Patrice Denis

Patrice DENIS Identity Photo

Researcher in image and document processing

Key words:

Image features detectors and descriptors, Saliency Modelisation, Optical Character Recognition, Document Security, Quaternions and Clifford Algebra for Color Image Processing, Watermarking, Zernike moments, Mellin-Fourier Transform, Fourier Transforms.

Research:

I worked from February 2014 to February 2015 as a postdoctoral engineer in the L3i laboratory in the VISIIR ANR project to define high level feature descriptors.
I worked for SOOD between 2009 and February 2014 in colloboration of the University of La Rochelle's L3i laboratory as a research engineer to define a tool that secures paper documents reproduction. In that context I was working on problematics such as character recognition, signatures definition and watermarking. I was also interesting before that, during my PhD thesis, in the definition and use of mathematic models to embed colour information in digital images. The models I used are quaternions and geometrical algebras. Using them, one can operate on colour pixels using only algebraic expressions, replacing the matrix notation often used to process colour images. With this formalism, colour are seen as multivalued vectorial components in opposition to the marginal representation and processing.

Publications:

International Revues
  1. Improvement of natural image search engines results by emotional filtering Patrice Denis, Vincent Courboulay, Arnaud Revel, Syntyche Gbèhounou, François Lecellier, Christine Fernandez-Maloigne
    EAI Endorsed Transactions on Creative Technologies - Feb. 2016
  2. Spatial color image processing using Clifford algebras : application to color active contour P. Carré, P. Denis, C. Fernandez-Maloigne Signal, Image and Video Processing, pp.1.16, Springer - 2012
    The final publication is available at Springer via http://dx.doi.org/10.1007/s11760-012-0366-5
  3. Spatial and spectral Quaternionic approaches for Colour Images Denis P., Carré P., Fernandez-Maloigne C. Computer Vision and Image Understanding, Volume 107, pages 74—87, Issues 1-2, Special issue on color image processing - July 2007
Book Chapter
  1. Analyse d’images couleur par approches quaternioniques Patrice Denis, Philippe Carré dans Quaternions réels, duaux et complexes - Applications en robotique, imagerie numérique, aérospatiale, biomécanique, physique relativiste et quantique
    sous la direction de Jean et Pierre-Emmanuel Hladik, pp:209--232, Ellipses Éditions, isbn:9782340010468 - Mar. 2016
International Conferences
  1. Colour Gradient using Geometric Algebra Denis P., Carré P. EUSIPCO2007, 15th European Signal Processing Conference, Poznan, Poland - September 2007
  2. Quaternionic Wavelet Transform for Colour Images Carré P., Denis P. Wavelet Applications in Industrial Processing IV, Volume 6383, Boston, Massachusetts, USA - October 2006
National Conference
  1. Méthode de détection de contours utilisant l’Algèbre Géométrique G3 Denis P., Carré P. GRETSI07, 21ème Colloque GRETSI sur le Traitement du Signal et des Images, Troyes, France - Septembre 2007
Phd Thesis
  1. Quaternions et Algèbres Géométriques, de nouveaux outils pour les images numériques couleur Denis P. Thèse de l’Université de Poitiers - Décembre 2007
Master Thesis
  1. Fourier et Images Couleur Denis P., Carré P., Fernandez-Maloigne C. DEA de l’Université de Poitiers - Laboratoire SIC - 2004
Other Communication
  1. Analyse fréquentielle couleur : les quaternions une solution ? Denis P., Carré P., Fernandez-Maloigne C. Journée thématique du GDR ISIS : "Traitements perceptifs couleur dédiés à l’image et à la vidéo", Cergy-Pontoise - Novembre 2005

External sites :





See Patrice Denis ResearchGate's profile

See Patrice Denis Google Schoolar's profile