NumCpp  2.11.0
A Templatized Header Only C++ Implementation of the Python NumPy Library
percentileFilter.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"
35 #include "NumCpp/NdArray.hpp"
36 
37 namespace nc::filter
38 {
39  //============================================================================
40  // Method Description:
53  template<typename dtype>
55  uint32 inSize,
56  double inPercentile,
57  Boundary inBoundaryType = Boundary::REFLECT,
58  dtype inConstantValue = 0)
59  {
60  NdArray<dtype> arrayWithBoundary =
61  boundary::addBoundary2d(inImageArray, inBoundaryType, inSize, inConstantValue);
62  NdArray<dtype> output(inImageArray.shape());
63 
64  const Shape inShape = inImageArray.shape();
65  const uint32 boundarySize = inSize / 2; // integer division
66  const uint32 endPointRow = boundarySize + inShape.rows;
67  const uint32 endPointCol = boundarySize + inShape.cols;
68 
69  for (uint32 row = boundarySize; row < endPointRow; ++row)
70  {
71  for (uint32 col = boundarySize; col < endPointCol; ++col)
72  {
73  NdArray<dtype> window = arrayWithBoundary(Slice(row - boundarySize, row + boundarySize + 1),
74  Slice(col - boundarySize, col + boundarySize + 1));
75 
76  output(row - boundarySize, col - boundarySize) =
77  percentile(window, inPercentile, Axis::NONE, "nearest").item();
78  }
79  }
80 
81  return output;
82  }
83 } // namespace nc::filter
Holds 1D and 2D arrays, the main work horse of the NumCpp library.
Definition: NdArrayCore.hpp:138
value_type item() const
Definition: NdArrayCore.hpp:2975
const Shape & shape() const noexcept
Definition: NdArrayCore.hpp:4464
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:45
NdArray< dtype > addBoundary2d(const NdArray< dtype > &inImage, Boundary inBoundaryType, uint32 inKernalSize, dtype inConstantValue=0)
Definition: addBoundary2d.hpp:56
Definition: addBoundary1d.hpp:44
NdArray< dtype > percentileFilter(const NdArray< dtype > &inImageArray, uint32 inSize, double inPercentile, Boundary inBoundaryType=Boundary::REFLECT, dtype inConstantValue=0)
Definition: percentileFilter.hpp:54
Boundary
Boundary condition to apply to the image filter.
Definition: Boundary.hpp:36
NdArray< double > percentile(const NdArray< dtype > &inArray, double inPercentile, Axis inAxis=Axis::NONE, const std::string &inInterpMethod="linear")
Definition: percentile.hpp:65
std::uint32_t uint32
Definition: Types.hpp:40