4.5 Article

Accurate reversible color-to-gray mapping algorithm without distortion conditions

Journal

PATTERN RECOGNITION LETTERS
Volume 31, Issue 15, Pages 2405-2414

Publisher

ELSEVIER
DOI: 10.1016/j.patrec.2010.07.014

Keywords

Reversible color mapping; Color-to-gray; Image hiding; Color embedding

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This paper proposes an accurate reversible algorithm without any distortion conditions such as a print-san process for converting full color images to gray images while preserving the chroma and spatial resolution of the images. In our previous study, we proposed a reversible color-to-gray algorithm using a second-level Haar wavelet transform with a packet assignment technique. We have improved this algorithm by devising a color embedding technique. The proposed algorithm distributes color information effectively in the one-level wavelet subbands for preserving the chroma and spatial resolution. Experimental results show that the proposed algorithm can achieve a higher accuracy of recovering color images from the textured gray images of the original color images. We also present a practical application of the proposed algorithm to a color-hiding image transmission; this application permits color recovery only to a specific user with a key. (C) 2010 Elsevier B.V. All rights reserved.

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