ASIA unversity:Item 310904400/3967
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 94286/110023 (86%)
造访人次 : 21701763      在线人数 : 501
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


    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/310904400/3967


    题名: A Digital Watermark Based on Hybrid Wavelet and Spatial Domain Technologies
    作者: Alen H. T. Hsu
    贡献者: Department of Computer Science and Information Engineering
    关键词: digital watermark;information hiding;copyright protection;spatial domain;frequency domain;discrete wavelet transform;watermark region of interest (ROI)
    日期: 2005
    上传时间: 2009-11-18 13:13:22 (UTC+0)
    出版者: Asia University
    摘要: Digital watermark is an important technology for information hiding, which focuses in copyright protection. Recently, most of the researchers focus in security and robustness of digital watermark, but few researches in the capacity problem. The more applications can be reached if a large digital watermark can be embedded into the materials.
    This thesis proposes a watermark region of interest (ROI) concept to divide watermark into two parts and embed into frequency domain and spatial domain simultaneously. In the frequency domain, this study uses the discrete wavelet transform to embed the clipped watermark ROI into the transformed low-band. In the spatial domain, uses the least significant bit to embed the unclipped digital watermark. The proposed digital watermark technology not only enhances the capacity, but also holds the security and robustness. The main reason for embedding digital watermark into two domains, that it is very difficult for illegal detection and extraction. Experimental results show the proposed technology with large capacity, high security and robustness is adaptive to solve the image copyright protection.
    In the application of the large digital watermark proposed by this thesis can combine information hiding technology to embed annotations into image for searching and declaration of copyright due to our large digital watermark technology.
    显示于类别:[資訊工程學系] 博碩士論文

    文件中的档案:

    档案 大小格式浏览次数
    0KbUnknown406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