NumCpp  2.6.2
A Templatized Header Only C++ Implementation of the Python NumPy Library
minimumFilter.hpp
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1 
28 #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:
53  template<typename dtype>
54  NdArray<dtype> minimumFilter(const NdArray<dtype>& inImageArray, uint32 inSize,
55  Boundary inBoundaryType = Boundary::REFLECT, dtype inConstantValue = 0)
56  {
57  NdArray<dtype> arrayWithBoundary = boundary::addBoundary2d(inImageArray, inBoundaryType, inSize, inConstantValue);
58  NdArray<dtype> output(inImageArray.shape());
59 
60  const Shape inShape = inImageArray.shape();
61  const uint32 boundarySize = inSize / 2; // integer division
62  const uint32 endPointRow = boundarySize + inShape.rows;
63  const uint32 endPointCol = boundarySize + inShape.cols;
64 
65  for (uint32 row = boundarySize; row < endPointRow; ++row)
66  {
67  for (uint32 col = boundarySize; col < endPointCol; ++col)
68  {
69  NdArray<dtype> window = arrayWithBoundary(Slice(row - boundarySize, row + boundarySize + 1),
70  Slice(col - boundarySize, col + boundarySize + 1));
71 
72  output(row - boundarySize, col - boundarySize) = window.min().item();
73  }
74  }
75 
76  return output;
77  }
78  } // namespace filter
79 } // 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:4483
NdArray< dtype > min(Axis inAxis=Axis::NONE) const
Definition: NdArrayCore.hpp:3180
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:61
NdArray< dtype > minimumFilter(const NdArray< dtype > &inImageArray, uint32 inSize, Boundary inBoundaryType=Boundary::REFLECT, dtype inConstantValue=0)
Definition: minimumFilter.hpp:54
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