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Schémas de suivi d'objets vidéo dans une séquence animée : application à l'interpolation d'images intermédiaires.

Laurent Bonnaud 1
1 TEMICS - Digital image processing, modeling and communication
IRISA - Institut de Recherche en Informatique et Systèmes Aléatoires, Inria Rennes – Bretagne Atlantique
Abstract : The general field of this study is digital signal processing applied to image
sequences for multimedia applications. This work is divided into two main
contributions: an algorithm to segment images into moving video objects and a
temporal interpolation method working with those objects.

The segmentation of the sequence is performed with a temporal tracking
algorithm. A spatio-temporal segmentation algorithm is used to obtain initial
regions in the first image of the sequence. This partition is then tracked
with an active contours technique, which operates on a novel segmentation
representation composed of open boundaries between regions. The algorithm
estimates both the motion of boundaries and the motion of regions. It is also
able to track multiple objects simultaneously and to handle occultations
between them. Results obtained on real image sequences show that this
algorithm achieves a good temporal stability of the segmentation and a correct
accuracy of the boundaries.

The goal of the interpolation algorithm is to reconstruct frames between two
images in a sequence. It is a low-complexity algorithm which can be used at
the end of an object-based coder/decoder chain. The interpolation is
motion-compensated, and uses the motion of regions, estimated during the
tracking. It is also object-based in the sense that the segmentation is used
to accurately predict occultation areas. This algorithm can be used in three
different applications: interpolative coding (where known images are predicted
by interpolation), adaptation of the frame-rate to the terminal display in a
multicast transmission and reconstruction of missing frames (where additional
frames are computed). Experimental results for the first application show that
for a given reconstruction quality, the average compression is higher when
using interpolation than with a causal prediction.
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https://tel.archives-ouvertes.fr/tel-00070533
Contributor : Laurent Bonnaud <>
Submitted on : Friday, May 19, 2006 - 8:47:14 PM
Last modification on : Thursday, January 7, 2021 - 4:22:40 PM
Long-term archiving on: : Sunday, April 4, 2010 - 9:25:18 PM

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  • HAL Id : tel-00070533, version 1

Citation

Laurent Bonnaud. Schémas de suivi d'objets vidéo dans une séquence animée : application à l'interpolation d'images intermédiaires.. Traitement du signal et de l'image [eess.SP]. Université Rennes 1, 1998. Français. ⟨tel-00070533⟩

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