Search results for " visual"
showing 10 items of 1041 documents
Propaganda grafico-persuasiva. Segni, forme, sguardi
2019
A partire da una ricognizione iconografica di alcune delle trasformazioni sociali che nella storia del XX secolo hanno intravisto nel poster un mezzo di comunicazione e nell’immagine un dispositivo per l’informazione capillare, il saggio mira ad approfondire le forme assunte dalle ideologie storiche nei poster di propaganda, le metafore grafiche adottate per divulgare il messaggio e le tecniche persuasive per diffonderne i valori. Non si tratta di una classificazione iconografica strutturata per artista o per periodo storico, ma di un’analisi sull’individuazione di un comune linguaggio per la rappresentazione delle ideologie politiche che in particolari momenti storici si sono intrecciate c…
A cooperating strategy for objects recognition
1999
The paper describes an object recognition system, based on the co-operation of several visual modules (early vision, object detector, and object recognizer). The system is active because the behavior of each module is tuned on the results given by other modules and by the internal models. This solution allows to detect inconsistencies and to generate a feedback process. The proposed strategy has shown good performance especially in case of complex scene analysis, and it has been included in the visual system of the DAISY robotics system. Experimental results on real data are also reported.
MIS: Macro Icon System to generate macro algorithms for image analysis in parallel processing
1993
La Stima Temporale come Misura della Complessità Percettiva di Combinazioni di Stimoli Visivi-Uditivi
2007
La letteratura sulla percezione del tempo è concorde nell’evidenziare che gli esseri umani sono poco accurati nei giudizi temporali, nel senso che solitamente tendono sovrastimare o a sottostimare le durate. I numerosi studi condotti al riguardo divergono, tuttavia, nei meccanismi cognitivi chiamati in causa per spiegare i suddetti biases temporali. In particolare, i modelli basati sulla memoria prevedono che compiti complessi, a causa del maggiore spazio mnestico richiesto, inducano gli individui a sovrastimarne la durata. Diversamente,i modelli basati sull’attenzione evidenziano come l’elevato carico cognitivo sotteso a compiti complessi si traduca nella tendenza a sottostimarne la durata…
E-LEARNING AND ART OF PROGRAMMING: A CONTEXT ORIENTED TO
2017
Coding or programming is very important for a number of tasks and this is true not only in problem solving but also in the computer science and over. Many skills have to be acquired before to have a high familiarity degree with this science. In the studies for methods of coding, students have a great problem for understanding on how to solve and to develop algorithms in a rational way, thus the expertise on how to solve and to develop algorithms is the most difficult to acquire for all students in whatever age. This paper introduces the prototype of a framework able to running in the web space and to be supported by different devices and browsers, useful to integrate a number of collaborati…
Sustainable lighting design through the analysis of spatial and time non-uniformities in natural lighting with the metric of the information theory
2014
The indoor visual comfort of subjects faced with indoor ambient lighting varies with the position of the subject and is not constant over time. Average performance indexes, such as the mean value of Daylight Factor and Daylight Autonomy, are commonly used to analyse lighting distribution. These indexes, however, don’t properly take into account either the spatial or the time distribution of values affecting the non-uniformity of environmental lighting. Indeed, these are limited to the definition of a mean value or to the assessment of time availability of daylighting. This paper examines spatial and temporal non-uniformities in indoor lighting as possible causes of discomfort for occupants.…
Indoor lighting quality: Effects of different wall colours
2016
This paper reports the results of measurements performed in a test room to investigate the impact of using different wall colours and light scenes on indoor lighting quality. Eye level spectral irradiances were measured for a user located inside the room and seated at a desk. These measurements allow the use of the Irradiance Toolbox, which makes it possible to calculate equivalent illuminances for the photopigments in the human eye. Moreover, the CIECAM02 colour appearance model was used to investigate the variations in hue and chroma values of the different wall colours when changing the light scene. The results demonstrate that there are significant variations in eye level spectral irra…
Assessing lighting quality in indoor environments
Simulated Annealing Technique for Fast Learning of SOM Networks
2011
The Self-Organizing Map (SOM) is a popular unsupervised neural network able to provide effective clustering and data visualization for multidimensional input datasets. In this paper, we present an application of the simulated annealing procedure to the SOM learning algorithm with the aim to obtain a fast learning and better performances in terms of quantization error. The proposed learning algorithm is called Fast Learning Self-Organized Map, and it does not affect the easiness of the basic learning algorithm of the standard SOM. The proposed learning algorithm also improves the quality of resulting maps by providing better clustering quality and topology preservation of input multi-dimensi…
Video object recognition and modeling by SIFT matching optimization
2014
In this paper we present a novel technique for object modeling and object recognition in video. Given a set of videos containing 360 degrees views of objects we compute a model for each object, then we analyze short videos to determine if the object depicted in the video is one of the modeled objects. The object model is built from a video spanning a 360 degree view of the object taken against a uniform background. In order to create the object model, the proposed techniques selects a few representative frames from each video and local features of such frames. The object recognition is performed selecting a few frames from the query video, extracting local features from each frame and looki…