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boundary-matching
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Dynamic temporal error concealment for video data in error-prone environments
, Article Iranian Conference on Machine Vision and Image Processing, MVIP ; 2013 , Pages 43-47 ; 21666776 (ISSN) ; 9781467361842 (ISBN) ; Ghanei Yakhdan, H ; Kasaei, S ; Sharif University of Technology
IEEE Computer Society
2013
Abstract
Error concealment is a useful method for improving the damaged video quality in the decoder side. In this paper, a dynamic method with low computational complexity is presented to improve the visual quality of videos when up to 50% of the frames are damaged. In the proposed method, temporal replacement and the improved outer boundary matching algorithm are used for dynamical error concealment in inter-frames of videos. With the use of motion vectors (MVs) which are close to the damaged macroblock (MB) the method can determine whether the motion in specific areas is either regular, irregular, or zero. Then, based on this knowledge, different methods are performed. It adaptively selects a set...
A fast and adaptive boundary matching algorithm for video error concealment
, Article 4th International Conference on Signal Processing and Communication Systems, ICSPCS'2010, Gold Coast, QLD, 13 December 2010 through 15 December 2010 ; 2010 ; 9781424479078 (ISBN) ; Mohammadiha, N ; Kasaei, S ; Sharif University of Technology
2010
Abstract
Low-complexity error concealment techniques for missing macroblock (MB) recovery based on the boundary matching principle are extensively studied and evaluated. In this paper, an improved boundary matching algorithm (BMA) using adaptive search is presented to conceal channel errors in inter-frames of video images. The proposed scheme adaptively selects proper candidate regions to conceal the artifact of a lost block. The candidate regions are examined based on analyzing motion activity of the neighboring MBs. Simulations show that the proposed scheme outperforms both on PSNR and visual quality obviously of about 1-4dB compared to existing methods
Second-Order mode analysis of spoof surface plasmon waveguide
, Article 30th International Conference on Electrical Engineering, ICEE 2022, 17 May 2022 through 19 May 2022 ; 2022 , Pages 161-165 ; 9781665480871 (ISBN) ; Shishegar, A. A ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2022
Abstract
This paper analyzes the second-order mode of the spoof surface plasmon (SSP) waveguide, which consists of PEC pillars (dominos) with finite lateral widths on a PEC ground. The space is first divided into four regions. The electromagnetic fields of each region are then written as TE and TM. The boundary conditions and matching integrals are employed to determine the dispersion relations of the second-order mode of the SSP waveguide consisting of two relations. Inspired by Marcatili's method, the analytical approach is to develop a recently-used method for the first mode of the SSP waveguide. The dispersion relations are then solved; therefore, the dispersion curve is plotted. The analytical...