Sign display apparatus
First Claim
Patent Images
1. A sign display apparatus comprising:
- an image capturing unit mounted on a vehicle configured to capture an image and acquire a captured image signal representing the captured image while the vehicle is being driven;
a sign detector configured to detect a sign on a peripheral edge of a road from an image area represented by the captured image signal acquired by the image capturing unit;
an information output section configured to output sign information with respect to a type of the sign that is detected by the sign detector;
a traveled distance measurer configured to measure a traveled distance over which the vehicle has traveled, in response to detection of the sign;
an output instructor configured to instruct the information output section to stop output of the sign information if the traveled distance measured by the traveled distance measurer exceeds a threshold value;
a table configured to store a plurality of values related to intervals between the signs; and
a threshold value changer configured to change the threshold value based on an average of the stored values,wherein the table stores as the stored values the intervals between the signs indicative of a same speed limit based on the traveled distance measured by the traveled distance measurer.
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Abstract
A sign information output apparatus includes an output instructor for instructing an information output section to stop output of sign information if a traveled distance measured in response to the detection of a sign exceeds a threshold value, and a threshold value changer for changing a threshold value depending on at least one of interval information with respect to an interval at which signs of one type are placed, speed limit information with respect to a speed limit of the road, and a speed of the vehicle.
12 Citations
20 Claims
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1. A sign display apparatus comprising:
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an image capturing unit mounted on a vehicle configured to capture an image and acquire a captured image signal representing the captured image while the vehicle is being driven; a sign detector configured to detect a sign on a peripheral edge of a road from an image area represented by the captured image signal acquired by the image capturing unit; an information output section configured to output sign information with respect to a type of the sign that is detected by the sign detector; a traveled distance measurer configured to measure a traveled distance over which the vehicle has traveled, in response to detection of the sign; an output instructor configured to instruct the information output section to stop output of the sign information if the traveled distance measured by the traveled distance measurer exceeds a threshold value; a table configured to store a plurality of values related to intervals between the signs; and a threshold value changer configured to change the threshold value based on an average of the stored values, wherein the table stores as the stored values the intervals between the signs indicative of a same speed limit based on the traveled distance measured by the traveled distance measurer. - View Dependent Claims (2, 3, 4, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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5. A sign display apparatus comprising:
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an image capturing unit mounted on a vehicle configured to capture an image and acquire a captured image signal representing the captured image while the vehicle is being driven; a sign detector configured to detect a sign from an image area represented by the captured image signal acquired by the image capturing unit; an information output section configured to output sign information with respect to a type of the sign that is detected by the sign detector; a measured amount acquirer configured to acquire a yaw rate or a time-dependent change of a steering angle of the vehicle as a measured amount that is correlated to a steering amount for moving the vehicle in transverse directions thereof; a starting time determiner configured to determine a starting time of a judgment process based on the measured amount acquired by the measured amount acquirer; and an output instructor configured to instruct the information output section to stop output of the sign information if the time-dependent change of the measured amount from the starting time determined by the starting time determiner is judged to satisfy an output stop condition, wherein the output instructor instructs the information output section to stop output of the sign information if the absolute value of a time integral of the measured amount, except for a time period in which the vehicle is stopping, satisfies the output stop condition, wherein the output instructor judges that the time-dependent change of the measured amount satisfies the output stop condition, if an absolute value of a time integral of the measured amount exceeds a first threshold value, and wherein the time dependent change of opposite steering direction are cancelled out in the absolute value of a time integral of the measured amount. - View Dependent Claims (6, 7, 8, 20)
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Specification