Optical watermarking based on single-shot-ptychography encoding.
Optical watermarking based on single-shot-ptychography encoding.
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DOI：
10.1364/oe.24.027922
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发表时间：
2016-11
期刊：
影响因子：
3.8
通讯作者：
Wenhui Xu;Hongfeng Xu;Yong Luo;Tuo Li;Yishi Shi
中科院分区：
文献类型：
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作者：
Wenhui Xu;Hongfeng Xu;Yong Luo;Tuo Li;Yishi Shi
针对光水印的应用，提出了一种新的基于单次重叠关联的光编码方法。利用单次曝光重叠关联成像的固有特性，水印在一次曝光中被编码成一系列微小的衍射光斑。这些微小的斑点具有很高的不可感知性和可压缩性，非常适合于光学水印的应用。该水印的安全性主要由其较强的不可感知性以及压缩编码和置乱编码的引入来保证。此外，多针孔阵列的多样性和结构参数也可以作为安全密钥。数值仿真和光学实验均表明了该方法的安全性和易实现性。此外，压缩编码可以大大提高嵌入容量，使多个水印的传输信息和更高的安全性。
A novel optical encoding method based on single-shot ptychography is proposed for the application of optical watermarking. For the inherent properties of single-shot ptychography, the watermark is encoded into a series of tiny diffraction spots just in one exposure. Those tiny spots have high imperceptibility and compressibility, which are quite suitable for the optical watermarking application. The security of the proposed watermarking is mainly supported by the strong imperceptibility, as well as the introduction of compression encoding and scrambling encoding. In addition, the diversity of the multi-pinhole array and the structural parameters can also be served as security keys. Both numerical simulation and optical experiment demonstrate the high security and the easy implementation of the single-shot-ptychography-based optical watermarking. Further, the compression encoding can largely improve the embedding capacity that enables the multiple-watermarking for more transmitted information and higher security.