Selection weighted vector directional filters

  • Authors:
  • Rastislav Lukac;Bogdan Smolka;Konstantinos N. Plataniotis;Anastasios N. Venetsanopoulos

  • Affiliations:
  • The Edward S. Rogers Sr. Department of ECE, University of Toronto, 10 King's College Road, Toronto, M5S 3G4, Canada;Department of Automatic Control, Silesian University of Technology, Akademicka 16 Str., 44-101 Gliwice, Poland;The Edward S. Rogers Sr. Department of ECE, University of Toronto, 10 King's College Road, Toronto, M5S 3G4, Canada;The Edward S. Rogers Sr. Department of ECE, University of Toronto, 10 King's College Road, Toronto, M5S 3G4, Canada

  • Venue:
  • Computer Vision and Image Understanding - Special issue on color for image indexing and retrieval
  • Year:
  • 2004

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Abstract

In this paper, a class of weighted vector directional filters (WVDFs) based on the selection of the output sample from the multichannel input set is analyzed and optimized. The WVDF output minimizes the sum of weighted angular distances to other input samples from the filtering window. Dependent on the weighting coefficients, the class of the WVDFs can be designed to perform a number of smoothing operations with different properties, which can be applied for specific filtering scenarios. In order to adapt the weighting coefficients to varying noise and image statistics, we introduce a methodology, which achieves an optimal trade-off between smoothing and detail preserving characteristics. The proposed angular optimization algorithms take advantage of adaptive stack filters design and weighted median filtering framework. The optimized WVDFs are able to remove image noise, while maintaining excellent signal-detail preservation capabilities and sufficient robustness for a variety of signal and noise statistics.