Deutsche Telekom

About: Deutsche Telekom is a company organization based out in Welwyn Garden City, United Kingdom. It is known for research contribution in the topics: Telecommunications network & Signal. The organization has 3473 authors who have published 5208 publications receiving 65429 citations. The organization is also known as: DTAG & German Telecom.

Bit allocation for multiview image compression using cubic synthesized view distortion model

Abstract: “Texture-plus-depth” has become a popular coding format for multiview image compression, where a decoder can synthesize images at intermediate viewpoints using encoded texture and depth maps of closest captured view locations via depth-image-based rendering (DIBR). As in other resource-constrained scenarios, limited available bits must be optimally distributed among captured texture and depth maps to minimize the expected signal distortion at the decoder. A specific challenge of multiview image compression for DIBR is that the encoder must allocate bits without the knowledge of how many and which specific virtual views will be synthesized at the decoder for viewing. In this paper, we derive a cubic synthesized view distortion model to describe the visual quality of an interpolated view as a function of the view's location. Given the model, one can easily find the virtual view location between two coded views where the maximum synthesized distortion occurs. Using a multiview image codec based on shape-adaptive wavelet transform, we show how optimal bit allocation can be performed to minimize the maximum view synthesis distortion at any intermediate viewpoint. Our experimental results show that the optimal bit allocation can outperform a common uniform bit allocation scheme by up to 1.0dB in coding efficiency performance, while simultaneously being competitive to a state-of-the-art H.264 codec.

Theoretical bit error rate for uncoded and coded data transmission in digital audio broadcasting

Abstract: In this paper we analyze the bit error rate of an OFDM multicarrier transmission system with DQPSK modulation and differential phase detection both for uncoded and convolutionally coded data. Formulas are derived which take into account the influence of the fast Rician fading channel, but they are valid for multipath Rayleigh fading and the additive Gaussian noise channel as well. Theoretical bit error rates are given for system parameters and channel models proposed for digital audio broadcasting (DAB) in Europe. A comparison with results obtained by a DAB software simulation tool (developed by the same authors) shows good agreement and demonstrates the applicability of the derived set of formulas as a powerful tool for DAB network planning.

Ionizing radiation for fabrication of optical waveguides in polymers

Abstract: Ionizing radiation (light ions up to 200 keV and UV radiation with λ Compaction of the irradiated areas leads to diffractive structures. Changes in the chemical structures of the irradiated samples are reported. The physical properties like mode spectra and attenuation were measured. Passive components with fibers coupled to the devices were fabricated.

Bayesian Imitation of Human Behavior in Interactive Computer Games

Abstract: Modern interactive computer games provide the ability to objectively record complex human behavior, offering a variety of interesting challenges to the pattern-recognition community. Such recordings often represent a multiplexing of long-term strategy, mid-term tactics and short-term reactions, in addition to the more low-level details of the player’s movements. In this paper, we describe our work in the field of imitation learning; more specifically, we present a mature, Bayesian-based approach to the extraction of both the strategic behavior and movement patterns of a human player, and their use in realizing a cloned artificial agent. We then describe a set of experiments demonstrating the effectiveness of our model.

Method and apparatus for network and service controlled hybrid access

Abstract: A method for network controlled optimization of hybrid access traffic management for a residential user connected via a hybrid access home gateway, which provides at least two different network links with different technology to a core network, wherein the core network has a connection to the internet, wherein in the core network a Hybrid Access Server is located, includes: extracting by the Hybrid Access Server one or more of the following information: Network link availability, Network link utilization, Quality of Service information with respect to the services requested from the home gateway; and selecting networks links, network traffic routing, and/or service routing by the Hybrid Access Server in communication with the hybrid access home gateway and/or other components in the network.