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Author | Razieh Rastgoo; Kourosh Kiani; Sergio Escalera | ||||
Title | Real-time Isolated Hand Sign Language RecognitioN Using Deep Networks and SVD | Type ![]() |
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Year | 2022 | Publication | Journal of Ambient Intelligence and Humanized Computing | Abbreviated Journal | |
Volume | 13 | Issue | Pages | 591–611 | |
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Abstract | One of the challenges in computer vision models, especially sign language, is real-time recognition. In this work, we present a simple yet low-complex and efficient model, comprising single shot detector, 2D convolutional neural network, singular value decomposition (SVD), and long short term memory, to real-time isolated hand sign language recognition (IHSLR) from RGB video. We employ the SVD method as an efficient, compact, and discriminative feature extractor from the estimated 3D hand keypoints coordinators. Despite the previous works that employ the estimated 3D hand keypoints coordinates as raw features, we propose a novel and revolutionary way to apply the SVD to the estimated 3D hand keypoints coordinates to get more discriminative features. SVD method is also applied to the geometric relations between the consecutive segments of each finger in each hand and also the angles between these sections. We perform a detailed analysis of recognition time and accuracy. One of our contributions is that this is the first time that the SVD method is applied to the hand pose parameters. Results on four datasets, RKS-PERSIANSIGN (99.5±0.04), First-Person (91±0.06), ASVID (93±0.05), and isoGD (86.1±0.04), confirm the efficiency of our method in both accuracy (mean+std) and time recognition. Furthermore, our model outperforms or gets competitive results with the state-of-the-art alternatives in IHSLR and hand action recognition. | ||||
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Notes | HUPBA; no proj | Approved | no | ||
Call Number | Admin @ si @ RKE2022a | Serial | 3660 | ||
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Author | Yasuko Sugito; Trevor Canham; Javier Vazquez; Marcelo Bertalmio | ||||
Title | A Study of Objective Quality Metrics for HLG-Based HDR/WCG Image Coding | Type ![]() |
Journal | ||
Year | 2021 | Publication | SMPTE Motion Imaging Journal | Abbreviated Journal | SMPTE |
Volume | 130 | Issue | 4 | Pages | 53 - 65 |
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Abstract | In this work, we study the suitability of high dynamic range, wide color gamut (HDR/WCG) objective quality metrics to assess the perceived deterioration of compressed images encoded using the hybrid log-gamma (HLG) method, which is the standard for HDR television. Several image quality metrics have been developed to deal specifically with HDR content, although in previous work we showed that the best results (i.e., better matches to the opinion of human expert observers) are obtained by an HDR metric that consists simply in applying a given standard dynamic range metric, called visual information fidelity (VIF), directly to HLG-encoded images. However, all these HDR metrics ignore the chroma components for their calculations, that is, they consider only the luminance channel. For this reason, in the current work, we conduct subjective evaluation experiments in a professional setting using compressed HDR/WCG images encoded with HLG and analyze the ability of the best HDR metric to detect perceivable distortions in the chroma components, as well as the suitability of popular color metrics (including ΔITPR , which supports parameters for HLG) to correlate with the opinion scores. Our first contribution is to show that there is a need to consider the chroma components in HDR metrics, as there are color distortions that subjects perceive but that the best HDR metric fails to detect. Our second contribution is the surprising result that VIF, which utilizes only the luminance channel, correlates much better with the subjective evaluation scores than the metrics investigated that do consider the color components. | ||||
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Notes | CIC | Approved | no | ||
Call Number | SCV2021 | Serial | 3671 | ||
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Author | Gemma Rotger; Francesc Moreno-Noguer; Felipe Lumbreras; Antonio Agudo | ||||
Title | Detailed 3D face reconstruction from a single RGB image | Type ![]() |
Journal | ||
Year | 2019 | Publication | Journal of WSCG | Abbreviated Journal | JWSCG |
Volume | 27 | Issue | 2 | Pages | 103-112 |
Keywords | 3D Wrinkle Reconstruction; Face Analysis, Optimization. | ||||
Abstract | This paper introduces a method to obtain a detailed 3D reconstruction of facial skin from a single RGB image.
To this end, we propose the exclusive use of an input image without requiring any information about the observed material nor training data to model the wrinkle properties. They are detected and characterized directly from the image via a simple and effective parametric model, determining several features such as location, orientation, width, and height. With these ingredients, we propose to minimize a photometric error to retrieve the final detailed 3D map, which is initialized by current techniques based on deep learning. In contrast with other approaches, we only require estimating a depth parameter, making our approach fast and intuitive. Extensive experimental evaluation is presented in a wide variety of synthetic and real images, including different skin properties and facial expressions. In all cases, our method outperforms the current approaches regarding 3D reconstruction accuracy, providing striking results for both large and fine wrinkles. |
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Address | 2019/11 | ||||
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Notes | MSIAU; 600.086; 600.130; 600.122 | Approved | no | ||
Call Number | Admin @ si @ | Serial | 3708 | ||
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Author | Aura Hernandez-Sabate; Lluis Albarracin; F. Javier Sanchez | ||||
Title | Graph-Based Problem Explorer: A Software Tool to Support Algorithm Design Learning While Solving the Salesperson Problem | Type ![]() |
Journal | ||
Year | 2020 | Publication | Mathematics | Abbreviated Journal | MATH |
Volume | 20 | Issue | 8(9) | Pages | 1595 |
Keywords | STEM education; Project-based learning; Coding; software tool | ||||
Abstract | In this article, we present a sequence of activities in the form of a project in order to promote
learning on design and analysis of algorithms. The project is based on the resolution of a real problem, the salesperson problem, and it is theoretically grounded on the fundamentals of mathematical modelling. In order to support the students’ work, a multimedia tool, called Graph-based Problem Explorer (GbPExplorer), has been designed and refined to promote the development of computer literacy in engineering and science university students. This tool incorporates several modules to allow coding different algorithmic techniques solving the salesman problem. Based on an educational design research along five years, we observe that working with GbPExplorer during the project provides students with the possibility of representing the situation to be studied in the form of graphs and analyze them from a computational point of view. |
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Address | September 2020 | ||||
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Notes | IAM; ISE | Approved | no | ||
Call Number | Admin @ si @ | Serial | 3722 | ||
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Author | Joana Maria Pujadas-Mora; Alicia Fornes; Oriol Ramos Terrades; Josep Llados; Jialuo Chen; Miquel Valls-Figols; Anna Cabre | ||||
Title | The Barcelona Historical Marriage Database and the Baix Llobregat Demographic Database. From Algorithms for Handwriting Recognition to Individual-Level Demographic and Socioeconomic Data | Type ![]() |
Journal | ||
Year | 2022 | Publication | Historical Life Course Studies | Abbreviated Journal | HLCS |
Volume | 12 | Issue | Pages | 99-132 | |
Keywords | Individual demographic databases; Computer vision, Record linkage; Social mobility; Inequality; Migration; Word spotting; Handwriting recognition; Local censuses; Marriage Licences | ||||
Abstract | The Barcelona Historical Marriage Database (BHMD) gathers records of the more than 600,000 marriages celebrated in the Diocese of Barcelona and their taxation registered in Barcelona Cathedral's so-called Marriage Licenses Books for the long period 1451–1905 and the BALL Demographic Database brings together the individual information recorded in the population registers, censuses and fiscal censuses of the main municipalities of the county of Baix Llobregat (Barcelona). In this ongoing collection 263,786 individual observations have been assembled, dating from the period between 1828 and 1965 by December 2020. The two databases started as part of different interdisciplinary research projects at the crossroads of Historical Demography and Computer Vision. Their construction uses artificial intelligence and computer vision methods as Handwriting Recognition to reduce the time of execution. However, its current state still requires some human intervention which explains the implemented crowdsourcing and game sourcing experiences. Moreover, knowledge graph techniques have allowed the application of advanced record linkage to link the same individuals and families across time and space. Moreover, we will discuss the main research lines using both databases developed so far in historical demography. | ||||
Address | June 23, 2022 | ||||
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Notes | DAG; 600.121; 600.162; 602.230; 600.140 | Approved | no | ||
Call Number | Admin @ si @ PFR2022 | Serial | 3737 | ||
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Author | Roger Max Calle Quispe; Maya Aghaei Gavari; Eduardo Aguilar Torres | ||||
Title | Towards real-time accurate safety helmets detection through a deep learning-based method | Type ![]() |
Journal | ||
Year | 2023 | Publication | Ingeniare. Revista chilena de ingenieria | Abbreviated Journal | |
Volume | 31 | Issue | 12 | Pages | |
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Abstract | Occupational safety is a fundamental activity in industries and revolves around the management of the necessary controls that must be present to mitigate occupational risks. These controls include verifying the use of Personal Protection Equipment (PPE). Within PPE, safety helmets are vital to reducing severe or fatal consequences caused by head injuries. This problem has been addressed recently by various research based on deep learning to detect the usage of safety helmets by the present people in the industrial field.
These works have achieved promising results for safety helmet detection using object detection methods from the YOLO family. In this work, we propose to analyze the performance of Scaled-YOLOv4, a novel model of the YOLO family that has yet to be previously studied for this problem. The performance of the Scaled-YOLOv4 is evaluated on two public databases, carefully selected among the previously proposed datasets for the occupational safety framework. We demonstrate the superiority of Scaled-YOLOv4 in terms of mAP and Fl-score concerning the previous works for both databases. Further, we summarize the currently available datasets for safety helmet detection purposes and discuss their suitability. |
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Notes | MILAB | Approved | no | ||
Call Number | Admin @ si @ CAA2023 | Serial | 3846 | ||
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Author | Diego Velazquez; Pau Rodriguez; Alexandre Lacoste; Issam H. Laradji; Xavier Roca; Jordi Gonzalez | ||||
Title | Evaluating Counterfactual Explainers | Type ![]() |
Journal | ||
Year | 2023 | Publication | Transactions on Machine Learning Research | Abbreviated Journal | TMLR |
Volume | Issue | Pages | |||
Keywords | Explainability; Counterfactuals; XAI | ||||
Abstract | Explainability methods have been widely used to provide insight into the decisions made by statistical models, thus facilitating their adoption in various domains within the industry. Counterfactual explanation methods aim to improve our understanding of a model by perturbing samples in a way that would alter its response in an unexpected manner. This information is helpful for users and for machine learning practitioners to understand and improve their models. Given the value provided by counterfactual explanations, there is a growing interest in the research community to investigate and propose new methods. However, we identify two issues that could hinder the progress in this field. (1) Existing metrics do not accurately reflect the value of an explainability method for the users. (2) Comparisons between methods are usually performed with datasets like CelebA, where images are annotated with attributes that do not fully describe them and with subjective attributes such as ``Attractive''. In this work, we address these problems by proposing an evaluation method with a principled metric to evaluate and compare different counterfactual explanation methods. The evaluation method is based on a synthetic dataset where images are fully described by their annotated attributes. As a result, we are able to perform a fair comparison of multiple explainability methods in the recent literature, obtaining insights about their performance. We make the code public for the benefit of the research community. | ||||
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Notes | ISE | Approved | no | ||
Call Number | Admin @ si @ VRL2023 | Serial | 3891 | ||
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Author | Patricia Suarez; Henry Velesaca; Dario Carpio; Angel Sappa | ||||
Title | Corn kernel classification from few training samples | Type ![]() |
Journal | ||
Year | 2023 | Publication | Artificial Intelligence in Agriculture | Abbreviated Journal | |
Volume | 9 | Issue | Pages | 89-99 | |
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Abstract | This article presents an efficient approach to classify a set of corn kernels in contact, which may contain good, or defective kernels along with impurities. The proposed approach consists of two stages, the first one is a next-generation segmentation network, trained by using a set of synthesized images that is applied to divide the given image into a set of individual instances. An ad-hoc lightweight CNN architecture is then proposed to classify each instance into one of three categories (ie good, defective, and impurities). The segmentation network is trained using a strategy that avoids the time-consuming and human-error-prone task of manual data annotation. Regarding the classification stage, the proposed ad-hoc network is designed with only a few sets of layers to result in a lightweight architecture capable of being used in integrated solutions. Experimental results and comparisons with previous approaches showing both the improvement in accuracy and the reduction in time are provided. Finally, the segmentation and classification approach proposed can be easily adapted for use with other cereal types. | ||||
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Notes | MSIAU | Approved | no | ||
Call Number | Admin @ si @ SVC2023 | Serial | 3892 | ||
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Author | Petia Radeva; Judit Martinez; A. Tovar; X. Binefa; Jordi Vitria; Juan J. Villanueva | ||||
Title | CORKIDENT: an automatic vision system for real-time inspection of natural products. | Type ![]() |
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Year | 1999 | Publication | Abbreviated Journal | ||
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Address | Wales | ||||
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Notes | OR;MILAB;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ RMT1999 | Serial | 23 | ||
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Author | Jordi Vitria; Petia Radeva; X. Binefa | ||||
Title | EigenHistograms: using low dimensional models of color distribution for real time object recognition | Type ![]() |
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Year | 1999 | Publication | Abbreviated Journal | ||
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Address | Ljubliana, Slovenia, Springer-Verlag | ||||
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Notes | OR;MILAB;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ VRB1999a | Serial | 29 | ||
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Author | D. Rincon; E. Frumento; M. Angel Viñas | ||||
Title | Description of a teleconsultation platform and its interaction with access networks. | Type ![]() |
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Year | 1999 | Publication | V Open European Summer School. 145–150. | Abbreviated Journal | |
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Address | Barcelona | ||||
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Notes | Approved | no | |||
Call Number | ISE @ ise @ RFV1999 | Serial | 32 | ||
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Author | Maria Vanrell; Jordi Vitria; Xavier Roca | ||||
Title | A multidimensional scaling approach to explore the behavior of a texture perception algorithm. | Type ![]() |
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Year | 1997 | Publication | Machine Vision and Applications | Abbreviated Journal | |
Volume | 9 | Issue | Pages | 262–271 | |
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Notes | OR;ISE;CIC;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ VVR1997 | Serial | 35 | ||
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Author | D. Seron; F. Moreso; C. Gratin; Jordi Vitria; E. Condom | ||||
Title | Automated classification of renal interstitium and tubules by local texture analysis and a neural network | Type ![]() |
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Year | 1996 | Publication | Analytical and Quantitative Cytology and Histology | Abbreviated Journal | |
Volume | 18 | Issue | 5 | Pages | 410-9, PMID: 8908314 |
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Notes | OR;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ SMG1996 | Serial | 76 | ||
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Author | Felipe Lumbreras; Joan Serrat | ||||
Title | Segmentation of petrographical images of marbles | Type ![]() |
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Year | 1996 | Publication | Computers and Geosciences. 22(5):547–558 | Abbreviated Journal | |
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Notes | ADAS | Approved | no | ||
Call Number | ADAS @ adas @ LuS1996b | Serial | 82 | ||
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Author | F. Moreso; D. Seron; Jordi Vitria; J.M. Grinyo; F.M. Colome-Serra; N. Pares; J.R. Serra | ||||
Title | Quantification of Interstitial Chronic Renal Damage by means of Texture Analysis. | Type ![]() |
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Year | 1994 | Publication | Kidney International | Abbreviated Journal | |
Volume | 46 | Issue | 6 | Pages | 1721-1727 |
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Notes | OR;MV | Approved | no | ||
Call Number | BCNPCL @ bcnpcl @ MSV1994 | Serial | 113 | ||
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