With rapid developments in communications technology and digital multimedia, there has been increasing demand in recent years for realistic broadcasting technology beyond conventional audio-visual media. In response to this demand, this paper presents an example of the construction of a haptic-enabled broadcasting system based on the MPEG-V standard that was established recently. The constructi...

In this paper, we show how a topographic mapping can be created from a product of experts. We learn the parameters of the mapping using gradient descent on the negative logarithm of the probability density function of the data under the model. We show that the mapping, though retaining its product of experts form, becomes more like a mixture of experts during training.

It is possible to combine multiple non-linear probabilistic models of the same data by multiplying the probability distributions together and then renormalizing. A “product of experts” is a very efficient way to model data that simultaneously satisfies many different constraints. It is difficult to fit a product of experts to data using maximum likelihood because the gradient of the log likelih...

This paper studies a market for new projects with endogenous information acquisition by experts (venture capitalists). It nds that the crowd-like behavior of experts is characteristic of investments in new elds where prospects of new projects are unknown but correlated and experts independently collect small bits of information: each expert acquires a signal about a project and invests when the...

Selective encryption of visual data and especially MPEG has attracted a considerable number of researchers in recent years. Scalable visual formats are offering additional functionality, which is of great benefit for streaming and networking applications. The MPEG-2 and MPEG-4 standards provide a scalability profile in which a resolution scalable mode is specified. In this paper we evaluate a s...

MPEG (Moving Pictures Expert Group) is an industrial standard for video processing and is widely used in multimedia applications in the Internet. However , no security provision is speciied in the standard. We conducted an experimental study of previously proposed selective encryption schemes for MPEG video security. This study showed that these methods are inadequate for sensitive applications...

Resumen: La continua aparición de nuevas aplicaciones y formatos de almacenamiento, requiere ordenadores cada vez más potentes y una mayor cantidad de espacio de almacenamiento. Para controlar este tipo de datos y aplicaciones que ocupan cantidades ingentes de espacio en memoria, aparece la compresión. Con el objetivo de demostrar su utilidad, se ha desarrollado un prototipo de una aplicación p...