Examinando por Autor "Álvarez-Agudelo, N. (Natalia)"

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  • Miniatura
    PublicaciónAcceso abierto
    Descripción de un dispositivo destinado al análisis de la marcha en dos dimensiones, CineMED
    (2014-05-07) Díaz-León, C. A. (Christian Andrés); Torres-Velásquez, A. (Andrés); Ramirez-Giraldo, J. I. (Jose Ignacio); Álvarez-Agudelo, N. (Natalia); Garcia-Muriel, L. F. (Luisa Fernanda)
    This paper introduces a device for the gait kinematic analysis. It is based on videogrametry methods and image processing in order to record the human movement. It was used a digital camcorder, located to a distance of four meters from the person, capturing its gait in the sagital plane. Also, a kinematic model was developed of lower limbs; this model takes the position data of the bony landmarks and calculates the joint angle of the hip, knee and ankle, besides the pelvic tilt during gait. The identification and tracking of the points was carried out by a special reflective coated in the superficial markers. Later, it was designed and developed an algorithm in order to record and process the data gathered, through of the camcorder in the develop language C# .NET. The application developed captures and processes the video, tracking every marker in the frame, applies the kinematic model and shows the graph of the joint angle during gait. Finally, a protocol was designed and a test was carried out with a person in order to compare the data gathered for the software and the theoretical data described in the literature. In spite of the limitations of the system related to gait bidimensional analysis, articular curves very similar to those theoretical were obtained with commercial methods for the tridimensional movement analysis.
  • Miniatura
    PublicaciónAcceso abierto
    Descripción de un sistema para la medición de las presiones plantares por medio del procesamiento de imágenes. Fase I
    (2014-05-08) Autor Díaz-León, C. A. (Christian Andrés); Torres-Velásquez, A. (Andrés); Ramirez-Giraldo, J. I. (Jose Ignacio); Garcia-Muriel, L. F. (Luisa Fernanda); Álvarez-Agudelo, N. (Natalia)
    The measurement of the plantar pressure is basic to know the force distribution in the sole. These values are important to diagnosis and treat different pathologies as diabetic ulcerate in the sole, bone, and muscular deformations in the lower limb, etc. This paper describes the development of a pedobarograph in order to analyze the sole. The development can be classified in three stages, building of the Podoscopio, selection of the transducer material and development of the software in order to processes the picture captured by the camcorder. The device PodoMED makes a dynamic and static analysis of the sole, using pseudocolor images for walking analysis and podological indexes as valgo index, Clarke angle, Hernandez Corvo index, etc. for static analysis. In the development of this project we carried out experimental test to minimize the noise present in the image. It was achieved by using a physical filter and image processing filter. In a future phase, it plans the system calibration and validation, which expects to offer more reliability itself.