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Optical Engineering

Efficient image interpolation scheme using hybrid IIR Nyquist filters
Author(s): Tor A. Ramstad; Yao Wang; Sanjit K. Mitra
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Paper Abstract

This paper presents efficient filtering algorithms for the interpolation of sequences using IIR filters. Of the suggested filters, the most efficient in terms of computational complexity consists of a very simple allpass IIR filter in parallel with a pure delay. The nonlinear phase distortions of IIR filters, particularly severe in image processing, are avoided by a zero-phase implementation obtained by a combination of causal and anticausal filters. The proposed approach is more efficient for image zooming applications than other methods and yields visually satisfactory results for most gray-scale images.

Paper Details

Date Published: 1 June 1992
PDF: 7 pages
Opt. Eng. 31(6) doi: 10.1117/12.56181
Published in: Optical Engineering Volume 31, Issue 6
Show Author Affiliations
Tor A. Ramstad, Norwegian Institute of Technology (Norway)
Yao Wang, Polytechnic Univ. (United States)
Sanjit K. Mitra, Univ. of California/Santa Barbara (United States)

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