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Author | Ernest Valveny; Enric Marti | ||||
Title | A model for image generation and symbol recognition through the deformation of lineal shapes | Type | Journal Article | ||
Year | 2003 | Publication | Pattern Recognition Letters | Abbreviated Journal | PRL |
Volume | 24 | Issue | 15 | Pages | 2857-2867 |
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Abstract | We describe a general framework for the recognition of distorted images of lineal shapes, which relies on three items: a model to represent lineal shapes and their deformations, a model for the generation of distorted binary images and the combination of both models in a common probabilistic framework, where the generation of deformations is related to an internal energy, and the generation of binary images to an external energy. Then, recognition consists in the minimization of a global energy function, performed by using the EM algorithm. This general framework has been applied to the recognition of hand-drawn lineal symbols in graphic documents. | ||||
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Publisher | Elsevier Science Inc. | Place of Publication | New York, NY, USA | Editor | |
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Series Volume | Series Issue | Edition | |||
ISSN | 0167-8655 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | DAG; IAM | Approved | no | ||
Call Number | IAM @ iam @ VAM2003 | Serial | 1653 | ||
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Author | Ernest Valveny; Enric Marti | ||||
Title | Learning of structural descriptions of graphic symbols using deformable template matching | Type | Conference Article | ||
Year | 2001 | Publication | Proc. Sixth Int Document Analysis and Recognition Conf | Abbreviated Journal | |
Volume | Issue | Pages | 455-459 | ||
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Abstract | Accurate symbol recognition in graphic documents needs an accurate representation of the symbols to be recognized. If structural approaches are used for recognition, symbols have to be described in terms of their shape, using structural relationships among extracted features. Unlike statistical pattern recognition, in structural methods, symbols are usually manually defined from expertise knowledge, and not automatically infered from sample images. In this work we explain one approach to learn from examples a representative structural description of a symbol, thus providing better information about shape variability. The description of a symbol is based on a probabilistic model. It consists of a set of lines described by the mean and the variance of line parameters, respectively providing information about the model of the symbol, and its shape variability. The representation of each image in the sample set as a set of lines is achieved using deformable template matching. | ||||
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Notes | DAG;IAM; | Approved | no | ||
Call Number | IAM @ iam @ VMA2001 | Serial | 1654 | ||
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Author | Ernest Valveny; Enric Marti | ||||
Title | Deformable Template Matching within a Bayesian Framework for Hand-Written Graphic Symbol Recognition | Type | Journal Article | ||
Year | 2000 | Publication | Graphics Recognition Recent Advances | Abbreviated Journal | |
Volume | 1941 | Issue | Pages | 193-208 | |
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Abstract | We describe a method for hand-drawn symbol recognition based on deformable template matching able to handle uncertainty and imprecision inherent to hand-drawing. Symbols are represented as a set of straight lines and their deformations as geometric transformations of these lines. Matching, however, is done over the original binary image to avoid loss of information during line detection. It is defined as an energy minimization problem, using a Bayesian framework which allows to combine fidelity to ideal shape of the symbol and flexibility to modify the symbol in order to get the best fit to the binary input image. Prior to matching, we find the best global transformation of the symbol to start the recognition process, based on the distance between symbol lines and image lines. We have applied this method to the recognition of dimensions and symbols in architectural floor plans and we show its flexibility to recognize distorted symbols. | ||||
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Corporate Author | Springer Verlag | Thesis | |||
Publisher | Springer Verlag | Place of Publication | Editor | ||
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Notes | DAG;IAM; | Approved | no | ||
Call Number | IAM @ iam @ MVA2000 | Serial | 1655 | ||
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Author | Ernest Valveny; Enric Marti | ||||
Title | Hand-drawn symbol recognition in graphic documents using deformable template matching and a Bayesian framework | Type | Conference Article | ||
Year | 2000 | Publication | Proc. 15th Int Pattern Recognition Conf | Abbreviated Journal | |
Volume | 2 | Issue | Pages | 239-242 | |
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Abstract | Hand-drawn symbols can take many different and distorted shapes from their ideal representation. Then, very flexible methods are needed to be able to handle unconstrained drawings. We propose here to extend our previous work in hand-drawn symbol recognition based on a Bayesian framework and deformable template matching. This approach gets flexibility enough to fit distorted shapes in the drawing while keeping fidelity to the ideal shape of the symbol. In this work, we define the similarity measure between an image and a symbol based on the distance from every pixel in the image to the lines in the symbol. Matching is carried out using an implementation of the EM algorithm. Thus, we can improve recognition rates and computation time with respect to our previous formulation based on a simulated annealing algorithm. | ||||
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Language | Summary Language | Original Title | |||
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ISSN | ISBN | 0-7695-0750-6 | Medium | ||
Area | Expedition | Conference | |||
Notes | DAG;IAM; | Approved | no | ||
Call Number | IAM @ iam @ VAM2000 | Serial | 1656 | ||
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Author | Ernest Valveny; Enric Marti | ||||
Title | Application of deformable template matching to symbol recognition in hand-written architectural draw | Type | Conference Article | ||
Year | 1999 | Publication | Proceedings of the Fifth International Conference on | Abbreviated Journal | |
Volume | Issue | Pages | |||
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Abstract | We propose to use deformable template matching as a new approach to recognize characters and lineal symbols in hand-written line drawings, instead of traditional methods based on vectorization and feature extraction. Bayesian formulation of the deformable template matching allows combining fidelity to the ideal shape of the symbol with maximum flexibility to get the best fit to the input image. Lineal nature of symbols can be exploited to define a suitable representation of models and the set of deformations to be applied to them. Matching, however, is done over the original binary image to avoid losing relevant features during vectorization. We have applied this method to hand-written architectural drawings and experimental results demonstrate that symbols with high distortions from ideal shape can be accurately identified. | ||||
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Publisher | Place of Publication | Bangalore (India) | Editor | ||
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Notes | DAG;IAM; | Approved | no | ||
Call Number | IAM @ iam @ VAM1999a | Serial | 1657 | ||
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Author | Ernest Valveny; Enric Marti | ||||
Title | Recognition of lineal symbols in hand-written drawings using deformable template matching | Type | Conference Article | ||
Year | 1999 | Publication | Proceedings of the VIII Symposium Nacional de Reconocimiento de Formas y Análisis de Imágenes | Abbreviated Journal | |
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Notes | DAG;IAM; | Approved | no | ||
Call Number | IAM @ iam @ VAM1999 | Serial | 1658 | ||
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Author | Ernest Valveny; Enric Marti | ||||
Title | Dimensions analysis in hand-drawn architectural drawings | Type | Conference Article | ||
Year | 1997 | Publication | VII National Simposium of Pattern Recognition and image Analysis, SNRFAI´97 | Abbreviated Journal | |
Volume | Issue | Pages | 90-91 | ||
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Publisher | Place of Publication | CVC-UAB | Editor | ||
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Notes | DAG;IAM; | Approved | no | ||
Call Number | IAM @ iam @ VAM1997 | Serial | 1659 | ||
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Author | Ernest Valveny; Ricardo Toledo; Ramon Baldrich; Enric Marti | ||||
Title | Combining recognition-based in segmentation-based approaches for graphic symol recognition using deformable template matching | Type | Conference Article | ||
Year | 2002 | Publication | Proceeding of the Second IASTED International Conference Visualization, Imaging and Image Proceesing VIIP 2002 | Abbreviated Journal | |
Volume | Issue | Pages | 502–507 | ||
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Notes | DAG;RV;CAT;IAM;CIC;ADAS | Approved | no | ||
Call Number | IAM @ iam @ VTB2002 | Serial | 1660 | ||
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Author | Sergio Vera | ||||
Title | Finger joint modelling from hand X-ray images for assessing rheumatoid arthritis | Type | Report | ||
Year | 2010 | Publication | CVC Technical Report | Abbreviated Journal | |
Volume | 164 | Issue | Pages | ||
Keywords | Rheumatoid arthritis; joint detection; X-ray; Van der Heijde score | ||||
Abstract | Rheumatoid arthritis is an autoimmune, systemic, inflammatory disorder that mainly af- fects bone joints. While there is no cure for this disease, continuous advances on palliative treatments require frequent verification of patient’s illness evolution. Such evolution is mea- sured through several available semi-quantitative methods that require evaluation of hand and foot X-ray images. Accurate assessment is a time consuming task that requires highly trained personnel. This hinders a generalized use in clinical practice for early diagnose and disease follow-up. In the context of the automatization of such evaluation methods we present a method for detection and characterization of finger joints in hand radiography images. Several measures for assessing the reduction of joint space width are proposed. We compare for the first time such measures to the Van der Heijde score, the gold standard method for rheumatoid arthritis assessment. The proposed method outperforms existing strategies with a detection rate above 95%. Our comparison to Van der Heijde index shows a promising correlation that encourages further research. | ||||
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Corporate Author | Thesis | Master's thesis | |||
Publisher | Place of Publication | Bellaterra 01893, Barcelona, Spain | Editor | ||
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Notes | IAM | Approved | no | ||
Call Number | IAM @ iam @ Ver2010 | Serial | 1661 | ||
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Author | Fernando Vilariño; Debora Gil; Petia Radeva | ||||
Title | A Novel FLDA Formulation for Numerical Stability Analysis | Type | Book Chapter | ||
Year | 2004 | Publication | Recent Advances in Artificial Intelligence Research and Development | Abbreviated Journal | |
Volume | 113 | Issue | Pages | 77-84 | |
Keywords | Supervised Learning; Linear Discriminant Analysis; Numerical Stability; Computer Vision | ||||
Abstract | Fisher Linear Discriminant Analysis (FLDA) is one of the most popular techniques used in classification applying dimensional reduction. The numerical scheme involves the inversion of the within-class scatter matrix, which makes FLDA potentially ill-conditioned when it becomes singular. In this paper we present a novel explicit formulation of FLDA in terms of the eccentricity ratio and eigenvector orientations of the within-class scatter matrix. An analysis of this function will characterize those situations where FLDA response is not reliable because of numerical instability. This can solve common situations of poor classification performance in computer vision. | ||||
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Publisher | IOS Press | Place of Publication | Editor | J. Vitrià, P. Radeva and I. Aguiló | |
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ISSN | ISBN | 978-1-58603-466-5 | Medium | ||
Area | Expedition | Conference | |||
Notes | MV;IAM;MILAB;SIAI | Approved | no | ||
Call Number | IAM @ iam @ VGR2004 | Serial | 1663 | ||
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Author | Fernando Vilariño; Enric Marti | ||||
Title | New didactic techniques in the EHES applying mobile technologies | Type | Miscellaneous | ||
Year | 2008 | Publication | Agencia de Gestio d´Ajuts Universitaris I de Recerca (AGAUR), Generalitat de Catalunya | Abbreviated Journal | |
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Corporate Author | Agencia de Gestió d’Ajuts Universitaris I de Recerca (AGAUR), Generalitat de Catalunya | Thesis | |||
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Area | Agencia de Gestio d´Ajuts Universitaris I de Recerca (AGAUR), Generalitat de Catalunya | Expedition | Conference | ||
Notes | MILAB;IAM;MV;SIAI | Approved | no | ||
Call Number | IAM @ iam @ VIM2008 | Serial | 1664 | ||
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Author | Sergio Escalera; Jordi Gonzalez; Xavier Baro; Miguel Reyes; Oscar Lopes; Isabelle Guyon; V. Athitsos; Hugo Jair Escalante | ||||
Title | Multi-modal Gesture Recognition Challenge 2013: Dataset and Results | Type | Conference Article | ||
Year | 2013 | Publication | 15th ACM International Conference on Multimodal Interaction | Abbreviated Journal | |
Volume | Issue | Pages | 445-452 | ||
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Abstract | The recognition of continuous natural gestures is a complex and challenging problem due to the multi-modal nature of involved visual cues (e.g. fingers and lips movements, subtle facial expressions, body pose, etc.), as well as technical limitations such as spatial and temporal resolution and unreliable
depth cues. In order to promote the research advance on this field, we organized a challenge on multi-modal gesture recognition. We made available a large video database of 13; 858 gestures from a lexicon of 20 Italian gesture categories recorded with a KinectTM camera, providing the audio, skeletal model, user mask, RGB and depth images. The focus of the challenge was on user independent multiple gesture learning. There are no resting positions and the gestures are performed in continuous sequences lasting 1-2 minutes, containing between 8 and 20 gesture instances in each sequence. As a result, the dataset contains around 1:720:800 frames. In addition to the 20 main gesture categories, ‘distracter’ gestures are included, meaning that additional audio and gestures out of the vocabulary are included. The final evaluation of the challenge was defined in terms of the Levenshtein edit distance, where the goal was to indicate the real order of gestures within the sequence. 54 international teams participated in the challenge, and outstanding results were obtained by the first ranked participants. |
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Address | Sidney; Australia; December 2013 | ||||
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ISSN | ISBN | 978-1-4503-2129-7 | Medium | ||
Area | Expedition | Conference | ICMI | ||
Notes | HUPBA; ISE; 600.063;MV | Approved | no | ||
Call Number | Admin @ si @ EGB2013 | Serial | 2373 | ||
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Author | Onur Ferhat; Fernando Vilariño | ||||
Title | A Cheap Portable Eye-Tracker Solution for Common Setups | Type | Conference Article | ||
Year | 2013 | Publication | 17th European Conference on Eye Movements | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | Low cost; eye-tracker; software; webcam; Raspberry Pi | ||||
Abstract | We analyze the feasibility of a cheap eye-tracker where the hardware consists of a single webcam and a Raspberry Pi device. Our aim is to discover the limits of such a system and to see whether it provides an acceptable performance. We base our work on the open source Opengazer (Zielinski, 2013) and we propose several improvements to create a robust, real-time system. After assessing the accuracy of our eye-tracker in elaborated experiments involving 18 subjects under 4 different system setups, we developed a simple game to see how it performs in practice and we also installed it on a Raspberry Pi to create a portable stand-alone eye-tracker which achieves 1.62° horizontal accuracy with 3 fps refresh rate for a building cost of 70 Euros. | ||||
Address | Lund; Sweden; August 2013 | ||||
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Area | Expedition | Conference | ECEM | ||
Notes | MV;SIAI | Approved | no | ||
Call Number | Admin @ si @ FeV2013 | Serial | 2374 | ||
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Author | David Vazquez; Enrique Cabello | ||||
Title | Empleo de sistemas biométricos faciales aplicados al reconocimiento de personas en aeropuertos | Type | Report | ||
Year | 2007 | Publication | Ingeniería Técnica en Informática de Sistemas | Abbreviated Journal | URJC |
Volume | Issue | Pages | |||
Keywords | Surveillance; Face detection; Face recognition | ||||
Abstract | El presente proyecto se desarrolló a lo largo del año 2005 y 2006, probando un prototipo de un sistema de verificación facial con imágenes extraídas de las cámaras de video-vigilancia del aeropuerto de Barajas. Se diseñaron varios experimentos, agrupados en dos clases. En el primer tipo, el sistema es entre- nado con imágenes obtenidas en condiciones de laboratorio y luego probado con imágenes extraídas de las cámaras de video-vigilancia del aeropuerto de Barajas. En el segundo caso, tanto las imágenes de entrenamiento como las de prueba corresponden a imágenes extraídas de Barajas.
Se ha desarrollado un sistema completo, que incluye adquisición y digitalización de las imágenes, localización y recorte de las caras en escena, verificación de sujetos y obtención de resultados. Los resultados muestran que, en general, un sistema de verificación facial basado en imágenes puede ser una valiosa ayuda a un operario que deba estar vigilando amplias zonas. |
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Corporate Author | Thesis | Bachelor's thesis | |||
Publisher | Place of Publication | Editor | |||
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Notes | invisible;ADAS | Approved | no | ||
Call Number | ADAS @ adas @ VC2007a | Serial | 1671 | ||
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Author | Aura Hernandez-Sabate; Debora Gil; David Roche; Monica M. S. Matsumoto; Sergio S. Furuie | ||||
Title | Inferring the Performance of Medical Imaging Algorithms | Type | Conference Article | ||
Year | 2011 | Publication | 14th International Conference on Computer Analysis of Images and Patterns | Abbreviated Journal | |
Volume | 6854 | Issue | Pages | 520-528 | |
Keywords | Validation, Statistical Inference, Medical Imaging Algorithms. | ||||
Abstract | Evaluation of the performance and limitations of medical imaging algorithms is essential to estimate their impact in social, economic or clinical aspects. However, validation of medical imaging techniques is a challenging task due to the variety of imaging and clinical problems involved, as well as, the difficulties for systematically extracting a reliable solely ground truth. Although specific validation protocols are reported in any medical imaging paper, there are still two major concerns: definition of standardized methodologies transversal to all problems and generalization of conclusions to the whole clinical data set.
We claim that both issues would be fully solved if we had a statistical model relating ground truth and the output of computational imaging techniques. Such a statistical model could conclude to what extent the algorithm behaves like the ground truth from the analysis of a sampling of the validation data set. We present a statistical inference framework reporting the agreement and describing the relationship of two quantities. We show its transversality by applying it to validation of two different tasks: contour segmentation and landmark correspondence. |
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Address | Sevilla | ||||
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Publisher | Springer-Verlag Berlin Heidelberg | Place of Publication | Berlin | Editor | Pedro Real; Daniel Diaz-Pernil; Helena Molina-Abril; Ainhoa Berciano; Walter Kropatsch |
Language | Summary Language | Original Title | |||
Series Editor | Series Title | L | Abbreviated Series Title | LNCS | |
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Area | Expedition | Conference | CAIP | ||
Notes | IAM; ADAS | Approved | no | ||
Call Number | IAM @ iam @ HGR2011 | Serial | 1676 | ||
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