Application of the hough transform to modeling the horizontal component of road geometry and computing heading and curvature
First Claim
1. A method of representing the horizontal component of roads in a geographic database comprising:
- providing data indicating a plurality of locations along a road;
using the data as an input to a Hough Transform to determine circular arcs and straight line segments that coincide with the road; and
storing data that define said arcs and line segments to represent the horizontal component of the road in the geographic database.
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Accused Products
Abstract
The Hough Transform is used to identify the circular arcs and straight line segments that coincide with the horizontal curves of roads. The Hough Transform uses data indicating positions along the roads as an input in order to identify the circular arcs and straight line segments that coincide with the roads. Data indicating the circular arcs and straight line segments are stored in a geographic database and are used to represent the roads. Radius of curvature of the road is obtained as a by product of this representation. Because the Hough Transform yields a closed form representation of road segments, the heading at any point along a road can be computed by computing the tangent to the closed form representation. Thus, heading can be accurately obtained at any point along a road.
79 Citations
14 Claims
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1. A method of representing the horizontal component of roads in a geographic database comprising:
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providing data indicating a plurality of locations along a road;
using the data as an input to a Hough Transform to determine circular arcs and straight line segments that coincide with the road; and
storing data that define said arcs and line segments to represent the horizontal component of the road in the geographic database. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
determining a value of the curvature at locations along the road using the data that define said circular arcs and straight line segments.
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13. The method of claim 1 further comprising:
determining a value of the heading at locations along the road using the data that define said circular arcs and straight line segments.
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14. A geographic database formed according to the process of claim 1.
Specification