundary::REFLECT, dtype inConstantValue=0)
Definition: minimumFilter.hpp:53
Boundary
Boundary condition to apply to the image filter.
Definition: Boundary.hpp:37
Definition: Coordinate.hpp:45
std::uint32_t uint32
Definition: Types.hpp:40