Construction and detection of digital holographic watermarks

被引：13

作者：

Cheng, CJ ^{[1
]}

Lin, LC

Dal, WT

机构：

[1] Natl Taipei Univ Technol, Dept Electroopt Engn, Taipei 10608, Taiwan

[2] Feng Chia Univ, Dept Commun Engn, Taichung 40724, Taiwan

来源：

OPTICS COMMUNICATIONS | 2005年 / 248卷 / 1-3期

关键词：

optical correlator; digital holography; watermarking;

D O I：

10.1016/j.optcom.2004.12.010

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

This study presents an optical watermarking scheme using a digital holographic technique. The digital holographic watermark is constructed by a modified Mach-Zehnder interferometric architecture and a constant-level embedding algorithm, and the watermark detection is optically implemented using VanderLugt 4-f correlator with a weighting matched filter. The detection procedure is a compromise between perceptual quality and correlation robustness, in which the weighting factor selection rule and optimal threshold for the watermarking scheme are given and analyzed. Additionally, the detected correlation is spatially separable and avoided interference from the cover image. Both analytical and experimental results are presented and discussed. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：105 / 116

页数：12

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