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
86
87
88
89
90
91
92
93
94
95
96
97
|
/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* 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 itkRegistrationParameterScalesFromPhysicalShift_hxx
#define itkRegistrationParameterScalesFromPhysicalShift_hxx
namespace itk
{
template <typename TMetric>
void
RegistrationParameterScalesFromPhysicalShift<TMetric>::ComputeSampleShifts(const ParametersType & deltaParameters,
ScalesType & sampleShifts)
{
if (this->GetTransformForward())
{
this->ComputeSampleShiftsInternal<MovingTransformType>(deltaParameters, sampleShifts);
}
else
{
this->ComputeSampleShiftsInternal<FixedTransformType>(deltaParameters, sampleShifts);
}
}
template <typename TMetric>
template <typename TTransform>
void
RegistrationParameterScalesFromPhysicalShift<TMetric>::ComputeSampleShiftsInternal(
const ParametersType & deltaParameters,
ScalesType & sampleShifts)
{
using TransformOutputType = typename TTransform::OutputPointType;
// We save the old parameters and apply the delta parameters to calculate the
// voxel shift. After it is done, we will reset to the old parameters.
auto * transform = const_cast<TransformBaseTemplate<typename TMetric::MeasureType> *>(this->GetTransform());
const ParametersType oldParameters = transform->GetParameters();
const auto numSamples = static_cast<const SizeValueType>(this->m_SamplePoints.size());
VirtualPointType point;
TransformOutputType newMappedVoxel;
// store the old mapped indices to reduce calls to Transform::SetParameters()
std::vector<TransformOutputType> oldMappedVoxels(numSamples);
sampleShifts.SetSize(numSamples);
// compute the indices mapped by the old transform
for (SizeValueType c = 0; c < numSamples; ++c)
{
point = this->m_SamplePoints[c];
this->template TransformPoint<TransformOutputType>(point, oldMappedVoxels[c]);
}
// Apply the delta parameters to the transform
this->UpdateTransformParameters(deltaParameters);
// compute the indices mapped by the new transform
for (SizeValueType c = 0; c < numSamples; ++c)
{
point = this->m_SamplePoints[c];
this->template TransformPoint<TransformOutputType>(point, newMappedVoxel);
// find the local shift for each sample point
sampleShifts[c] = newMappedVoxel.EuclideanDistanceTo(oldMappedVoxels[c]);
}
// restore the parameters in the transform
transform->SetParameters(oldParameters);
}
/** Print the information about this class */
template <typename TMetric>
void
RegistrationParameterScalesFromPhysicalShift<TMetric>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
}
} // namespace itk
#endif
|
