482 research outputs found
A new 2D static hand gesture colour image dataset for ASL gestures
It usually takes a fusion of image processing and machine learning algorithms in order to
build a fully-functioning computer vision system for hand gesture recognition. Fortunately,
the complexity of developing such a system could be alleviated by treating the system as a
collection of multiple sub-systems working together, in such a way that they can be dealt
with in isolation. Machine learning need to feed on thousands of exemplars (e.g. images,
features) to automatically establish some recognisable patterns for all possible classes (e.g.
hand gestures) that applies to the problem domain. A good number of exemplars helps, but
it is also important to note that the efficacy of these exemplars depends on the variability
of illumination conditions, hand postures, angles of rotation, scaling and on the number of
volunteers from whom the hand gesture images were taken. These exemplars are usually
subjected to image processing first, to reduce the presence of noise and extract the important
features from the images. These features serve as inputs to the machine learning system.
Different sub-systems are integrated together to form a complete computer vision system for
gesture recognition. The main contribution of this work is on the production of the exemplars.
We discuss how a dataset of standard American Sign Language (ASL) hand gestures containing
2425 images from 5 individuals, with variations in lighting conditions and hand postures is
generated with the aid of image processing techniques. A minor contribution is given in
the form of a specific feature extraction method called moment invariants, for which the
computation method and the values are furnished with the dataset
Système d'Information Géographique pour l'évaluation de la vulnérabilité au risque de ruissellement urbain
Colloque avec actes et comité de lecture. International.International audienc
Polish version of the Cognitive Distortions Scale (CDS): Preliminary validation and personality correlates
BackgroundThe aim of the two research studies presented in this article was to test the reliability and validity of the Polish version of the Cognitive Distortions Scale (CDS). The relation of the CDS to psychological measures of well-being and other theoretically relevant variables was also explored.Participants and procedureTwo correlational studies were conducted with psychology undergraduate students and their family members (n = 196 and n = 90, respectively). Participants completed a paper-pencil set of questionnaires that contained measures of cognitive errors (study 1) and scales related to perceived quality of life and psychological well-being (study 2).ResultsPreliminary results supported the reliability of the Polish version of CDS (with Cronbach’s α .91 and .90) and convergent validity as indicated by correlations with maladaptive self-views and perceived relationship quality.ConclusionsThe Polish version of CDS appears to be a reliable and valid measure of cognitive distortions
Predicting tuberculosis drug resistance with machine learning-assisted Raman spectroscopy
Tuberculosis (TB) is the world's deadliest infectious disease, with 1.5
million annual deaths and half a million annual infections. Rapid TB diagnosis
and antibiotic susceptibility testing (AST) are critical to improve patient
treatment and to reduce the rise of new drug resistance. Here, we develop a
rapid, label-free approach to identify Mycobacterium tuberculosis (Mtb) strains
and antibiotic-resistant mutants. We collect over 20,000 single-cell Raman
spectra from isogenic mycobacterial strains each resistant to one of the four
mainstay anti-TB drugs (isoniazid, rifampicin, moxifloxacin and amikacin) and
train a machine-learning model on these spectra. On dried TB samples, we
achieve > 98% classification accuracy of the antibiotic resistance profile,
without the need for antibiotic co-incubation; in dried patient sputum, we
achieve average classification accuracies of ~ 79%. We also develop a low-cost,
portable Raman microscope suitable for field-deployment of this method in
TB-endemic regions
A Dynamic Knowledge Management Framework for the High Value Manufacturing Industry
Dynamic Knowledge Management (KM) is a combination of cultural and technological factors, including the cultural factors of people and their motivations, technological factors of content and infrastructure and, where these both come together, interface factors. In this paper a Dynamic KM framework is described in the context of employees being motivated to create profit for their company through product development in high value manufacturing. It is reported how the framework was discussed during a meeting of the collaborating company’s (BAE Systems) project stakeholders. Participants agreed the framework would have most benefit at the start of the product lifecycle before key decisions were made. The framework has been designed to support organisational learning and to reward employees that improve the position of the company in the market place
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