High-resolution digital resampling using vector rational filters

Lazhar Khriji, Faouzi Alaya Chelkh, Moncef Gabbouj

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Rational filters are extended to multichannel signal processing and applied to image interpolation. Two commonly used decimation schemes are considered: a rectangular grid and a quincunx grid. For each decimation lattice, we propose a number of adaptive resampling algorithms based on the vector rational filter (VRF). These algorithms exhibit desirable properties such as edge and detail preservation and accurate chromaticity estimation. In these approaches, color image pixels are considered as three-component vectors in the color space. Therefore, the inherent correlation that exists between the different color components is not ignored. This leads to better image quality compared to that obtained by componentwise or marginal processing. Extensive simulations show that multichannel image processing with the proposed algorithms (VRFL) and (VRFd) based on Ip-norm and directional processing, respectively; significantly outperform linear and some nonlinear techniques, e.g., vector FIR median hybrid filters (VFMH). Some images interpolated using VRFL and VRFd are presented for qualitative comparison. These images are free from blockiness and jaggedness, confirming the quantitative results.

Original languageEnglish
Pages (from-to)893-901
Number of pages9
JournalOptical Engineering
Volume38
Issue number5
DOIs
Publication statusPublished - May 1999

Fingerprint

Color
filters
high resolution
color
Processing
Adaptive algorithms
Image quality
grids
Interpolation
Signal processing
Image processing
Pixels
norms
interpolation
image processing
signal processing
pixels
simulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

Cite this

High-resolution digital resampling using vector rational filters. / Khriji, Lazhar; Chelkh, Faouzi Alaya; Gabbouj, Moncef.

In: Optical Engineering, Vol. 38, No. 5, 05.1999, p. 893-901.

Research output: Contribution to journalArticle

Khriji, Lazhar ; Chelkh, Faouzi Alaya ; Gabbouj, Moncef. / High-resolution digital resampling using vector rational filters. In: Optical Engineering. 1999 ; Vol. 38, No. 5. pp. 893-901.
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