Secret Image Hiding and Sharing Based on the (t, n)-Threshold

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Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/18457

Title:	Secret Image Hiding and Sharing Based on the (t, n)-Threshold
Authors:	林智揚;Lin, Chih-Yang;Chin-Chen Chang
Contributors:	資訊工程學系
Keywords:	Secret image sharing;steganography;image quantization;(t, n)-threshold secret sharing
Date:	2007
Issue Date:	2012-11-26 05:53:50 (UTC+0)
Abstract:	This study proposes a new secret image sharing method based on the (t, n)-threshold.The sharing method is completed through three main steps: (1) quantizing the secret image, (2) generating n shadows from the quantized image, and (3) sharing the n shadows among n cover images. Our goal is both to attain good stego-image and secret image quality preservation effects and to limit the size of each shadow image down to 1/t of that of the secret image for convenient transmission and storage. In the first step, the secret image is divided into non-overlapping 4 × 4 blocks that are quantized according to the results of block testing. Each block, after the block testing procedure, is judged to be either a smooth block or a non-smooth one. Smooth blocks can be neatly restored after being hidden into the cover image, while non-smooth blocks can be somewhat lossy, but such modification is perceptually invisible. The second step is to apply Shamir’s (t, n)-threshold,which uses a (t−1)-degree polynomial to generate n shadows so that the secret image can be restored from any t out of n shadows. The last step involves a modulo operation to hide the n shadows in n cover images. According to our experimental results, the PSNR values of the reconstructed secret images by our method center around 39 dB, outperforming other recent methods
Relation:	Fundamenta Informaticae,e 76(2007),399–411.
Appears in Collections:	[資訊工程學系] 期刊論文

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