ASIA unversity:Item 310904400/4402
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 90429/105609 (86%)
造访人次 : 10283550      在线人数 : 76
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻
    ASIA unversity > 資訊學院 > 資訊傳播學系 > 期刊論文 >  Item 310904400/4402


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://asiair.asia.edu.tw/ir/handle/310904400/4402


    题名: Visual cryptography for gray-level images by dithering techniques
    作者: C. C. Lin;W. H. Tsai
    贡献者: Department of Information Communication
    关键词: Visual cryptography;Secret sharing;Watermarking;Dithering
    日期: 2003-01
    上传时间: 2009-11-25 10:31:13 (UTC+8)
    出版者: Asia University
    摘要: A (k,n)-threshold visual cryptography scheme is proposed to encode a secret image into n shadow images, where any k or more of them can visually recover the secret image, but any k−1 or fewer of them gain no information about it. The decoding process of a visual cryptography scheme, which differs from traditional secret sharing, does not need complicated cryptographic mechanisms and computations. Instead, it can be decoded directly by the human visual system. Previous efforts in this topic are almost restricted in processing binary images, which are insufficient for many applications. In this paper, a new visual cryptography scheme suitable for gray-level images is proposed. Instead of using gray subpixels directly to construct shares, a dithering technique is used first to convert a gray-level image into an approximate binary image. Then existing visual cryptography schemes for binary images are applied to accomplish the work of creating shares. The overall effect of the proposed method is the achievement of visual encryption and decryption functions for gray-level images. Some comparisons with a previously proposed method are also made. Some experimental results are shown to prove the feasibility of the proposed method. Finally, an application is mentioned to show its practicability.
    關聯: Pattern Recognition Letters 24 (1-3): 349-358
    显示于类别:[資訊傳播學系] 期刊論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    0KbUnknown548检视/开启
    310904400-4402.doc33KbMicrosoft Word344检视/开启


    在ASIAIR中所有的数据项都受到原著作权保护.


    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈