Method for generating accurate lane level maps
First Claim
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1. A method for determining road lane characteristics of a road, the method comprising:
- obtaining Lidar data of road markers on the road, and extracting road lane marker data from the Lidar data;
accessing road map data;
determining road segment node locations from the road map data, wherein the nodes are evenly spaced at an interval defined by δ
o/2;
searching for line segments lateral to the nodes, wherein the searching is performed over a rectangle defined by vectors of a length δ
o/2;
tying the Lidar generated road marker data to respective road segment node locations;
applying particle filtering, using a dual particle filter, to the road lane marker data and road segment node locations to estimate road lane characteristics including at least one of a bicycle lane, a road exit, and a road entrance adjacent to the road; and
generating a road lane map including the road lane characteristics.
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Abstract
A method for generating accurate lane level maps based on course map information and Lidar data captured during the pass of a sensor carrying vehicle along a road. The method generates accurate lane estimates including the center of each lane, the number of lanes, and the presence of any bicycle paths and entrance and exit ramps using a computer-implemented method where the course map data and the Lidar data are subjected to particle filtering.
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Citations
11 Claims
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1. A method for determining road lane characteristics of a road, the method comprising:
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obtaining Lidar data of road markers on the road, and extracting road lane marker data from the Lidar data; accessing road map data; determining road segment node locations from the road map data, wherein the nodes are evenly spaced at an interval defined by δ
o/2;searching for line segments lateral to the nodes, wherein the searching is performed over a rectangle defined by vectors of a length δ
o/2;tying the Lidar generated road marker data to respective road segment node locations; applying particle filtering, using a dual particle filter, to the road lane marker data and road segment node locations to estimate road lane characteristics including at least one of a bicycle lane, a road exit, and a road entrance adjacent to the road; and generating a road lane map including the road lane characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of generating a road lane map, the method comprising:
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extracting road lane marker data from Lidar data obtained by a vehicle moving along one lane of a road; tying the extracted road marker data to respective road segment node locations obtained from prior road map data, wherein the nodes are evenly spaced at an interval defined by δ
o, and a search for line markers lateral to the nodes is performed over a rectangle defined by vectors of a length δ
o/2;using both a regular particle filter and a dual particle filter applied to the road lane marker data or the road segment node locations to detect lane characteristics including at least one of;
(1) a transition of one lane of a road into at least two side-by-side road lanes, and (2) a transition of two side-by-side road lanes into one road lane; andgenerating a road lane map depicting the detected lane characteristics. - View Dependent Claims (9, 10, 11)
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Specification