SHDM stands for Sphere-Hardening Dither Modulation and is a watermarking algorithm based on quantizing the norm of a vector extracted from the cover work. We show how SHDM can be integrated into a fully commutative watermarking-encryption scheme and investigate implementations in the spatial, DCT, and DWT domain with respect to their fidelity, robustness, capacity, and security of encryption. The watermarking scheme, when applied in the DCT or DWT domain, proves to be very robust against JPEG/JPEG2000 compression. On the other hand, the spatial domain-based approach offers a large capacity. The increased robustness of the watermarking schemes, however, comes at the cost of rather weak encryption primitives, making the proposed CWE scheme suited for low to medium security applications with high robustness requirements.

中文翻译：

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SHDM在交换水印加密中的使用

SHDM代表“硬化球的抖动调制”，它是一种基于量化从封面作品中提取的矢量范数的水印算法。我们将展示如何将SHDM集成到完全可交换的水印加密方案中，并就其保真度，鲁棒性，容量和加密安全性研究空间，DCT和DWT域中的实现。当在DCT或DWT域中应用时，水印方案被证明对JPEG / JPEG2000压缩非常健壮。另一方面，基于空间域的方法提供了很大的容量。然而，水印方案的增加的鲁棒性是以相当弱的加密原语为代价的，这使得所提出的CWE方案适合于具有高鲁棒性要求的中低安全性应用。