Circuits, Systems, and Signal Processing

, Volume 35, Issue 2, pp 409–420 | Cite as

An Analog–Digital Hardware for L-Estimate Space-Varying Image Filtering

  • Irena OrovićEmail author
  • Nedjeljko Lekić
  • Srdjan Stanković


An analog–digital hardware solution for implementation of the L-estimate space-varying filtering has been proposed. The considered filter form is based on the robust space/spatial-frequency representation and provides efficient denoising of two-dimensional signals/images corrupted by heavy-tailed noise. Moreover, for images with fast-varying details and textures, the L-estimate filtering outperforms the commonly used filters. However, it requires significant processing time, since the space/spatial-frequency representation is calculated for each pixel, on a window by window basis. Therefore, in order to make it feasible for practical applications, a fast implementation of L-estimate space-varying filtering is proposed using a combined analog–digital approach. It provides efficient real-time processing of images corrupted by strong mixed Gaussian and impulse noise.


Analog–digital hardware Robust space/spatial-frequency distributions L-estimate forms Robust space-varying filtering 


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Irena Orović
    • 1
    Email author
  • Nedjeljko Lekić
    • 1
  • Srdjan Stanković
    • 1
  1. 1.Faculty of Electrical EngineeringUniversity of MontenegroPodgoricaMontenegro

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