Now showing items 1-11 of 11

  • Application of Shape-Independent Orthogonal Transforms for Image Interpolation 

    Polec, J.; Pavlovicova, J.; Karlubikova, T. (Společnost pro radioelektronické inženýrství, 2002-04)
    In the contribution we develop a new method for object-oriented interpolation of images. It is an important tool in image processing, since using interpolation we can considerably decrease amount of data, necessary for ...
  • A Comparison of Selected GBN ARQ Schemes for Variable-Error-Rate Channel Using QAM 

    Alexova, P.; Kosut, P.; Polec, J.; Kotuliakova, K. (Společnost pro radioelektronické inženýrství, 2002-09)
    In non-stationary channels, error rates vary considerably. The paper compares Yao's Adaptive Go-back-N (GBN) Automatic-Repeat-Request (ARQ) scheme with Adaptive go-back-N with sliding window mechanism which both estimate ...
  • Discrete Orthogonal Transforms and Neural Networks for Image Interpolation 

    Oravec, M.; Polec, J. (Společnost pro radioelektronické inženýrství, 1999-09)
    In this contribution we present transform and neural network approaches to the interpolation of images. From transform point of view, the principles from [1] are modified for 1st and 2nd order interpolation. We present ...
  • An Effective Go-Back-N Automatic-Repeat-Request Scheme for Variable-Error-Rate Channels 

    Kosut, P.; Polec, J.; Diaz, P.; Menhart, P. (Společnost pro radioelektronické inženýrství, 1999-12)
    In non stationary channels, error rates vary considerably. This paper proposes an effective go-back-N (GBN) Automatic-Repeat-Request (ARQ) scheme which estimates the channel state in a simple manner, and adaptively switches ...
  • Error Concealment using Neural Networks for Block-Based Image Coding 

    Pavlovicova, J.; Oravec, M.; Polec, J.; Kelesi, M.; Mokos, M. (Společnost pro radioelektronické inženýrství, 2006-06)
    In this paper, a novel adaptive error concealment (EC) algorithm, which lowers the requirements for channel coding, is proposed. It conceals errors in block-based image coding systems by using neural network. In this ...
  • Extrapolation of Incomplete Image Data with Discrete Orthogonal Transforms 

    Karlubikova, T.; Polec, J. (Společnost pro radioelektronické inženýrství, 2004-12)
    In image processing and transmission, interpolation and extrapolation are of great importance whenever missing pixels have to be filled in, and many methods have been proposed to solve this problem. In this paper we present ...
  • Hybrid Scheme with Triangulations for Transform Coding 

    Partyk, M.; Polec, J.; Kolingerova, I. (Společnost pro radioelektronické inženýrství, 2003-09)
    Our approach to image region approximation offers a complete scheme consisting of several steps. We separate the encoding of region boundaries from the texture description. The original image is first segmented using an ...
  • A Novel Technique of Error Concealment Method Selection in Texture Images Using ALBP Classifier 

    Tothova, Z.; Polec, J. (Společnost pro radioelektronické inženýrství, 2010-06)
    There are many error concealment techniques for image processing. In the paper, the focus is on restoration of image with missing blocks or macroblocks. Different methods can be optimal for different kinds of images. In ...
  • Segmentation Based Image Scanning 

    Pracko, R.; Polec, J.; Hasenohrlova, K. (Společnost pro radioelektronické inženýrství, 2007-06)
    The submitted paper deals with separate scanning of individual image segments. A new image processing approach based on image segmentation and segment scanning is presented. The resulting individual segments 1-dimensional ...
  • A Three-Level Hierarchical Encoder Using Shape Independent Transform 

    Mojzes, M.; Polec, J. (Společnost pro radioelektronické inženýrství, 2007-06)
    In this paper a scheme for utilizing shape independent basis functions for a hierarchical multiresolution image compression is shown. First, an image is segmented and its segments\' boundaries are polygon approximated, ...
  • Throughput Analysis of an Adaptation Rule in the HARQ Environment 

    Goga, S.; Polec, J.; Kotuliakova, K. (Společnost pro radioelektronické inženýrství, 2003-06)
    In this paper we analyze the adaptation rule, which estimates the channel state and switches between hybrid ARQ (automatic-repeat-request) and pure ARQ. Convolutional code was chosen as FEC (forward-error-correction) in ...