Apparatus for detecting lane-marking on road
First Claim
1. A detection apparatus mounted on a vehicle adapted to detect a lane-marking on a road based on a road-surface image taken from a road surface in front of the vehicle, comprising:
- an acquiring unit for periodically acquiring the road-surface image and each acquired road-surface image being framed into a single frame;
an extracting unit for extracting an edge point from the frame framed by the acquiring unit;
a lane detecting unit for detecting the lane-marking based on the edge point extracted by the extracting unit, anda first determining unit for determining whether or not the number of edge points located on the lane-marking detected by the lane detecting unit is smaller than a predetermined threshold value,wherein the lane detecting unit is configured to detect the lane-marking based on a plurality of edge points combined from among the edge points extracted subsequently from the road-surface images in a plurality of frames subsequently framed by the acquiring unit, when the first determining unit determines that the number of edge points is smaller than the predetermined threshold value.
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Accused Products
Abstract
The image processing ECU periodically acquires road-surface images and extracts edge points in the acquired road-surface image. Subsequently, the ECU determines the operating mode and extracts the edge line when the operating mode is either a dotted mode or a frame-accumulation mode. The edge points are transformed e.g. Hough transform, to extract an edge line that most frequently passes through the edge points. The extracted edge line denotes the lane marking. The ECU outputs a signal to activate a buzzer alert when determining the vehicle may depart from the lane.
20 Citations
15 Claims
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1. A detection apparatus mounted on a vehicle adapted to detect a lane-marking on a road based on a road-surface image taken from a road surface in front of the vehicle, comprising:
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an acquiring unit for periodically acquiring the road-surface image and each acquired road-surface image being framed into a single frame; an extracting unit for extracting an edge point from the frame framed by the acquiring unit; a lane detecting unit for detecting the lane-marking based on the edge point extracted by the extracting unit, and a first determining unit for determining whether or not the number of edge points located on the lane-marking detected by the lane detecting unit is smaller than a predetermined threshold value, wherein the lane detecting unit is configured to detect the lane-marking based on a plurality of edge points combined from among the edge points extracted subsequently from the road-surface images in a plurality of frames subsequently framed by the acquiring unit, when the first determining unit determines that the number of edge points is smaller than the predetermined threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 9)
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7. A detection method performed on a vehicle for detecting a lane-marking on a road based on a road-surface image taken from a road surface in front of the vehicle, the detection method comprising steps of:
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periodically acquiring the road-surface image; framing the road-surface image into a single frame; extracting an edge point from the frame framed by the acquiring step; detecting the lane-marking by using a predetermined procedure based on the extracted edge point; and determining whether or not a number of edge points located on the detected lane-marking is smaller than a predetermined threshold value, wherein the lane-marking is detected based on a plurality of edge points combined from among the edge points extracted subsequently from the road-surface images in a plurality of frames subsequently framed by the acquiring step, when it is determined that the number of edge points is smaller than the predetermined threshold value. - View Dependent Claims (8)
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10. A detection apparatus mounted on a vehicle adapted to detect a lane-marking on a road based on one or more road-surface images taken from a road surface in front of the vehicle, comprising:
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an acquiring unit for periodically acquiring each of the road-surface images and each acquired road-surface image being framed into a single frame; an extracting unit for extracting at least one current edge point from each of the frames framed by the acquiring unit; a lane detecting unit for detecting the lane-marking based on the current edge points extracted by the extracting unit; and a first determining unit for determining whether or not the number of current edge points located on the lane-marking detected by the lane detecting unit is smaller than a predetermined threshold value;
whereinthe lane detecting unit is configured to detect the lane-marking based on only the current edge points extracted from the road-surface images combined with only one or more new edge points extracted by the extracting unit from a plurality of frames subsequently framed by the acquiring unit, when the first determining unit determines that the number of current edge points is smaller than the predetermined threshold value; and the road surface images in the plurality of frames are not combined. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification