NumCpp  2.1.0
A C++ implementation of the Python Numpy library
medianFilter.hpp
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1 #pragma once
30 
31 #include "NumCpp/Core/Shape.hpp"
32 #include "NumCpp/Core/Slice.hpp"
33 #include "NumCpp/Core/Types.hpp"
35 #include "NumCpp/NdArray.hpp"
36 
37 namespace nc
38 {
39  namespace filter
40  {
41  //============================================================================
42  // Method Description:
54  template<typename dtype>
55  NdArray<dtype> medianFilter(const NdArray<dtype>& inImageArray, uint32 inSize,
56  Boundary inBoundaryType = Boundary::REFLECT, dtype inConstantValue = 0)
57  {
58  NdArray<dtype> arrayWithBoundary = boundary::addBoundary2d(inImageArray, inBoundaryType, inSize, inConstantValue);
59  NdArray<dtype> output(inImageArray.shape());
60 
61  const Shape inShape = inImageArray.shape();
62  const uint32 boundarySize = inSize / 2; // integer division
63  const uint32 endPointRow = boundarySize + inShape.rows;
64  const uint32 endPointCol = boundarySize + inShape.cols;
65 
66  for (uint32 row = boundarySize; row < endPointRow; ++row)
67  {
68  for (uint32 col = boundarySize; col < endPointCol; ++col)
69  {
70  NdArray<dtype> window = arrayWithBoundary(Slice(row - boundarySize, row + boundarySize + 1),
71  Slice(col - boundarySize, col + boundarySize + 1));
72 
73  output(row - boundarySize, col - boundarySize) = window.median().item();
74  }
75  }
76 
77  return output;
78  }
79  } // namespace filter
80 } // namespace nc
nc::NdArray::item
value_type item() const
Definition: NdArrayCore.hpp:2958
nc::NdArray::shape
Shape shape() const noexcept
Definition: NdArrayCore.hpp:4312
nc::NdArray< dtype >
nc::uint32
std::uint32_t uint32
Definition: Types.hpp:41
NdArray.hpp
nc::Shape
A Shape Class for NdArrays.
Definition: Core/Shape.hpp:41
nc::Shape::cols
uint32 cols
Definition: Core/Shape.hpp:46
nc::filter::medianFilter
NdArray< dtype > medianFilter(const NdArray< dtype > &inImageArray, uint32 inSize, Boundary inBoundaryType=Boundary::REFLECT, dtype inConstantValue=0)
Definition: medianFilter.hpp:55
nc::filter::boundary::addBoundary2d
NdArray< dtype > addBoundary2d(const NdArray< dtype > &inImage, Boundary inBoundaryType, uint32 inKernalSize, dtype inConstantValue=0)
Definition: addBoundary2d.hpp:62
Shape.hpp
nc::filter::Boundary::REFLECT
@ REFLECT
nc
Definition: Coordinate.hpp:45
nc::Shape::rows
uint32 rows
Definition: Core/Shape.hpp:45
nc::filter::Boundary
Boundary
Boundary condition to apply to the image filter.
Definition: Boundary.hpp:38
Types.hpp
nc::Slice
A Class for slicing into NdArrays.
Definition: Slice.hpp:44
nc::NdArray::median
NdArray< dtype > median(Axis inAxis=Axis::NONE) const
Definition: NdArrayCore.hpp:3095
Slice.hpp
addBoundary2d.hpp