Recovery of SHGCs from a single intensity view
Gross, A.D.
Boult, T.E.
Dept. of Comput. Sci., Queens Coll., Flushing, NY ;
This paper appears in: Pattern Analysis and Machine Intelligence, IEEE Transactions on
Publication Date: Feb 1996
Volume: 18,
Issue: 2
On page(s): 161-180
ISSN: 0162-8828
References Cited: 39
CODEN: ITPIDJ
INSPEC Accession Number: 5208607
Digital Object Identifier: 10.1109/34.481541
Current Version Published: 2002-08-06
Abstract
Generalized cylinders are a flexible, loosely-defined class of
parametric shapes capable of modeling many real-world objects. Straight
homogeneous generalized cylinders are an important subclass of
generalized cylinders, whose cross-sections are scaled versions of a
reference curve. Although there has been considerable research into
recovering the shape of SHGCs from their contour, this work has almost
exclusively involved methods that couple contour and heuristic
constraints. A rigorous approach to the problem of recovering solid
parametric shape from a single intensity view should involve at least
two stages: (1) deriving the contour constraints, and (2) determining if
additional image constraints, e.g., intensity, can be used to uniquely
determine the 3D object shape. In this paper, the authors follow the
approach just described. This methodology is also important for the
recovery of object classes like tubes, where contour and heuristic
constraints are shown to be insufficient for shape recovery. First, the
authors prove that SHGC contours generated under orthography have
exactly two degrees of freedom. Next, the authors show that the
remaining free parameters can be resolved using reflectance-based
constraints, without knowledge of the number of light sources, their
positions, intensities, the amount of ambient light; or the surface
albedo. Finally, the reflectance-based recovery algorithm is
demonstrated on both synthetic and real SHGC images
Index
Terms
Available to subscribers and IEEE members.
References
Available to subscribers and IEEE members.
Citing Documents
Available to subscribers and IEEE members.
Cart
