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

作者：Horiuchi Takahiko^*; Nohara Fuminori; Tominaga Shoji

来源：Pattern Recognition Letters, 2010, 31(15): 2405-2414.

DOI：10.1016/j.patrec.2010.07.014

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

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.

• 出版日期2010-11-1