RT info:eu-repo/semantics/doctoralThesis
T1 Consideraciones acerca de la viabilidad de un sensor plenóptico en dispositivos de consumo
A1 Gómez Cárdenes, Óscar
A2 Departamento de Ingeniería Industrial
K1 cámaras fotográficas
K1 dispositivos móviles
K1 sensores plenópticos
AB Passive distance measurement of the objects in an image gives place to interesting applications that have the potential to revolutionize the field of photography. In this thesis a prototype of plenoptic camera for mobile devices was created and studied. This technique has two main disadvantages: the need for modifying the camera module and the loss of resolution. Because of this, the prototype was discarded in order to utilize another technique: depth from focus.In this technique the capture method consists in taking several images while varying the focus distance. The set of images is called focal-stack. Different focus operators are studied, which give a measure of defocus per pixel and plane of the focal-stack. The curvelet based focus operator is chosen as the most adequate. It is computationally more intensive than other operators but it is capable of decomposing natural images using few coefficients. In order to make viable its usage in mobile devices a new curvelet transform based on the discrete Radon transform is built. The discrete Radon transform has logarithmic complexity, does not use the Fourier transform and uses only integer sums. Lastly, different versions of the Radon transform are analyzed with the goal of achieving an even faster transform. These transforms are implemented to be executed on mobile devices. Additionally, an application of the Radon transform is presented. It consists in the detection of bar-codes that have any orientation in an image.
YR 2019
FD 2019
LK http://riull.ull.es/xmlui/handle/915/17645
UL http://riull.ull.es/xmlui/handle/915/17645
LA en
NO Doctorado en Ingeniería Industrial
DS Repositorio institucional de la Universidad de La Laguna
RD 13-may-2024