Skip to Main content Skip to Navigation
Theses

On the definition and recognition of planar shapes in digital images

Abstract : This thesis deals with the recognition of shapes in digital images. A suitable shape representation is derived by analyzing invariance to perturbations that do not significantly affect visual recognition: contrast changes, partial occlusion, noise, perspective distortion. The atours of such a representation,called shape elements, provide semi local descriptions of shapes. Matching shape elements enables the recognition of "partial shapes" : Then, "global shapes" are defined as groups of partial shapes showing some spatial coherence. Deriving unsupervised thresholds involved in all decision levels of the shape recognition process, is the central points of this work. We propose decision rules for both the correspondence problem of partial shapes, and for the detection of global shapes. The proposed framework is based on a general detection methodology asserting that meaningful events may be viewed as exceptions to randomness.
Document type :
Theses
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00133648
Contributor : Ens Cachan Bibliothèque <>
Submitted on : Tuesday, February 27, 2007 - 11:56:08 AM
Last modification on : Thursday, July 2, 2020 - 5:17:17 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 9:29:32 PM

Identifiers

  • HAL Id : tel-00133648, version 1

Collections

Citation

Pablo Musé. On the definition and recognition of planar shapes in digital images. Mathematics [math]. École normale supérieure de Cachan - ENS Cachan, 2004. English. ⟨tel-00133648⟩

Share

Metrics

Record views

1854

Files downloads

1619