DRIVING ASSISTANCE DEVICE AND DRIVING ASSISTANCE METHOD
First Claim
1. A driving assistance device comprising:
- a traffic sign detection section capable of detecting traffic signs including at least a speed limit symbol on a basis of front image data captured by an in-vehicle camera mounted on an own vehicle,a lane entry detection section capable of detecting that the own vehicle is entering a connection lane through which the own vehicle leaves a highway; and
a judgment section capable of detecting that a current driving lane, on which the own vehicle travels, is the connection lane when following first and second conditions and are satisfied after the lane entry detection section detects the entry of the own vehicle into the connection lane;
(first condition) the traffic sign detection section detects not less than two traffic signs arranged along the current driving lane in a forward direction of the own vehicle, and(second condition) a speed reduction pattern indicated by speed limit symbols included in the traffic signs detected by the traffic sign detection section in the forward direction of the own vehicle satisfy a predetermined speed reduction pattern.
1 Assignment
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Accused Products
Abstract
An ECU as a driving assistance device has a traffic sign detection section, a lane entry detection section and a judgment section. The traffic sign detection section detects traffic signs including a speed limit symbol based on front-image data captured by an in-vehicle camera. The lane entry detection section detects that the own vehicle has entered a ramp lane to leave a highway. The judgment section detects an extent of a current driving lane as the ramp lane when following conditions (c1) and (c2) are satisfied after the lane entry detection section detects the entry of the own vehicle into the ramp lane: (c1) not less than two traffic signs are arranged along the current driving lane in forward direction of the vehicle; and (c2) an arrangement of speed limit symbols included in the detected traffic signs satisfy a predetermined speed reduction pattern.
53 Citations
13 Claims
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1. A driving assistance device comprising:
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a traffic sign detection section capable of detecting traffic signs including at least a speed limit symbol on a basis of front image data captured by an in-vehicle camera mounted on an own vehicle, a lane entry detection section capable of detecting that the own vehicle is entering a connection lane through which the own vehicle leaves a highway; and a judgment section capable of detecting that a current driving lane, on which the own vehicle travels, is the connection lane when following first and second conditions and are satisfied after the lane entry detection section detects the entry of the own vehicle into the connection lane; (first condition) the traffic sign detection section detects not less than two traffic signs arranged along the current driving lane in a forward direction of the own vehicle, and (second condition) a speed reduction pattern indicated by speed limit symbols included in the traffic signs detected by the traffic sign detection section in the forward direction of the own vehicle satisfy a predetermined speed reduction pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A driving assistance method performed by a driving assistance device mounted on an own vehicle, comprising steps of:
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detecting traffic signs including a speed limit symbol on a basis of front image data captured by an in-vehicle camera mounted on an own vehicle; detecting that the own vehicle enters a connection lane, through which the own vehicle leaves a highway; and detecting that a current driving lane, on which the own vehicle travels, is the connection lane as a ramp lane when following first and second conditions and are satisfied after the lane entry detection section detects the entry of the own vehicle into the connection lane; (first condition) not less than two traffic signs arranged along the current driving lane in forward direction of the own vehicle are detected; and (second condition) an arrangement of speed limit symbols included in the detected traffic signs in the forward direction of the own vehicle satisfy a predetermined speed reduction pattern.
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Specification