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Représentation et reconnaissance d'objets par champs réceptifs

Vincent Colin de Verdière 1 
1 PRIMA - Perception, recognition and integration for observation of activity
GRAVIR - IMAG - Laboratoire d'informatique GRAphique, VIsion et Robotique de Grenoble, Inria Grenoble - Rhône-Alpes
Abstract : This thesis belong to the field of modelisation and recognition of objects using their appearance. Each object is modeled by a collection of images and recognition is obtained by the matching between a new image and a model image. Images are modeled by measures on local features. Several local descriptor bases are theoretically and experimentally evaluated and a Gaussian derivative basis is selected for its properties which include~: high discriminability for a concise description, scalability and steerability. Invariance to orientation is obtained by setting derivative directions according to the local gradient. Invariance to scale is obtained by a new technique which locally selects a characteristic scale for describing a neighborhood. This scale correspond to a maximum over scale of a Laplacian operator. These invariances are experimentally validated. In our system, an image is decomposed in a grid of overlapping windows which is represented by a corresponding grid of local features computed on these windows. This highly redundant representation enables us to design two robust recognition techniques~: the first one is based on a simple vote and the second one based on the prediction--verification method consists in splitting the recognition process in an hypothesis generation step for a single window followed by a verification step which checks the generated hypothesis on the neighboring windows with inclusion of geometric coherence constraints.
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Submitted on : Wednesday, February 18, 2004 - 12:00:10 PM
Last modification on : Friday, March 25, 2022 - 11:10:36 AM
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  • HAL Id : tel-00004820, version 1



Vincent Colin de Verdière. Représentation et reconnaissance d'objets par champs réceptifs. Interface homme-machine [cs.HC]. Institut National Polytechnique de Grenoble - INPG, 1999. Français. ⟨tel-00004820⟩



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