1,721,161 research outputs found
sistema per la verifica di una corretta procedura di igiene orale
Full text linkSistema per la verifica di una corretta procedura di igiene orale caratterizzato dal fatto di comprendere: una telecamera per visualizzare il viso di una persona che si spazzola i denti con uno spazzolino comprensivo di un marker; mezzi di elaborazione per localizzare i punti salienti di detto viso di una persona; mezzi di elaborazione per localizzare detto spazzolino; mezzi di elaborazione per inseguire i movimenti di detti punti salienti; mezzi di elaborazione per inseguire i movimenti di detto spazzolino; mezzi di elaborazione per calcolare il movimento relativo tra detto viso e detto spazzolino; mezzi di verifica per verificare che detto movimento relativo tra detto viso e detto spazzolino sia conforme ad un movimento relativo prefissato
metodo per il riconoscimento tra un primo oggetto ed un secondo oggetto rappresentati da immagini
No full textIl brevetto la scomposizione dell'immagine dell'oggetto in diverse parti e l'estrazione, per ciascuna di esse di una caratteristica significativa. Il confronto tra le due immagini alle quali è stata applicata la medesima procedura consente di ottenere il grado di similitudine tra i due oggetti confrontat
Method for Recognition Between a First Object and a Second Object Each Represented by Images
No full textTramite la decomposizione dell'immagine di un volto è possibile ottenere una serie di caratteristiche locali che, opportunamente confrontate con le omologhe caratteristiche in un'altra immagine, permette di definire un grado di similarità tra le due immagini e, di conseguenza, tra i due individu
A SYSTEM FOR CHECKING A CORRECT ORAL HYGIENE PROCEDURE
Full text linkA system for checking a correct oral hygiene procedure characterised by comprising: a video camera for acquiring the images of the face of a person brushing their teeth with a toothbrush comprising a marker; processing means for analysing said images and for locating the salient points of said face of a person; processing means for analysing said images and for locating said toothbrush; processing means for following the movements of said salient points; processing means for following the movements of said toothbrush; processing means for calculating the movement between said face and said toothbrush; processing means for checking that said relative movement between said face and said toothbrush corresponds with a relative pre-set movement; where said marker is divided into a plurality of areas; and where each of said plurality of areas is coloured, with a colour chosen from a predefined number of colours, to maximise the colour contrast between said areas close to each other
Fluid Dynamics Without Fluids
Full text linkThis chapter will discuss some interesting real applications where Fluid Dynamics equations found fruitful appliances without dealing with "strictly speaking" fluids. In particular, thanks to the large set of analyses performed over different kinds of fluids in different operating and boundary conditions, a wide range of Computational Fluid Dynamics algorithms flourished tackling different aspects, from convergence rate, to stability according to the discretization, to multigrid and linearization problems. This robust and thorough background, both on the- oretical and on practical aspects, made Computational Fluid Dynamics (CFD) appealing also to other sciences and applications where Fluid Dynamics equations, or similar equations very close to them, can be useful in describing complex phenomena not related to fluids. Some applications that will be discussed concern, e.g., Geometry of liquid snowflakes whose con- tour is growing steered by curvature, staring from a circle. Furthermore Image Restoration and Segmentation can also benefit from CFD since a set of evolutionary algorithms, based on level-set curvature flow equations, plays a fundamental role in steering active contours or snakes through the noise present in the image till the complete warping of the desired framed object. Also in this case advanced techniques like Ghost Fluids Method for two competing fluids dynamics can be used to separate different objects in images. Other interesting appli- cations that will be described concern applicability of CFD to surface extraction from cloud of points. This is a common problem when complex clouds of points, representing 3D objects or scenes are obtained by laser scanners or multi-camera vision systems. These points represent unambiguous features from corners or sharp edges and the final 3D closed surface must fit on these points smoothly interpolating empty space between them. Also in this case CFD can provide useful tools to define the evolution of a 3D surface representing the border between two competing fluids, one representing the "inside" and the other the "outside" of the object itself. The two fluids evolution will stop when surface sticks on all the 3D points: the viscosity of the two fluids will control the smoothness of this surface that will wrap the cloud and tur- bulence is used to model injection into grooves or narrow holes. This chapter will also discuss another interesting application of CFD to robotic navigation in complex environments where we are looking for the best path, both in terms of length and distance from objects, through a set of obstacles, different terrains traversability or path slope. Also in this case an imaginary fluid with a predefined viscosity floods from the robot position through the whole environ- ment, its front evolution speed, accordingly to CFD, will be slower in narrow passages and, once it reaches the target, it will define the easiest way
3D Face Reconstruction from a Single Camera Using a Multi Mirror Set-up
No full text3D face models, thanks to the accuracy and effectiveness of recent devices and techniques for 3D object reconstruction, are extending and enforcing traditional 2D face recognition engines. Using 3D face models allows, in particular, improving recognition robustness with respect to, e.g. non-frontal or partially occluded acquisitions or variations in the lighting conditions. We further discuss some possible applicative scenarios in the conclusions. In this paper we will describe how a set-up with a single hi-resolution camera together with one, two or more planar mirrors can be implemented to provide accurate 3D models of faces: in particular we will tackle the calibration phase of a multi-mirror environment showing advantages with respect to a multi cameras arrangement, we will also propose a possible reconstruction algorithm which uses a global energy-minimization approach to provide an accurate depth-map accounting for surface smoothness, non-convex regions and holes. Examples carried out with both synthetic and real data show that the proposed approach can fruitfully improve accuracy of 2D recognition engines
Toothbrush motion analysis to help children learn proper tooth brushing
No full textToothbrush training is a complex and not fun task for the child nor for the parents or for the dental stuff. Parents and hygienists often report that they are frustrated by poor responses to the training and in most of cases children go home and resume wrong brushing habits, if any. In this paper we present a novel approach where the tooth brushing procedure can become a fun and enjoyable task for kids using a cheap toothbrush accessory and a tablet or a smartphone. The main idea is to apply a simple and cheap 3D colored target at the end of the toothbrush and to track and analyze its motion, imparted by the child. In particular, from the tablet camera it is possible to track both the toothbrush target and the child’s facial parts in order to estimate the brushed dental side. The proposed approach has been tested on seven kids showing good results both in propensity and accuracy after a 20 days period
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