Invariants of objects and their images under surjective maps

I. A. Kogan, P. J. Olver

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We examine the relationships between the differential invariants of objects and of their images under a surjective maps. We analyze both the case when the underlying transformation group is projectable and hence induces an action on the image, and the case when only a proper subgroup of the entire group acts projectably. In the former case, we establish a constructible isomorphism between the algebra of differential invariants of the images and the algebra of fiber-wise constant (gauge) differential invariants of the objects. In the latter case, we describe residual effects of the full transformation group on the image invariants. Our motivation comes from the problem of reconstruction of an object from multiple-view images, with central and parallel projections of curves from three-dimensional space to the two-dimensional plane serving as our main examples.

Original languageEnglish (US)
Pages (from-to)260-285
Number of pages26
JournalLobachevskii Journal of Mathematics
Issue number3
StatePublished - Jul 29 2015


  • affine
  • centro-affine
  • curve
  • image processing
  • invariant
  • projective actions
  • surjective map

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