Empirical modeling for non-Lambertian reflectance based on full-waveform laser detection

Empirical modeling for non- Lambertian reflectance based on full- waveform laser detection

Detection of Weak Laser Pulses by Full Waveform Stacking

Pulse detection is a fundamental task of processing data of pulsed laser systems for extracting features of the illuminated object. Weak pulses below the threshold are discarded by classic methods and the involved information will get lost. In this paper we present an approach for detecting weak pulses from waveform laser data based on analyzing neighbourhood relations given by coplanarity cons...

Lambertian Reflectance and Linear Subspaces

We prove that the set of all Lambertian reflectance functions (the mapping from surface normals to intensities) obtained with arbitrary distant light sources lies close to a 9D linear subspace. This implies that, in general, the set of images of a convex Lambertian object obtained under a wide variety of lighting conditions can be approximated accurately by a low-dimensional linear subspace, ex...

Perspective Shape from Shading with Non-Lambertian Reflectance

In this work, we extend the applicability of perspective Shape from Shading to images incorporating non-Lambertian surfaces. To this end, we derive a new model inspired by the perspective model for Lambertian surfaces recently studied by Prados et al. and the Phong reflection model incorporating ambient, diffuse and specular components. Besides the detailed description of the modeling process, ...

Improved shape from shading using non-Lambertian reflectance models

This thesis focuses on the use of non-Lambertian reflectance models for curved surface analysis. The contributions are: a) to show how specular and diffuse reflectance models can be used to recover surface normal estimates using shape-from-shading (SFS), b) to show how wave scattering theory can be used to estimate rough surface characteristics, and c) to present a method for surface normal smo...