Multi-modal speed limit assistant
First Claim
1. A method of estimating a speed limit of a speed limit sign, the method comprising:
- receiving, by a processor, at least one first tuple from a system having a camera configured to capture an image of a speed limit sign and process the image to generate the first tuples, wherein each first tuple includes an estimated speed limit of the sign and a probability that the estimated speed limit is correct;
receiving, by a processor, at least one second tuple from a global positioning system (GPS), wherein each second tuple includes a speed limit associated with a coordinate and a probability that the speed limit is correct; and
estimating, by a processor, a final speed limit of the image of the speed limit sign by tuples performing a Bayesian fusion on the probabilities of the first and second tuples having the same speed limit,wherein the image is captured when a vehicle is in a first street segment and the fusion is delayed until the vehicle enters a second adjacent segment from which the coordinate is acquired.
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Abstract
A speed limit assistant (SLA) system includes a camera based SLA, a map based SLA, and a fusion unit. The camera based SLA is configured to determine a first set of probabilities for an input image, wherein the probabilities indicate how likely the image includes a discrete set of speed limit signs. The map based SLA is configured to determine a second set of probabilities for an input coordinate, wherein the probabilities indicate how likely the coordinate is to correspond to one of a discrete set of speed limits. The fusion unit is configured to perform a Bayesian fusion on the first and second set of probabilities to determine a final speed limit from the discrete set of speed limits.
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Citations
14 Claims
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1. A method of estimating a speed limit of a speed limit sign, the method comprising:
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receiving, by a processor, at least one first tuple from a system having a camera configured to capture an image of a speed limit sign and process the image to generate the first tuples, wherein each first tuple includes an estimated speed limit of the sign and a probability that the estimated speed limit is correct; receiving, by a processor, at least one second tuple from a global positioning system (GPS), wherein each second tuple includes a speed limit associated with a coordinate and a probability that the speed limit is correct; and estimating, by a processor, a final speed limit of the image of the speed limit sign by tuples performing a Bayesian fusion on the probabilities of the first and second tuples having the same speed limit, wherein the image is captured when a vehicle is in a first street segment and the fusion is delayed until the vehicle enters a second adjacent segment from which the coordinate is acquired. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of estimating a speed limit of a speed limit sign, the method comprising:
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determining, by a processor, a type of a street that corresponds to a coordinate from a global positioning system (GPS); determining, by a processor, at least one speed limit that corresponds to the determined street type; determining, by a processor, first probabilities for each tuple comprising the determined street type and a corresponding one of the speed limits; receiving second probabilities from a system having a camera configured to capture an image of the speed limit sign and process the image to generate the second probabilities, wherein each second probability is mapped to a corresponding one of the speed limits; and estimating, by a processor, a final speed limit of the image of the speed limit sign by combining the first and second probabilities for each same speed limit, wherein the image is captured when a vehicle is in a first street segment and the estimating is delayed until the vehicle enters a second adjacent segment from which the coordinate is acquired. - View Dependent Claims (8, 9, 10, 11)
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12. A non-transitory computer readable medium, tangibly embodying a program of instructions executable by a processor to perform method steps for determining a speed limit of a speed limit sign, the method steps comprising:
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determining a recommended speed limit for a first coordinate of a global positioning system (GPS); determining first probabilities for speed limits at and below the recommended speed limit, herein each first probability indicates a likelihood that the corresponding speed limit is correct for the first coordinate; receiving second probabilities from a system including a camera that captures an image of the speed limit sign and processes the image to determine the second probabilities, wherein each second probability indicates a likelihood that each of the speed limits corresponds to the speed limit sign; and estimating a speed limit of the speed limit sign by combining the first and second probabilities for each same speed limit, wherein the image is captured when a vehicle is in a first street segment and the first coordinate is determined by projecting a second coordinate from the GPS along the first street segment to a point along a second street segment adjacent the first. - View Dependent Claims (13, 14)
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Specification