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- 2019
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Tidskriftsartikel (refereegranskat)
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| 2. |
- Garcia-Salicetti, S., et al.
(författare)
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Biosecure reference systems for on-line signature verification : A study of complementarity
- 2007
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Ingår i: Annales des télécommunications. - : Springer. - 0003-4347 .- 1958-9395. ; 62:1-2, s. 36-61
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we present an integrated research study in On-line Signature Verification undertaken by several teams that participate in the BioSecure Network of Excellence. This integrated work, started during the First BioSecure Residential Workshop, has as main objective the development of an On-line Signature Verification evaluation platform. As a first step, four On-line Signature Verification Systems based on different approaches are evaluated and compared following the same experimental protocol on MCYT signature database, which is the largest existing on-line western signature database publicly available with 16 500 signatures from 330 clients. A particular focus of work documented in this paper is multi-algorithmic fusion in order to study the complementarity of the approaches involved. To this end, a simple fusion method based on the Mean Rule is used after a normalization phase.
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| 3. |
- Biurrun, Idoia, et al.
(författare)
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Benchmarking plant diversity of Palaearctic grasslands and other open habitats
- 2021
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Ingår i: Journal of Vegetation Science. - Oxford : John Wiley & Sons. - 1100-9233 .- 1654-1103. ; 32:4
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Tidskriftsartikel (refereegranskat)abstract
- Journal of Vegetation Science published by John Wiley & Sons Ltd on behalf of International Association for Vegetation Science.Aims: Understanding fine-grain diversity patterns across large spatial extents is fundamental for macroecological research and biodiversity conservation. Using the GrassPlot database, we provide benchmarks of fine-grain richness values of Palaearctic open habitats for vascular plants, bryophytes, lichens and complete vegetation (i.e., the sum of the former three groups). Location: Palaearctic biogeographic realm. Methods: We used 126,524 plots of eight standard grain sizes from the GrassPlot database: 0.0001, 0.001, 0.01, 0.1, 1, 10, 100 and 1,000 m2 and calculated the mean richness and standard deviations, as well as maximum, minimum, median, and first and third quartiles for each combination of grain size, taxonomic group, biome, region, vegetation type and phytosociological class. Results: Patterns of plant diversity in vegetation types and biomes differ across grain sizes and taxonomic groups. Overall, secondary (mostly semi-natural) grasslands and natural grasslands are the richest vegetation type. The open-access file ”GrassPlot Diversity Benchmarks” and the web tool “GrassPlot Diversity Explorer” are now available online (https://edgg.org/databases/GrasslandDiversityExplorer) and provide more insights into species richness patterns in the Palaearctic open habitats. Conclusions: The GrassPlot Diversity Benchmarks provide high-quality data on species richness in open habitat types across the Palaearctic. These benchmark data can be used in vegetation ecology, macroecology, biodiversity conservation and data quality checking. While the amount of data in the underlying GrassPlot database and their spatial coverage are smaller than in other extensive vegetation-plot databases, species recordings in GrassPlot are on average more complete, making it a valuable complementary data source in macroecology. © 2021 The Authors.
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| 4. |
- Garcia-Salicetti, S., et al.
(författare)
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Online Handwritten Signature Verification
- 2009
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Ingår i: Guide to Biometric Reference Systems and Performance Evaluation. - London : Springer London. - 9781848002913 ; , s. 125-165
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- In this chapter, we first provide an overview of the existing main approaches, databases, evaluation campaigns and the remaining challenges in online handwritten signature verification. We then propose a new benchmarking framework for online signature verification by introducing the concepts of “Reference Systems”, “Reference Databases” and associated “Reference Protocols.” Finally, we present the results of several approaches within the proposed evaluation framework. Among them are also present the best approaches within the first international Signature Verification Competition held in 2004 (SVC’2004), Dynamic Time Warping and Hidden Markov Models. All these systems are evaluated first within the benchmarking framework and also with other relevant protocols. Experiments are also reported on two different databases (BIOMET and MCYT) showing the impact of time variability for online signature verification. The two reference systems presented in this chapter are also used and evaluated in the BMEC’2007 evaluation campaign, presented in Chap11. ©Springer 2009
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| 5. |
- Mårild, Staffan, et al.
(författare)
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Parental perceptions of and concerns about child´s body weight in eight European countries - the IDEFICS study
- 2014
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Ingår i: Obesity Reviews. - Chichester : Wiley-Blackwell Publishing Inc.. - 1467-7881 .- 1467-789X. ; 15:S2, s. 105-105
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Tidskriftsartikel (refereegranskat)abstract
- Background: Few studies have studied parental perceptions in different settings of their children's weight in relation to objective measurements.Aim: To evaluate parental perceptions of their child's weight category in relation to anthropometric measurements.Key Methods: This was cross-sectional study of 16 220 children, 2–9 year of age, from eight European countries. Parents completed a questionnaire on their perception of the children's weight and concern for future weight deviations. Objective children's weight categories from the International Obesity Task Force were used.Results: Parental weight perception corresponded overall to children's mean body mass index (BMI) z-scores, but there were exceptions, e.g. 63% of parents to children with overweight marked ‘proper weight’. One-third of the total indicated concern for future underweight, most often in parents of children in the overweight category. The strongest predictor for accurate parental weight perception for children with overweight and obesity was BMI z-score (odds ratio [OR] 7.2, 95% confidence interval [CI] 6.1–8.7). Compared to Southern Europe, ORs for accurate parental weight perception were 4.4 (95% CI 3.3–6.0) in Northern Europe and 3.4 (95% CI 2.7–4.2) in Central Europe.Conclusion: Parents of children categorized as being overweight or obese systematically underestimated weight category. Parents differed regionally in accurate perception of weight.
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| 7. |
- Regber, Susann, 1956-, et al.
(författare)
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Parental perceptions of and concerns about child's body weight in eight European countries – the IDEFICS study
- 2013
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Ingår i: Pediatric Obesity. - Chichester : Wiley-Blackwell. - 2047-6302 .- 2047-6310. ; 8:2, s. 118-129
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVES: To evaluate parental perceptions of and concern about child's body weight and general health in children in a European cohort.DESIGN: Cross-sectional multi-centre study in eight European countries.PARTICIPANTS: 16,220 children, ages 2-9 years.METHODS: Parents completed a questionnaire regarding children's health and weight and concern about overweight and underweight. Objective children's weight categories from the International Obesity Task Force were used. Logistic regression models were utilized to identify predictors of accurate weight perception.RESULTS: Parental weight perception corresponded overall to children's mean body mass index (BMI) z-scores, with important exceptions. About one-third of the total indicated concern about underweight, paradoxically most often parents of children in the overweight or obesity categories. In 63%, parents of children in the overweight category marked 'proper weight'. The strongest predictor for accurate parental weight perception for children with overweight and obesity was BMI z-score (odds ratio [OR] = 7.2, 95% confidence interval [CI] 6.1-8.7). Compared to Southern Europe, ORs for accurate parental weight perception were 4.4 (95% CI 3.3-6.0) in Northern Europe and 3.4 (95% CI 2.7-4.2) in Central Europe.CONCLUSION: Parents of children categorized as being overweight or obese systematically underestimated weight. Parents differed regionally regarding accurate weight perception and concern about overweight and underweight.
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