By Nicolas Courty, Elise Arnaud (auth.), Francisco J. Perales, Robert B. Fisher (eds.)

This publication constitutes the refereed lawsuits of the fifth foreign convention on Articulated movement and Deformable gadgets, AMDO 2008, held in Port d'Andratx, Mallorca, Spain, in July 2008.

The 36 revised complete papers and seven poster papers provided have been rigorously reviewed and chosen from sixty four submissions. The papers are equipped in topical part on special effects: human modelling and animation, human movement: research, monitoring, 3D reconstruction and popularity, multimodal person interplay: VR and ar, speech, biometrics, and complicated multimedia structures: criteria, listed video contents.

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Extra info for Articulated Motion and Deformable Objects: 5th International Conference, AMDO 2008, Port d’Andratx, Mallorca, Spain, July 9-11, 2008. Proceedings

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C Springer-Verlag Berlin Heidelberg 2008 Learning to Look at Humans — What Are the Parts of a Moving Body? 23 a human body model from a video sequence will be to find coherently moving objects (limbs) and to store their outer shapes and connections among them as an abstract model. Coherent motion detection is a basic functionality of the human visual cortex and construction of its artificial counterpart represents a topic of special interest in the computer vision community. Two algorithmic methods are commonly used to tackle this problem: spectral clustering (and related matrix factorization techniques) like [2,3,4,5] and Markov random field-segmentation [6] of moving image pixels.

P. , eN and some similarity function wij defining their pairwise similarity yields a similarity matrix W. Each data element is assigned a degree di , the total amount of similarity ei has with all data elements in E: N wij , di = (1) j=1 and the degree matrix D is the diagonal matrix with Dii = di . The Laplacian matrix L is the difference L = D − W. By analyzing the spectrum and eigenvectors of L or of some normalized form of L, it is possible to detect clusters in the original data E. The main advantages of spectral clustering methods are simplicity of implementation and their ability to cope with arbitrary input data (clusters need not adhere to some a priori known distribution like Gaussian).

1 3D Model Projection An advantage of using ellipsoids for body segments is that the perspective projection from an ellipsoid forms an ellipse and this mapping can be represented in analytical form. Assume that we have a 3D ellipsoid body segment Sk . An arbitrarily rotated and translated ellipsoid in 3D space can be represented as X T A X = 1, where X = T [x, y, z, 1] is the homogeneous coordinate of a point on the surface. We want to project Sk into camera c, which has a 3 × 4 projection matrix P .

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