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

Authors:
Takahiko Horiuchi;Fuminori Nohara;Shoji Tominaga
Affiliations:
Graduate School of Advanced Integration Science, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan;Graduate School of Advanced Integration Science, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan;Graduate School of Advanced Integration Science, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
Venue:
Pattern Recognition Letters
Year:
2010

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Abstract

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.