NumCpp  2.7.0
A Templatized Header Only C++ Implementation of the Python NumPy Library
reflect2d.hpp
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1 #pragma once
29 
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  namespace boundary
42  {
43  //============================================================================
44  // Method Description:
52  template<typename dtype>
53  NdArray<dtype> reflect2d(const NdArray<dtype>& inImage, uint32 inBoundarySize)
54  {
56 
57  const Shape inShape = inImage.shape();
58  Shape outShape(inShape);
59  outShape.rows += inBoundarySize * 2;
60  outShape.cols += inBoundarySize * 2;
61 
62  NdArray<dtype> outArray(outShape);
63  outArray.put(Slice(inBoundarySize, inBoundarySize + inShape.rows),
64  Slice(inBoundarySize, inBoundarySize + inShape.cols), inImage);
65 
66  for (uint32 row = 0; row < inBoundarySize; ++row)
67  {
68  // bottom
69  outArray.put(row,
70  Slice(inBoundarySize, inBoundarySize + inShape.cols),
71  inImage(inBoundarySize - row - 1, Slice(0, inShape.cols)));
72 
73  // top
74  outArray.put(row + inBoundarySize + inShape.rows,
75  Slice(inBoundarySize, inBoundarySize + inShape.cols),
76  inImage(inShape.rows - row - 1, Slice(0, inShape.cols)));
77  }
78 
79  for (uint32 col = 0; col < inBoundarySize; ++col)
80  {
81  // left
82  outArray.put(Slice(inBoundarySize, inBoundarySize + inShape.rows),
83  col,
84  inImage(Slice(0, inShape.rows), inBoundarySize - col - 1));
85 
86  // right
87  outArray.put(Slice(inBoundarySize, inBoundarySize + inShape.rows),
88  col + inBoundarySize + inShape.cols,
89  inImage(Slice(0, inShape.rows), inShape.cols - col - 1));
90  }
91 
92  // now fill in the corners
93  NdArray<dtype> lowerLeft = flipud(outArray(Slice(inBoundarySize, 2 * inBoundarySize),
94  Slice(0, inBoundarySize)));
95  NdArray<dtype> lowerRight = flipud(outArray(Slice(inBoundarySize, 2 * inBoundarySize),
96  Slice(outShape.cols - inBoundarySize, outShape.cols)));
97 
98  const uint32 upperRowStart = outShape.rows - 2 * inBoundarySize;
99  NdArray<dtype> upperLeft = flipud(outArray(Slice(upperRowStart, upperRowStart + inBoundarySize),
100  Slice(0, inBoundarySize)));
101  NdArray<dtype> upperRight = flipud(outArray(Slice(upperRowStart, upperRowStart + inBoundarySize),
102  Slice(outShape.cols - inBoundarySize, outShape.cols)));
103 
104  outArray.put(Slice(0, inBoundarySize), Slice(0, inBoundarySize), lowerLeft);
105  outArray.put(Slice(0, inBoundarySize), Slice(outShape.cols - inBoundarySize, outShape.cols), lowerRight);
106  outArray.put(Slice(outShape.rows - inBoundarySize, outShape.rows),
107  Slice(0, inBoundarySize), upperLeft);
108  outArray.put(Slice(outShape.rows - inBoundarySize, outShape.rows),
109  Slice(outShape.cols - inBoundarySize, outShape.cols), upperRight);
110 
111  return outArray;
112  }
113  } // namespace boundary
114  } // namespace filter
115 } // namespace nc
#define STATIC_ASSERT_ARITHMETIC(dtype)
Definition: StaticAsserts.hpp:37
Holds 1D and 2D arrays, the main work horse of the NumCpp library.
Definition: NdArrayCore.hpp:72
NdArray< dtype > & put(int32 inIndex, value_type inValue)
Definition: NdArrayCore.hpp:3666
Shape shape() const noexcept
Definition: NdArrayCore.hpp:4283
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 > reflect2d(const NdArray< dtype > &inImage, uint32 inBoundarySize)
Definition: reflect2d.hpp:53
Definition: Coordinate.hpp:45
NdArray< dtype > flipud(const NdArray< dtype > &inArray)
Definition: flipud.hpp:46
std::uint32_t uint32
Definition: Types.hpp:40