Color plane interpolation using alternating projections

• Published in: IEEE transactions on image processing Vol. 11; no. 9; pp. 997 - 1013
• Main Authors: Gunturk, B.K., Altunbasak, Y., Mersereau, R.M.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.09.2002; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Arrays; Color; Digital cameras; Digital filters; Exact sciences and technology; Image processing; Information, signal and communications theory; Interpolation; Lattices; Mean square error methods; Mean square values; Pipelines; Planes; Signal processing; Spline; Tasks; Telecommunications and information theory; Performance evaluation; Color filter; Interpolation; Image processing; Algorithm; Color image; Correlation method
• ISSN: 1057-7149; 1941-0042
• DOI: 10.1109/TIP.2002.801121

Most commercial digital cameras use color filter arrays to sample red, green, and blue colors according to a specific pattern. At the location of each pixel only one color sample is taken, and the values of the other colors must be interpolated using neighboring samples. This color plane interpolation is known as demosaicing; it is one of the important tasks in a digital camera pipeline. If demosaicing is not performed appropriately, images suffer from highly visible color artifacts. In this paper we present a new demosaicing technique that uses inter-channel correlation effectively in an alternating-projections scheme. We have compared this technique with six state-of-the-art demosaicing techniques, and it outperforms all of them, both visually and in terms of mean square error.