Giovanni Gallo

University of Catania | UNICT · Department of Mathematics and Computer Science (DMI)

An important feature of the Minoan culture is the pottery of Ka-mares style, that documents the Cretan cultural production between the first half of the II millennium BC. This high level painted pro-duction characterized by the combination of several diverse motifs, presents an enormous decorative repertoire. The extraordinary vari-ety of combinati...

We present a multi-GPU version of GPUSPH, a CUDA implementation of fluid-dynamics models based on the smoothed particle hydrodynamics (SPH) numerical method. The SPH is a well-known Lagrangian model for the simulation of free-surface fluid flows; it exposes a high degree of parallelism and has already been successfully ported to GPU. We extend the...

We produce a spatial probability map of vent opening (susceptibility map) at Etna, using a statistical analysis of structural features of flank eruptions of the last 2 ky. We exploit a detailed knowledge of the volcano structures, including the modalities of shallow magma transfer deriving from dike and dike-fed fissure eruptions analysis on histor...

Wireless Capsule Endoscopy is a commonly used diagnostic technique to explore intestinal regions which are difficult to reach with traditional endoscopy. The large number of images produced by this technology requires the use of computer-aided tools to select only meaningful frames to speed up the analysis time by the expert. This paper proposes a...

The aim of this paper is to present a real-time interaction system for ancient artifacts digitally restored in a virtual environment. Using commercial hardware and open source software, Augmented Reality versions of archaeological artifacts are experienced on mobile devices both in a real outdoor site as well as an indoor museum. The case study for...

We produced a spatiotemporal probability map of vent opening at Mt Etna, using a statistical analysis of structural features of the flank eruptions of the last 2000 years. The methodology is based on the hypothesis that the location and frequency of future events will have the same causal factors as the eruptions occurring in the past. The study is...

We present a multi-GPU version of GPUSPH, a CUDA implementation of fluid-dynamics models based on the Smoothed Particle Hydrodynamics (SPH) numerical method. SPH is a well-known lagrangian model to simulate fluid flows, it exposes a high degree of parallelism and has already been successfully ported to GPU. We extend the GPU-based simulator to run...

This paper reports a research based on analyzing criminal sentences on organized crime activities in Sicily pronounced from 2000 through 2006. For this case study we split the analysis of the textual corpus into three main stages. In the first stage, we collected the criminal sentences from the various courthouses. Since there is not yet a unified...

The MAGFLOW lava simulation model is a cellular automaton developed by the Sezione di Catania of the Istituto Nazionale di Geofisica e Vulcanologia (INGV) and it represents the peak of the evolution of cell-based models for lava-flow simulation. The accuracy and adherence to reality achieved by the physics-based cell evolution of MAGFLOW comes at t...

We have developed a robust and scalable multi-GPU (Graphics Processing Unit) version of the cellular-automaton-based MAGFLOW lava simulator. The cellular automaton is partitioned into strips that are assigned to different GPUs, with minimal overlapping. For each GPU, a host thread is launched to manage allocation, deallocation, data transfer and ke...

A new statistical texton-based method for cloud detection through satellite image analysis is presented. The ultimate goal is to improve the performance of remote sensing techniques used to support the observations of active volcanic processes. The proposed method is a supervised classifier that exploits radiance spatial correlation in satellite im...

In this research study, a system to support medical analysis of intestinal contractions by processing WCE images is presented. Small intestine contractions are among the motility patterns which reveal many gastrointestinal disorders, such as functional dyspepsia, paralytic ileus, irritable bowel syndrome, bacterial overgrowth. The images have been...

The use of stereoscopic visualization has recently been proposed for many applications. Other than for entertainment, stereo viewing is being proposed for robotics and medical teleoperation. This paper proposes to exploit the stereo-camera setup available in stereo-viewing systems for 3D reconstruction. We focus on medical endoscopic applications....

An important feature of the Minoan culture is the pottery of Kamares style, that documents the Cretan cultural production between the first half of the II millennium BC. This high level painted production characterized by the combination of several diverse motifs, presents an enormous decorative repertoire. The extraordinary variety of combinations...

An important feature of the Minoan culture is the pottery of Kamares style, that documents the Cretan cultural production between the first half of the 2nd millennium BC. This high level painted production, characterized by the combination of several diverse motifs, presents an enormous decorative repertoire. The extraordinary variety of combinatio...

A recent digitalization project of the textual and iconographical fund of Department of Archaeology Library of the Catania University, one of the largest and oldest among Italian academies, presented the challenging problem of the iconographical resources on glass plates coated by silver halide. The Library has an archive of about 3,000 glass plate...

Resumen Este papel describe un pipeline virtual de restauración para los platos rotos de cristal en el fondo del Departamento de Estudios Arqueológicos, Filológicos e Históricos de la Universidad de Catania. Este archivo incluye raras imágenes de las actividades de excavación del Departamento en Sicilia y Grecia. Muchos de los platos son dañados y...

Wireless Capsule Endoscopy (WCE) is a technical break-through that allows to produce a video of the entire intestine without surgery. It is reported that a medical clinician spends one or two hours to assess a WCE video. It is hence useful to help the physician to do analysis diagnosis using computerized methods. In this paper an algorithmic inform...

The colossal torso of the god Asclepius, kept into the Castello Maniace during the Spanish domination of Sicily, is now one of the most significant examples of roman statuary in the Syracuse Museum. The recent restoration of the Castello Maniace has been celebrated in 2008 with an exhibition of archaeological finds obtained in the various excavatio...

Wireless Capsule Endoscopy (WCE) integrates wireless transmission with image and video technology. It has been used to examine the small intestine non invasively. Medical specialists look for signicative events in the WCE video by direct visual inspection manually labelling, in tiring and up to one hour long sessions, clinical relevant frames. This...

This paper introduces a parametric space to describe the shape of human breasts. The parameter space has been obtained from a sample of about 40 patient's MRI taken in prone position. The data have been cleaned from noise and disturbances and has been dimensionally reduced using Principal Component Analysis. If two references relative to extremal s...

This paper describes a virtual restoration pipeline for the broken glass plates in the fund of the Department of Archaeological, Philological and Historical Studies of Catania University. This archive includes rare images of the excavation activities of the Department in Sicily and Greece. Several of the plates are damaged and fractured and require...

Satellite data, radiative power of hot spots as measured with remote sensing, historical records, on site geological surveys, digital elevation model data, and simulation results together provide a massive data source to investigate the behavior of active volcanoes like Mount Etna (Sicily, Italy) over recent times. The integration of these heteroge...

This paper proposes a method to recognize scene categories using bags of visual words obtained by hierarchically partitioning into subregion the input images. Specifically, for each subregion the Textons distribution and the extension of the corresponding subregion are taken into account. The bags of visual words computed on the subregions are weig...

The direct visual inspection of WCE video by an expert is a tiring and cost activity and it is a true bottleneck to the widespread application of this diagnostic technique. In this paper we apply the texton approach to characterize with a numeric indicator the sub-sequences of a WCE that show sharp change and that are likely to represent relevant m...

This paper proposes a method to recognize scene categories using bags of visual words obtained hierarchically partitioning into sub- region the input images. Specically, for each subregion the Textons dis- tribution and the extension of the corresponding subregion are taken into account. The bags of visual words computed on the subregions are weigh...

This paper proposes a novel technique to describe the shapes of women breasts in a low dimensional parameter space. The parameterization is obtained applying Principal Component Analysis (PCA) to a data set of about 40 Nuclear Magnetic Resonances of female breasts taken in a prone position. The resulting principal modes may be used as clinical indi...

Simple kidney cysts analysis from CT images is nowadays performed in a direct visual and hardly reproducible way. Computer-aided measurements of simple kidney cysts from CT images may help radiologists to accomplish an objective analysis of the clinical cases under observation. We propose a semi-automatic segmentation algorithm for this task. Exper...

Interpretation of WCE video is nowadays largely left to the visual inspection of a medical specialist. This tedious and time consuming task could greatly benefit from techniques that automatically classify and exclude from further processing the non-relevant frames in the video. To this aim in this paper the construction of an indicator function th...

Holistic representations of natural scenes are an effective and powerful source of information for semantic clas-sification and analysis of arbitrary images. Recently, the frequency domain has been successfully exploited to holistically encode the content of natural scenes in order to obtain a robust representation for scene classification. Despite...

In this paper we present a technique which infers interframe motion by tracking SIFT features through consecutive frames: feature points are detected and their stability is evaluated through a combination of geometric error measures and fuzzy logic modelling. Our algorithm does not depend on the point detector adopted prior to SIFT descriptor creat...

Holistic representations of natural scenes is an eective and powerful source of information for semantic classification and analysis of arbitrary images. Recently, the frequency domain has been successfully exploited to holistically encode the content of natural scenes in order to obtain a robust representation for scene classification. In this pap...

In this paper we address the problem of producing an enlarged picture from a given digital image (zooming). We propose a method that takes into account information about discontinuities or sharp luminance variations while zooming the input picture. This is realized by a nonlinear iterative procedure of the zoomed image and could hence be implemente...

Art often provides valuable hints for technological innova- tions especially in the field of Image Processing and Computer Graphics. In this paper we present a novel method to generate an artificial mosaic starting from a raster input image. This approach, based on Gradient Vector Flow computation and some smart heuristics, permit us to follow the...

Outcome evaluation in cosmetic and reconstructive surgery of the breast is commonly performed visually or employing bi-dimensional photography. The reconstructive process in the era of anatomical implants requires excellent survey capabilities that mainly rely on surgeon experience. In this paper we present a set of parameters to unambiguously esti...

This paper proposes a method to recognize scene categories using bags of visual words obtained hierarchically partitioning into subregion the input images. Specifically, for each subregions the texton histogram and the extension of the sub-region is taken into account. The bags of visual words, obtained in this way, are weighted and used in a simil...

This paper presents a video stabilization algorithm based on the extraction and tracking of scale invariant feature transform features through video frames. Implementation of SIFT operator is analyzed and adapted to be used in a feature-based motion estimation algorithm. SIFT features are extracted from video frames and then their trajectory is eva...

We propose novel techniques for microarray image analysis. In particular, we describe an overall pipeline able to solve the most common problems of microarray image analysis. We pro- pose the microarray image rotation algorithm (MIRA) and the statis- tical gridding pipeline (SGRIP) as two advanced modules devoted to restoring the original microarra...

Diffuse axonal injury (DAI), a major component of traumatic brain injury, is a progressive event that may lead to secondary neuronal death. DAI is thought to be initiated by mechanically-induced increases in axolemmal permeability resulting in disruption of the cytoskeleton and blockade of axonal transport. We report an in vitro model that mimics i...

Art often provides valuable hints for technological innovations especially in the field of Image Processing and Computer Graphics. In this paper we survey in a unified framework several methods to transform raster input images into good quality mosaics. For each of the major different approaches in literature the paper reports a short description a...

A new class of relaxations for the network design problem based on lower planes, i.e., linear lower approximations of the objective function, is introduced. Such relaxations provide lower bounds much sharper than the bounds used so far in branch and bound algorithms for this problem.

Steganography is the art of “secret communication”. Its goal is to transmit a message (information) hidden inside another visible message. The typical visible message used in many steganographic systems is a digital image and the embedded message is usually hidden by working in the Fourier domain. In this paper we present Ramses, a novel approach t...

The paper proposes a new method devoted to identify specific semantic regions on CFA (Color Filtering Array) data images representing natural scenes. Making use of collected statistics over a large dataset of high quality natural images, the method uses spatial features and the Principal Component Analysis (PCA) in the HSL and normalized-RG color s...

In this paper we address the decision problem for a fragment of unquantified formulae of real analysis, which, besides the operators of Tarski’s theory of reals, includes also strict and non-strict predicates expressing comparison, monotonicity, concavity, and convexity of continuous real functions over possibly unbounded intervals.The decision res...

Microarray is a new class of biotechnologies able to help biologist researches to extrapolate new knowledge from biological experiments. Image Analysis is devoted to extrapolate, process and visualize image information. For this reason it has found application also in Microarray, where it is a crucial step of this technology (e.g. segmentation). In...

A new method is proposed to unambiguously define a geometric partitioning of 3D models of female thorax. A breast partitioning scheme is derived from simple geometric primitives and well-defined anatomical points. Relevant measurements can be extrapolated from breast partition. Our method has been tested on a number of breast 3D models acquired by...

Art often provides valuable hints for technological innovations especially in the field of Image Processing and Computer Graphics. In this paper we survey in an unified framework several methods to transform a raster input image into good quality mosaics. The common and different ideas among the methods are reported and described. Finally we try to...

This paper reports a multidisciplinary research between computer science and plastic and reconstructive surgery. In particular, a new method is proposed to unambiguously define a geometric partitioning of a large thoracic area including the breast mound. The new technique uses only well-defined anatomical points, defined and selected by surgeons. A...