標題: Progressive sharing of an image
作者: Hung, Kuo-Hsien
Chang, Yu-Jie
Lin, Ja-Chen
資訊工程學系
Department of Computer Science
關鍵字: discrete cosine transform (DCT);hiding;sharing;progressive reconstruction;small-size stego images
公開日期: 1-Apr-2008
摘要: We propose a sharing method to progressively reveal a given important image in the recovery phase. In the encoding phase, the distributor utilizes the three frequency bands (low, middle, and high) of the given image to generate shadows according to three prespecified thresholds. In the recovery phase, the secret image cannot be revealed if the number of shadows a team collects is less than the lowest threshold. However, when the number of collected shadows reaches the prespecified low (or middle- or high) threshold, the team can reconstruct a low- (or middle- or high-) quality version of the secret image. In other words, the quality of the reconstructed image depends only on the number of shadows being received, rather than on which of the generated shadows are received. Each noise-like shadow is so small that it can be hidden in an ordinary image that is still several times smaller than the original image. (C) 2008 Society of Photo-Optical Instrumentation Engineers.
URI: http://dx.doi.org/10.1117/1.2911719
http://hdl.handle.net/11536/9531
ISSN: 0091-3286
DOI: 10.1117/1.2911719
期刊: OPTICAL ENGINEERING
Volume: 47
Issue: 4
結束頁: 
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