| 摘要 |
Digital watermarking technology is used in conjunction with map data, such as is acquired by satellite and other aerial sensors, and as may be generated from databases based on such aerial data. For example, an image including steganographically hidden location data is analyzed and a refinement to the location data is made. The refined location data is then steganographically hidden in the image. In one implementation a method of steganographically embedding auxiliary data in imagery is provided. The method includes receiving imagery including a first geolocation estimate steganographically embedded therein. The first geolocation estimate corresponds to at least one area depicted in the imagery. The method further includes determining a second geolocation estimate, the second geolocation estimate comprising a more precise geolocation estimate, relative to the first geolocation estimate, for the at least one area depicted in the imagery, and steganographically embedding the second geolocation estimate in the imagery.
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