White line detection apparatus and white line detection method
First Claim
1. A white line detection apparatus comprising:
- an extraction device that extracts an image of a white line detection processing area set within a road image captured by an image-capturing device;
a maximum value estimating device that estimates a maximum value among pixel values constituting the image of a road surface over the area other than a white line based upon pixel values corresponding to the image extracted by the extraction device;
a contrast reducing device that reduces the contrast of an image corresponding to pixel values equal to or smaller than the maximum value among pixel values constituting the image of the road surface over the area other than the white line, which has been estimated by the maximum value estimating device; and
a detection device that detects the white line based upon the image whose contrast has been lowered by the contrast reducing device.
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Abstract
A white line detection apparatus comprises an extraction device that extracts an image of a white line detection processing area set within a road image captured by an image-capturing device, a maximum value estimating device that estimates a maximum value among pixel values constituting an image of road surface areas other than the white line based upon the pixel values representing the image extracted by the extraction device, a contrast reducing device that reduces the contrast of an image corresponding to pixel values equal to or lower than the maximum value among the pixel values constituting the image of road surface areas other than the white line which has been estimated and a detection device that detects the white line based upon the image whose contrast has been lowered by the contrast reducing device.
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Citations
8 Claims
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1. A white line detection apparatus comprising:
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an extraction device that extracts an image of a white line detection processing area set within a road image captured by an image-capturing device;
a maximum value estimating device that estimates a maximum value among pixel values constituting the image of a road surface over the area other than a white line based upon pixel values corresponding to the image extracted by the extraction device;
a contrast reducing device that reduces the contrast of an image corresponding to pixel values equal to or smaller than the maximum value among pixel values constituting the image of the road surface over the area other than the white line, which has been estimated by the maximum value estimating device; and
a detection device that detects the white line based upon the image whose contrast has been lowered by the contrast reducing device. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A white line detection apparatus, comprising:
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an extraction means for extracting an image of a white line detection processing area set within a road image captured by an image-capturing device;
a maximum value estimation means for estimating a maximum value among pixel values constituting an image of a road surface over the area other than a white line based upon the pixel values corresponding to the image extracted by the extraction means;
a contrast reduction means for reducing the contrast of an image corresponding to pixel values equal to or smaller than the maximum value among pixel values constituting the image of the road surface over the area other than the white line which has been estimated by the maximum value estimation means; and
a detection means for detecting the white line based upon the image whose contrast has been lowered by the contrast reduction means.
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8. A white line detection method, comprising:
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extracting an image of a white line detection processing area set within a road image captured by an image-capturing device;
estimating a maximum value among pixel values constituting an image of a road surface over the area other than a white line based upon pixel values corresponding to the extracted image;
reducing the contrast of an image corresponding to pixel values equal to or lower than the maximum value among pixel values constituting the image of the road surface over the area other than the white line which has been estimated; and
detecting the white line based upon the image whose contrast has been reduced.
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Specification