提出一种抗干扰强、跨语言通用的文本水印技术。
CoreMark: Toward Robust and Universal Text Watermarking Technique
- 用连续黑像素段作为水印载体，天然抗噪声。
- 可抵抗截图、打印扫描等攻击，且视觉失真小。
- 适配小字体场景，适合多语言文本水印应用。
近年来，文本水印技术受到广泛关注，但仍难以同时实现鲁棒性、通用性和不可感知性。本文提出一种新型嵌入范式CORE，由一系列连续对齐的黑色像素段构成。其核心创新在于传输过程中的固有抗噪性以及在多种语言和字体间的广泛适用性。基于CORE，我们构建了名为CoreMark的文本水印框架：首先动态提取字符中的CORE；然后根据CORE长度选择鲁棒性更强的字符；通过调节CORE厚度嵌入隐藏信息，避免明显视觉失真。此外，设计了一种通用即插即用的强度调制器，可根据字体大小自适应调整嵌入强度以增强小字号下的鲁棒性。实验表明，CoreMark在多种语言和字体下均表现出优异的通用性，相比现有方法，在抵抗截图、打印-扫描及打印相机攻击方面显著提升，同时保持良好不可感知性。
原文摘要 · Abstract (English)
Text watermarking schemes have gained considerable attention in recent years, yet still face critical challenges in achieving simultaneous robustness, generalizability, and imperceptibility. This paper introduces a new embedding paradigm,termed CORE, which comprises several consecutively aligned black pixel segments. Its key innovation lies in its inherent noise resistance during transmission and broad applicability across languages and fonts. Based on the CORE, we present a text watermarking framework named CoreMark. Specifically, CoreMark first dynamically extracts COREs from characters. Then, the characters with stronger robustness are selected according to the lengths of COREs. By modifying the thickness of the CORE, the hidden data is embedded into the selected characters without causing significant visual distortions. Moreover, a general plug-and-play embedding strength modulator is proposed, which can adaptively enhance the robustness for small font sizes by adjusting the embedding strength according to the font size. Experimental evaluation indicates that CoreMark demonstrates outstanding generalizability across multiple languages and fonts. Compared to existing methods, CoreMark achieves significant improvements in resisting screenshot, print-scan, and print camera attacks, while maintaining satisfactory imperceptibility.
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