164,900 research outputs found
3D inference and modelling for video retrieval
A new scheme is proposed for extracting planar surfaces from 2D image sequences. We firstly perform feature correspondence over two neighboring frames, followed by the estimation of disparity and depth maps, provided a calibrated camera. We then apply iterative Random Sample Consensus (RANSAC) plane fitting to the generated 3D points to find a dominant plane in a maximum likelihood estimation style. Object points on or off this dominant plane are determined by measuring their Euclidean distance to the plane. Experimental work shows that the proposed scheme leads to better plane fitting results than the classical RANSAC method
Feature extraction for speech and music discrimination
Driven by the demand of information retrieval, video editing and human-computer interface, in this paper we propose a novel spectral feature for music and speech discrimination. This scheme attempts to simulate a biological model using the averaged cepstrum, where human perception tends to pick up the areas of large cepstral changes. The cepstrum data that is away from the mean value will be exponentially reduced in magnitude. We conduct experiments of music/speech discrimination by comparing the performance of the proposed feature with that of previously proposed features in classification. The dynamic time warping based classification verifies that the proposed feature has the best quality of music/speech classification in the test database
Exact solution at integrable coupling of a model for the Josephson effect between small metallic grains
A model is introduced for two reduced BCS systems which are coupled through
the transfer of Cooper pairs between the systems. The model may thus be used in
the analysis of the Josephson effect arising from pair tunneling between two
strongly coupled small metallic grains. At a particular coupling strength the
model is integrable and explicit results are derived for the energy spectrum,
conserved operators, integrals of motion, and wave function scalar products. It
is also shown that form factors can be obtained for the calculation of
correlation functions. Further, a connection with perturbed conformal field
theory is made.Comment: 12 pages, latex, no figure
Automatic human face detection for content-based image annotation
In this paper, an automatic human face detection approach using colour analysis is applied for content-based image annotation. In the face detection, the probable face region is detected by adaptive boosting algorithm, and then combined with a colour filtering classifier to enhance the accuracy in face detection. The initial experimental benchmark shows the proposed scheme can be efficiently applied for image annotation with higher fidelity
Exact form factors for the Josephson tunneling current and relative particle number fluctuations in a model of two coupled Bose-Einstein condensates
Form factors are derived for a model describing the coherent Josephson
tunneling between two coupled Bose-Einstein condensates. This is achieved by
studying the exact solution of the model in the framework of the algebraic
Bethe ansatz. In this approach the form factors are expressed through
determinant representations which are functions of the roots of the Bethe
ansatz equations.Comment: 11 pages, latex, no figures, final version to appear in Lett. Math.
Phy
Synchronization of Chaotic Maps by Symmetric Common Noise
Synchronization of identical chaotic systems subjected to common noise has
been the subject of recent research. Studies on several chaotic systems have
shown that, the synchronization is actually induced by the non-zero mean of the
noise, and symmetric noise with zero-mean cannot lead to synchronization. Here
it is presented that synchronization can be achieved by {\sl zero-mean} noise
in some chaotic maps with large convergence regions.Comment: 5 pages, 4 figure
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