Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure from Motion: Theoretical Foundations of a Novel Approach Using
  Custom Built Invariants   We rephrase the problem of 3D reconstruction from images in terms of
intersections of projections of orbits of custom built Lie groups actions. We
then use an algorithmic method based on moving frames "a la Fels-Olver" to
obtain a fundamental set of invariants of these groups actions. The invariants
are used to define a set of equations to be solved by the points of the 3D
object, providing a new technique for recovering 3D structure from motion.

27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int