The contrast of any image is a very important characteristic by which the image can be judged as good or poor. In this paper, we introduce a simple approach for the process of image contrast enhancement using the sigmoid function in spatial domain. To achieve this simple contrast enhancement, a novel mask based on using the input value together with the sigmoid function formula in an equation t...

In a recent paper we described a method for assessing the accuracy of polygonal approximation algorithms [16]. Here we develop several measures to assess the stability of such approximation algorithms under variations in their scale parameters. A monotonicity index is introduced that can be applied to analyse the change in the approximation error or the number of line segments against increasin...

Multilinear maps serve as a basis for a wide range of cryptographic applications. The first candidate construction of multilinear maps was proposed by Garg, Gentry, and Halevi in 2013, and soon afterwards, another construction was suggested by Coron, Lepoint, and Tibouchi (CLT13), which works over the integers. However, both of these were found to be insecure in the face of so-called zeroizing ...

Robustness and speed are primary considerations when developing deformation methodologies for animatable mesh objects. The goal of this paper is to present such a robust and fast geometric mesh deformation algorithm. The algorithm is feature points based i.e. it can be applied to enable the animation of various mesh objects defined by the placement of their feature points. As a specific applica...

Please cite this article in press as: Moridis, C. N network-based method. Computers & Education Building computerized mechanisms that will accurately, immediately and continually recognize a learner’s affective state and activate an appropriate response based on integrated pedagogical models is becoming one of the main aims of artificial intelligence in education. The goal of this paper is to d...

There are many methods that address navigation and path planning for mobile robots with non-holonomic motion constraints using clever techniques and exploiting application-specific data, but it is always better not to have any such constraints at all. In this document we re-examine the capabilities of some popular driving mechanisms from a different perspective and describe a method to obtain h...

Functional verification plays a key role in the design verification cycle and the physical fault testing process. There are several functional verification methods that generate tests for modules independent of their implementation ; however, these methods do not scale well for medium to large circuits. In this paper we introduce a new implementation independent functional test generation techn...

Some years ago, Juels et al. introduced the first coercion-resistant Internet voting protocol. Its basic concept is still the most viable approach to address voter coercion and vote selling in Internet voting. However, one of the main open issues is its unrealistic computational requirements of the quadratic-time tallying procedure. In this paper, we examine the cause of this issue, namely the ...

In order to speed-up the procedure for building an emotive/expressive talking head such as LUCIA, an integrated software called INTERFACE was designed and implemented in Matlab©. INTERFACE simplifies and automates many of the operations needed for that purpose. A set of processing tools, focusing mainly on dynamic articulatory data physically extracted by an automatic optotracking 3D movement a...

The present work studies, in detail, the unsteady wall-layer model of Walker et al. (1989, AIAA J., 27, 140 – 149) for the velocity profile in turbulent flows. Two new terms are included in the transcendental nonlinear system of equations that is used to determine the three main model parameters. The mathematical and physical feasible domains of the model are determined as a function of the non...