Boundary line recognition apparatus and branch road determination apparatus
First Claim
1. A boundary line recognition apparatus comprising:
- a camera that is installed in a vehicle to capture an image of a travel road;
a boundary line candidate extraction section that extracts candidate edge points of a boundary line sectioning the travel road, on the basis of a luminance of an image captured by the camera, and extracts a candidate line of the boundary line from a series of the extracted candidate edge points;
a width calculation section that calculates, in the candidate line of the boundary line extracted by the boundary line candidate extraction section, an apparent thickness of the candidate line on the image, which is an apparent perpendicular distance from one side edge of the candidate line to the other side edge of the candidate line, from a width of the candidate line in a horizontal direction of the image and an angle of the candidate line relative to a vertical direction of the image;
a boundary line characteristics calculation unit that calculates a probability of the candidate line as being the boundary line to be higher, as the candidate line has a large degree of having characteristics as a boundary line; and
a boundary line recognition unit that integrates the probabilities calculated by the boundary line characteristics calculation section, in respect of a plurality of the characteristics to recognize the boundary line,wherein the plurality of the characteristics of the boundary line include that a ratio of the apparent thickness calculated by the width calculation section, to a blur degree of the image is larger than a predetermined value, andwherein the boundary line characteristics calculation unit calculates the probability to be lower, as the ratio of the apparent thickness to the blur degree of the image is smaller.
2 Assignments
0 Petitions
Accused Products
Abstract
In a boundary line recognition apparatus, based on luminance levels of an image captured by a camera, candidate edge points of a boundary line sectioning a travel road are extracted, and a candidate line of the boundary line is extracted. An apparent width of the candidate line on an image is calculated, from a width of the candidate line in a horizontal direction of the image and an angle of the candidate line relative to a vertical direction of the image. A probability of a candidate line being a boundary line is calculated to be higher, as a degree of the candidate line having characteristics as a boundary line is higher. The calculated probabilities are integrated in respect of a plurality of characteristics to recognize a boundary line. The characteristics include a ratio of the calculated apparent width to an image blur degree is larger than a predetermined value.
7 Citations
10 Claims
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1. A boundary line recognition apparatus comprising:
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a camera that is installed in a vehicle to capture an image of a travel road; a boundary line candidate extraction section that extracts candidate edge points of a boundary line sectioning the travel road, on the basis of a luminance of an image captured by the camera, and extracts a candidate line of the boundary line from a series of the extracted candidate edge points; a width calculation section that calculates, in the candidate line of the boundary line extracted by the boundary line candidate extraction section, an apparent thickness of the candidate line on the image, which is an apparent perpendicular distance from one side edge of the candidate line to the other side edge of the candidate line, from a width of the candidate line in a horizontal direction of the image and an angle of the candidate line relative to a vertical direction of the image; a boundary line characteristics calculation unit that calculates a probability of the candidate line as being the boundary line to be higher, as the candidate line has a large degree of having characteristics as a boundary line; and a boundary line recognition unit that integrates the probabilities calculated by the boundary line characteristics calculation section, in respect of a plurality of the characteristics to recognize the boundary line, wherein the plurality of the characteristics of the boundary line include that a ratio of the apparent thickness calculated by the width calculation section, to a blur degree of the image is larger than a predetermined value, and wherein the boundary line characteristics calculation unit calculates the probability to be lower, as the ratio of the apparent thickness to the blur degree of the image is smaller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification