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1. 发明授权

US06740875B1 Gamma watermarking 失效
标题翻译：伽玛水印
公开(公告)号：US06740875B1
公开(公告)日：2004-05-25
申请号：US09502859
申请日：2000-02-11
申请人： Muriel Y. Ishikawa , Lowell L. Wood , Ronald W. Lougheed , Kenton J. Moody , Tzu-Fang Wang
发明人： Muriel Y. Ishikawa , Lowell L. Wood , Ronald W. Lougheed , Kenton J. Moody , Tzu-Fang Wang
IPC分类号： G01T1161
CPC分类号： B41M3/14
摘要： A covert, gamma-ray “signature” is used as a “watermark” for property identification. This new watermarking technology is based on a unique steganographic or “hidden writing” digital signature, implemented in tiny quantities of gamma-ray-emitting radioisotopic material combinations, generally covertly emplaced on or within an object. This digital signature may be readily recovered at distant future times, by placing a sensitive, high energy-resolution gamma-ray detecting instrument reasonably precisely over the location of the watermark, which location may be known only to the object's owner; however, the signature is concealed from all ordinary detection means because its exceedingly low level of activity is obscured by the natural radiation background (including the gamma radiation naturally emanating from the object itself, from cosmic radiation and material surroundings, from human bodies, etc.). The “watermark” is used in object-tagging for establishing object identity, history or ownership. It thus may serve as an aid to law enforcement officials in identifying stolen property and prosecuting theft thereof. Highly effective, potentially very low cost identification-on demand of items of most all types is thus made possible.
摘要翻译：隐蔽的伽马射线“签名”被用作属性识别的“水印”。这种新的水印技术基于独特的隐写或“隐藏书写”数字签名，其实施在少量的伽马射线发射放射性同位素材料组合中，通常隐蔽地放置在物体上或物体内。通过将敏感的高能量分辨率γ射线检测仪器合理地精确地放置在水印的位置上，该位置可能仅对物体的所有者可知，该数字签名可以在远距离的未来时间容易地恢复; 然而，由于其极低的活动水平被自然辐射背景遮蔽（包括自然辐射的物体本身，宇宙辐射和物质环境，人体等）的伽马辐射，所有这些标志都被隐藏起来。）。 “水印”用于建立对象标识，历史或所有权的对象标签。因此，这可能有助于执法人员查明被盗财产和起诉盗窃。因此，大多数所有类型的物品的高效，可能非常低成本的识别都是可能的。

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