Yiannis S. Boutalis

TL;DR: This paper deals with a new low level feature that is extracted from the images and can be used for indexing and retrieval, called "Color and Edge Directivity Descriptor" and incorporates color and texture information in a histogram.

TL;DR: In this article, a maximum power point tracker using fuzzy set theory is presented to improve energy conversion efficiency of photovoltaic (PV) generation, by using a fuzzy cognitive network, which is in close cooperation with the presented fuzzy controller.

TL;DR: The extraction of a new low level feature that combines, in one histogram, color and texture information, named FCTH - Fuzzy Color and Texture Histogram - and results from the combination of 3 fuzzy systems, appropriate for accurately retrieving images even in distortion cases.

TL;DR: By using Stirling's Approximation formula for the factorial and by applying some suitable mathematical properties, a novel, factorial-free direct method can be developed that is not equal to those computed by the original direct method, but they are a sufficiently accurate approximation of them.

TL;DR: This paper studies the existence of solutions of FCMs equipped with continuous differentiable sigmoid functions having contractive or, at least, non-expansive properties and proves that when the weight interconnections fulfill certain conditions, the concept values will converge to a unique solution, regardless of the exact values of the initial concept values perturbations.