Tesis
Integrated three-dimensional reconstruction with efficiently acquiring reflectance fields
Autor
MARIA LUISA ROSAS CHOLULA
Institución
Resumen
The reconstruction of object surfaces is an important area in computer vision. This
area is directed towards the recovery of three-dimensional information of an object
placed in a scene. Most classical existing reconstruction methods assume that objects
in the scene reflect light equally in all directions. This assumption on surface
reflectance is referred as a Lambertian BRDF (Bidirectional Reflectance Distribution
Function) however, Lambertian reflectance is not fulfilled for real-world objects, leading
to incorrect depth estimates. Several methods propose a partial solution taking
advantage of calibrated cameras and lights or some approximation of the surface
reflectance.
Reflectance fields are a common image-based model used for rendering the appearance
of objects with a high-degree of realism. Reflectance fields are used in a
variety of applications. For example, they are used to capture the appearance of
real-world objects with complex geometry, like human bodies, furry teddy bears, or
bonsai trees. They are also used to represent intricate distributions of light, like the
illumination from a flash light. However, despite the increasing popularity of using
reflectance fields, fast methods do not exist for acquiring them.
This thesis presents two main contributions towards reflectance field acquisition
and three-dimensional reconstruction. The first is a method for acquiring efficiently
the reflectance field data to provide the surface reflectance information. This method
introduces the use of independent component analysis, it enables fast acquisition of
the reflectance field. The prototype acquisition system consists of a pair of projector
and camera controlled by a computer. The effectiveness of the system is demonstrated
with scenes composed of different material properties where the reflectance quality is
maintained.
The second contribution is a three-dimensional reconstruction of real-world objects
placed in the scene. Three-dimensional reconstruction is obtained by relating depth
estimations with reflectance fields. The reflectance field is integrated with threedimensional
reconstruction equations by considering the system setup as a stereo
system, it provides depth estimations of objects exhibiting different material properties
with high accuracy.
Materias
Ítems relacionados
Mostrando ítems relacionados por Título, autor o materia.
-
Compendio de innovaciones socioambientales en la frontera sur de México
Adriana Quiroga -
Caminar el cafetal: perspectivas socioambientales del café y su gente
Eduardo Bello Baltazar; Lorena Soto_Pinto; Graciela Huerta_Palacios; Jaime Gomez -
Material de empaque para biofiltración con base en poliuretano modificado con almidón, metodos para la manufactura del mismo y sistema de biofiltración
OLGA BRIGIDA GUTIERREZ ACOSTA; VLADIMIR ALONSO ESCOBAR BARRIOS; SONIA LORENA ARRIAGA GARCIA