DlMlTRlOS HATZINAKOS

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he goal of image restoration is to reconstruct the original scene from a degraded observation. This recovery process is critical to many image processing applications. Although classical linear image restoration has been thoroughly studied [ 1, 21, the more difficult problem of blind image restoration has numerous research possibilities. Our objective in(More)
This article provides an overview of the basic research directions in the field of gait analysis and recognition. The recent developments in gait research indicate that gait technologies still need to mature and that limited practical applications should be expected in the immediate future. At present, there is a potential for initial deployment of gait for(More)
The objective of this addendum is to discuss the major approaches we overlooked in the May 1996 article of Signal Processing Magazine (SPM) entitled Blind Image Deconvolution. We would like to discuss them here for completeness along with some other works found in more recent literature. As the area of blind image restoration is a rapidly growing eld of(More)
The impact of nonGaussian impulsive noise combined with Gaussian noise on the performance of the binary transmission is analyzed. The impulsive noise is modeled as an alpha-stable process. The probability of error for optimum, linear and nonlinear receivers is derived. The proposed nonlinear detectors show substantial improvements in performance compared to(More)
An angular representation is proposed for gait analysis and recognition applications. Each human silhouette in a gait sequence is transformed into a low dimensional feature vector consisting of average pixel distances from the center of the silhouette. The proposed approach is very suitable for the processing of imperfectly segmented silhouettes since it is(More)
A self heterodyne system is power inefficient compared to a conventional coherent system, but it has the advantage that simple, low-cost, receivers can be built that are completely immune to any phase noise or frequency offset contributed by the transmitter's RF carrier. This is of particular importance to multicarrier schemes, such as OFDM, that are much(More)
A semiblind approach for equalization and jammers rejection at the base station in wireless communications is presented. It is based on the idea of enlarging the effective length of a known short training sequence by using a few additional information symbols and the finite alphabet property of the communication signals. Simulation results for(More)
Frame and frequency synchronization schemes are critical in the design of OFDM receivers because misalignment in time and/or frequency can lead to loss of orthogonality and ultimately to packet loss. In burst communications, such as IEEE 802.11a WLANs, synchronization must be achieved at the beginning of the packet using only the given preamble. Thus, for(More)
Results previously obtained show that a variable-size burst has the potential to improve spectral efficiency in burst-by-burst wireless communication systems. However the methods proposed were applicable to only a certain class of channels. In this work, an alternative strategy for constructing a variable-size burst based on the minimum description length(More)