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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/79651

    Title: 植基於區塊漸進還原之非擴展式視覺機密分享
    Authors: 侯永昌;官振宇;蔡志豐
    Contributors: 淡江大學資訊管理學系
    Keywords: 視覺機密分享;漸進式視覺機密分享;機密影像區塊;藏密學技術;Visual Secret Sharing;Progressive Visual Secret Sharing;Secret Block;Steganography
    Date: 2012-12-01
    Issue Date: 2013-01-07 19:13:12 (UTC+8)
    Publisher: 桃園縣:中華企業資源規劃學會
    Abstract: In the related works of progressive visual secret sharing (PVSS), Wang et al. (2007) and Wang (2009) all have the following drawbacks: (1) The design of the dispatching matrices is not regular. (2) Shares are m-times larger than the original secret image. (3) Restored image's quality is poor. (4) Their schemes are not suitable to apply in grayscale and color secret images. In order to solve the above limitations, we propose a non-expanded PVSS approach, in which the recovery method is based on secret blocks, namely Block-based Progressive Visual Secret Sharing (BPVSS). We divide a secret image into n non-overlapped image blocks, and an additional portion of secret will be restored after superimposing one more transparency. When superimposing any t shares, there have t (2≤t≤n) secret blocks being restored. Compared with other related works, BPVSS has several advantages: (1) The concept of this model is concise, easy to implement, and the number of participants will not be restricted. (2) In the situation of noise-like shares, the contrast of the restored image is 50%, which means that the hidden message can be clearly recognized by the naked eyes. (3) When transparencies are shifted from noise-like into meaningful, the contrast of the stego-image and the restored image will be 25% which is still superior to other related studies. (4) Our scheme is more suitable for grayscale and color secret images than previous related studies. (5) The size of transparencies is the same as the size of secret image.
    Relation: Journal of e-business=電子商務學報 14(4), pp. 575-596
    DOI: 10.6188/JEB.2012.14(4).01
    Appears in Collections:[Graduate Institute & Department of Information Management] Journal Article

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