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Title of dissertation: Scene Analysis under Variable Illumination using Gradient Domain Methods
 

Summary: ABSTRACT
Title of dissertation: Scene Analysis under Variable Illumination
using Gradient Domain Methods
Amit Agrawal, Doctor of Philosophy, 2006
Dissertation directed by: Professor Rama Chellappa
Department of Electrical and Computer Engineering
The goal of this research is to develop algorithms for reconstruction and ma-
nipulation of gradient fields for scene analysis, from intensity images captured under
variable illumination. These methods utilize gradients or differential measurements
of intensity and depth for analyzing a scene, such as estimating shape and intrinsic
images, and edge suppression under variable illumination. The differential measure-
ments lead to robust reconstruction from gradient fields in the presence of outliers
and avoid hard thresholds and smoothness assumptions in manipulating image gra-
dient fields.
Reconstruction from gradient fields is important in several applications in-
cluding shape extraction using Photometric Stereo and Shape from Shading, image
editing and matting, retinex, mesh smoothing and phase unwrapping. In these ap-
plications, a non-integrable gradient field is available, which needs to be integrated
to obtain the final image or surface. Previous approaches for enforcing integrability
have focused on least square solutions which do not work well in the presence of

  

Source: Agrawal, Amit - Mitsubishi Electric Research Labs

 

Collections: Engineering