SourceXtractorPlusPlus  0.10
Please provide a description of the project.
CompactModelBase.icpp
Go to the documentation of this file.
1 /*
2  * CompactModelBase.icpp
3  *
4  * Created on: Aug 19, 2019
5  * Author: mschefer
6  */
7 
8 namespace ModelFitting {
9 
10 template<typename ImageType>
11 CompactModelBase<ImageType>::CompactModelBase(
12  std::shared_ptr<BasicParameter> x_scale, std::shared_ptr<BasicParameter> y_scale,
13  std::shared_ptr<BasicParameter> rotation, double width, double height,
14  std::shared_ptr<BasicParameter> x, std::shared_ptr<BasicParameter> y,
15  std::tuple<double, double, double, double> transform)
16  : ExtendedModel<ImageType>({}, x_scale, y_scale, rotation, width, height, x, y),
17  m_x_scale(x_scale), m_y_scale(y_scale), m_rotation(rotation)
18 {
19  m_jacobian = Mat22(transform).GetTranspose();
20  m_inv_jacobian = m_jacobian.GetInverse();
21 }
22 
23 template<typename ImageType>
24 Mat22 CompactModelBase<ImageType>::getCombinedTransform(double pixel_scale) const {
25  double s, c;
26 #ifdef _GNU_SOURCE
27  sincos(m_rotation->getValue(), &s, &c);
28 #else
29  s = sin(m_rotation->getValue());
30  c = cos(m_rotation->getValue());
31 #endif
32 
33  Mat22 rotation(
34  c, s,
35  -s, c);
36 
37  Mat22 scale(
38  1. / m_x_scale->getValue(), 0.0,
39  0.0, 1. / m_y_scale->getValue());
40 
41  return scale * rotation * m_inv_jacobian * pixel_scale;
42 }
43 
44 template<typename ImageType>
45 template<typename ModelEvaluator>
46 inline float CompactModelBase<ImageType>::samplePixel(const ModelEvaluator& model_eval, int x, int y, unsigned int subsampling) const {
47  double acc = 0.;
48  for (std::size_t ix=0; ix<subsampling; ++ix) {
49  float x_model = (x - 0.5 + (ix+1) * 1.0 / (subsampling+1));
50  for (std::size_t iy=0; iy<subsampling; ++iy) {
51  float y_model = (y - 0.5 + (iy+1) * 1.0 / (subsampling+1));
52  acc += model_eval.evaluateModel(x_model, y_model);
53  }
54  }
55 
56  return acc / (subsampling*subsampling);
57 }
58 
59 template<typename ImageType>
60 template<typename ModelEvaluator>
61 inline float CompactModelBase<ImageType>::adaptiveSamplePixel(const ModelEvaluator& model_eval, int x, int y, unsigned int max_subsampling, float threshold) const {
62  float value = samplePixel(model_eval, x,y, 1);
63  for (unsigned int i=2; i<=max_subsampling; i+=2) {
64  float newValue = samplePixel(model_eval, x,y, i);
65  float ratio = newValue / value;
66  if (ratio < threshold && ratio > 1.0 / threshold) {
67  value = newValue;
68  break;
69  }
70  value = newValue;
71  }
72 
73  return value;
74 }
75 
76 }