Alessandro Perina - Home Page

I am currently a Postdoc at Microsoft Research working with the eScience group (I know... I should move my website on MSR servers...) .

I obtained my doctoral degree in 2010 at the University of Verona supervised by Prof. Vittorio Murino.

From 2006 to 2010 I was member of the VIPS (Vision, Image Processing and Sound) group, at the University of Verona. In Winter 2008 and Summer 2009, I was a research intern in theMachine Learning and Applied Statistics and eScience groups at Microsoft Research (Redmond) under the supervision of Nebojsa Jojic. In the first part of 2010 I was a postdoc working under the Simbad Project, then I have moved to US to join Microsoft Research.

My research primarily involves the use of machine learning techniques and in particular probabilistic graphical models, to engineer solutions to problems in computer vision, computational biology and recently in text analysis.

Right now I am improving the Counting Grid model for Computer Vision applications as I am trying to correlate images with biological signals. I hope to get some very cool result soon!

For more info, papers and some code take a look below.

Ph.D. thesis

A.Perina (2010). Generative models for classification: classification, features organization and features.
Department of Computer Science, University of Verona.

Selected Conference Papers

(Click here for the full list)

N.Jojic and A.Perina, Multidimensional counting grids: Inferring word order from disordered bags of words. In proceedings of Uncertainty in Artificial Intelligence 2011, UAI 2011, Barelona, Spain

A.Perina and N.Jojic, Image analysis by counting on a grid. In proceedings of IEEE Computer Vision and Pattern Recognition, CVPR 2011, Colorado Springs, Colorado

N.Jojic, A.Perina and V.Murino, Structural Epitome: a way to summarize one’s visual input. In proceedings of Neural Information Processing Systems NIPS 2010, Vancouver, Canada.

A.Perina, N.Jojic, U.Castellani, M.Cristani and V.Murino, Object recognition with hierarchical stel models. In proceedings of European Conference on Computer Vision ECCV 2010, Crete, Greece

U.Castellani, A.Perina, V.Murino, M.Bellani, P.Brambilla, Brain Morphometry by probabilistic latent semantic analysis. In proceedings of Medical Image Computing and Computer Assisted Intervention MICCAI 2010, Beijing, China

M.Farenzena, L.Bazzani, A.Perina, V.Murino and M.Cristani, Person re-identification by simmetry driven accumulation of local features. In proceedings of IEEE Computer Vision and Pattern Recognition, CVPR 2010, San Francisco, California

A.Perina, M.Cristani, U.Castellani, V.Murino and N.Jojic, Free energy score-space. In Proceedings of Neural Information Processing Sysmtes, NIPS 2009, Vancvouer, Canada

A.Perina, M.Cristani, U.Castellani, V.Murino, N.Jojic, A hybrid generative/discriminative classification framework based on free-energy terms, International Conf. on Computer Vision, ICCV 2009, Kyoto, Japan

N.Jojic, A.Perina, M.Cristani, V.Murino, B.Frey, Stel component analysis: Modeling spatial correlations in image class structure, In proceedings of IEEE Computer Vision and Pattern Recognition CVPR 2009, Miami, Florida

M.Cristani, A.Perina, U. Castellani,and V.Murino. Geo-located image analysis using latent representations. In proceedings of IEEE Computer Vision and Pattern Recognition, CVPR 2008, Anchorage, Alaska

Journal Papers

A. Perina, M. Cristani, U.Castellani and V. Murino, Free energy score spaces: using generative information in discriminative classifiers, In print (2012), IEEE Transactions on Pattern Analysis and Machine Intelligence

L.Bazzani, M.Cristani, A.Perina, M.Farenzena and V.Murino, Multiple-shot Person Re-identification by Chromatic and Epitomic Analyses, In print (2012), Pattern Recognition Letters

M.Cristani, A.Pesarin, C.Drioli, A.Tavano, A.Perina, V.Murino, Generative Modeling and Classification of Dialogs by a Low-level Turn-taking Feature Pattern Recognition, Pattern Recognition, Vol. 44(8), 1785-1800 (2010), DOI: 10.1016/j.patcog.2011.01.013, Elsevier, Amsterdam, Netherlands

A. Perina, M. Cristani, and V. Murino, Learning natural scene categories by selective multi-level feature extraction, Image and Vision Computing, vol. 28(6): 927-939 (2010), DOI: 10.1016/j.imavis.2009.11.007, ISSN: 0262-8856, Elsevier, Amsterdam, Netherlands

A. Perina, M. Cristani, L. Xumerle, V. Murino, P.F. Pignatti and G. Malerba, Fully non homogeneous hidden Markov model: a bayesian network for haplotype reconstruction and LD block discovery, Artificial Intelligence in Medicine, vol. 45(2-3): 135-150 (2009), DOI: 10.1016/j.artmed.2008.08.015, ISSN: 0933-3657, Elsevier, Amsterdam, Netherlands

M. Cristani, A.Perina, U.Castellani, V. Murino, Geo-located image categorization and location recognition, Pattern Recognition and Image Analysis, vol. 19(2):245-252 (2009), DOI: 10.1134/S1054661809020059, ISSN: 1054-6618, MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC, Berlin, Germany

Sumbissions

A paper at CVPR 2012...

A. Perina, N.Jojic, M. Cristani and V. Murino, Stel Component Analysis: joing segmentation, modeling and recognition of object classes, Revisions required (and submitted), International Journal of Computer Vision, draft

M.Bicego, P.Lovato, A. Perina <someRandomAuthor>, V. Murino, Investigating topic models' capabilities in expression microarray data classification, in submission to IEEE Transactions on Computational Biology

M.Bicego, A.Ulas, U.Castellani, A.Perina, V.Murino, A.F.T. Martins, P.M.Q. Aguiar, M.A.T. Figueiredo, Combining Information Theoretic Kernels with Generative Embeddings for Classification, submitted to Pattern Recognition Journal.