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The implementation of multi-context systems over coarse-grained reconfigurable platforms could bring several benefits in terms of efficient resource usage and power management. Nevertheless on-the-fly reconfiguration and mapping are not so straightforward and the optimal configuration of the substrate could be extremely time consuming. In this paper we present an early stage design space exploration...
The growing complexity of signal processing algorithms and platforms poses significant challenges to design methods and implementation tools. High-level dataflow programs, such as those in MPEG's RVC-CAL language, provide abstraction and the opportunity for extensive design-space exploration, but they do raise the problem of efficient automatic synthesis to hardware and software. This paper presents...
Chaotic signals have emerging applications which include masking, secure communication and dynamical modeling of biological systems. However, no general methodology for synthesizing chaotic oscillators presently exists. Here, it is shown that chaotic oscillators can be obtained through genetic optimization of the topology of bipolar transistor-based circuits aimed at maximization of approximate signal...
An adaptive multichannel and multiple position room response equalization system is proposed. The room responses are adaptively estimated with good accuracy by reducing the interchannel coherence with a technique based on the missing fundamental phenomenon, that introduces only a mild alteration of the sound timbre. The equalizer is designed in warp frequency domain for improving equalization in the...
Online identification of multiple-input/single-output (MISO) acoustic systems is one of the long-standing and continuing challenges in multichannel speech and audio applications. Fast and robust estimation of the impulse response of an acoustic system is a key requirement for several adaptive solutions in time-varying scenarios, such as stereophonic acoustic echo cancellation, room equalization, or...
As we already know, perceived speech quality of mobile VoIP applications depends on the individual telephone operator where the radio link is not always reliable for the entire duration of a conversation. Moreover, the quality of voice traffic over IP is greatly reduced due to the strong current limitations in terms of requirements regarding delay and guaranteed bandwidth. In particular, the scope...
This paper introduces a new framework for multichannel adaptive filtering, aiming at improving performance of an overall filtering system. The proposed architecture relies on the properties of the adaptive combination of filters which exploits the capabilities of different constituents, thus adaptively providing at least the behaviour of the best performing filter. Applying this concept to multichannel...
Multichannel acoustic echo cancellers are used in teleconferencing systems in order to reduce undesired echoes and to introduce better performance in terms of sound localization in the presence of more than one participant. In this context, stereophonic systems obtain realistic performance, since listeners have spatial information that helps to identify the speaker position. Unfortunately, the correlation...
There are three possible partitionings of the continuous plane into regular polygons that leads to triangular, square, and hexagonal grids. The topology of the square grid is fairly well-understood, but it cannot be said of the remaining two regular sampling schemes. This paper presents a general characterization of simple pixels and some simplified sufficient conditions for topology-preserving operators...
In this article we study the uniqueness of the reconstruction in a special class of 4-connected hv-convex images, using two projections and the so-called morphological skeleton. Generally, if just the two projections are given, there can be exponentially many hv-convex 4-connected images satisfying them. Knowing the morphological skeleton in addition, we can reduce the number of solutions. In the...
In this paper, we consider a binary hexagonal shape image on a triangular grid, with three projections along the three natural directions of the considered coordinate system. We propose an algorithm based on Ryser's theory for reconstructing the original image. In a nutshell, the first step of the reconstruction provides an image that has errorless projection values for two directions applying Ryser's...
Through affordable smartphones and lower costs for mobile internet access, mobile communication by moving and still pictures has become a commonplace. However, while most phones offer a camera for taking pictures, the image processing capabilities are relatively sparse. The challenges that arise with real-time image handling are not yet countered by complex techniques. Because of the limited computation...
Wide-baseline stereo matching is a common problem of computer vision. By the explosion of smartphones equipped with camera modules, many classical computer vision solutions have been adapted to such platforms. Considering the widespread use of various networking options for mobile phones, one can consider a set of smart phones as an ad-hoc camera network, where each camera is equipped with a more...
Recognition of car make and model from frontal images is a common problem in computer vision. We refined existing approaches based on ROIs defined relative to the number plate. Square-Mapped-Gradient features are extracted from the ROI and recognition is accomplished by classification utilizing a learning set. The classifier is evaluated using ground truth data provided manually. Via numerical simulations...
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