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Author ![]() |
Agata Lapedriza; David Masip; Jordi Vitria | ||||
Title | A Hierarchical Approach for Multi-task Logistic Regression | Type | Conference Article | ||
Year | 2007 | Publication | 3rd Iberian Conference on Pattern Recognition and Image Analysis | Abbreviated Journal | |
Volume | 4478 | Issue | Pages | 258–265 | |
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Address | Girona (Spain) | ||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | J. Marti et al. | ||
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Series Editor | Series Title | Abbreviated Series Title | LNCS | ||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | IbPRIA | ||
Notes | OR; MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ LMV2007a | Serial | 902 | ||
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Author ![]() |
Agata Lapedriza; David Masip; Jordi Vitria | ||||
Title | Face Verification using External Features | Type | Miscellaneous | ||
Year | 2006 | Publication | 7th International Conference on Automatic Face and Gesture Recognition (FG´06), 132– 137 | Abbreviated Journal | |
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Address | Southampton (United Kingdom) | ||||
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Notes | OR;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ LMV2006a | Serial | 707 | ||
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Author ![]() |
Agata Lapedriza; David Masip; Jordi Vitria | ||||
Title | On the Use of External Face Features for Identity Verification | Type | Journal | ||
Year | 2006 | Publication | Journal of Multimedia, 1(4): 11–20 | Abbreviated Journal | |
Volume | 1 | Issue | 4 | Pages | 11-20 |
Keywords | Face Verification, Computer Vision, Machine Learning | ||||
Abstract | In general automatic face classification applications images are captured in natural environments. In these cases, the performance is affected by variations in facial images related to illumination, pose, occlusion or expressions. Most of the existing face classification systems use only the internal features information, composed by eyes, nose and mouth, since they are more difficult to imitate. Nevertheless, nowadays a lot of applications not related to security are developed, and in these cases the information located at head, chin or ears zones (external features) can be useful to improve the current accuracies. However, the lack of a natural alignment in these areas makes difficult to extract these features applying classic Bottom-Up methods. In this paper, we propose a complete scheme based on a Top-Down reconstruction algorithm to extract external features of face images. To test our system we have performed face verification experiments using public databases, given that identity verification is a general task that has many real life applications. We have considered images uniformly illuminated, images with occlusions and images with high local changes in the illumination, and the obtained results show that the information contributed by the external features can be useful for verification purposes, specially significant when faces are partially occluded. | ||||
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Area | Expedition | Conference | |||
Notes | OR;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ LMV2006b | Serial | 708 | ||
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Author ![]() |
Agata Lapedriza; David Masip; Jordi Vitria | ||||
Title | Are external face features useful for automatic face classification? | Type | Miscellaneous | ||
Year | 2005 | Publication | IEEE Workshop on Face Recognition Grand Challenge Experiments, 151–ff | Abbreviated Journal | |
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Address | San Diego; CA; USA; | ||||
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Area | Expedition | Conference | |||
Notes | OR;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ LMV2005b | Serial | 547 | ||
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Author ![]() |
Agata Lapedriza; David Masip; Jordi Vitria | ||||
Title | The contribution of external features to face recognition | Type | Book Chapter | ||
Year | 2005 | Publication | Pattern Recognition and Image Analysis (IbPRIA 2005), LNCS 3523: 537–544 | Abbreviated Journal | |
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Address | Estoril (Portugal) | ||||
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Area | Expedition | Conference | |||
Notes | OR;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ LMV2005a | Serial | 546 | ||
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Author ![]() |
Agata Lapedriza; Jaume Garcia; Ernest Valveny; Robert Benavente; Miquel Ferrer; Gemma Sanchez | ||||
Title | Una experiencia de aprenentatge basada en projectes en el ambit de la informatica | Type | Miscellaneous | ||
Year | 2008 | Publication | V Jornades d’Innovacio Docent (UAB) | Abbreviated Journal | |
Volume | Issue | Pages | 63 | ||
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Address | Bellaterra (Spain) | ||||
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Notes | OR; IAM; DAG; CIC; MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ LGV2008 | Serial | 1030 | ||
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Author ![]() |
Agata Lapedriza; Jordi Vitria | ||||
Title | Experimental Study of the Usefulness of External Face Features for Face Classification | Type | Book Chapter | ||
Year | 2005 | Publication | Artificial Intelligence Research and Development, IOS Press, 99–106 | Abbreviated Journal | |
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Address | Amsterdam | ||||
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Area | Expedition | Conference | |||
Notes | OR;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ LaV2005 | Serial | 610 | ||
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Author ![]() |
Agata Lapedriza; Santiago Segui; David Masip; Jordi Vitria | ||||
Title | A Sparse Bayesian Approach for Joint Feature Selection and Classifier Learning | Type | Journal | ||
Year | 2008 | Publication | Pattern Analysis and Applications, Special Issue: Non–Parametric Distance–Based Classification Techniques and Their Applications, | Abbreviated Journal | |
Volume | 11 | Issue | 3-4 | Pages | 299-308 |
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Publisher | Springer | Place of Publication | Editor | ||
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Area | Expedition | Conference | |||
Notes | OR;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ LSM2008 | Serial | 996 | ||
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Author ![]() |
Agnes Borras | ||||
Title | Contributions to the Content-Based Image Retrieval Using Pictorial Queries | Type | Book Whole | ||
Year | 2009 | Publication | PhD Thesis, Universitat Autonoma de Barcelona-CVC | Abbreviated Journal | |
Volume | Issue | Pages | |||
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Abstract | The broad access to digital cameras, personal computers and Internet, has lead to the generation of large volumes of data in digital form. If we want an effective usage of this huge amount of data, we need automatic tools to allow the retrieval of relevant information. Image data is a particular type of information that requires specific techniques of description and indexing. The computer vision field that studies these kind of techniques is called Content-Based Image Retrieval (CBIR). Instead of using text-based descriptions, a system of CBIR deals on properties that are inherent in the images themselves. Hence, the feature-based description provides a universal via of image expression in contrast with the more than 6000 languages spoken in the world.
Nowadays, the CBIR is a dynamic focus of research that has derived in important applications for many professional groups. The potential fields of application can be such diverse as: the medical domain, the crime prevention, the protection of the intel- lectual property, the journalism, the graphic design, the web search, the preservation of cultural heritage, etc. The definition on the role of the user is a key point in the development of a CBIR application. The user is in charge to formulate the queries from which the images are retrieved. We have centered our attention on the image retrieval techniques that use queries based on pictorial information. We have identified a taxonomy composed by four main query paradigms: query-by-selection, query-by-iconic-composition, query- by-sketch and query-by-paint. Each one of these paradigms allows a different degree of user expressivity. From a simple image selection, to a complete painting of the query, the user takes control of the input in the CBIR system. Along the chapters of this thesis we have analyzed the influence that each query paradigm imposes in the internal operations of a CBIR system. Moreover, we have proposed a set of contributions that we have exemplified in the context of a final application. |
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Address | Barcelona (Spain) | ||||
Corporate Author | Thesis | Ph.D. thesis | |||
Publisher | Ediciones Graficas Rey | Place of Publication | Bellaterra | Editor | Josep Llados |
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Notes | DAG; | Approved | no | ||
Call Number | DAG @ dag @ Bor2009; IAM @ iam @ Bor2009 | Serial | 1269 | ||
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Author ![]() |
Agnes Borras | ||||
Title | High-Level Clothes Description Based on Colour-Texture Features. | Type | Miscellaneous | ||
Year | 2002 | Publication | Director: J. Llados, Master Thesis. | Abbreviated Journal | |
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Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | DAG @ dag @ Bor2002 | Serial | 322 | ||
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Author ![]() |
Agnes Borras; Francesc Tous; Josep Llados; Maria Vanrell | ||||
Title | High-Level Clothes Description Based on Colour-Texture and Structural Features | Type | Conference Article | ||
Year | 2003 | Publication | 1rst. Iberian Conference on Pattern Recognition and Image Analysis IbPRIA 2003 | Abbreviated Journal | |
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Address | Palma de Mallorca | ||||
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Notes | DAG;CIC | Approved | no | ||
Call Number | CAT @ cat @ BTL2003b | Serial | 369 | ||
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Author ![]() |
Agnes Borras; Francesc Tous; Josep Llados; Maria Vanrell | ||||
Title | High-Level Clothes Description Based on Color-Texture and Structural Features | Type | Book Chapter | ||
Year | 2003 | Publication | Lecture Notes in Computer Science | Abbreviated Journal | |
Volume | 2652 | Issue | Pages | 108–116 | |
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Abstract | This work is a part of a surveillance system where content- based image retrieval is done in terms of people appearance. Given an image of a person, our work provides an automatic description of his clothing according to the colour, texture and structural composition of its garments. We present a two-stage process composed by image segmentation and a region-based interpretation. We segment an image by modelling it due to an attributed graph and applying a hybrid method that follows a split-and-merge strategy. We propose the interpretation of five cloth combinations that are modelled in a graph structure in terms of region features. The interpretation is viewed as a graph matching with an associated cost between the segmentation and the cloth models. Fi- nally, we have tested the process with a ground-truth of one hundred images. | ||||
Address | Springer-Verlag | ||||
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Area | Expedition | Conference | |||
Notes | DAG;CIC | Approved | no | ||
Call Number | CAT @ cat @ BTL2003a | Serial | 368 | ||
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Author ![]() |
Agnes Borras; Josep Llados | ||||
Title | Corest: A measure of color and space stability to detect salient regions according to human criteria | Type | Conference Article | ||
Year | 2009 | Publication | 5th International Conference on Computer Vision Theory and Applications | Abbreviated Journal | |
Volume | Issue | Pages | 204-209 | ||
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Address | Lisboa, Portugal | ||||
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ISSN | ISBN | 978-989-8111-69-2 | Medium | ||
Area | Expedition | Conference | VISAPP | ||
Notes | DAG | Approved | no | ||
Call Number | DAG @ dag @ BoL2009 | Serial | 1225 | ||
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Author ![]() |
Agnes Borras; Josep Llados | ||||
Title | A Multi-Scale Layout Descriptor Based on Delaunay Triangulation for Image Retrieval | Type | Conference Article | ||
Year | 2008 | Publication | 3rd International Conference on Computer Vision Theory and Applications VISAPP (2) 2008 | Abbreviated Journal | |
Volume | 2 | Issue | Pages | 139-144 | |
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Address | Funchal, Madeira (Portugal) | ||||
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Area | Expedition | Conference | |||
Notes | DAG | Approved | no | ||
Call Number | DAG @ dag @ BoL2008 | Serial | 981 | ||
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Author ![]() |
Agnes Borras; Josep Llados | ||||
Title | Similarity-Based Object Retrieval Using Appearance and Geometric Feature Combination | Type | Book Chapter | ||
Year | 2007 | Publication | 3rd Iberian Conference on Pattern Recognition and Image Analysis (IbPRIA 2007), J. Marti et al. (Eds.) LNCS 4477:113–120 | Abbreviated Journal | LNCS |
Volume | 4478 | Issue | Pages | 33–39 | |
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Abstract | This work presents a content-based image retrieval system of general purpose that deals with cluttered scenes containing a given query object. The system is flexible enough to handle with a single image of an object despite its rotation, translation and scale variations. The image content is divided in parts that are described with a combination of features based on geometrical and color properties. The idea behind the feature combination is to benefit from a fuzzy similarity computation that provides robustness and tolerance to the retrieval process. The features can be independently computed and the image parts can be easily indexed by using a table structure on every feature value. Finally a process inspired in the alignment strategies is used to check the coherence of the object parts found in a scene. Our work presents a system of easy implementation that uses an open set of features and can suit a wide variety of applications. | ||||
Address | Girona (Spain) | ||||
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Publisher | Place of Publication | Editor | |||
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ISSN | ISBN | 978-3-540-72848-1 | Medium | ||
Area | Expedition | Conference | |||
Notes | DAG; | Approved | no | ||
Call Number | DAG @ dag @ BoL2007a; IAM @ iam @ BoL2007a | Serial | 776 | ||
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