Image-based indoor position determination
First Claim
Patent Images
1. A method comprising:
- extracting linear features from an image of an indoor portion of a building, said image captured by a camera at a mobile station;
determining a topological representation of said indoor portion based, at least in part, on positions or quantity of said linear features in said image; and
annotating said image with a rotation vector based, at least in part, on an inertial sensor or gravitometer, said rotation vector comprising information regarding an orientation of said image with respect to a direction of gravity;
comparing said topological representation to stored topological representations of said building to determine a candidate position of said mobile station; and
resolving said candidate position of said mobile station based, at least in part, on a signal strength or a travel time of a wireless signal received at said mobile station.
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Abstract
In one implementation, a method may comprise: determining a topological representation of an indoor portion of a building based, at least in part, on positions or number of lines in an image of the indoor portion of the building; and comparing the topological representation to one or more stored topological representations, for example in a digital map of the building, to determine a potential position of the indoor portion of the building.
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Citations
28 Claims
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1. A method comprising:
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extracting linear features from an image of an indoor portion of a building, said image captured by a camera at a mobile station; determining a topological representation of said indoor portion based, at least in part, on positions or quantity of said linear features in said image; and annotating said image with a rotation vector based, at least in part, on an inertial sensor or gravitometer, said rotation vector comprising information regarding an orientation of said image with respect to a direction of gravity; comparing said topological representation to stored topological representations of said building to determine a candidate position of said mobile station; and resolving said candidate position of said mobile station based, at least in part, on a signal strength or a travel time of a wireless signal received at said mobile station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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extracting linear features from an image of an indoor portion of a building, said image captured by a camera at a mobile station; determining a topological representation of said indoor portion based, at least in part, on positions or quantity of said linear features in said image; comparing said topological representation to stored topological representations of said building to determine multiple candidate positions of said mobile station, each of said multiple candidate positions corresponding to a candidate topological representation that matches said topological representation; and resolving said multiple candidate positions of said mobile station based, at least in part, on a signal strength or a travel time of a wireless signal received at said mobile station.
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10. An apparatus comprising:
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means for extracting linear features from an image of an indoor portion of a building, said image captured by a camera at a mobile station; means for determining a topological representation of said indoor portion based, at least in part, on positions or quantity of said linear features in said image; means for annotating said image with a rotation vector based, at least in part, on an inertial sensor or gravitometer, said rotation vector comprising information regarding an orientation of said image with respect to a direction of gravity; and means for comparing said topological representation to stored topological representations of said building to determine a candidate position of said mobile station; and resolving said candidate position of said mobile station based, at least in part, on a signal strength or a travel time of a wireless signal received at said mobile station. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An apparatus comprising:
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means for extracting linear features from an image of an indoor portion of a building, said image captured by a camera at a mobile station; means for determining a topological representation of said indoor portion based, at least in part, on positions or quantity of said linear features in said image; means for comparing said topological representation to stored topological representations of said building to determine multiple candidate positions of said mobile station, each of said multiple candidate positions corresponding to a candidate topological representation that matches said topological representation; and means for resolving said multiple candidate positions of said mobile station based, at least in part, on a signal strength or a travel time of a wireless signal received at said mobile station.
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19. An apparatus comprising:
one or more processing units configured to; extract linear features from an image of an indoor portion of a building, said image captured by a camera at a mobile station; determine a topological representation of said indoor portion based, at least in part, on positions or quantity of said linear features in said image; annotate said image with a rotation vector based, at least in part, on an inertial sensor or gravitometer, said rotation vector comprising information regarding an orientation of said image with respect to a direction of gravity; and compare said topological representation to stored topological representations of said building to determine a candidate position of said mobile station; and resolve said candidate position of said mobile station based, at least in part, on a signal strength or a travel time of a wireless signal received at said mobile station. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. An apparatus comprising:
one or more processing units configured to; extract linear features from an image of an indoor portion of a building, said image captured by a camera at a mobile station; determine a topological representation of said indoor portion based, at least in part, on positions or quantity of said linear features in said image; compare said topological representation to stored topological representations of said building to determine multiple candidate positions of said mobile station, each of said multiple candidate positions corresponding to a candidate topological representation that matches said topological representation; and resolve said multiple candidate positions of said mobile station based, at least in part, on a signal strength or a travel time of a wireless signal received at said mobile station.
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28. A non-transitory storage medium comprising machine-readable instructions stored thereon that are executable by a special purpose computing device to:
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extract linear features from an image of an indoor portion of a building, said image captured by a camera at a mobile station; determine a topological representation of said indoor portion based, at least in part, on positions or quantity of said linear features in said image; annotate said image with a rotation vector based, at least in part, on an inertial sensor or gravitometer, said rotation vector comprising information regarding an orientation of said image with respect to a direction of gravity; and compare said topological representation to stored topological representations of said building to determine a candidate position of said mobile station; and resolving said candidate position of said mobile station based, at least in part, on a signal strength or a travel time of a wireless signal received at said mobile station.
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Specification