用红外墨水在纸上藏信息，人眼看不见，机器能读。
Imprinto: Enhancing Infrared Inkjet Watermarking for Human and Machine Perception
- 用红外墨水和摄像头实现隐形信息嵌入
- 通过机器学习检测不可见的红外内容
- 适合需要美观纸质文档的交互设计
混合纸面界面利用增强现实，将纸质文档的触感与数字媒体的交互能力结合。传统方法如二维码会破坏印刷美感并占用视觉空间。为此，我们提出 Imprinto，一种基于市售红外墨水和摄像头的红外喷墨水印技术，可在不被肉眼察觉的情况下嵌入虚拟内容。该技术基于心理物理学实验，研究了在不同背景色下可容忍的最大红外墨水量而不被感知。我们证明了可通过机器学习管道检测到不可见的红外内容，并开发了一个创作工具，用于优化输入文档中彩色区域的红外墨水用量，以兼顾机器与人类的可检测性。最后，我们展示了多个应用，包括增强纸质文档和物体。
原文摘要 · Abstract (English)
Hybrid paper interfaces leverage augmented reality to combine the desired tangibility of paper documents with the affordances of interactive digital media. Typically, virtual content can be embedded through direct links (e.g., QR codes); however, this impacts the aesthetics of the paper print and limits the available visual content space. To address this problem, we present Imprinto, an infrared inkjet watermarking technique that allows for invisible content embeddings only by using off-the-shelf IR inks and a camera. Imprinto was established through a psychophysical experiment, studying how much IR ink can be used while remaining invisible to users regardless of background color. We demonstrate that we can detect invisible IR content through our machine learning pipeline, and we developed an authoring tool that optimizes the amount of IR ink on the color regions of an input document for machine and human detectability. Finally, we demonstrate several applications, including augmenting paper documents and objects.
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