发明名称 |
Digital watermarking maps and signs, and related navigational tools |
摘要 |
Maps and/or signs are embedded with plural-bit data in the form of digital watermarks. In one implementation, an apparatus is provided to read two or more digital watermarks embedded within a map. Each of the two or more digital watermarks includes location information for a respective map location. The two or more digital watermarks are embedded through alterations to data representing the map; the alterations are generally imperceptible to a human observer of the map. The apparatus includes: a global positioning system receiver to determine a physical location of said apparatus; an input to receive data corresponding to at least a portion of the respective map area; a processor or electronic processing circuitry to extract the location information from the input data and to correlate the physical location with the extracted location information; and an output to output an indication of a relative correlation between the physical location and watermark location information. Other implementations are provided and claimed as well.
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申请公布号 |
US7506169(B2) |
申请公布日期 |
2009.03.17 |
申请号 |
US20070781677 |
申请日期 |
2007.07.23 |
申请人 |
DIGIMARC CORPORATION |
发明人 |
BRUNDAGE TRENT J.;LOFGREN NEIL E. |
分类号 |
H04L9/00;G06F21/00;G06T1/00;G09B29/10;H04L15/34 |
主分类号 |
H04L9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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