1999/2

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    Interactive Progressive Image Transmission
    (Společnost pro radioelektronické inženýrství, 1999-06) Matus, E.; Levicky, D.
    In progressive image transmission (PIT) the image is transmitted progressively i.e. the low detail image is transmitted as first followed by transmission of detail signals. In our contribution we consider interactivity in the PIT. For example, the observer could specify image regions of highest interest (ROI). In this case, the image transmission should be optimised with respect to the ROI. The definition of objective criterion for interactive PIT is made in this paper as first. The spatial signal decomposition is derived with respect to this criterion. Wavelet transform of spatial components is used. At the end demonstration of proposed algorithm is made.
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    Medium Access Control Protocols for Wireless ATM
    (Společnost pro radioelektronické inženýrství, 1999-06) Dobos, L.; Juhar, J.; Cizmar, A.
    The most crucial issues in the conception of an efficient wireless ATM network are the design of the physical layer, data link layer. Medium Access Control (MAC) protocol and mobility management functions. In this article we focus on MAC protocols, namely on requirements for MAC protocols and on basic concepts of TDMA and CDMA based one. For illustration we consider with Time Division Duplex (TDD) as well as Frequency Division Duplex (FDD).
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    Fuzzy Stack Filters for Image Processing
    (Společnost pro radioelektronické inženýrství, 1999-06) Marchevsky, S.; Stupak, Cs.
    This paper is oriented to filtering by fuzzy stack filter of monochromatic images distorted with impulsive noise. Fuzzy stack filter is acquired by extension of stack filters by means of fuzzy logic. Adding some parameters to this filter, that are adjusted by neural adaptation algorithm, is obtained the new class of filters, so-called fuzzy rank-order filters. This class of filters is compared with other well known filters as stack filters and neural stack filters.
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    The State Space Mystery with Negative Load in Multiple-Valued Logic
    (Společnost pro radioelektronické inženýrství, 1999-06) Galajda, P.; Guzan, M.; Spany, V.
    Switching sequential circuits are an indispensable part of many modern electronic devices, such as memory cells, flip-flop sensors, and many others. Since the invention of flip-flop switching circuits, the study of their dynamic behaviour has played an ever-increasing role. The dynamic properties of sequential circuits can be investigated by means of switching between the system's attractors. In this paper the boundary surfaces are discussed that play a crucial role in the process of switching.
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    Motion Analysis Based on Invertible Rapid Transform
    (Společnost pro radioelektronické inženýrství, 1999-06) Gamec, J.; Turan, J.
    This paper presents the results of a study on the use of invertible rapid transform (IRT) for the motion estimation in a sequence of images. Motion estimation algorithms based on the analysis of the matrix of states (produced in the IRT calculation) are described. The new method was used experimentally to estimate crowd and traffic motion from the image data sequences captured at railway stations and at high ways in large cities. The motion vectors may be used to devise a polar plot (showing velocity magnitude and direction) for moving objects where the dominant motion tendency can be seen. The experimental results of comparison of the new motion estimation methods with other well known block matching methods (full search, 2D-log, method based on conventional (cross correlation (CC) function or phase correlation (PC) function) for application of crowd motion estimation are also presented.