Ville-Veikko Mattila

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(a) (b) (c) Figure 1: Our novel Augmented Reality X-ray system (a) provides users with more high-level context of the occluder object than our previous system (b). In this example, important visual landmarks such as the white umbrellas are preserved. We achieve this effect by determining important visual landmarks through saliency maps (c). ABSTRACT In the(More)
A subjective test was developed suitable for evaluating the effect of mobile communications devices on sentence intelligibility in background noise. Originally a total of 25 lists, each list including 16 sentences, were developed in British English and Finnish to serve as the test stimuli representative of adult language today. The sentences, produced by(More)
The ubiquity of smart-phones makes them the de facto platform for outdoor mixed and augmented reality. While there has been a surge in sensor-based Augmented Reality applications, many unsolved technical challenges must be overcome before an ideal mobile AR client can be built. While solutions are being developed, we have investigated using 3D mirror world(More)
Recently, mobile augmented reality (AR) applications are becoming popular and allow normal users to see an enhanced real world through their mobile camera. Creating AR content however is tedious and traditionally done on desktop environments by professionals, with extensive knowledge and/or even programming skills required. In this paper, we introduce a(More)
LiDAR (light detection and ranging) 3D points (both terrestrial and airborne) have recently become a prevalent type of geospatial data. However, this large-scale data poses significant technical challenges for efficient access and visualization. One approach is to generate points with different density levels, i.e. Multi-resolution data sets that can be(More)
This paper proposes a 3D map augmented photo gallery mobile application that allows user to virtually transit from 2D image space to the 3D map space, to expand the field of view to surrounding environments that are not visible in the original image, and to change viewing angles among different global registered images during the image browsing. The(More)
This article deals with certain preliminary findings obtained in a long-term prospective study begun in 1982 using the interview method; the first follow-up was carried out in 1986, the method consisting of a postal inquiry and the collection of recorded data. The sample consists of 200 randomly selected inhabitants of Turku born in 1920 and 189 individuals(More)
This study, which was carried out as part of the TURVA project on psychosocial adaptation in old age, is concerned with the significance of social support to people approaching retirement age. The population consisted of 200 urban dwellers and 189 rural dwellers, who were studied at the age of 62. The subjects were either about to retire in the near future(More)