Prior-based segmentation and shape registration in the presence of perspective distortion

Tammy Riklin-Raviv, Nahum Kiryati, Nir Sochen

Research output: Contribution to journalArticlepeer-review

Abstract

Challenging object detection and segmentation tasks can be facilitated by the availability of a reference object. However, accounting for possible transformations between the different object views, as part of the segmentation process, remains difficult. Recent statistical methods address this problem by using comprehensive training data. Other techniques can only accommodate similarity transformations. We suggest a novel variational approach to prior-based segmentation, using a single reference object, that accounts for planar projective transformation. Generalizing the Chan-Vese level set framework, we introduce a novel shape-similarity measure and embed the projective homography between the prior shape and the image to segment within a region-based segmentation functional. The proposed algorithm detects the object of interest, extracts its boundaries, and concurrently carries out the registration to the prior shape. We demonstrate prior-based segmentation on a variety of images and verify the accuracy of the recovered transformation parameters.

Original languageEnglish
Pages (from-to)309-328
Number of pages20
JournalInternational Journal of Computer Vision
Volume72
Issue number3
DOIs
StatePublished - May 2007

Keywords

  • Homography
  • Level-sets
  • Prior-based segmentation
  • Projective transformation
  • Registration
  • Variational methods

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