Driving assistance device and driving assistance method
First Claim
1. A computer system including a central processing unit, the computer system being configured to provide 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 determining that a current driving lane, on which the own vehicle travels, is the connection lane when a first condition, a second condition and a third condition are satisfied after the lane entry detection section has detected the entry of the own vehicle into the connection lane, wherethe first condition indicates that 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, the second condition indicates that 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 satisfies a predetermined speed reduction pattern, and the third condition indicates that a distance between the traffic signs detected by the traffic sign detection section in the forward direction of the own vehicle satisfies a predetermined distance.
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.
46 Citations
13 Claims
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1. A computer system including a central processing unit, the computer system being configured to provide 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 determining that a current driving lane, on which the own vehicle travels, is the connection lane when a first condition, a second condition and a third condition are satisfied after the lane entry detection section has detected the entry of the own vehicle into the connection lane, where the first condition indicates that 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, the second condition indicates that 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 satisfies a predetermined speed reduction pattern, and the third condition indicates that a distance between the traffic signs detected by the traffic sign detection section in the forward direction of the own vehicle satisfies a predetermined distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A computer implemented driving assistance method performed by a driving assistance device mounted on an own vehicle, comprising steps of:
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using a central processing unit (CPU), 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; using the CPU, detecting that the own vehicle enters a connection lane, through which the own vehicle leaves a highway; and using the CPU, detecting that a current driving lane, on which the own vehicle travels, is the connection lane as a ramp lane when a first condition, a second condition, and a third condition are satisfied after the entry of the own vehicle into the connection lane has been detected, where the first condition indicates that not less than two traffic signs arranged along the current driving lane in forward direction of the own vehicle are detected, the second condition indicates that an arrangement of speed limit symbols included in the detected traffic signs in the forward direction of the own vehicle satisfies a predetermined speed reduction pattern, and the third condition indicates that a distance between the detected traffic signs in the forward direction of the own vehicle satisfies a predetermined distance.
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Specification