Search results for "Pattern"

E pluribus unum. Il ruolo del pattern geometrico nella storia dell'arte siciliana

2020

The harmony of forms seems to be regulated by its own laws compatible with the cognitive processes that regulate their perception. From the mimesis of nature, artistic forms investigate the geometric relationships between the parts and define systems of representation that exploit the optical phenomenon of the tessellation to obtain complex configurations from simple polygonal modules were born. The simplest tessellation finds its first application in the mosaic whose origin as a practice is very ancient, evolving up to the Greco-Roman world enriching and differentiating itself in two essential styles, one pictorial and one abstract, both beautifully represented within the Villa Romana del …

The tree of life in the southern porch of the cathedral of Palermo: survey and geometric analysis

2016

This study focuses one of the most puzzling works of art made in Palermo at the end of the medieval age: the tree of life, a rich geometrical decoration with animal and human figures in the southern porch of the Cathedral of Palermo. Topographic and SfM photogrammetric methods produced a detailed orthophoto of the porch. Images collected during restoration have been rectified and superimposed to the orthophoto. The geometrical analysis of the decorative patterns reveals a complex design and meaningful links between the decoration and the general architectural layout of the porch.

La rappresentazione dell'architettura in alcuni rivestimenti musivi di epoca medievale in Sicilia

2019

Nei mosaici che decorano le chiese costruite in Sicilia nel XII dai re normanni compaiono rappresentazioni di edifici. Tali rappresentazioni, come frequentemente accade in epoca pre-rinascimentale, condensano, per accostamento, diverse ‘viste’ dello stesso edificio. La presenza negli edifici normanni di pavimenti e manufatti lignei decorati secondo pattern geometrici, ha suggerito la ricerca di analoghi tracciati nei rivestimenti musivi. L’analisi grafica propone la presenza di quadrati e ottagoni stellati in un mosaico della Cappella palatina di Palermo che raffigura un padiglione coperto da una cupola. Many buildings are depicted in the mosaic panels that enrich the churches built in Sici…

Discriminating Graph Pattern Miningfrom Gene Expression Data

2016

We consider the problem of mining gene expression data in order to single out interesting features characterizing healthy/unhealthy samples of an input dataset. We present an approach based on a network model of the input gene expression data, where there is a labelled graph for each sample. To the best of our knowledge, this is the first attempt to build a different graph for each sample and, then, to have a database of graphs for representing a sample set. Our main goal is that of singling out interesting differences between healthy and unhealthy samples, through the extraction of "discriminative patterns" among graphs belonging to the two different sample sets. Differently from the other…

Forewords-Special Issue Combinatorial Pattern Matching 2011

2013

Preface

2011

Integration of a structural features-based preclassifier and a man-machine interactive classifier for a fast multi-stroke character recognition

2003

A transputer-based parallel machine for handwritten character recognition is proposed. An algorithm based on structural features and on a tree classifier was used to accomplish the pre-classification of the unknown sample in order to speed up the recognition process. The algorithm for the final classification is based on the description of the strokes through Fourier descriptors. The learning phase is accomplished through a man-machine interactive process. The proposed system can expand its knowledge base. A special representation of this knowledge base is proposed in order to record a great amount of data in a suitable way. A fast multistroke handwritten isolated character recognition syst…

Image Segmentation based on Genetic Algorithms Combination

2005

The paper describes a new image segmentation algorithm called Combined Genetic segmentation which is based on a genetic algorithm. Here, the segmentation is considered as a clustering of pixels and a similarity function based on spatial and intensity pixel features is used. The proposed methodology starts from the assumption that an image segmentation problem can be treated as a Global Optimization Problem. The results of the image segmentations algorithm has been compared with recent existing techniques. Several experiments, performed on real images, show good performances of our approach compared to other existing methods.

A Fuzzy One Class Classifier for Multi Layer Model

2009

The paper describes an application of a fuzzy one-class classifier (FOC ) for the identification of different signal patterns embedded in a noise structured background. The classification phase is applied after a preprocessing phase based on a Multi Layer Model (MLM ) that provides a preliminary signal segmentation in an interval feature space. The FOC has been tested on synthetic and real microarray data in the specific problem of DNA nucleosome and linker regions identification. Results have shown, in both cases, a good recognition rate.

A memetic approach to discrete tomography from noisy projections

2010

Discrete tomography deals with the reconstruction of images from very few projections, which is, in the general case, an NP-hard problem. This paper describes a new memetic reconstruction algorithm. It generates a set of initial images by network flows, related to two of the input projections, and lets them evolve towards a possible solution, by using crossover and mutation. Switch and compactness operators improve the quality of the reconstructed images during each generation, while the selection of the best images addresses the evolution to an optimal result. One of the most important issues in discrete tomography is known as the stability problem and it is tackled here, in the case of no…