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Displaying 1-8 out of 8 total
Class-Specific Simplex-Latent Dirichlet Allocation for Image Classification
Found in: 2013 IEEE International Conference on Computer Vision (ICCV)
By Mandar Dixit,Nikhil Rasiwasia,Nuno Vasconcelos
Issue Date:December 2013
pp. 2672-2679
An extension of the latent Dirichlet allocation (LDA), denoted class-specific-simplex LDA (css-LDA), is proposed for image classification. An analysis of the supervised LDA models currently used for this task shows that the impact of class information on t...
Improving Product Classification Using Images
Found in: Data Mining, IEEE International Conference on
By Anitha Kannan,Partha Pratim Talukdar,Nikhil Rasiwasia,Qifa Ke
Issue Date:December 2011
pp. 310-319
Product classification in Commerce search (\eg{} Google Product Search, Bing Shopping) involves associating categories to offers of products from a large number of merchants. The categorized offers are used in many tasks including product taxonomy browsing...
Holistic Context Models for Visual Recognition
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Nikhil Rasiwasia,Nuno Vasconcelos
Issue Date:May 2012
pp. 902-917
A novel framework to context modeling based on the probability of co-occurrence of objects and scenes is proposed. The modeling is quite simple, and builds upon the availability of robust appearance classifiers. Images are represented by their posterior pr...
A study of query by semantic example
Found in: Computer Vision and Pattern Recognition Workshop
By Nikhil Rasiwasia, Nuno Vasconcelos
Issue Date:June 2008
pp. 1-8
In recent years, query-by-semantic-example (QBSE) has become a popular approach to do content based image retrieval [20, 23, 18]. QBSE extends the well established query-by-example retrieval paradigm to the semantic domain. While various authors have point...
Scene classification with low-dimensional semantic spaces and weak supervision
Found in: Computer Vision and Pattern Recognition, IEEE Computer Society Conference on
By Nikhil Rasiwasia, Nuno Vasconcelos
Issue Date:June 2008
pp. 1-6
A novel approach to scene categorization is proposed. Similar to previous works of [11, 15, 3, 12], we introduce an intermediate space, based on a low dimensional semantic “theme” image representation. However, instead of learning the themes in an unsuperv...
On the Role of Correlation and Abstraction in Cross-Modal Multimedia Retrieval
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Jose Costa Pereira,Emanuele Coviello,Gabriel Doyle,Nikhil Rasiwasia,Gert R. G. Lanckriet,Roger Levy,Nuno Vasconcelos
Issue Date:March 2014
pp. 521-535
The problem of cross-modal retrieval from multimedia repositories is considered. This problem addresses the design of retrieval systems that support queries across content modalities, for example, using an image to search for texts. A mathematical formulat...
A new approach to cross-modal multimedia retrieval
Found in: Proceedings of the international conference on Multimedia (MM '10)
By Emanuele Coviello, Gabriel Doyle, Gert R.G. Lanckriet, Jose Costa Pereira, Nikhil Rasiwasia, Nuno Vasconcelos, Roger Levy
Issue Date:October 2010
pp. 251-260
The problem of joint modeling the text and image components of multimedia documents is studied. The text component is represented as a sample from a hidden topic model, learned with latent Dirichlet allocation, and images are represented as bags of visual ...
Image retrieval using query by contextual example
Found in: Proceeding of the 1st ACM international conference on Multimedia information retrieval (MIR '08)
By Nikhil Rasiwasia, Nuno Vasconcelos
Issue Date:October 2008
pp. 1-1
Current image retrieval techniques have difficulties to retrieve images which exhibit distinct visual patterns but belong to the class of the query image. Previous attempts to improve generalization have shown that the introduction of semantic representati...