From 18.04.04 to 23.04.04, the Dagstuhl Seminar 04172 Perspectives Workshop: Visualization and Image Processing of Tensor Fields was held in the International Conference and Research Center (IBFI), Schloss Dagstuhl. During the seminar, several participants presented their current research, and ongoing work and open problems were discussed. Abstracts of the presentations given during the seminar...

We present a novel family of continuous linear time-frequency transforms adapted to a multitude of (nonlinear) frequency scales. Similar to classical time-frequency or time-scale representations, the representation coefficients are obtained as inner products with the elements of a continuously indexed family of time-frequency atoms. These atoms are obtained from a single prototype function, by ...

In this paper, we propose a method for online subsequence matching between histogram-based stream synopsis structures under the dynamic warping distance. Given a query synopsis pattern, the work continuously identifies all the matching subsequences for a stream as the histograms are generated. To effectively reduce the computation time, we design a Weighted Dynamic Time Warping (WDTW) algorithm...

In this paper, we applied local warping techniques to construct a frame work of image-based morphing for facial expressions animation with low complexity. From the experience we obtained in various spatial transformations, the local warping methods are more adequate for facial expressions morphing. We utilized two transformations that can deal with local deformations: piecewise polynomial trans...

In this paper, we describe some considerations on a speaker-independent word recognition method on a large vocabulary size by the concatenation of syllable templates and a stochastic dynamic time warping method, where syllable templates are taken from spoken words. We got the reference patterns from 216 words uttered by 30 male speakers and recognized the other 200 words uttered by the other 10...

Scalar diffraction calculations, such as the angular spectrum method (ASM) and Fresnel diffraction, are widely used in the research fields of optics, x rays, electron beams, and ultrasonics. It is possible to accelerate the calculation using fast Fourier transform (FFT); unfortunately, acceleration of the calculation of nonuniform sampled planes is limited due to the property of the FFT that im...

Nowadays a wide variety of warping applications is known, like educational ones and entertainment ones. The method presented in this work modifies conventional warping techniques in order to applicate it in ageing facial manipulation. We used ageing curves of facial region to show forward and backward ageing face.

This paper discusses the effect of nonuniform varying communication delay on distributed consensus algorithms in discrete time. After introducing the delayed mathematical model, we first investigate the ergodicity of the delayed system using the properties of scrambling matrices. Subsequently, the effect of nonuniform varying delay on convergence is examined. It is shown theoretically that nonu...

Among the class of block-based motion estimators, warping prediction and overlapped block motion estimation have emerged recently as two of the most eeective inter-frame estimation algorithms. Warping estimation is based on linear operations in the motion eld, while overlapped block estimators are based on a linear sum of motion-based estimators in the intensity eld. In this paper, we propose a...

The inner region of the accretion disk around a magnetized neutron star is subjected to magnetic torques that induce warping and precession of the disk. These torques arise from interactions between the stellar field and the induced electric currents in the disk. We carry out a global analysis of warping/precession modes in a viscous accretion disk, and show that under a wide range of condition...