Listar Productos de investigación por autor "Patiño Vanegas, Alberto"

Mostrando ítems 1-11 de 11

    • A low noise stenography method for medical images with QR encoding of patient information 

      Patiño Vanegas, Alberto; Contreras Ortiz, Sonia Helena; Martínez-Santos, Juan Carlos (SPIE, 2017)
      This paper proposes an approach to facilitate the process of individualization of patients from their medical images, without compromising the inherent confidentiality of medical data. The identification of a patient from ...

    • Adaptive filtering of interference fringes by polar transformation and empirical mode decomposition 

      Altamar Mercado, Hernando; Patiño Vanegas, Alberto; Marrugo A.G. (OSA - The Optical Society, 2018)
      We designed an adaptive filter based on empirical mode decomposition for the removal of fringes in an interference microscopy image. Promising results show the possibility for extended depth-of-field imaging. © 2018 The Author (s)

    • Automatic recognition of Colombian car license plates using convolutional neural networks and Chars74k database 

      Arroyo-Pérez, D E; Álvarez-Canchila, O I; Patiño-Saucedo, A; Rostro González, H; Patiño Vanegas, Alberto (Cartagena de Indias, 2020)
      A methodology for the automatic recognition of Colombian car license plates using convolutional neural networks is proposed. One of the biggest challenges when using onvolutional neural network is the demand for large ...

    • Designing Fresnel microlenses for focusing astigmatic multi-Gaussian beams by using fractional order Fourier transforms 

      Patiño Vanegas, Alberto; Durand, P.E.; Fogret, É.; Pellat-Finet, P. (Institute of Physics Publishing, 2011)
      According to a scalar theory of diffraction, light propagation can be expressed by two-dimensional fractional order Fourier transforms. Since the fractional Fourier transform of a chirp function is a Dirac distribution, ...

    • Diffuser in Fractional Fourier Optics 

      Patiño Vanegas, Alberto; Durand, P.E.; Pellat-Finet P.; Torres R. (OSA - The Optical Society, 2016)
      We propose a method for calculating a bandlimited diffuser with smooth spectrum in the Fresnel domain without any 2p phase ambiguities using the fractional Fourier transform. Such diffusers are necessary to avoid problems ...

    • HoloEasy, a web application for computer generated holograms 

      Patiño Vanegas, Alberto; Diaz-Pacheco L.L.; Patiño-Vanegas J.J.; Martínez-Santos J.C. (Springer Verlag, 2018)
      If the appropriate phase and/or amplitude profile is placed on a Diffractive Optical Element (DOE) it can practically generate an image of an object (hologram) by diffraction of the light. The problem of generating computer ...

    • Microscopic shape from focus using white light interferometric fringes 

      Altamar Mercado, Hernando; Patiño Vanegas, Alberto; Marrugo A.G. (OSA - The Optical Society, 2018)
      In this work we study the use of a focus measure to improve the 3D reconstruction of low reflectivity microscopic samples using white light interference microscopy. Simulation and experimental results show the improved ...

    • Modeling of dynamic mass coupled system with Runge-Kutta fourth order 

      Rojas, L.; Molina-Cardenas, M.; Caballero, E.; Rojas, C.; Patiño Vanegas, Alberto (Institute of Physics Publishing, 2019)
      This paper shows the mathematical modeling process of a mechanical system of masses coupled by two springs and a shock absorber. The process of capture of movement of the mass system coupled with springs was done with ...

    • Region growing segmentation of ultrasound images using gradients and local statistics 

      Mercado-Aguirre I.M.; Patiño Vanegas, Alberto; Contreras Ortiz, Sonia Helena (SPIE, 2017)
      This paper describes a region growing segmentation algorithm for medical ultrasound images. The algorithm starts with anisotropic diffusion filtering to reduce speckle noise without blurring the edges. Then, region growing ...

    • Robust 3D surface recovery by applying a focus criterion in white light scanning interference microscopy 

      Altamar Mercado, Hernando; Patiño Vanegas, Alberto; Marrugo A.G. (OSA - The Optical Society, 2019)
      White light scanning interference (WLSI) microscopes provide an accurate surface topography of engineered surfaces. However, the measurement accuracy is substantially reduced in surfaces with low-reflectivity regions or ...

    • α-bandlimited diffuser in fractional Fourier optics 

      Patiño Vanegas, Alberto; Durand, P.E.; Torres R.; Pellat-Finet P. (SPIE, 2016)
      We propose a method for calculating appropriate α-band limited diffusers using the fractional Fourier transform. In order to do this, we implement a method for performing a numerical interpolation in the fractional Fourier ...

      Universidad Tecnológica de Bolívar - 2017 Institución de Educación Superior sujeta a inspección y vigilancia por el Ministerio de Educación Nacional. Resolución No 961 del 26 de octubre de 1970 a través de la cual la Gobernación de Bolívar otorga la Personería Jurídica a la Universidad Tecnológica de Bolívar.