1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/*
* Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef otbUniformAlphaBlendingFunctor_h
#define otbUniformAlphaBlendingFunctor_h
#include "itkMacro.h"
#include "itkNumericTraits.h"
#include "otbMath.h"
namespace otb
{
namespace Functor
{
/**
* \class UniformAlphaBlendingFunctor
* \brief Implements simple blending
* For each channel the blending function is as follows:
* \f[ P_{o} = \alpha P_{i1} + (1 - \alpha) P_{i2} \f]
*
* \ingroup OTBCommon
*/
template <class TInputPixel, class TInputPixel2, class TOutputPixel>
class ITK_EXPORT UniformAlphaBlendingFunctor
{
public:
UniformAlphaBlendingFunctor() : m_Alpha(0.5)
{
}
~UniformAlphaBlendingFunctor()
{
}
typedef TInputPixel InputPixelType;
typedef TInputPixel2 InputPixel2Type;
typedef TOutputPixel OutputPixelType;
typedef typename OutputPixelType::ValueType OutputInternalPixelType;
void SetAlpha(double a)
{
// Keep alpha between 0 and 1
m_Alpha = a < 0.0 ? 0.0 : (a > 1.0 ? 1.0 : a);
}
double GetAlpha() const
{
return m_Alpha;
}
inline OutputPixelType operator()(InputPixelType input1, InputPixel2Type input2) const
{
OutputPixelType resp;
resp.Fill(itk::NumericTraits<OutputInternalPixelType>::max());
resp.SetRed(static_cast<OutputInternalPixelType>(
std::floor(m_Alpha * static_cast<double>(input1.GetRed()) + (1 - m_Alpha) * static_cast<double>(input2.GetRed()) + 0.5)));
resp.SetGreen(static_cast<OutputInternalPixelType>(
std::floor(m_Alpha * static_cast<double>(input1.GetGreen()) + (1 - m_Alpha) * static_cast<double>(input2.GetGreen()) + 0.5)));
resp.SetBlue(static_cast<OutputInternalPixelType>(
std::floor(m_Alpha * static_cast<double>(input1.GetBlue()) + (1 - m_Alpha) * static_cast<double>(input2.GetBlue()) + 0.5)));
return resp;
}
protected:
double m_Alpha;
};
}
}
#endif
|
