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annotate trajectorymanagement/src/LCSMetric.h @ 1250:77fbd0e2ba7d
dltrack works with moving average filtering
author | Nicolas Saunier <nicolas.saunier@polymtl.ca> |
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date | Thu, 15 Feb 2024 22:04:35 -0500 |
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rev | line source |
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1 #ifndef LCSMETRIC_H_ |
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2 #define LCSMETRIC_H_ |
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3 |
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4 #include "Metric.h" |
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5 |
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6 /** |
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7 * LCSMetric class. |
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8 * |
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9 * The Longest Common Subsequence metric |
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10 * This class mesures : |
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11 * 1) the similarity (number of points in "common", ie relative to distance similarity threshold) ; |
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12 * 2) the normalized distance between two trajectories |
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13 */ |
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14 |
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15 template<typename Tr, typename To> |
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16 class LCSMetric: public Metric<Tr, To> |
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17 { |
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18 public: |
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19 /** |
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20 * Constructor. |
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21 */ |
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22 LCSMetric() : similarityThreshold(0.0), eps(1e-6) |
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23 { |
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24 } |
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25 |
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26 /** |
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27 * Set similarity threshold between two points. |
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28 * |
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29 * @param[in] similarityThreshold similarity threshold |
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30 */ |
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31 bool setSimilarityThreshold(double similarityThreshold) |
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32 { |
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33 if (similarityThreshold >= 0.0) |
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34 { |
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35 this->similarityThreshold = similarityThreshold; |
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36 return true; |
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37 } |
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38 return false; |
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39 } |
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40 |
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41 /** |
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42 * Set machine epsilon. |
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43 * |
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44 * @param[in] eps machine epsilon |
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45 */ |
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46 bool setEps(double eps) |
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47 { |
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48 if (eps >= 0.0) |
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49 { |
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50 this->eps = eps; |
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51 return true; |
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52 } |
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53 return false; |
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54 } |
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55 |
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56 /** |
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57 * Compute similarity between two trajectories. |
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58 * |
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59 * @param[in] a input trajectory |
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60 * @param[in] b input trajectory |
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61 * @param[out] result distance between two trajectories |
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62 */ |
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63 void distance(const Trajectory<Tr> *a, const Trajectory<Tr> *b, To &result, unsigned int nbOfPoints = std::numeric_limits<unsigned int>::max()) |
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64 { |
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65 result = To(0); |
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66 unsigned int LCSS = 0; |
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67 similarity(a,b, LCSS); |
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68 unsigned int min_size = min(a->size(),b->size()); |
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69 result = 1 - double(LCSS/min_size); |
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70 } |
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71 |
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72 /** |
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73 * Compute similarity between two trajectories. |
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74 * |
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75 * @param[in] a input trajectory |
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76 * @param[in] b input trajectory |
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77 * @param[out] result similarity between two trajectories |
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78 */ |
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79 void similarity(const Trajectory<Tr> *a, const Trajectory<Tr> *b, unsigned int &result) |
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80 { |
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81 unsigned int LCS[a->size() + 1][b->size() + 1]; |
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82 |
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83 { //initialisation |
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84 for (unsigned int i = 0; i <= a->size(); ++i) |
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85 { |
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86 LCS[i][0] = 0; |
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87 } |
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88 |
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89 for (unsigned int j = 0; j <= b->size(); ++j) |
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90 { |
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91 LCS[0][j] = 0; |
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92 } |
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93 } |
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94 |
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95 { //algorithm |
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96 for (unsigned int i = 1; i <= a->size(); ++i) |
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97 { |
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98 for (unsigned int j = 1; j <= b->size(); ++j) |
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99 { |
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100 cv::Point3_<typeof(static_cast<Tr>(a->getPoint(i-1)).x)> p(a->getPoint(i - 1) - b->getPoint(j - 1)); |
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101 double distance = sqrt(pow(p.x, 2) + pow(p.y, 2) + pow(p.z, 2)); // il faudrait généraliser |
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102 if (distance <= similarityThreshold + eps) |
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103 { //a[i] == b[j] |
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104 LCS[i][j] = LCS[i - 1][j - 1] + 1; |
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105 } |
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106 else |
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107 { |
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108 LCS[i][j] = std::max(LCS[i - 1][j], LCS[i][j - 1]); |
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109 } |
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110 } |
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111 } |
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112 } |
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113 |
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114 result = LCS[a->size()][b->size()]; |
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115 } |
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116 |
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117 private: |
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118 /** |
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119 * Similarity threshold between two points. |
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120 */ |
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121 double similarityThreshold; |
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122 |
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123 /** |
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124 * Machine epsilon. |
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125 */ |
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126 double eps; |
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127 |
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128 }; |
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129 |
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130 #endif /* LCSMETRIC_H_ */ |