Home | [151–160] << 161 162 163 164 165 166 167 168 169 170 >> [171–180] |
![]() |
Records | |||||
---|---|---|---|---|---|
Author | David Geronimo; Antonio Lopez; Angel Sappa | ||||
Title ![]() |
Computer Vision Approaches for Pedestrian Detection: Visible Spectrum Survey | Type | Conference Article | ||
Year | 2007 | Publication | 3rd Iberian Conference on Pattern Recognition and Image Analysis, LNCS 4477 | Abbreviated Journal | |
Volume | 1 | Issue | Pages | 547–554 | |
Keywords | Pedestrian detection | ||||
Abstract | Pedestrian detection from images of the visible spectrum is a high relevant area of research given its potential impact in the design of pedestrian protection systems. There are many proposals in the literature but they lack a comparative viewpoint. According to this, in this paper we first propose a common framework where we fit the different approaches, and second we use this framework to provide a comparative point of view of the details of such different approaches, pointing out also the main challenges to be solved in the future. In summary, we expect
this survey to be useful for both novel and experienced researchers in the field. In the first case, as a clarifying snapshot of the state of the art; in the second, as a way to unveil trends and to take conclusions from the comparative study. |
||||
Address | Girona (Spain) | ||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | J. Marti et al. | ||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | |||
Notes | ADAS | Approved | no | ||
Call Number | ADAS @ adas @ GLS2007 | Serial | 804 | ||
Permanent link to this record | |||||
Author | Fernando Vilariño | ||||
Title ![]() |
Computer Vision and Performing Arts | Type | Conference Article | ||
Year | 2015 | Publication | Korean Scholars of Marketing Science | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | |||||
Abstract | |||||
Address | Seoul; Korea; October 2015 | ||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | KAMS | ||
Notes | MV;SIAI | Approved | no | ||
Call Number | Admin @ si @Vil2015 | Serial | 2799 | ||
Permanent link to this record | |||||
Author | Ferran Poveda | ||||
Title ![]() |
Computer Graphics and Vision Techniques for the Study of the Muscular Fiber Architecture of the Myocardium | Type | Book Whole | ||
Year | 2013 | Publication | PhD Thesis, Universitat Autonoma de Barcelona-CVC | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | |||||
Abstract | |||||
Address | |||||
Corporate Author | Thesis | Ph.D. thesis | |||
Publisher | Place of Publication | Editor | Debora Gil;Enric Marti | ||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | |||
Notes | IAM | Approved | no | ||
Call Number | Admin @ si @ Pov2013 | Serial | 2417 | ||
Permanent link to this record | |||||
Author | Angel Sappa (ed) | ||||
Title ![]() |
Computer Graphics and Imaging | Type | Book Whole | ||
Year | 2010 | Publication | Computer Graphics and Imaging | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | |||||
Abstract | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | Angel Sappa | ||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | 978–0–88986–836–6 | Medium | ||
Area | Expedition | Conference | CGIM | ||
Notes | ADAS | Approved | no | ||
Call Number | ADAS @ adas @ Sap2010 | Serial | 1468 | ||
Permanent link to this record | |||||
Author | Angel Sappa; George A. Triantafyllid | ||||
Title ![]() |
Computer Graphics and Imaging | Type | Book Whole | ||
Year | 2012 | Publication | Computer Graphics and Imaging | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | |||||
Abstract | |||||
Address | Crete, Greece | ||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | 978-0-88986-921-9 | Medium | ||
Area | Expedition | Conference | |||
Notes | ADAS | Approved | no | ||
Call Number | Admin @ si @ Sap2012 | Serial | 2067 | ||
Permanent link to this record | |||||
Author | David Berga; Xavier Otazu | ||||
Title ![]() |
Computations of top-down attention by modulating V1 dynamics | Type | Conference Article | ||
Year | 2020 | Publication | Computational and Mathematical Models in Vision | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | |||||
Abstract | |||||
Address | St. Pete Beach; Florida; May 2020 | ||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | MODVIS | ||
Notes | NEUROBIT | Approved | no | ||
Call Number | Admin @ si @ BeO2020a | Serial | 3376 | ||
Permanent link to this record | |||||
Author | David Berga; Xavier Otazu | ||||
Title ![]() |
Computations of inhibition of return mechanisms by modulating V1 dynamics | Type | Conference Article | ||
Year | 2019 | Publication | 28th Annual Computational Neuroscience Meeting | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | |||||
Abstract | In this study we present a unifed model of the visual cortex for predicting visual attention using real image scenes. Feedforward mechanisms from RGC and LGN have been functionally modeled using wavelet filters at distinct orientations and scales for each chromatic pathway (Magno-, Parvo-, Konio-cellular) and polarity (ON-/OFF-center), by processing image components in the CIE Lab space. In V1, we process cortical interactions with an excitatory-inhibitory network of fring rate neurons, initially proposed by (Li, 1999), later extended by (Penacchio et al. 2013). Firing rates from model’s output have been used as predictors of neuronal activity to be projected in a map in superior colliculus (with WTA-like computations), determining locations of visual fxations. These locations will be considered as already visited areas for future saccades, therefore we integrated a spatiotemporal function of inhibition of return mechanisms (where LIP/FEF is responsible) to feed to the model with spatial memory for next saccades. Foveation mechanisms have been simulated with a cortical magnifcation function, which distort spatial viewing properties for each fxation. Results show lower prediction errors than with respect no IoR cases (Fig. 1), and it is functionally consistent with human psychophysical measurements. Our model follows a biologically-constrained architecture, previously shown to reproduce visual saliency (Berga & Otazu, 2018), visual discomfort (Penacchio et al. 2016), brightness (Penacchio et al. 2013) and chromatic induction (Cerda & Otazu, 2016). | ||||
Address | Barcelona; July 2019 | ||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | CNS | ||
Notes | NEUROBIT; no menciona | Approved | no | ||
Call Number | Admin @ si @ BeO2019a | Serial | 3373 | ||
Permanent link to this record | |||||
Author | Oriol Rodriguez-Leor; Carlo Gatta; E. Fernandez-Nofrerias; Oriol Pujol; Neus Salvatella; C. Bosch; H. Tizon; Petia Radeva; J. Mauri | ||||
Title ![]() |
Computationally Efficient Image-based IVUS Pullbacks Gating | Type | Journal | ||
Year | 2008 | Publication | European Heart Journal, ESC Supplement, Munich, 2008, p. 775 | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | |||||
Abstract | |||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | |||
Notes | MILAB;HuPBA | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ RGF2008 | Serial | 1036 | ||
Permanent link to this record | |||||
Author | David Berga; Xavier Otazu | ||||
Title ![]() |
Computational modelingof visual attention: What do we know from physiology and psychophysics? | Type | Conference Article | ||
Year | 2019 | Publication | 8th Iberian Conference on Perception | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | |||||
Abstract | Latest computer vision architectures use a chain of feedforward computations, mainly optimizing artificial neural networks for very specific tasks. Although their impressive performance (i.e. in saliency) using real image datasets, these models do not follow several biological principles of the human visual system (e.g. feedback and horizontal connections in cortex) and are unable to predict several visual tasks simultaneously. In this study we present biologically plausible computations from the early stages of the human visual system (i.e. retina and lateral geniculate nucleus) and lateral connections in V1. Despite the simplicity of these processes and without any type of training or optimization, simulations of firing-rate dynamics of V1 are able to predict bottom-up visual attention at distinct contexts (shown previously as well to predict visual discomfort, brightness and chromatic induction). We also show functional top-down selection mechanisms as feedback inhibition projections (i.e. prefrontal cortex for search/task-based attention and parietal area for inhibition of return). Distinct saliency model predictions are tested with eye tracking datasets in free-viewing and visual search tasks, using real images and synthetically-generated patterns. Results on predicting saliency and scanpaths show that artificial models do not outperform biologically-inspired ones (specifically for datasets that lack of common endogenous biases found in eye tracking experimentation), as well as, do not correctly predict contrast sensitivities in pop-out stimulus patterns. This work remarks the importance of considering biological principles of the visual system for building models that reproduce this (and any other) visual effects. | ||||
Address | San Lorenzo El Escorial; July 2019 | ||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | CIP | ||
Notes | NEUROBIT; no menciona | Approved | no | ||
Call Number | Admin @ si @ BeO2019b | Serial | 3374 | ||
Permanent link to this record | |||||
Author | Arash Akbarinia | ||||
Title ![]() |
Computational Model of Visual Perception: From Colour to Form | Type | Book Whole | ||
Year | 2017 | Publication | PhD Thesis, Universitat Autonoma de Barcelona-CVC | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | |||||
Abstract | The original idea of this project was to study the role of colour in the challenging task of object recognition. We started by extending previous research on colour naming showing that it is feasible to capture colour terms through parsimonious ellipsoids. Although, the results of our model exceeded state-of-the-art in two benchmark datasets, we realised that the two phenomena of metameric lights and colour constancy must be addressed prior to any further colour processing. Our investigation of metameric pairs reached the conclusion that they are infrequent in real world scenarios. Contrary to that, the illumination of a scene often changes dramatically. We addressed this issue by proposing a colour constancy model inspired by the dynamical centre-surround adaptation of neurons in the visual cortex. This was implemented through two overlapping asymmetric Gaussians whose variances and heights are adjusted according to the local contrast of pixels. We complemented this model with a generic contrast-variant pooling mechanism that inversely connect the percentage of pooled signal to the local contrast of a region. The results of our experiments on four benchmark datasets were indeed promising: the proposed model, although simple, outperformed even learning-based approaches in many cases. Encouraged by the success of our contrast-variant surround modulation, we extended this approach to detect boundaries of objects. We proposed an edge detection model based on the first derivative of the Gaussian kernel. We incorporated four types of surround: full, far, iso- and orthogonal-orientation. Furthermore, we accounted for the pooling mechanism at higher cortical areas and the shape feedback sent to lower areas. Our results in three benchmark datasets showed significant improvement over non-learning algorithms.
To summarise, we demonstrated that biologically-inspired models offer promising solutions to computer vision problems, such as, colour naming, colour constancy and edge detection. We believe that the greatest contribution of this Ph.D dissertation is modelling the concept of dynamic surround modulation that shows the significance of contrast-variant surround integration. The models proposed here are grounded on only a portion of what we know about the human visual system. Therefore, it is only natural to complement them accordingly in future works. |
||||
Address | October 2017 | ||||
Corporate Author | Thesis | Ph.D. thesis | |||
Publisher | Ediciones Graficas Rey | Place of Publication | Editor | C. Alejandro Parraga | |
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | 978-84-945373-4-9 | Medium | ||
Area | Expedition | Conference | |||
Notes | NEUROBIT | Approved | no | ||
Call Number | Admin @ si @ Akb2017 | Serial | 3019 | ||
Permanent link to this record | |||||
Author | Arjan Gijsenij; Theo Gevers; Joost Van de Weijer | ||||
Title ![]() |
Computational Color Constancy: Survey and Experiments | Type | Journal Article | ||
Year | 2011 | Publication | IEEE Transactions on Image Processing | Abbreviated Journal | TIP |
Volume | 20 | Issue | 9 | Pages | 2475-2489 |
Keywords | computational color constancy;computer vision application;gamut-based method;learning-based method;static method;colour vision;computer vision;image colour analysis;learning (artificial intelligence);lighting | ||||
Abstract | Computational color constancy is a fundamental prerequisite for many computer vision applications. This paper presents a survey of many recent developments and state-of-the- art methods. Several criteria are proposed that are used to assess the approaches. A taxonomy of existing algorithms is proposed and methods are separated in three groups: static methods, gamut-based methods and learning-based methods. Further, the experimental setup is discussed including an overview of publicly available data sets. Finally, various freely available methods, of which some are considered to be state-of-the-art, are evaluated on two data sets. | ||||
Address | |||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | 1057-7149 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | ISE;CIC | Approved | no | ||
Call Number | Admin @ si @ GGW2011 | Serial | 1717 | ||
Permanent link to this record | |||||
Author | Michael Villamizar; A. Sanfeliu; Juan Andrade | ||||
Title ![]() |
Computation of Rotation Local Invariant Features using the Integral Image for Real Time Object Detection | Type | Miscellaneous | ||
Year | 2006 | Publication | 18th International Conference on Pattern Recognition, 81–85 | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | |||||
Abstract | |||||
Address | Hong Kong | ||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Admin @ si @ VSA2006a | Serial | 663 | ||
Permanent link to this record | |||||
Author | Sergio Vera; Debora Gil; Agnes Borras; F. Javier Sanchez; Frederic Perez; Marius G. Linguraru; Miguel Angel Gonzalez Ballester | ||||
Title ![]() |
Computation and Evaluation of Medial Surfaces for Shape Representation of Abdominal Organs | Type | Book Chapter | ||
Year | 2012 | Publication | Workshop on Computational and Clinical Applications in Abdominal Imaging | Abbreviated Journal | |
Volume | 7029 | Issue | Pages | 223–230 | |
Keywords | medial manifolds, abdomen. | ||||
Abstract | Medial representations are powerful tools for describing and parameterizing the volumetric shape of anatomical structures. Existing methods show excellent results when applied to 2D
objects, but their quality drops across dimensions. This paper contributes to the computation of medial manifolds in two aspects. First, we provide a standard scheme for the computation of medial manifolds that avoid degenerated medial axis segments; second, we introduce an energy based method which performs independently of the dimension. We evaluate quantitatively the performance of our method with respect to existing approaches, by applying them to synthetic shapes of known medial geometry. Finally, we show results on shape representation of multiple abdominal organs, exploring the use of medial manifolds for the representation of multi-organ relations. |
||||
Address | Toronto; Canada; | ||||
Corporate Author | Thesis | ||||
Publisher | Springer Link | Place of Publication | Berlin | Editor | H. Yoshida et al |
Language | English | Summary Language | English | Original Title | |
Series Editor | Series Title | Lecture Notes in Computer Science | Abbreviated Series Title | LNCS | |
Series Volume | Series Issue | Edition | |||
ISSN | 0302-9743 | ISBN | 978-3-642-28556-1 | Medium | |
Area | Expedition | Conference | ABDI | ||
Notes | IAM;MV | Approved | no | ||
Call Number | IAM @ iam @ VGB2012 | Serial | 1834 | ||
Permanent link to this record | |||||
Author | Sergio Vera; Debora Gil; Agnes Borras; F. Javier Sanchez; Frederic Perez; Marius G. Linguraru | ||||
Title ![]() |
Computation and Evaluation of Medial Surfaces for Shape Representation of Abdominal Organs | Type | Conference Article | ||
Year | 2011 | Publication | Workshop on Computational and Clinical Applications in Abdominal Imaging | Abbreviated Journal | |
Volume | 7029 | Issue | Pages | 223-230 | |
Keywords | |||||
Abstract | Medial representations are powerful tools for describing and parameterizing the volumetric shape of anatomical structures. Existing methods show excellent results when applied to 2D objects, but their quality drops across dimensions. This paper contributes to the computation of medial manifolds in two aspects. First, we provide a standard scheme for the computation of medial manifolds that avoid degenerated medial axis segments; second, we introduce an energy based method which performs independently of the dimension. We evaluate quantitatively the performance of our method with respect to existing approaches, by applying them to synthetic shapes of known medial geometry. Finally, we show results on shape representation of multiple abdominal organs, exploring the use of medial manifolds for the representation of multi-organ relations. | ||||
Address | Nice, France | ||||
Corporate Author | Thesis | ||||
Publisher | Springer Berlin Heidelberg | Place of Publication | Editor | In H. Yoshida et al | |
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | ABDI | ||
Notes | IAM; MV | Approved | no | ||
Call Number | VGB2011 | Serial | 2036 | ||
Permanent link to this record | |||||
Author | Sergio Escalera; Petia Radeva; Oriol Pujol | ||||
Title ![]() |
Complex Salient Regions for Computer Vision Problems | Type | Conference Article | ||
Year | 2007 | Publication | IEEE Conference on Computer Vision and Pattern Recognition Workshop on | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | |||||
Abstract | |||||
Address | Minneapolis (USA) | ||||
Corporate Author | Thesis | ||||
Publisher | Place of Publication | Editor | |||
Language | Summary Language | Original Title | |||
Series Editor | Series Title | Abbreviated Series Title | |||
Series Volume | Series Issue | Edition | |||
ISSN | ISBN | Medium | |||
Area | Expedition | Conference | CVPR | ||
Notes | MILAB;HuPBA | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ ERP2007 | Serial | 908 | ||
Permanent link to this record |