Lane mark recognition system and vehicle traveling control system using the same
First Claim
1. A lane mark recognition apparatus comprising:
- an image capturing mechanism configured to capture an image of a road having a lane mark portion, the lane mark portion of the captured image of the road having a picture property associated therewith; and
lane mark recognition means configured to detect the lane mark portion within the image of the road by performing a string model analysis of the image, said string model analysis including automatically moving a string construct within the image to converge on the lane mark portion of the image;
wherein said string construct is modeled as a series of node-type string elements spaced within the image and a plurality of string segments interconnecting respective adjacent pairs of said node-type string elements, each of said node-type string elements being movable within the image and each of said string segments being modeled as an elastic element resiliently biasing relative movement between said respective adjacent pairs of said node-type string elements; and
wherein said lane mark recognition means is configured to assign relative attractive forces between said node-type string elements and the lane mark portion of the image based on a measure of the picture property of the image, said lane mark recognition means being further configured such that the node-type string elements of said string construct are converged toward the lane mark portion of the image as a function of said relative attractive forces.
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Accused Products
Abstract
A lane mark recognition apparatus for a vehicle is provided which recognizes a lane mark printed on a road using an image of a frontal view captured by a CCD camera. The apparatus identifies a location in the image on which a string model construct converges as a location of the lane mark. The string model utilizes a string construct that is made up of a plurality of node-type string components and lines connecting adjacent string components. The string components are movable within the image by an attractive force produced based on a measure of a picture property of the lane mark. Each of the connecting lines is modeled as an elastic member, which produces a reactive force against deformation of the string model so as to maintain geometry of the whole of the string model.
54 Citations
12 Claims
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1. A lane mark recognition apparatus comprising:
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an image capturing mechanism configured to capture an image of a road having a lane mark portion, the lane mark portion of the captured image of the road having a picture property associated therewith; and
lane mark recognition means configured to detect the lane mark portion within the image of the road by performing a string model analysis of the image, said string model analysis including automatically moving a string construct within the image to converge on the lane mark portion of the image;
wherein said string construct is modeled as a series of node-type string elements spaced within the image and a plurality of string segments interconnecting respective adjacent pairs of said node-type string elements, each of said node-type string elements being movable within the image and each of said string segments being modeled as an elastic element resiliently biasing relative movement between said respective adjacent pairs of said node-type string elements; and
wherein said lane mark recognition means is configured to assign relative attractive forces between said node-type string elements and the lane mark portion of the image based on a measure of the picture property of the image, said lane mark recognition means being further configured such that the node-type string elements of said string construct are converged toward the lane mark portion of the image as a function of said relative attractive forces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A storage medium storing therein a program which is readable by a computer, said computer comprising a part of a lane mark recognition means in a lane mark recognition apparatus for a vehicle, said lane mark recognition apparatus being configured to capture an image of a road ahead of a controlled vehicle equipped with the lane mark recognition apparatus and to recognize a lane mark printed on the road via execution of the lane mark recognition program, said lane mark recognition means executing the program to identify the location of the lane mark in the image as being a location to which a string construct converges, the string construct being comprised of a plurality of node-type string elements and string segments connecting adjacent pairs of said string elements, said construct being moved in the image by an attractive force produced based on a measure of a picture property of the lane mark portion of the image, each of the string segments being modeled as an elastic member which produces a reactive force against deformation of the string construct so as to maintain geometry of the whole of the string construct.
Specification