NumCpp  2.12.1
A Templatized Header Only C++ Implementation of the Python NumPy Library
reflect2d.hpp
Go to the documentation of this file.
1
28#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
38{
39 //============================================================================
40 // Method Description:
48 template<typename dtype>
49 NdArray<dtype> reflect2d(const NdArray<dtype>& inImage, uint32 inBoundarySize)
50 {
52
53 const Shape inShape = inImage.shape();
54 Shape outShape(inShape);
55 outShape.rows += inBoundarySize * 2;
56 outShape.cols += inBoundarySize * 2;
57
58 NdArray<dtype> outArray(outShape);
59 outArray.put(Slice(inBoundarySize, inBoundarySize + inShape.rows),
60 Slice(inBoundarySize, inBoundarySize + inShape.cols),
61 inImage);
62
63 for (uint32 row = 0; row < inBoundarySize; ++row)
64 {
65 // bottom
66 outArray.put(row,
67 Slice(inBoundarySize, inBoundarySize + inShape.cols),
68 inImage(inBoundarySize - row - 1, Slice(0, inShape.cols)));
69
70 // top
71 outArray.put(row + inBoundarySize + inShape.rows,
72 Slice(inBoundarySize, inBoundarySize + inShape.cols),
73 inImage(inShape.rows - row - 1, Slice(0, inShape.cols)));
74 }
75
76 for (uint32 col = 0; col < inBoundarySize; ++col)
77 {
78 // left
79 outArray.put(Slice(inBoundarySize, inBoundarySize + inShape.rows),
80 col,
81 inImage(Slice(0, inShape.rows), inBoundarySize - col - 1));
82
83 // right
84 outArray.put(Slice(inBoundarySize, inBoundarySize + inShape.rows),
85 col + inBoundarySize + inShape.cols,
86 inImage(Slice(0, inShape.rows), inShape.cols - col - 1));
87 }
88
89 // now fill in the corners
90 NdArray<dtype> lowerLeft =
91 flipud(outArray(Slice(inBoundarySize, 2 * inBoundarySize), Slice(0, inBoundarySize)));
92 NdArray<dtype> lowerRight = flipud(
93 outArray(Slice(inBoundarySize, 2 * inBoundarySize), Slice(outShape.cols - inBoundarySize, outShape.cols)));
94
95 const uint32 upperRowStart = outShape.rows - 2 * inBoundarySize;
96 NdArray<dtype> upperLeft =
97 flipud(outArray(Slice(upperRowStart, upperRowStart + inBoundarySize), Slice(0, inBoundarySize)));
98 NdArray<dtype> upperRight = flipud(outArray(Slice(upperRowStart, upperRowStart + inBoundarySize),
99 Slice(outShape.cols - inBoundarySize, outShape.cols)));
100
101 outArray.put(Slice(0, inBoundarySize), Slice(0, inBoundarySize), lowerLeft);
102 outArray.put(Slice(0, inBoundarySize), Slice(outShape.cols - inBoundarySize, outShape.cols), lowerRight);
103 outArray.put(Slice(outShape.rows - inBoundarySize, outShape.rows), Slice(0, inBoundarySize), upperLeft);
104 outArray.put(Slice(outShape.rows - inBoundarySize, outShape.rows),
105 Slice(outShape.cols - inBoundarySize, outShape.cols),
106 upperRight);
107
108 return outArray;
109 }
110} // namespace nc::filter::boundary
#define STATIC_ASSERT_ARITHMETIC(dtype)
Definition: StaticAsserts.hpp:39
Holds 1D and 2D arrays, the main work horse of the NumCpp library.
Definition: NdArrayCore.hpp:139
const Shape & shape() const noexcept
Definition: NdArrayCore.hpp:4511
self_type & put(index_type inIndex, const value_type &inValue)
Definition: NdArrayCore.hpp:3693
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
Definition: addBoundary1d.hpp:44
NdArray< dtype > reflect2d(const NdArray< dtype > &inImage, uint32 inBoundarySize)
Definition: reflect2d.hpp:49
NdArray< dtype > flipud(const NdArray< dtype > &inArray)
Definition: flipud.hpp:46
std::uint32_t uint32
Definition: Types.hpp:40