The majority of present-day distributed applications demand a certain level of service from the transportation network and impose a number of performance requirements on it. Failure to meet these requirements will typically degrade the efficiency of the application and, more importantly, will likely have a detrimental impact on the experience of the end-user. Over the years, a number of frameworks has therefore been proposed that enable transportation networks to guarantee a certain Quality of Service (QoS) and the positive implications of these frameworks on application performance have been established. Due to the growing attention to human factors however, the focus...
In this work is addressed the problem of image and video enhancing. Enhancement is the process of transforming in a more pleasing version the original image. For this task we take advantage of several reference high quality photographs by employing local feature points that are matched reliably in order to find appropriate corresponding regions. First, we present a novel technique for matching images of widely separated views. Our approach is motivated by the recent comprehensive studies where none of the detector/descriptor combinations performed adequately where the camera viewpoint changed substantially. The method is characterized by two main steps that aim...
Bringing together heterogeneous computing devices and appliances gives rise to a pervasive environment where resources interact with each other, such as a mobile phone telling the car’s stereo to mute. Applications deployed in such an environment should be sufficiently dynamic to cope with new conﬁgurations.This goes beyond building context-aware applications that assume a ﬁxed environment as there is no guarantee the conﬁguration does not evolve, making the software developed for the initial situation deprecated. We present models and frameworks that support the development and deployment of pervasive applications that allow the environment conﬁguration to change over time. Computer-augmented resources also...
The regular languages constitute a highly robust class of languages. They can be represented by many different formalisms such as finite automata , regular expressions , finite semigroups , monadic second-order logic , right-linear grammars , quantifier-free first-order updates , ... Regular languages are closed under a wide range of operations and, even more importantly, almost any interesting problem concerning regular languages is decidable. All kinds of aspects of the regular languages have been studied over the past 50 years. From a practical perspective, the most widespread way to specify regular languages is by using regular expressions (REs). They are...
In this dissertation we propose several techniques for acquiring local surface orientation and reflectance properties of small-scale surface details, or the surface mesostructure. Our primary focus is on increasing the applicability by providing an efficient, easy to implement and execute approach, employing solely off-the-shelf hardware components. Basically, our setup consists of a regular digital still camera and a computer screen functioning as a planar illuminant. Light patterns are displayed on the screen, illuminating the surface to be scanned, and reflections are captured by the camera. The recorded images are then processed, yielding a digital representation of the relief and reflectance...