6,032 research outputs found
Development of CUiris: A Dark-Skinned African Iris Dataset for Enhancement of Image Analysis and Robust Personal Recognition
Iris recognition algorithms, especially with the
emergence of large-scale iris-based identification systems, must
be tested for speed and accuracy and evaluated with a wide
range of templates – large size, long-range, visible and different
origins. This paper presents the acquisition of eye-iris images
of dark-skinned subjects in Africa, a predominant case of verydark-
brown iris images, under near-infrared illumination. The
peculiarity of these iris images is highlighted from the
histogram and normal probability distribution of their
grayscale image entropy (GiE) values, in comparison to Asian
and Caucasian iris images. The acquisition of eye-images for
the African iris dataset is ongoing and will be made publiclyavailable
as soon as it is sufficiently populated
A Survey on Ear Biometrics
Recognizing people by their ear has recently received significant attention in the literature. Several reasons account for this trend: first, ear recognition does not suffer from some problems associated with other non contact biometrics, such as face recognition; second, it is the most promising candidate for combination with the face in the context of multi-pose face recognition; and third, the ear can be used for human recognition in surveillance videos where the face may be occluded completely or in part. Further, the ear appears to degrade little with age. Even though, current ear detection and recognition systems have reached a certain level of maturity, their success is limited to controlled indoor conditions. In addition to variation in illumination, other open research problems include hair occlusion; earprint forensics; ear symmetry; ear classification; and ear individuality. This paper provides a detailed survey of research conducted in ear detection and recognition. It provides an up-to-date review of the existing literature revealing the current state-of-art for not only those who are working in this area but also for those who might exploit this new approach. Furthermore, it offers insights into some unsolved ear recognition problems as well as ear databases available for researchers
Measuring the Voice Resemblance Extent of Identical (Monozygotic) Twins Using Voiceprints Neutrosophic Domain
The identical twins (Monozygotic) are siblings created from the division of one fertilized egg (zygote), so they will be identical in their genetic characteristics and therefore in their phenotypic traits to a very large extent. Among these traits is the voice or the voiceprint of these twins. This research aims to suggest a method to determine the extent of the similarity and the difference between the voiceprints between the brothers of the identical twins and thus, it is possible to distinguish between their voices. This study relied on using a number of audio clips collected from 35 identical twins. The proposed method is based on the use of the spectrogram that represents the voiceprint of the twins. The spectrogram is a two-dimensional function that can be used in the Neutrosophic Transformation to convert the voiceprints to the Neutrosophic domain represented by three membership functions (True, False, and Indeterminate). The results showed that the average extent of the similarity ratio between twins’ voices (True membership) is 67.6%, the difference ratio (False membership) is 32.3%, and the indeterminacy membership function ratio is 18.2%
Infrared face recognition: a comprehensive review of methodologies and databases
Automatic face recognition is an area with immense practical potential which
includes a wide range of commercial and law enforcement applications. Hence it
is unsurprising that it continues to be one of the most active research areas
of computer vision. Even after over three decades of intense research, the
state-of-the-art in face recognition continues to improve, benefitting from
advances in a range of different research fields such as image processing,
pattern recognition, computer graphics, and physiology. Systems based on
visible spectrum images, the most researched face recognition modality, have
reached a significant level of maturity with some practical success. However,
they continue to face challenges in the presence of illumination, pose and
expression changes, as well as facial disguises, all of which can significantly
decrease recognition accuracy. Amongst various approaches which have been
proposed in an attempt to overcome these limitations, the use of infrared (IR)
imaging has emerged as a particularly promising research direction. This paper
presents a comprehensive and timely review of the literature on this subject.
Our key contributions are: (i) a summary of the inherent properties of infrared
imaging which makes this modality promising in the context of face recognition,
(ii) a systematic review of the most influential approaches, with a focus on
emerging common trends as well as key differences between alternative
methodologies, (iii) a description of the main databases of infrared facial
images available to the researcher, and lastly (iv) a discussion of the most
promising avenues for future research.Comment: Pattern Recognition, 2014. arXiv admin note: substantial text overlap
with arXiv:1306.160
VIRHUS: uma plataforma computacional para a simulação de sinais fisiológicos de humanos virtuais
The ability to access bio-signals of participants for research activity is limited
specially for informal settings like academic projects. These limitations can
be in part overcome it by using software to simulated good enough physiological
data. In this work we propose and develop a computational platform
to simulate (biological signals of ) virtual humans as a service. The system
adopts the concept of digital twin to structure the simulation processes. In this
case, the system is not sensing real participants, rather uses pre-recorded
signals as inputs to auto-encoders that generate realistic synthetic signal for
a virtual human, i.e., a digital twin. The pre-recorded signals used were the
electrocardiogram, electrodermal activity and electromyography signals which
were labeled with the ongoing emotion. The system, VIRHUS, offers an interactive
web environment to create the required virtual humans and manage
the simulation processes. A scalable backend takes care of the asynchronous
generation of signals, that can be streamed to endpoints (and consumed by
external applications) or exported as files, for convenience. As a proof of concept,
the “virtual human” data can be parameterized to include emotional traits
in the bio-signals (happy, sad,...), generating meaningful variations in data for
applications developers.A capacidade de aceder aos biossinais de participantes para actividades de
investigação é limitada, especialmente em contextos informais, tais como projectos
académicos. Estas limitações podem ser parcialmente ultrapassadas
através da utilização de software para simular dados fisiológicos suficientemente
fidedignos. Neste trabalho, propomos e desenvolvemos uma plataforma
computacional para simular (sinais biológicos de ) seres humanos virtuais
como um serviço. O sistema adopta o conceito de réplica digital ("digital
twin") para estruturar os processos de simulação. Neste caso, o sistema não
está a monitorar participantes reais, mas utiliza sinais pré-gravados como entradas
para autocodificadores que geram um sinal sintético realista para um
ser humano virtual, ou seja, uma réplica digital. Os sinais pré-gravados utilizados
foram o electrocardiograma, a actividade electrodérmica e os sinais
electromiográficos que foram marcados com a emoção em progresso. O sistema,
VIRHUS, fornece um ambiente web interactivo para criar os seres humanos
virtuais necessários e gerir os processos de simulação. Um backend
escalável cuida da geração assíncrona de sinais, que podem ser transmitidos
para pontos de acesso programático (e consumidos por aplicações externas)
ou exportados como ficheiros por conveniência. Como prova de conceito, os
dados "humanos virtuais" podem ser parametrizados para incluir traços emocionais
nos biossinais (feliz, triste,...), gerando variações significativas nos
dados para os programadores de aplicações.Mestrado em Engenharia Informátic
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