Listar por tema "Speckle"

Mostrando ítems 1-5 de 5

    • 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 ...

    • Selection of a Stopping Criterion for Anisotropic Diffusion Filtering in Ultrasound Images 

      Guillen J.E.I.; Contreras Ortiz, Sonia Helena (Institute of Electrical and Electronics Engineers Inc., 2019)
      Ultrasound imaging is a safe and cost-effective diagnostic tool, but the quality of the images is affected by speckle noise and artifacts. Anisotropic diffusion filters can be used to reduce noise and preserve the edges ...

    • Speckle free optical watermarking based on pseudo-random phase encoding 

      Patino A.; Altamar Mercado, Hernando; Martínez-Santos, Juan Carlos (Institute of Electrical and Electronics Engineers Inc., 2016)
      Watermarking is a process of embedding copiright information into an image to verify the ownership without any kind of corruption. In optical applications, the usage of diffusers is required to obtain a homogeneously ...

    • Speckle reduction in echocardiography by temporal compounding and anisotropic diffusion filtering 

      Giraldo-Guzmán J.; Porto-Solano O.; Cadena-Bonfanti A.J.; Contreras Ortiz, Sonia Helena (SPIE, 2015)
      Echocardiography is a medical imaging technique based on ultrasound signals that is used to evaluate heart anatomy and physiology. Echocardiographic images are affected by speckle, a type of multiplicative noise that ...

    • 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.