Robust Methods for Assessing the Characteristics of Locomotor Activity Based on Markerless Video Capture Data
Introduction. Analysis of locomotor activity is essential in a number of biomedical and pharmacological research designs, as well as environmental monitoring. The movement trajectories of biological objects can be represented by time series exhibiting a complex multicomponent structure and non-stati...
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| Format: | Article |
| Language: | Russian |
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Saint Petersburg Electrotechnical University "LETI"
2024-07-01
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| Series: | Известия высших учебных заведений России: Радиоэлектроника |
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| Online Access: | https://re.eltech.ru/jour/article/view/885 |
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| author | M. I. Bogachev K. R. Grigarevichius N. S. Pyko S. A. Pyko M. Tsygankova E. A. Plotnikova T. V. Ageeva Ya. O. Mukhamedshina |
| author_facet | M. I. Bogachev K. R. Grigarevichius N. S. Pyko S. A. Pyko M. Tsygankova E. A. Plotnikova T. V. Ageeva Ya. O. Mukhamedshina |
| author_sort | M. I. Bogachev |
| collection | DOAJ |
| description | Introduction. Analysis of locomotor activity is essential in a number of biomedical and pharmacological research designs, as well as environmental monitoring. The movement trajectories of biological objects can be represented by time series exhibiting a complex multicomponent structure and non-stationary dynamics, thus limiting the effectiveness of conventional correlation and spectral time series analysis methods. Recordings obtained using markerless technologies are typically characterized by enhanced noise levels, including both instrumental noise and anomalous errors associated with false estimates of the location of the points of interest, as well as gaps in the trajectories, promoting an urgent need in the development of robust methods to assess the characteristics of locomotor activity.Aim. Development of robust methods for assessing the characteristics of locomotor activity capable of efficient processing of noisy recordings obtained by markerless video-based motion capture systems.Materials and methods. In order to assess the characteristics of locomotor activity, the relative movements of body parts of laboratory animals were analyzed using the stability metrics of the mutual dynamics of their trajectories, their relative delays, as well as the relative duration of the recording fragments when relatively stable mutual dynamics could be observed. The local maxima of the cross-correlation function of two body fragments, the minima of the standard deviation of the difference between their Hilbert phases, as well as their relative delays, were used as the metrics of mutual dynamics.Results. The considered phase metrics were shown to explicitly reflect changes in locomotor activity, while the assessment of time delays using phase metric was shown to be prone to periodic error. The above limitation could be largely overcome using the correlation metrics, assuming that phase and correlation metrics could be combined.Conclusion. The proposed robust methods provide stable estimates of the characteristics of locomotor activity based on markerless video capture recordings, altogether increasing the efficiency of diagnostic procedures and assessment of the therapeutic effect during rehabilitation. |
| format | Article |
| id | doaj-art-d5c83db573144538ad2b8f8224f5bf77 |
| institution | Kabale University |
| issn | 1993-8985 2658-4794 |
| language | Russian |
| publishDate | 2024-07-01 |
| publisher | Saint Petersburg Electrotechnical University "LETI" |
| record_format | Article |
| series | Известия высших учебных заведений России: Радиоэлектроника |
| spelling | doaj-art-d5c83db573144538ad2b8f8224f5bf772025-08-20T03:57:32ZrusSaint Petersburg Electrotechnical University "LETI"Известия высших учебных заведений России: Радиоэлектроника1993-89852658-47942024-07-0127310812310.32603/1993-8985-2024-27-3-108-123575Robust Methods for Assessing the Characteristics of Locomotor Activity Based on Markerless Video Capture DataM. I. Bogachev0K. R. Grigarevichius1N. S. Pyko2S. A. Pyko3M. Tsygankova4E. A. Plotnikova5T. V. Ageeva6Ya. O. Mukhamedshina7Saint Petersburg Electrotechnical University; Kazan (Volga Region) Federal UniversitySaint Petersburg Electrotechnical UniversitySaint Petersburg Electrotechnical UniversitySaint Petersburg Electrotechnical UniversitySaint Petersburg Electrotechnical UniversityKazan (Volga Region) Federal UniversityKazan (Volga Region) Federal UniversityKazan (Volga Region) Federal University; Kazan State Medical UniversityIntroduction. Analysis of locomotor activity is essential in a number of biomedical and pharmacological research designs, as well as environmental monitoring. The movement trajectories of biological objects can be represented by time series exhibiting a complex multicomponent structure and non-stationary dynamics, thus limiting the effectiveness of conventional correlation and spectral time series analysis methods. Recordings obtained using markerless technologies are typically characterized by enhanced noise levels, including both instrumental noise and anomalous errors associated with false estimates of the location of the points of interest, as well as gaps in the trajectories, promoting an urgent need in the development of robust methods to assess the characteristics of locomotor activity.Aim. Development of robust methods for assessing the characteristics of locomotor activity capable of efficient processing of noisy recordings obtained by markerless video-based motion capture systems.Materials and methods. In order to assess the characteristics of locomotor activity, the relative movements of body parts of laboratory animals were analyzed using the stability metrics of the mutual dynamics of their trajectories, their relative delays, as well as the relative duration of the recording fragments when relatively stable mutual dynamics could be observed. The local maxima of the cross-correlation function of two body fragments, the minima of the standard deviation of the difference between their Hilbert phases, as well as their relative delays, were used as the metrics of mutual dynamics.Results. The considered phase metrics were shown to explicitly reflect changes in locomotor activity, while the assessment of time delays using phase metric was shown to be prone to periodic error. The above limitation could be largely overcome using the correlation metrics, assuming that phase and correlation metrics could be combined.Conclusion. The proposed robust methods provide stable estimates of the characteristics of locomotor activity based on markerless video capture recordings, altogether increasing the efficiency of diagnostic procedures and assessment of the therapeutic effect during rehabilitation.https://re.eltech.ru/jour/article/view/885robust methodsmarkerless television observationsmotion trajectoriescorrelation coefficientphase synchronization coefficientdirected acyclic graphnonparametric bayesian network |
| spellingShingle | M. I. Bogachev K. R. Grigarevichius N. S. Pyko S. A. Pyko M. Tsygankova E. A. Plotnikova T. V. Ageeva Ya. O. Mukhamedshina Robust Methods for Assessing the Characteristics of Locomotor Activity Based on Markerless Video Capture Data Известия высших учебных заведений России: Радиоэлектроника robust methods markerless television observations motion trajectories correlation coefficient phase synchronization coefficient directed acyclic graph nonparametric bayesian network |
| title | Robust Methods for Assessing the Characteristics of Locomotor Activity Based on Markerless Video Capture Data |
| title_full | Robust Methods for Assessing the Characteristics of Locomotor Activity Based on Markerless Video Capture Data |
| title_fullStr | Robust Methods for Assessing the Characteristics of Locomotor Activity Based on Markerless Video Capture Data |
| title_full_unstemmed | Robust Methods for Assessing the Characteristics of Locomotor Activity Based on Markerless Video Capture Data |
| title_short | Robust Methods for Assessing the Characteristics of Locomotor Activity Based on Markerless Video Capture Data |
| title_sort | robust methods for assessing the characteristics of locomotor activity based on markerless video capture data |
| topic | robust methods markerless television observations motion trajectories correlation coefficient phase synchronization coefficient directed acyclic graph nonparametric bayesian network |
| url | https://re.eltech.ru/jour/article/view/885 |
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