Method for recognizing traffic signs
First Claim
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1. A method of traffic sign recognition in a driver assistance system of a motor vehicle, said method comprising the step:
- a) using a camera, recording image data of at least one image of a vehicle environment outside of the motor vehicle driving along a road;
and further comprising the following steps in an automatic machine interpretation process performed by said driver assistance system;
b) from the image data, recognizing the presence and class of at least one main sign present in the vehicle environment;
c) from the image data, recognizing the presence of at least one additional sign assigned to the main sign;
d) classifying the additional sign using a pattern recognition method to an extent possible;
e) reading and interpreting and thereby recognizing text of the additional sign using a text recognition method; and
f) in a relevance assessment unit of the driver assistance system, automatically assessing a relevance of the main sign in an automatic machine-based relevance assessment, in which the recognized text of the additional sign is compared to situational information regarding the motor vehicle, a current operation of the motor vehicle, or a condition of the vehicle environment.
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Abstract
For recognizing traffic signs that include a main sign and an associated additional sign, a method involves using a camera to record image data of an environment outside a vehicle, evaluating the image data to detect the presence and the class of the main sign and to detect the presence and partially classify the content of the additional sign by pattern recognition, performing text recognition to read and interpret text of the additional sign, and comparing the recognized text with actual current situational information to determine whether the main sign is currently applicable.
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Citations
19 Claims
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1. A method of traffic sign recognition in a driver assistance system of a motor vehicle, said method comprising the step:
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a) using a camera, recording image data of at least one image of a vehicle environment outside of the motor vehicle driving along a road; and further comprising the following steps in an automatic machine interpretation process performed by said driver assistance system; b) from the image data, recognizing the presence and class of at least one main sign present in the vehicle environment; c) from the image data, recognizing the presence of at least one additional sign assigned to the main sign; d) classifying the additional sign using a pattern recognition method to an extent possible; e) reading and interpreting and thereby recognizing text of the additional sign using a text recognition method; and f) in a relevance assessment unit of the driver assistance system, automatically assessing a relevance of the main sign in an automatic machine-based relevance assessment, in which the recognized text of the additional sign is compared to situational information regarding the motor vehicle, a current operation of the motor vehicle, or a condition of the vehicle environment. - View Dependent Claims (2, 3, 4, 5)
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6. A method of traffic sign recognition in a driver assistance system of a motor vehicle, said method comprising the step:
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a) using a camera, recording image data of at least one image of a vehicle environment outside of the motor vehicle driving along a road; and further comprising the following steps in an automatic machine interpretation process performed by said driver assistance system; b) from the image data, recognizing the presence and class of at least one main sign present in the vehicle environment; c) from the image data, recognizing the presence of at least one additional sign assigned to the main sign, wherein the additional sign includes text; d) reading and interpreting and thereby recognizing the text of the additional sign using a text recognition method; e) deciding whether the additional sign includes other information, and if so, then classifying the other information using a pattern recognition method; and f) in a relevance assessment unit of the driver assistance system, automatically assessing a relevance of the main sign in an automatic machine-based relevance assessment, in which the recognized text of the additional sign is compared to situational information regarding the motor vehicle, a current operation of the motor vehicle, or a condition of the vehicle environment. - View Dependent Claims (7, 8, 9, 10)
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11. A method of traffic sign recognition in a driver assistance system of a motor vehicle driving along a road, wherein the driver assistance system includes a camera, said method comprising the following steps performed in the driver assistance system:
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a) with the camera, recording image data of at least one image of a vehicle environment outside of the vehicle that includes a main sign and an auxiliary sign associated with the main sign; b) evaluating the image data and thereby recognizing a presence of the main sign and classifying main sign information of the main sign; c) evaluating the image data and thereby recognizing a presence of the auxiliary sign; d) performing pattern recognition on the image data and thereby recognizing and classifying any available pattern information of the auxiliary sign; e) performing text recognition on the image data and thereby reading and interpreting textual information of the auxiliary sign; f) obtaining situational information regarding the motor vehicle, a current operation of the motor vehicle, or a condition of the vehicle environment; g) automatically assessing a relevance of the main sign by comparing the situational information with the interpreted textual information of the auxiliary sign and with any available classified pattern information of the auxiliary sign, and thereby determining whether that the main sign is relevant only when the situational information falls within a scope of the interpreted textual information of the auxiliary sign and the available classified pattern information of the auxiliary sign; and h) in response to the step g) having determined that the main sign is relevant, activating a driver assistance feature of the driver assistance system based on the classified main sign information of the main sign. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification