In this paper, we developed a fingertip finding algorithm working with a regular diffuser. The proposed algorithm works on images captured by infra-red cameras, settled on one side of the diffuser, observing human gestures taken place on the other side. With diffusion characteristics of the diffuser, we can separate finger-touch from palm-hover events when the user interacts with the diffuser. ...

Fingerprint recognition systems are widely used in the field of biometrics. Many existing fingerprint sensors acquire fingerprint images as the user’s fingerprint is contacted on a solid flat sensor. Because of this contact, input images from the same finger can be quite different and there are latent fingerprint issues that can lead to forgery and hygienic problems. For these reasons, a touchl...

Gaze tracking systems usually utilize near-infrared (NIR) lights and NIR cameras, and the performance of such systems is mainly affected by external light sources that include NIR components. This is ascribed to the production of additional (imposter) corneal specular reflection (SR) caused by the external light, which makes it difficult to discriminate between the correct SR as caused by the N...

In order to capture an eye image of high quality in a gaze-tracking camera, an auto-focusing mechanism is used, which requires accurate focus assessment. Although there has been previous research on focus assessment in the spatial or wavelet domains, there are few previous studies that combine all of the methods of spatial and wavelet domains. Since all of the previous focus assessments in the ...

With 257 species known worldwide (Hansen, 1999; Short & Hebauer, 2006; Short & Fikáček, 2011; Gentili, 2012; Jia et al., 2013a; Jia et al, 2013b; Gentili, 2014), Laccobius Erichson is one of the most diverse genera of Hydrophilidae, most species having a relatively uniform convex, rounded appearance. To date only 26 species are known from sub-Saharan Africa (Gentili, 1981; Hebauer, 2006), 11 of...

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After presenting the multi-channel SAR and the multistatic SAR constellations as the evolutions of present-generation SAR systems, two sets of experiments are proposed to assess their potential applications and validate them, before designing fully operational systems. The experiments from the space are based on the use of the existing SAR together with one or more receiving-only sensors on boa...