Open Access

Demosaicking Based on Optimization and Projection in Different Frequency Bands

EURASIP Journal on Image and Video Processing20072008:364142

DOI: 10.1155/2008/364142

Received: 30 July 2007

Accepted: 23 November 2007

Published: 4 December 2007

Abstract

A fast and effective iterative demosaicking algorithm is described for reconstructing a full-color image from single-color filter array data. The missing color values are interpolated on the basis of optimization and projection in different frequency bands. A filter bank is used to decompose an initially interpolated image into low-frequency and high-frequency bands. In the low-frequency band, a quadratic cost function is minimized in accordance with the observation that the low-frequency components of chrominance slowly vary within an object region. In the high-frequency bands, the high-frequency components of the unknown values are projected onto the high-frequency components of the known values. Comparison of the proposed algorithm with seven state-of-the-art demosaicking algorithms showed that it outperforms all of them for 20 images on average in terms of objective quality and that it is competitive with them from the subjective quality and complexity points of view.

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Authors’ Affiliations

(1)
Department of Electrical and Electronic Engineering, Tokyo University of Agriculture and Technology

Copyright

© O. A. Omer and T. Tanaka. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.