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dc.contributor.authorHutt, Hen
dc.contributor.authorEverson, Ren
dc.contributor.authorGrant, Men
dc.contributor.authorLove, Jen
dc.contributor.authorLittlejohn, Gen

© 2014, Springer-Verlag Berlin Heidelberg. The use of citizen science to obtain annotations from multiple annotators has been shown to be an effective method for annotating datasets in which computational methods alone are not feasible. The way in which the annotations are obtained is an important consideration which affects the quality of the resulting consensus annotation. In this paper, we examine three separate approaches to obtaining consensus scores for instances rather than merely binary classifications. To obtain a consensus score, annotators were asked to make annotations in one of three paradigms: classification, scoring and ranking. A web-based citizen science experiment is described which implements the three approaches as crowdsourced annotation tasks. The tasks are evaluated in relation to the accuracy and agreement among the participants using both simulated and real-world data from the experiment. The results show a clear difference in performance between the three tasks, with the ranking task obtaining the highest accuracy and agreement among the participants. We show how a simple evolutionary optimiser may be used to improve the performance by reweighting the importance of annotators.

dc.format.extent1541 - 1552en
dc.titleHow clumpy is my image?: Scoring in crowdsourced annotation tasksen
dc.typeJournal Article
plymouth.journalSoft Computingen
plymouth.organisational-group/Plymouth/00 All current users
plymouth.organisational-group/Plymouth/00 All current users/Academics
plymouth.organisational-group/Plymouth/00 All current users/Academics/Faculty of Science & Engineering
plymouth.organisational-group/Plymouth/00 All current users/Academics/Faculty of Science & Engineering/School of Biological & Marine Sciences
plymouth.organisational-group/Plymouth/Faculty of Science & Engineering
plymouth.organisational-group/Plymouth/Faculty of Science & Engineering/School of Biological & Marine Sciences
dc.rights.embargoperiodNot knownen
rioxxterms.typeJournal Article/Reviewen

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