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Sandic-Stankovic D.,Serbian Institute for Telecommunications and Electronics | Kukolj D.,University of Novi Sad | Le Callet P.,Ecole Polytechnique - Palaiseau
Journal of Electrical Engineering | Year: 2016

The Depth-Image-Based-Rendering (DIBR) algorithms used for 3D video applications introduce geometric distortions affecting the edge coherency in the synthesized images. In order to better deal with specific geometric distortions in the DIBR synthesized images, we propose full-reference metric based on multi-scale pyramid decompositions using morphological filters. The non-linear morphological filters used in multi-scale image decompositions maintain important geometric information such as edges across different resolution levels. We show that PSNR has particularly good agreement with human judgment when it is calculated between detailed images at higher scales of morphological pyramids. Consequently, we propose reduced morphological pyramid peak signal-to-noise ratio metric (MP-PSNR), taking into account only mean squared errors between pyramids' images at higher scales. Proposed computationally efficient metric achieves significantly higher correlation with human judgment compared to the state-of-the-art image quality assessment metrics and compared to the tested metric dedicated to synthesis-related artifacts. © 2016 Faculty of Electrical Engineering and Information Technology, Slovak University of Technology 2016. Source


Sandic-Stankovic D.,Serbian Institute for Telecommunications and Electronics
17th DSP 2011 International Conference on Digital Signal Processing, Proceedings | Year: 2011

The performances of morphological wavelets for 3D volume image decorrelation in lossless image compression are presented. Nonlinear morphological wavelets used in non-redundant multiresolution signal decomposition schemes with perfect reconstruction are very fast for implementation as only integer arithmetic is used. The lifting schemes implementing morphological wavelet transforms avoid quantizers which is attractive property for lossless data compression. The performances of both separable and non-separable 3D morphological wavelet transforms using lifting scheme is evaluated. The computation time of 3D decomposition implemented by morphological wavelets is 3 times shorter than the decomposition time with 5/3 wavelet filters used in JPEG2000 standard with similar decorrelation efficiency for lossless compression. © 2011 IEEE. Source


Suh T.,Serbian Institute for Telecommunications and Electronics | Mitic D.,Serbian Institute for Telecommunications and Electronics | Lebl-Antonic D.,Vojvode Stepe 450 | Lebl A.,Serbian Institute for Telecommunications and Electronics
Acta Polytechnica Hungarica | Year: 2014

In this paper we present the mathematical analysis of engagement of technicians in the teaching (educational) process on the faculty. The technicians receive the requests from professors and assistants. In the case that all technicians are busy in the moment of generating a new request, some of the assistants take over processing of the request. We analyse the probability of unwanted states, i.e. the states when it was necessary to engage the assistants on processing the request, which could have been processed by the technicians, if they had been free. The number of engaged technicians is determined in such a way that the probability of these unwanted states is satisfactorily small, i.e. that these states take available assistants' time in reasonable limits. Source


Mitic D.,Serbian Institute for Telecommunications and Electronics | Lebl A.,Serbian Institute for Telecommunications and Electronics | Markov Z.,Serbian Institute for Telecommunications and Electronics
Acta Polytechnica Hungarica | Year: 2012

The bandwidth of signaling channel with bursty errors can be larger or smaller than the bandwidth of channels with random errors. In this paper, we give the answer to the question: Is it possible in an easy way to determine the relationship between the bandwidths of these two models? First, we define the method that determines the bandwidth of the signaling CCS No7 channel under the influence of random errors, and then the method that determines the bandwidth of the signaling CCS No7 channel under the influence of bursty errors. The paper also gives the procedure, which easily compares the channel bandwidth for these two types of errors. Source


Mitic D.,Serbian Institute for Telecommunications and Electronics | Lebl A.,Serbian Institute for Telecommunications and Electronics | Markov Z.,Serbian Institute for Telecommunications and Electronics
AEU - International Journal of Electronics and Communications | Year: 2015

In this paper we proved that calculation of base station output power depending on traffic nearly always gives smaller values than it is in reality, if Erlang model of the channel group is applied. It is proved that increasing of power is caused by the influence of intra-cell connections. The smaller values of power are also obtained when Erlang model is compared to the case of limited number of users, but the difference in this case is not great. The results of calculation are verified by the comparison to the results of simulation. © 2015 Elsevier GmbH. All rights reserved. Source

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