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Un modello e un sistema per l'analisi e la segmentazione del movimento umano. Uno studio sulla danza

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Introduction These phases are preparation, attack, decay, sustain, release and overshoot (Mazzarino, 2003). Laban, talking about gesture, considers three phases: preparation, stroke (execution) and retraction (of the arms back close to the body) (Zhao, 2001). The temporal duration of every phase varies according to its execution: the more difficult or more precise the execution of a certain movement, the longer its arrangement (so the duration of the preparation phase). Posture influences all the three phases (Bindigavanale and Badler, 1998) and an entire paragraph is devoted to this issue, since postural attitudes influence our way to move, act and also to be steady. As in Camurri, Lagerlöf and Volpe’s study our work is focused on dance: in their paper (2002) the three authors approach the genre of modern dance to find a nonpropositional style of movements (since the basis of natural body expression can be developed in terms of dance movements). We dealt with videos about choreographies of contemporary dance. A spontaneous question may be: why a dancer? Why not a simple person moving and doing normal daily activities? Our attention has been focused on dance, since it is an artistic expression of human gesture and the field of dance is enriched by many facets 8 . As already stated, dancers and actors are, in most cases, taught the techniques that can be used to evoke an emotion and they are able to amplify some gestures, postures or defects. They are also able to emphasize some movements or pauses. In fact, not only motion is important in expressive content communication: pauses also play an overriding role. During them the body can assume a particular posture and body postures are often considered as expressive gestures with a relevant function in conveying expressive content to the audience (Argyle, 1980). Moreover, we have tried to focus our work on the analysis of motion regarding the whole body, not just a few joints: literature, instead, is full of researchers who took into account just parts of the body (Cutler and Turk, 1998; Zobl, Wallhoff and Rigoll, 2003; Masoud and Papanikolopoulos, 2003). A main aim for which we have focused on segmentation is that, dealing with movies, it may sometimes be an impossible or heavy task to extrapolate the necessary features without dividing the long stream of moves in minor parts. Within each motion segment, semantic and style information may, then, be extracted. The problem is: which feature is best suited for motion segmentation? Will it allow segmenting according to the same criteria that a human observer (who, normally, notices the changes of actions looking, most of all, at which are the limbs moving, at how much they are moving, etc.) would use? Should it be just one feature or more, according to the type of video and to the performance? 8 More details should be taken into account talking about dance: refer to the paragraph titled “The dance field” for more information.

Anteprima della Tesi di Elisa Rocca

Anteprima della tesi: Un modello e un sistema per l'analisi e la segmentazione del movimento umano. Uno studio sulla danza, Pagina 8

Tesi di Laurea

Facoltà: Ingegneria

Autore: Elisa Rocca Contatta »

Composta da 138 pagine.

 

Questa tesi ha raggiunto 3979 click dal 19/05/2004.

Disponibile in PDF, la consultazione è esclusivamente in formato digitale.