Records |
Author |
Sergio Vera |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Finger joint modelling from hand X-ray images for assessing rheumatoid arthritis |
Type |
Report |
Year |
2010 |
Publication |
CVC Technical Report |
Abbreviated Journal |
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Volume |
164 |
Issue |
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Pages |
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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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Master's thesis |
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Bellaterra 01893, Barcelona, Spain |
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IAM |
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IAM @ iam @ Ver2010 |
Serial |
1661 |
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Author |
Joan M. Nuñez; Debora Gil; Fernando Vilariño |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Finger joint characterization from X-ray images for rheymatoid arthritis assessment |
Type |
Conference Article |
Year |
2013 |
Publication |
6th International Conference on Biomedical Electronics and Devices |
Abbreviated Journal |
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Issue |
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Pages |
288-292 |
Keywords |
Rheumatoid Arthritis; X-Ray; Hand Joint; Sclerosis; Sharp Van der Heijde |
Abstract |
In this study we propose amodular systemfor automatic rheumatoid arthritis assessment which provides a joint space width measure. A hand joint model is proposed based on the accurate analysis of a X-ray finger joint image sample set. This model shows that the sclerosis and the lower bone are the main necessary features in order to perform a proper finger joint characterization. We propose sclerosis and lower bone detection methods as well as the experimental setup necessary for its performance assessment. Our characterization is used to propose and compute a joint space width score which is shown to be related to the different degrees of arthritis. This assertion is verified by comparing our proposed score with Sharp Van der Heijde score, confirming that the lower our score is the more advanced is the patient affection. |
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Barcelona; February 2013 |
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SciTePress |
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800 |
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BIODEVICES |
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IAM;MV; 600.057; 600.054;SIAI |
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no |
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IAM @ iam @ NGV2013 |
Serial |
2196 |
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Author |
Juan A. Carvajal Ayala; Dennis Romero; Angel Sappa |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Fine-tuning based deep convolutional networks for lepidopterous genus recognition |
Type |
Conference Article |
Year |
2016 |
Publication |
21st Ibero American Congress on Pattern Recognition |
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Pages |
467-475 |
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This paper describes an image classification approach oriented to identify specimens of lepidopterous insects at Ecuadorian ecological reserves. This work seeks to contribute to studies in the area of biology about genus of butterflies and also to facilitate the registration of unrecognized specimens. The proposed approach is based on the fine-tuning of three widely used pre-trained Convolutional Neural Networks (CNNs). This strategy is intended to overcome the reduced number of labeled images. Experimental results with a dataset labeled by expert biologists is presented, reaching a recognition accuracy above 92%. |
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Lima; Perú; November 2016 |
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CIARP |
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ADAS; 600.086 |
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no |
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Admin @ si @ CRS2016 |
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2913 |
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Author |
Andres Mafla; Sounak Dey; Ali Furkan Biten; Lluis Gomez; Dimosthenis Karatzas |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Fine-grained Image Classification and Retrieval by Combining Visual and Locally Pooled Textual Features |
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Conference Article |
Year |
2020 |
Publication |
IEEE Winter Conference on Applications of Computer Vision |
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Abstract |
Text contained in an image carries high-level semantics that can be exploited to achieve richer image understanding. In particular, the mere presence of text provides strong guiding content that should be employed to tackle a diversity of computer vision tasks such as image retrieval, fine-grained classification, and visual question answering. In this paper, we address the problem of fine-grained classification and image retrieval by leveraging textual information along with visual cues to comprehend the existing intrinsic relation between the two modalities. The novelty of the proposed model consists of the usage of a PHOC descriptor to construct a bag of textual words along with a Fisher Vector Encoding that captures the morphology of text. This approach provides a stronger multimodal representation for this task and as our experiments demonstrate, it achieves state-of-the-art results on two different tasks, fine-grained classification and image retrieval. |
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Aspen; Colorado; USA; March 2020 |
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WACV |
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DAG; 600.121; 600.129 |
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no |
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Admin @ si @ MDB2020 |
Serial |
3334 |
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Author |
Josep Llados; Horst Bunke; Enric Marti |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Finding rotational symmetries by cyclic string matching |
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Journal Article |
Year |
1997 |
Publication |
Pattern recognition letters |
Abbreviated Journal |
PRL |
Volume |
18 |
Issue |
14 |
Pages |
1435-1442 |
Keywords |
Rotational symmetry; Reflectional symmetry; String matching |
Abstract |
Symmetry is an important shape feature. In this paper, a simple and fast method to detect perfect and distorted rotational symmetries of 2D objects is described. The boundary of a shape is polygonally approximated and represented as a string. Rotational symmetries are found by cyclic string matching between two identical copies of the shape string. The set of minimum cost edit sequences that transform the shape string to a cyclically shifted version of itself define the rotational symmetry and its order. Finally, a modification of the algorithm is proposed to detect reflectional symmetries. Some experimental results are presented to show the reliability of the proposed algorithm |
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Elsevier |
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DAG;IAM; |
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IAM @ iam @ LBM1997a |
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1562 |
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Author |
Pau Baiget; Eric Sommerlade; I. Reid; Jordi Gonzalez |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Finding Prototypes to Estimate Trajectory Development in Outdoor Scenarios |
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Conference Article |
Year |
2008 |
Publication |
First International Workshop on Tracking Humans for the Evaluation of their Motion in Image Sequences BMVC 2008, |
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27–34 |
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Leed |
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978-84-935251-9-4 |
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ISE |
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no |
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ISE @ ise @ BSR2008 |
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1008 |
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Author |
Marçal Rusiñol; J. Chazalon; Jean-Marc Ogier |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Filtrage de descripteurs locaux pour l'amélioration de la détection de documents |
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Conference Article |
Year |
2016 |
Publication |
Colloque International Francophone sur l'Écrit et le Document |
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Keywords |
Local descriptors; mobile capture; document matching; keypoint selection |
Abstract |
In this paper we propose an effective method aimed at reducing the amount of local descriptors to be indexed in a document matching framework.In an off-line training stage, the matching between the model document and incoming images is computed retaining the local descriptors from the model that steadily produce good matches. We have evaluated this approach by using the ICDAR2015 SmartDOC dataset containing near 25000 images from documents to be captured by a mobile device. We have tested the performance of this filtering step by using ORB and SIFT local detectors and descriptors. The results show an important gain both in quality of the final matching as well as in time and space requirements. |
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Toulouse; France; March 2016 |
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CIFED |
Notes |
DAG; 600.084; 600.077 |
Approved |
no |
Call Number |
Admin @ si @ RCO2016 |
Serial |
2755 |
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Author |
Mariella Dimiccoli |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Figure-ground segregation: A fully nonlocal approach |
Type |
Journal Article |
Year |
2016 |
Publication |
Vision Research |
Abbreviated Journal |
VR |
Volume |
126 |
Issue |
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Pages |
308-317 |
Keywords |
Figure-ground segregation; Nonlocal approach; Directional linear voting; Nonlinear diffusion |
Abstract |
We present a computational model that computes and integrates in a nonlocal fashion several configural cues for automatic figure-ground segregation. Our working hypothesis is that the figural status of each pixel is a nonlocal function of several geometric shape properties and it can be estimated without explicitly relying on object boundaries. The methodology is grounded on two elements: multi-directional linear voting and nonlinear diffusion. A first estimation of the figural status of each pixel is obtained as a result of a voting process, in which several differently oriented line-shaped neighborhoods vote to express their belief about the figural status of the pixel. A nonlinear diffusion process is then applied to enforce the coherence of figural status estimates among perceptually homogeneous regions. Computer simulations fit human perception and match the experimental evidence that several cues cooperate in defining figure-ground segregation. The results of this work suggest that figure-ground segregation involves feedback from cells with larger receptive fields in higher visual cortical areas. |
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MILAB; |
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no |
Call Number |
Admin @ si @ Dim2016b |
Serial |
2623 |
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Author |
Marçal Rusiñol; T.Benkhelfallah; V. Poulain d'Andecy |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Field Extraction from Administrative Documents by Incremental Structural Templates |
Type |
Conference Article |
Year |
2013 |
Publication |
12th International Conference on Document Analysis and Recognition |
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Issue |
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Pages |
1100 - 1104 |
Keywords |
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Abstract |
In this paper we present an incremental framework aimed at extracting field information from administrative document images in the context of a Digital Mail-room scenario. Given a single training sample in which the user has marked which fields have to be extracted from a particular document class, a document model representing structural relationships among words is built. This model is incrementally refined as the system processes more and more documents from the same class. A reformulation of the tf-idf statistic scheme allows to adjust the importance weights of the structural relationships among words. We report in the experimental section our results obtained with a large dataset of real invoices. |
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Washington; USA; August 2013 |
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1520-5363 |
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ICDAR |
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DAG; 600.56; 600.045; 605.203; 602.101 |
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no |
Call Number |
Admin @ si @ RBP2013 |
Serial |
2346 |
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Author |
V. Poulain d'Andecy; Emmanuel Hartmann; Marçal Rusiñol |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Field Extraction by hybrid incremental and a-priori structural templates |
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Conference Article |
Year |
2018 |
Publication |
13th IAPR International Workshop on Document Analysis Systems |
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251 - 256 |
Keywords |
Layout Analysis; information extraction; incremental learning |
Abstract |
In this paper, we present an incremental framework for extracting information fields from administrative documents. First, we demonstrate some limits of the existing state-of-the-art methods such as the delay of the system efficiency. This is a concern in industrial context when we have only few samples of each document class. Based on this analysis, we propose a hybrid system combining incremental learning by means of itf-df statistics and a-priori generic
models. We report in the experimental section our results obtained with a dataset of real invoices. |
Address |
Viena; Austria; April 2018 |
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DAS |
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DAG; 600.084; 600.129; 600.121 |
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no |
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Admin @ si @ PHR2018 |
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3106 |
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Author |
Mohamed Ali Souibgui; Alicia Fornes; Yousri Kessentini; Beata Megyesi |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Few shots are all you need: A progressive learning approach for low resource handwritten text recognition |
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Journal Article |
Year |
2022 |
Publication |
Pattern Recognition Letters |
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PRL |
Volume |
160 |
Issue |
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Pages |
43-49 |
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Abstract |
Handwritten text recognition in low resource scenarios, such as manuscripts with rare alphabets, is a challenging problem. In this paper, we propose a few-shot learning-based handwriting recognition approach that significantly reduces the human annotation process, by requiring only a few images of each alphabet symbols. The method consists of detecting all the symbols of a given alphabet in a textline image and decoding the obtained similarity scores to the final sequence of transcribed symbols. Our model is first pretrained on synthetic line images generated from an alphabet, which could differ from the alphabet of the target domain. A second training step is then applied to reduce the gap between the source and the target data. Since this retraining would require annotation of thousands of handwritten symbols together with their bounding boxes, we propose to avoid such human effort through an unsupervised progressive learning approach that automatically assigns pseudo-labels to the unlabeled data. The evaluation on different datasets shows that our model can lead to competitive results with a significant reduction in human effort. The code will be publicly available in the following repository: https://github.com/dali92002/HTRbyMatching |
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Elsevier |
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DAG; 600.121; 600.162; 602.230 |
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no |
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Admin @ si @ SFK2022 |
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3736 |
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Author |
Arash Akbarinia; C. Alejandro Parraga |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Feedback and Surround Modulated Boundary Detection |
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Journal Article |
Year |
2018 |
Publication |
International Journal of Computer Vision |
Abbreviated Journal |
IJCV |
Volume |
126 |
Issue |
12 |
Pages |
1367–1380 |
Keywords |
Boundary detection; Surround modulation; Biologically-inspired vision |
Abstract |
Edges are key components of any visual scene to the extent that we can recognise objects merely by their silhouettes. The human visual system captures edge information through neurons in the visual cortex that are sensitive to both intensity discontinuities and particular orientations. The “classical approach” assumes that these cells are only responsive to the stimulus present within their receptive fields, however, recent studies demonstrate that surrounding regions and inter-areal feedback connections influence their responses significantly. In this work we propose a biologically-inspired edge detection model in which orientation selective neurons are represented through the first derivative of a Gaussian function resembling double-opponent cells in the primary visual cortex (V1). In our model we account for four kinds of receptive field surround, i.e. full, far, iso- and orthogonal-orientation, whose contributions are contrast-dependant. The output signal from V1 is pooled in its perpendicular direction by larger V2 neurons employing a contrast-variant centre-surround kernel. We further introduce a feedback connection from higher-level visual areas to the lower ones. The results of our model on three benchmark datasets show a big improvement compared to the current non-learning and biologically-inspired state-of-the-art algorithms while being competitive to the learning-based methods. |
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NEUROBIT; 600.068; 600.072 |
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Admin @ si @ AkP2018b |
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2991 |
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Author |
Francesco Fabbri; Xianghang Liu; Jack R. McKenzie; Bartlomiej Twardowski; Tri Kurniawan Wijaya |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
FedFNN: Faster Training Convergence Through Update Predictions in Federated Recommender Systems |
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Miscellaneous |
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2023 |
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ARXIV |
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Federated Learning (FL) has emerged as a key approach for distributed machine learning, enhancing online personalization while ensuring user data privacy. Instead of sending private data to a central server as in traditional approaches, FL decentralizes computations: devices train locally and share updates with a global server. A primary challenge in this setting is achieving fast and accurate model training – vital for recommendation systems where delays can compromise user engagement. This paper introduces FedFNN, an algorithm that accelerates decentralized model training. In FL, only a subset of users are involved in each training epoch. FedFNN employs supervised learning to predict weight updates from unsampled users, using updates from the sampled set. Our evaluations, using real and synthetic data, show: 1. FedFNN achieves training speeds 5x faster than leading methods, maintaining or improving accuracy; 2. the algorithm's performance is consistent regardless of client cluster variations; 3. FedFNN outperforms other methods in scenarios with limited client availability, converging more quickly. |
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LAMP |
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no |
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Admin @ si @ FLM2023 |
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3980 |
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Author |
Dipam Goswami; Yuyang Liu ; Bartlomiej Twardowski; Joost Van de Weijer |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
FeCAM: Exploiting the Heterogeneity of Class Distributions in Exemplar-Free Continual Learning |
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Conference Article |
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2023 |
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37th Annual Conference on Neural Information Processing Systems |
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Poster |
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New Orleans; USA; December 2023 |
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LAMP |
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no |
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Admin @ si @ GLT2023 |
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3934 |
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Author |
Pedro Martins; Carlo Gatta; Paulo Carvalho |
Title ![sorted by Title field, descending order (down)](img/sort_desc.gif) |
Feature-driven Maximally Stable Extremal Regions |
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Conference Article |
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2012 |
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7th International Conference on Computer Vision Theory and Applications |
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490-497 |
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VISAPP |
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MILAB |
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Admin @ si @ MGC2012 |
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2139 |
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