[visionlist] Postdoctoral position 1 year - CNAM Paris, France : Definition of a typology of multimedia data and evaluation of associated index structures

Tue Jul 15 12:18:40 PDT 2008

*Postdoctoral position - CNAM Paris, France*

Definition of a typology of multimedia data and
evaluation of associated index structures

*Keywords: *multimedia data, data analysis, data indexing, content-based 
image and audio descriptors, multidimensional index structures

*Duration:* 1 year starting before end of 2008

*Application deadline: *September 30, 2008

**

*Research groups and labs.*

This post-doc will be conducted in the Vertigo research group of the 
French Laboratory in Computer Science CEDRIC at CNAM (Conservatoire 
National des Arts et Métiers) in Paris, in collaboration with the 
Database research group of LAMSADE Laboratory of Paris-Dauphine 
University and the Analysis-Synthesis research group of IRCAM Institute.

CNAM: http://www.cnam.eu/
CNAM/CEDRIC/Vertigo: 
http://cedric.cnam.fr/AfficheEquipe.php?id=9&lang=en 
<http://cedric.cnam.fr/AfficheEquipe.php?id=9&lang=en>
LAMSADE: http://www.lamsade.dauphine.fr/ (French)
LAMSADE/Database research group: 
http://www.lamsade.dauphine.fr/groups.php?id_group=4 (French)
IRCAM: http://www.ircam.fr/?L=1
IRCAM/Analysis-Synthesis research group: 
http://www.ircam.fr/anasyn.html?L=1

This work is supported by the DISCO project (2008-2010) which is a 
French initiative that gathers several research institutes and 
universities and that aims at designing and experimenting generic and 
flexible techniques for content-based indexing and searching, dedicated 
to distributed sources of multimedia documents 
(http://www.lamsade.dauphine.fr/rigaux/disco_anr/index).

* 
Description*

The work consists in studying and defining a typology of multimedia 
data, and in evaluating several multidimensional index structures 
according to this typology. More precisely, it can be decomposed into 
two tasks:

o   The multimedia content-based descriptors (image, video and audio), 
made available by the consortium of the DISCO project, produce 
multidimensional features (signatures) of different natures. The 
associated spaces mainly differ in terms of dimensionality, size and 
distribution of the population. For example, content-based visual 
descriptors computed from frames of video sequences contain much more 
redundancy than those belonging to still images. The first objective of 
this work is to study the characteristics of such multidimensional 
spaces by proposing criteria that will allow defining a typology of 
these spaces. This study will facilitate the use and development of 
future index structures for rapid access to data, the underlying 
objective being to mutualize the work for several modalities. This part 
will be done in collaboration with Valerie Gouet-Brunet for image and 
video and with Geoffroy Peeters for audio contents.

o   The second task deals with the evaluation of index structures for 
large collections of signatures. The aim is to propose a framework for 
the evaluation of state-of-the-art index structures according to the 
proposed typology. For instance, previous works have demonstrated that 
several index structures are efficient with uniform distribution data 
(e.g. indexes based on space partitioning), whereas others are better 
with clustered distributions (e.g. tree-based indexes). Such a study 
will also conduct to the definition of criteria allowing the dynamic 
selection of the most appropriate indexing technique according to a 
given descriptor, to a given query type as well as to the potential 
combination of several modalities available to build the query. This 
part will be done in collaboration with Maude Manouvrier, Marta Rukoz 
and Valerie Gouet-Brunet.

**

*Required skills*

* *PhD in computer science, databases and/or data analysis
C/C++ or Java programming
Experience in the problem of scalability (curse of dimensionality) or in 
non-textual data (image, video, sound)

* 
Contacts*

Valerie Gouet-Brunet
CNAM - CC 432, 292, rue Saint-Martin - F75141 Paris Cedex 03
Tel : +33 1 58 80 86 35/ Fax : +33 1 58 80 84 93
Valerie.Gouet at cnam.fr <mailto:Valerie.Gouet at cnam.fr>

Maude Manouvrier
LAMSADE - Universite Paris IX Dauphine, Place du Maréchal De Lattre de 
Tassigny 75775 PARIS CEDEX 16
Tel : +33 1 44 05 41 85 / Fax : +33 1  44 05 40 90
manouvrier at lamsade.dauphine.fr <mailto:manouvrier at lamsade.dauphine.fr>

Geoffroy Peeters
IRCAM - 1, pl. Igor Stravinsky 75004 Paris
Tel : +33 1 44 78 14 22 / Fax : +33 1  44 78 15 40
Geoffroy.Peeters at ircam.fr <mailto:Marta.Rukoz at dauphine.fr>

Marta Rukoz
LAMSADE - Universite Paris IX Dauphine, Place du Maréchal De Lattre de 
Tassigny 75775 PARIS CEDEX 16
Tel : +33 1 44 05 41 85 / Fax : +33 1  44 05 40 90
Marta.Rukoz at dauphine.fr <mailto:Marta.Rukoz at dauphine.fr>

*Application procedure*

Before September 30, 2008, send your application by email to the four 
contacts: a detailed CV, a letter explaining your motivations for the 
topic and recommendation letters from three referees.

* *

-- 
______________________________________________________________

Valerie Gouet-Brunet
CNAM - CC 432               INRIA Rocquencourt - Imedia Group
292, rue St. Martin         Domaine de Voluceau, BP 105
F75141 Paris Cedex 03       F78153 Le Chesnay Cedex
Tel : +33 1 58 80 86 35     Tel : +33 1 39 63 57 81
Fax : +33 1 58 80 84 93     Fax : +33 1 39 63 56 74
______________________________________________________________ 

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