Examinando por Autor "Torres-Velásquez, A. (Andrés)"
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Publicación Acceso abierto El aporte de la biomecánica y la Ingeniería en rehabilitación en la Ingeniería Biomédica de la EIA-CES(2014-04-20) Torres-Velásquez, A. (Andrés); Díaz-León, C. A. (Christian Andrés); García-Muriel, L. F. (Luisa Fernanda); Toro-Hernandez, M. L. (María Luisa)Publicación Acceso 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.Publicación Acceso 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.Publicación Acceso abierto Detección, rastreo y reconstrucción tridimensional de marcadores pasivos para análisis de movimiento humano. Cinemed III(2014-04-24) Díaz-León, C. A. (Christian Andrés); Toro-Hernandez, M. L. (María Luisa); Torres-Velásquez, A. (Andrés); Forero, J. C. (Johana Carolina)One of the most important challenges when a movement analysis system is been developed is the three-dimensional reconstruction. This process involves several algorithms that must work synergistically in order to reconstruct the movement correctly and decreasing the user interventions. For this reason this paper describes in detail a new methodology to carry out the three-dimensional reconstruction of the human movement through the join of different algorithms decreasing the user input during the process (movement analysis system CineMED III). To analyze and evaluate the performance achieved using the methodology proposed, three experimental tests were carried out; a static marker test, bar with two markers in motion and using an error measurement device. CineMED III finally has a performance close to that of commercial systems, showing in the tests performed with the bar a lower average absolute error for the Vicon system, but higher with respect to the Elite system and testing the device with a value of RMS more about the Ariel system, but a smaller maximum error on the latter system., However, the proposed approach presents problems when markers are occluded for long periods of time and when the paths of two markers intersect. To solve these problems, it is proposed to add some cameras into the system to obtain redundant information from the motion capture.