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Properties of Datasets Predict the Performance of Classifiers
KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP. (Computer Vision Group)
KTH, Skolan för datavetenskap och kommunikation (CSC), Datorseende och robotik, CVAP. (Computer Vision Group)
2013 (engelsk)Manuskript (preprint) (Annet vitenskapelig)
sted, utgiver, år, opplag, sider
2013.
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-145982OAI: oai:DiVA.org:kth-145982DiVA, id: diva2:721378
Merknad

QS 2014

Tilgjengelig fra: 2014-06-04 Laget: 2014-06-04 Sist oppdatert: 2018-01-11bibliografisk kontrollert
Inngår i avhandling
1. Data Driven Visual Recognition
Åpne denne publikasjonen i ny fane eller vindu >>Data Driven Visual Recognition
2014 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis is mostly about supervised visual recognition problems. Based on a general definition of categories, the contents are divided into two parts: one which models categories and one which is not category based. We are interested in data driven solutions for both kinds of problems.

In the category-free part, we study novelty detection in temporal and spatial domains as a category-free recognition problem. Using data driven models, we demonstrate that based on a few reference exemplars, our methods are able to detect novelties in ego-motions of people, and changes in the static environments surrounding them.

In the category level part, we study object recognition. We consider both object category classification and localization, and propose scalable data driven approaches for both problems. A mixture of parametric classifiers, initialized with a sophisticated clustering of the training data, is demonstrated to adapt to the data better than various baselines such as the same model initialized with less subtly designed procedures. A nonparametric large margin classifier is introduced and demonstrated to have a multitude of advantages in comparison to its competitors: better training and testing time costs, the ability to make use of indefinite/invariant and deformable similarity measures, and adaptive complexity are the main features of the proposed model.

We also propose a rather realistic model of recognition problems, which quantifies the interplay between representations, classifiers, and recognition performances. Based on data-describing measures which are aggregates of pairwise similarities of the training data, our model characterizes and describes the distributions of training exemplars. The measures are shown to capture many aspects of the difficulty of categorization problems and correlate significantly to the observed recognition performances. Utilizing these measures, the model predicts the performance of particular classifiers on distributions similar to the training data. These predictions, when compared to the test performance of the classifiers on the test sets, are reasonably accurate.

We discuss various aspects of visual recognition problems: what is the interplay between representations and classification tasks, how can different models better adapt to the training data, etc. We describe and analyze the aforementioned methods that are designed to tackle different visual recognition problems, but share one common characteristic: being data driven.

sted, utgiver, år, opplag, sider
KTH Royal Institute of Technology, 2014. s. ix, 36
Emneord
Visual Recognition, Data Driven, Supervised Learning, Mixture Models, Non-Parametric Models, Category Recognition, Novelty Detection
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-145865 (URN)978-91-7595-197-3 (ISBN)
Disputas
2014-06-12, F3, Lindstedtsvägen 26, KTH, Stockholm, 14:00 (engelsk)
Opponent
Veileder
Merknad

QC 20140604

Tilgjengelig fra: 2014-06-04 Laget: 2014-06-02 Sist oppdatert: 2018-01-11bibliografisk kontrollert

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