Study of the Distortion of the Indirect Angular Measurements of the Calcaneus Due to Perspective: In Vitro Testing
| Autor: | Gabriel Domínguez-Maldonado, José Rafael González-López, María Reina-Bueno, Inmaculada C. Palomo-Toucedo, José M. Castillo-López, Isidoro Espinosa-Moyano |
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| Přispěvatelé: | Universidad de Sevilla. Departamento de Podología, Universidad de Sevilla. Departamento de Enfermería |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0206 medical engineering
Geometry 02 engineering and technology Kinematics In Vitro Techniques lcsh:Chemical technology gait Biochemistry Article biomechanics Analytical Chemistry 03 medical and health sciences 0302 clinical medicine Perspective (geometry) Image processing Orientation (geometry) medicine Humans Biomechanics Computer-assisted lcsh:TP1-1185 Electrical and Electronic Engineering Instrumentation Gait Physics instrumentation Foot Plane (geometry) 020601 biomedical engineering Atomic and Molecular Physics and Optics Sagittal plane Biomechanical Phenomena image processing Distortion (mathematics) Calcaneus Transverse plane medicine.anatomical_structure Coronal plane computer-assisted foot 030217 neurology & neurosurgery |
| Zdroj: | Sensors (Basel, Switzerland) Sensors Volume 21 Issue 8 Sensors, Vol 21, Iss 2585, p 2585 (2021) idUS. Depósito de Investigación de la Universidad de Sevilla instname |
| ISSN: | 1424-8220 |
| Popis: | The study of the foot is relevant in kinematic analyses of gait. Images captured through a lens can be subjected to various aberrations or distortions that affect the measurements. An in vitro study was performed with a rearfoot simulator to compare the apparent degrees (photographed) with the real ones (placed in the simulator) in the plane of the rearfoot’s orientation, according to variations in the capture angle in other planes of space (the sagittal plane and transverse plane—the latter determined by the foot progression angle). The following regression formula was calculated to correct the distortion of the image: real frontal plane = 0.045 + (1.014 × apparent frontal plane) − (0.018 × sagittal plane × foot progression angle). Considering the results of this study, and already knowing its angle in the transverse and sagittal planes, it is possible to determine the angle of a simulated calcaneus with respect to the ground in the frontal plane, in spite of distortions caused by perspective and the lack of perpendicularity, by applying the above regression formula. The results show that the angular measurements of a body segment made on frames can produce erroneous data due to the variation in the perspective from which the image is taken. This distortion must be considered when determining the real values of the measurements. |
| Databáze: | OpenAIRE |
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