Hiding geo-location data through arrangement of objects
First Claim
Patent Images
1. A method of marking a physical structure comprising the steps of:
- providing a steganographic signal;
identifying a set of spatial position points corresponding to the steganographic signal; and
arranging message objects on a surface of the physical structure to be viewable from an aerial platform, wherein the arrangement is in accordance with the spatial position points.
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Abstract
The present invention provides steganographic-embedding techniques. In one implementation a digital watermark signal is mapped to a set of spatial positions. Physical message objects are positioned according to the set of spatial positions. The signal is provided on a physical structure such as a building or road. The signal may include geo-location information. The geo-location information identifies the location of the physical structure. In other cases the signal includes a marker or identifier. The marker or identifier provides a reference point for images depicting the physical structure.
158 Citations
18 Claims
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1. A method of marking a physical structure comprising the steps of:
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providing a steganographic signal;
identifying a set of spatial position points corresponding to the steganographic signal; and
arranging message objects on a surface of the physical structure to be viewable from an aerial platform, wherein the arrangement is in accordance with the spatial position points. - View Dependent Claims (2, 3, 4, 5, 6, 18)
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- 7. A method of providing a geo-location reference for a physical structure comprising the steps of steganographically providing machine-readable code on a top surface of the physical structure that is detectable from an aerial platform, wherein placement of the machine-readable code on the top surface of the physical structure does not betray the existence of the code to human observers of the top surface of the physical structure, but the code is detectable from image data corresponding to the top surface of the physical structure, wherein the machine readable code comprises a geo-location reference.
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12. A method to determine geo-locations depicted in an image captured from an aerial platform, said method comprising the steps of:
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analyzing the image to detect a signal steganographically hidden on an outer surface of a first physical structure that is depicted in the image, wherein the signal comprises a message including a geo-location indicator; and
based on the geo-location indicator determining a geo-location for the first physical structure. - View Dependent Claims (13, 14)
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15. A method of determining a geo-location of a ground area or physical structure from an aerial platform comprising the steps of:
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capturing an image of the ground area or physical structure, wherein the ground area or physical structure comprises a signal steganographically provided on an surface of the physical structure so as to be capable of being captured in an image taken from the aerial platform, and wherein the signal comprises a geo-location indicator;
decoding the signal to obtain the geo-location indicator; and
based on the geo-location indicator determining a location for the ground area or physical structure. - View Dependent Claims (16, 17)
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Specification