Traffic sign classification system
AssigneeHarman Becker Automotive Systems GmbH
InventorsKoba Natroshvili, Ayyappan Mani
Life of this patent
Estimating the term…
Abstract
A method and device are described which are configured to establish whether a traffic sign has at least one graphical feature extending linearly thereon. A portion of image data which represents at least a portion of the traffic sign is identified. Coefficients of a two-dimensional spectral representation of the portion of the image data are calculated. The coefficients of the two-dimensional spectral representation are determined for Fourier space coordinates disposed along a line in Fourier space. Based on the determined coefficients it is established whether the traffic sign has the at least one graphical feature extending linearly on the traffic sign.
Claims45
A method of classifying a traffic sign having at least one graphical feature extending linearly thereon, the method comprising the steps of:
- providing a device for capturing image data representing at least a portion of the traffic sign;
- identifying the portion of image data;
- calculating coefficients of a two-dimensional spectral representation of the portion of image data;
- determining the coefficients of the two-dimensional spectral representation for Fourier space coordinates disposed along a line in Fourier space, the line having a selected direction in Fourier space;
- and
- establishing, based on the determined coefficients, whether the traffic sign has at least one graphical feature extending linearly on the traffic sign.
A computer program product having stored thereon instructions which, when executed by a processor of an electronic device, direct the electronic device to
- identify a portion of image data representing at least a portion of a traffic sign;
- calculate coefficients of a two-dimensional spectral representation of the portion of image data;
- determine the coefficients of the two-dimensional spectral representation for Fourier space coordinates disposed along a line in Fourier space;
- and
- establish, based on the determined coefficients, whether the traffic sign has at least one graphical feature extending linearly on the traffic sign.
The computer program product of claim 20, where the two-dimensional transform is a transform selected from the group consisting of a two-dimensional discrete cosine transform, a two-dimensional discrete sine transform, or a two-dimensional discrete Fourier transform.
The computer program product of claim 29, where the storage medium may be selected from a group of removable storage medium consisting of a CD-ROM, a CD-R/W, a DVD, a persistent memory, a Flash-memory, a semiconductor memory, or a hard drive memory.
A device for classifying a traffic sign comprising:
- an input configured to receive image data;
- and
- a processing device coupled to the input to receive the image data, the processing device being configured to identify a portion of the image data representing at least a portion of the traffic sign;
- calculate coefficients of a two-dimensional spectral representation of the portion of the image data;
- determine the coefficients of the two-dimensional spectral representation for Fourier space coordinates disposed along a line in Fourier space;
- and
- establish, based on the determined coefficients, whether the traffic sign has the at least one graphical feature extending linearly on the traffic sign.
A driver assistance system for a vehicle comprising:
- a device for recognizing a traffic sign;
- at least one input device electronically coupled to the device for receiving image data representing at least a portion of the traffic sign;
- a vehicle on-board network;
- and
- a user interface,
- where the device is configured to
- identify a portion of image data representing at least a portion of a traffic sign;
- calculate coefficients of a two-dimensional spectral representation of the portion of image data;
- determine the coefficients of the two-dimensional spectral representation for Fourier space coordinates disposed along a line in Fourier space;
- and
- establish, based on the determined coefficients, whether the traffic sign has at least one graphical feature extending linearly on the traffic sign.
Dependencies are inferred from the claim text.